DESCRIPTION
Title of the Invention:
COMPRESSOR AND COMPRESSOR MANUFACTURING METHOD Technical Field
[0001] The present invention relates to a compressor and a compressor manufacturing method. The present invention relates to, for example, a hermetic type motor compressor used in a refrigerating cycle apparatus such as an air conditioner or a refrigerator. Background Art
[0002] As a conventional method for fixing the stator of the motor of a hermetic type motor compressor to a hermetic container, there is a method in which the stator having an outer diameter larger than the inner diameter of the hermetic container is fixed to the hermetic container by shrinkage fit (for example, see Patent Literature 1). [0003] There is also a method in which shrinkage fit is not used for fixing the stator to the hermetic container (for example, see Patent Literature 2). In this method, prepared holes are formed close to each other in the outer circumferential surface of the stator. Each of portions of the hermetic container which opposes corresponding one of the prepared holes is locally heated. Then, the heated portions are pressed by a pressing jig radially inwardly, so that convex portions each of which engages with a corresponding one of the prepared holes are formed in the hermetic container. With thermal contraction due to cooling of the hermetic container, each pair of the convex portions of the hermetic container clamp a portion between a corresponding pair of the prepared holes of the stator, so that the stator is fixed to the hermetic container. Citation List

Patent Literature
[0004] Patent Literature 1: JP 60-159391 A
Patent Literature 2: JP 2007-303379 A Summary of Invention Technical Problem
[0005] With the method of fixing the stator of the motor to the hermetic container by shrinkage fit, it is difficult to control the clamping force acting on the stator. Particularly, the stator, which is formed by laminating electromagnetic steel plates, has low rigidity and accordingly the inner-diameter roundness of the stator degrades. Then, the air gap between the stator and the rotor becomes non-uniform, causing magnetic imbalance sound. Also, the temperature distribution varies when the hermetic container is heated, or the machining strain generated by heating of components is released, causing stress to focus on a specific portion of the stator core and iron loss to occur. This results in a decrease in the motor efficiency.
[0006] Even with the method in which shrinkage fit is not used for fixing the stator to the hermetic container, since the convex portions of the hermetic container squeeze the portion between the prepared holes of the stator, it is likely that a stress focuses on a specific portion of the stator core to cause iron loss and the motor efficiency decreases. Also, with this method, it is necessary to form the prepared holes by machining the outer circumferential surface of the stator with a drill or the like. This machining, however, might degrade the inner-diameter roundness of the stator. As the electromagnetic steel plates of the layers where the prepared holes are to be formed, other electromagnetic steel plates may be prepared which have shapes different from those of the electromagnetic steel plates of the layers where no prepared holes will be formed, and these other electromagnetic steel plates may be combined to form the

prepared holes. In this case, however, an additional cost is required for preparing
different dies. Also, there is a risk of combining different electromagnetic steel plates
erroneously.
[0007] It is, for example, an object of the present invention to suppress a decrease in
motor efficiency of a compressor.
Solution to Problem
[0008] An compressor according to one aspect of the present invention includes:
a motor having a stator with an outer circumferential surface where two concave portions lining up circumferentially are formed at each of a plurality of portions in a circumferential direction, and a notch is formed between the two concave portions;
a container with an inner circumferential surface where two convex portions lining up circumferentially are formed at each of a plurality of portions in a circumferential direction, each of the two convex portions penetrating into a corresponding one of the two concave portions, the two convex portions squeezing a portion where the notch is formed, of the stator, so as to fix the stator to an inside of the container; and
a compressing mechanism accommodated inside the container and being driven by the motor,
wherein a projecting portion is formed in a region between the notch and each of the two concave portions, on the outer circumferential surface of the stator, to project more radially outwardly than other regions on the outer circumferential surface of the stator, the inner circumferential surface of the container being brought into contact with the projecting portion. Advantageous Effects of Invention

[0009] In the present invention, two convex portions formed on a container of a compressor each penetrate into a corresponding one of two concave portions formed in a stator of a motor of the compressor and squeeze a portion between the two concave portions where a notch is formed, so that the stator of the motor is fixed to the inside of the container. The presence of the notch moderates the stress focus that causes the loss. A projecting portion is formed in a region between the notch and each of the two concave portions, on the outer circumferential surface of the stator, to project more radially outwardly than the other regions on the outer circumferential surface of the stator. The entire outer circumferential surface of the stator is not brought into contact with the inner circumferential surface of the container. Instead, the projecting portion is brought into contact with the inner circumferential surface of the container, thereby improving the the inner-diameter roundness of the stator. Therefore, according to the present invention, a decrease in motor efficiency can be suppressed. Brief Description of Drawings
[0010] Fig. 1 is a circuit diagram of a refrigerating cycle apparatus according to Embodiment 1.
Fig. 2 is a circuit diagram of the refrigerating cycle apparatus according to Embodiment 1.
Fig. 3 is a longitudinal sectional view of a compressor according to Embodiment 1.
Fig. 4 is a sectional view taken along the line A-A of Fig. 3.
Fig. 5 is a perspective view of a stator core of a stator of a motor according to Embodiment 1.
Fig. 6 is a plan view of the stator core of the stator of the motor according to Embodiment 1.

Fig. 7 is a partial perspective view of a hermetic container according to Embodiment 1.
Fig. 8 is a cross-sectional view of the hermetic container according to Embodiment 1.
Fig. 9 is a plan view of a split core of the stator of the motor according to Embodiment 1.
Fig. 10 is a partial sectional view of the stator of the motor and the hermetic container according to Embodiment 1.
Fig. 11 is a partial sectional view of the stator of the motor and the hermetic container according to Embodiment 1.
Fig. 12 is a partial sectional view of the stator of the motor and the hermetic container according to Embodiment 1.
Fig. 13 is a view seen from the direction of an arrow E of Fig. 12. Description of Embodiments
[0011] A preferred embodiment of the present invention will now be described with reference to the accompanying drawings. The same or equivalent portions are denoted by the same reference numerals throughout the drawings, and their explanations will be suitably omitted or simplified in the description of the embodiment. In the description of the embodiment, positions, directions, and so on are expressed as "upper", "lower", "left", "right", "front", "behind", "top", "bottom", and so on. It must be noted that these expressions are employed only for the sake of explanatory conveniences and will not limit the actual positions, directions, and so on of devices, instruments, components, and so on. Concerning the configurations of the devices, instruments, components, and so on, their materials, shapes, sizes, and so on can be appropriately changed within the scope of the present invention.

[0012] Embodiment 1.
Figs. 1 and 2 are circuit diagrams of a refrigerating cycle apparatus 10 according to this embodiment. Fig. 1 illustrates a refrigerant circuit 1 la in a cooling operation, and Fig. 2 illustrates a refrigerant circuit 1 lb in a heating operation. [0013] In this embodiment, the refrigerating cycle apparatus 10 is an air conditioner. This embodiment can also be applied if the refrigerating cycle apparatus 10 is an appliance other than an air conditioner, such as a refrigerator or a heat pump cycle apparatus.
[0014] As illustrated in Figs. 1 and 2, the refrigerating cycle apparatus 10 includes the refrigerant circuit 11 a or 1 lb in which a refrigerant circulates. [0015] A compressor 12, a four-way valve 13, an outdoor heat exchanger 14, an expansion valve 15, and an indoor heat exchanger 16 are connected to the refrigerant circuit 1 la or lib. The compressor 12 compresses the refrigerant. The four-way valve 13 switches between the flowing directions of the refrigerant in the cooling operation and in the heating operation. The outdoor heat exchanger 14 is an example of a first heat exchanger. In the cooling operation, the outdoor heat exchanger 14 operates as a condenser to dissipate heat of the refrigerant compressed by the compressor 12. In the heating operation, the outdoor heat exchanger 14 operates as an evaporator to heat the refrigerant by exchanging heat between outdoor air and the refrigerant expanded at the expansion valve 15. The expansion valve 15 is an example of an expansion mechanism. The expansion valve 15 expands the refrigerant heat of which has been dissipated at the condenser. The indoor heat exchanger 16 is an example of a second heat exchanger. In the heating operation, the indoor heat exchanger 16 operates as a condenser to dissipate heat of the refrigerant compressed by the compressor 12. In the cooling operation, the indoor heat exchanger 16 operates as

an evaporator to heat the refrigerant by exchanging heat between indoor air and the
refrigerant expanded at the expansion valve 15.
[0016] The refrigerating cycle apparatus 10 further includes a control device 17.
[0017] The control device 17 is, for example, a microcomputer. Although Figs. 1
and 2 illustrate only a connection between the control device 17 and the compressor 12,
the control device 17 is connected not only to the compressor 12 but also to each
element connected to the refrigerant circuit 1 la or 1 lb. The control device 17
monitors and controls the state of each element.
[0018] As the refrigerant circulating in the refrigerant circuit 1 la or 1 lb, an arbitrary
refrigerant such as an R407C refrigerant, an R410A refrigerant, or an R1234yf
refrigerant can be used.
[0019] Fig. 3 is a longitudinal sectional view of the compressor 12. Fig. 4 is a
sectional view taken along the line A-A of Fig. 3. In Figs. 3 and 4, hatching that
expresses a section is omitted. Fig. 4 illustrates only the inside of a hermetic container
20.
[0020] In this embodiment, the compressor 12 is a single-cylinder rotary compressor.
This embodiment can also be applied if the compressor 12 is a multi-cylinder rotary
compressor or a scroli compressor.
[0021] As illustrated in Fig. 3, the compressor 12 includes the hermetic container 20,
a compressing mechanism 30, a motor 40, and a crank shaft 50.
[0022] The hermetic container 20 is an example of a container. An intake pipe 21 to
suck the refrigerant and a discharge pipe 22 to discharge the refrigerant are attached to
the hermetic container 20.
[0023] The compressing mechanism 30 is accommodated inside the hermetic
container 20. More specifically, the compressing mechanism 30 is placed at a lower

portion of the inside of the hermetic container 20. The compressing mechanism 30 is driven by the motor 40. The compressing mechanism 30 compresses the refrigerant sucked into the intake pipe 21.
[0024] The motor 40 is also accommodated inside the hermetic container 20. More specifically, the motor 40 is placed, inside the hermetic container 20, at a position where the refrigerant compressed by the compressing mechanism 30 passes before being discharged from the discharge pipe 22. That is, the motor 40 is placed above the compressing mechanism 30 inside the hermetic container 20. The motor 40 is a concentrated-winding motor. This embodiment can also be applied if the motor 40 is a distributed-winding motor.
[0025] Refrigerating machine oil 25 for lubricating the slide portions of the compressing mechanism 30 is reserved at the bottom portion of the hermetic container 20. Along with the rotation of the crank shaft 50, the refrigerating machine oil 25 is pumped up by an oil pump provided at the lower portion of the crank shaft 50 and is supplied to the slide portions of the compressing mechanism 30. As the refrigerating ■ machine oil 25, for example, POE (polyol ester), PVE (polyvinyl ether), or AB (alkyl benzene), each being synthetic oil, is used.
[0026] The compressing mechanism 30 will be described in detail hereinbelow. [0027] As illustrated in Figs. 3 and 4, the compressing mechanism 30 includes a cylinder 31, a rolling piston 32, a vane 36, a main bearing 33, and a sub-bearing 34. [0028] The outer circumference of the cylinder 31 has a substantially circular shape in a plan view. A cylinder chamber 62 being a space that has a substantially circular shape in a plan view is formed in the cylinder 31. Both axial ends of the cylinder 31 are open. [0029] A vane groove 61 is formed in the cylinder 31 to communicate with the

cylinder chamber 62 and extend radially. A back-pressure chamber 63, being a space that has a substantially circular shape in a plan view and communicates with the vane groove 61, is formed at the outer side of the vane groove 61. [0030] Although not illustrated, the cylinder 31 is provided with an inlet port into which the gas refrigerant is sucked from the refrigerant circuit 11a or lib. The inlet port extends from the outer circumferential surface of the cylinder 31 to penetrate into the cylinder chamber 62.
[0031 ] Although not illustrated, the cylinder 31 is provided with a discharge port through which the compressed refrigerant from the cylinder chamber 62 is discharged. The discharge port is formed by notching the upper end face of the cylinder 31. [0032] The rolling piston 32 has a ring-like shape. The rolling piston 32 eccentrically moves in the cylinder chamber 62. The rolling piston 32 slidably fits on an eccentric shaft portion 51 of the crank shaft 50.
[0033] The vane 36 has a flat and substantially rectangular parallelepiped shape. The vane 36 is placed in the vane groove 61 of the cylinder 31. The vane 36 is constantly pressed against the rolling piston 32 by a vane spring 37 provided in the back-pressure chamber 63. Because of high pressure inside the hermetic container 20, when the compressor 12 starts operation, force due to the difference between the pressure in the hermetic container 20 and the pressure in the cylinder chamber 62 acts on the vane rear surface, being a surface of the vane 36 at the side of the back-pressure chamber 63. Therefore, the vane spring 37 is mainly used for pressing the vane 36 against the rolling piston 32 at the start-up of the compressor 12, which is when there is no difference between the pressure in the hermetic container 20 and the pressure in the cylinder chamber 62. [0034] The main bearing 33 has a substantially inverted T-shape in a side view. The

main bearing 33 slidably fits on a main shaft portion 52 being a portion above the eccentric shaft portion 51, of the crank shaft 50. The main bearing 33 closes the upper side of the cylinder chamber 62 of the cylinder 31 and the upper side of the vane groove 61 of the cylinder 31.
[0035] The sub-bearing 34 has a substantially T-shape in a side view. The sub-bearing 34 slidably fits on a sub-shaft portion 53 being a portion below the eccentric shaft portion 51, of the crank shaft 50. The sub-bearing 34 closes the lower side of the cylinder chamber 62 of the cylinder 31 and the lower side of the vane groove 61 of the cylinder 31.
[0036] Although not illustrated, the main bearing 33 includes a discharge valve. A discharge muffler is attached to the outer side of the main bearing 33. The high-temperature and high-pressure gas refrigerant discharged through the discharge valve temporarily enters the discharge muffler 35 and is then emitted from the discharge muffler 35 to the space in the hermetic container 20. The discharge valve and the discharge muffler 35 may be provided to the sub-bearing 34, or both of the main bearing 33 and the sub-bearing 34.
[0037] The cylinder 31, main bearing 33, and sub-bearing 34 are made of gray cast iron, sintered steel, carbon steel, or the like. The rolling piston 32 is made of, for example, alloy steel containing chrome or the like. The vane 36 is made of, for example, high-speed tool steel.
[0038] An intake muffler 23 is provided beside the hermetic container 20. The intake muffler 23 sucks the low-pressure gas refrigerant from the refrigerant circuit 1 la or lib. The intake muffler 23 suppresses direct entry of the liquid refrigerant into the cylinder chamber 62 of the cylinder 31 when the liquid refrigerant returns. The intake muffler 23 is connected to the intake port of the cylinder 31 through the intake pipe 21.

The main body of the intake muffler 23 is fixed to the side surface of the hermetic
container 20 by welding or the like.
[0039] The motor 40 will be described in detail hereinbelow.
[0040] In this embodiment, the motor 40 is a brushless DC (direct current) motor.
This embodiment can also be applied if the motor 40 is a motor other than a brushless
DC motor, such as an induction motor.
[0041] As illustrated in Fig. 3, the motor 40 includes a substantially cylindrical stator
41 and a substantially columnar rotor 42.
[0042] The stator 41 is fixed in contact with the inner circumferential surface of the
hermetic container 20. The rotor 42 is placed inside of and spaced approximately 0.3
to 1 mm apart from the stator 41.
[0043] The stator 41 includes a stator core 43 and a winding 44. The stator core 43
is fabricated by punching out each of electromagnetic steel plates, which contains iron
as a major component and has a thickness of 0.1 to 1.5 mm, into a certain shape,
laminating the punched-out electromagnetic steel plates axially, and fixing the
laminated electromagnetic steel plates by caulking, welding, or the like. The winding
44 is wound around the stator core 43 via an insulating member 47 by concentrated
winding. The winding 44 includes a core wire and at least one-layer film covering the
core wire. The core wire is made of, for example, copper. The film is made of, for
example, Al (amide-imide)/EI (ester-imide). The insulating member 47 is made of, for
example, PET (polyethylene terephthalate), PBT (polybutylene terephthalate), FEP
(tetrafluoroethylene-hexafluoropropylene copolymer), PFA
(tetrafluoroethylene-perfluoroalkyl vinyl ether copolymer), PTFE
(polytetrafluoroethylene), LCP (liquid-crystal polymer), PPS (polyphenylene sulfide),
or phenol resin. Lead wires 45 are connected to the winding 44.

[0044] The rotor 42 includes a rotor core 46 and permanent magnets (not illustrated). As with the stator core 43, the rotor core 46 is fabricated by punching out each of electromagnetic steel plates, which contains iron as a major component and has a thickness of 0.1 to 1.5 mm, into a certain shape, laminating the punched-out electromagnetic steel plates axially, and fixing the laminated electromagnetic steel plates by caulking, welding, or the like. Each permanent magnet is inserted in a corresponding one of insertion holes formed in the rotor core 46. Each permanent magnet forms a magnetic pole. As each permanent magnet, for example, a ferrite magnet or a rare-earth magnet is used.
[0045] An upper end plate 48 and lower end plate 49 are respectively provided to the rotor upper end and rotor lower end which are the two axial ends of the rotor 42, so that the permanent magnets do not fall out axially. The upper end plate 48 and lower end plate 49 each doubles as a rotation balancer. The upper end plate 48 and lower end plate 49 are fixed to the rotor core 46 with fixing rivets (not illustrated) or the like. [0046] Although not illustrated, a shaft hole is formed at the center of the rotor core 46 in a plan view. The main shaft portion 52 of the crank shaft 50 is fitted into the shaft hole by shrinkage fit, or pressed into the shaft hole. Through holes are formed around the shaft hole of the rotor core 46 to extend substantially axially. Each through hole forms one of the passages for the gas refrigerant which is to be emitted from the discharge muffler 35 to the space in the hermetic container 20.
[0047] Although not illustrated, if the motor 40 is formed as an induction motor, each of conductors made of aluminum, copper, or the like fills or is inserted in a corresponding one of slots formed in the rotor core 46. A squirrel cage winding, wherein each of the two ends of the conductors is short-circuited with a corresponding one of end rings, is formed.

[0048] A terminal 24 connected to an externai power supply such as an inverter device is attached to the top portion of the hermetic container 20. The terminal 24 is, for example, a glass terminal. The terminal 24 is fixed to the hermetic container 20 by. for example, welding. The lead wires 45 extending from the motor 40 are connected to the terminal 24.
[0049] The discharge pipe 22 is attached to the top portion of the hermetic container 20. The two axial ends of the discharge pipe 22 are open. The gas refrigerant which has been discharged from the compressing mechanism 30 is discharged from the space in the hermetic container 20 through the discharge pipe 22 to the external refrigerant circuit 11a or lib.
[0050] Although will be described later in detail, concave portions 72 are formed in the outer circumferential surface 71 of the stator 41 of the motor 40. Convex portions 82 are formed on the inner circumferential surface 81 of the hermetic container 20. Each of the convex portions 82 penetrates into a corresponding one of the concave portions 72 in order to fix the stator 41 of the motor 40 to the inside of the hermetic container 20.
[0051] The operation of the compressor 12 will be described hereinbelow. [0052] Power is supplied from the terminal 24 to the stator 41 of the motor 40 via the lead wires 45. Current thereby flows through the winding 44 of the stator 41, and magnetic flux is generated from the winding 44. The rotor 42 of the motor 40 rotates by the action of the magnetic flux generated from the winding 44 and the magnetic flux generated from the permanent magnets of the rotor 42. The rotation of the rotor 42 causes the crank shaft 50, which is fixed to the rotor 42, to rotate. Along with the rotation of the crank shaft 50, the rolling piston 32 of the compressing mechanism 30 eccentrically rotates in the cylinder chamber 62 of the cylinder 31 of the compressing

mechanism 30. The space between the cylinder 31 and the rolling piston 32 is divided into two spaces by the vane 36 of the compressing mechanism 30. Along with the rotation of the crank shaft 50, the volumes of the two spaces change. In one of the two spaces, as the volume gradually enlarges, the low-pressure gas refrigerant is sucked from the intake muffler 23. In the other of the two spaces, as the volume gradually reduces, the gas refrigerant inside is compressed. The compressed gas refrigerant, the pressure and temperature of which have become high, is discharged from the discharge muffler 35 to the space in the hermetic container 20. The discharged gas refrigerant further passes through the motor 40 and is discharged from the discharge pipe 22 at the top portion of the hermetic container 20 to the outside of the hermetic container 20. The refrigerant discharged to the outside of the hermetic container 20 passes through the refrigerant circuit 1 la or 1 lb to return again to the intake muffler 23. [0053] Although not illustrated, if the compressor 12 is formed as a swing-type rotary compressor, the vane 36 is formed integrally with the rolling piston 32. When the crank shaft 50 is driven, the vane 36 projects and retracts along the accepting groove in a support body rotatably attached to the rolling piston 32. Along with the rotation of the rolling piston 32, the vane 36 moves forward and backward radially while swinging, to partition the interior of the cylinder chamber 62 into a compression chamber and a suction chamber. The support body is formed of two columnar members each having a semicircular cross section. The support body is rotatably fitted in a circular holding hole formed at an intermediate portion between the inlet port and discharge port of the cylinder 31.
[0054] The configuration for fixing the stator 41 of the motor 40 to the inside of the hermetic container 20, a procedure for implementing this configuration, and an effect obtained by this configuration will be described sequentially hercinbelow.

[0055] *** Description of Configuration ***
The configuration of the stator core 43 of the stator 41 of the motor 40 and the configuration of the hermetic container 20 will be described hereinbelow. [0056] Fig. 5 is a perspective view of the stator core 43 of the stator 41 of the motor 40. Fig. 6 is a plan view of the stator core 43 of the stator 41 of the motor 40. [0057] As illustrated in Figs. 5 and 6, in this embodiment, the two concave portions 72 lining up circumferentially are formed at each of a plurality of portions in the circumferential direction of the outer circumferential surface 71 of the stator core 43. A notch 73 is formed between the two concave portions 72. The outer circumferential surface 71 of the stator core 43 corresponds to the outer circumferential surface of the stator 41 of the motor 40.
[0058] Each concave portion 72 extends axially to form a groove. [0059] Each notch 73 serves as another one of the passages for the gas refrigerant which is to be emitted from the discharge muffler 35 to the space in the hermetic container 20. Each notch 73 also serves as a passage for the refrigerating machine oil 25 returning to the bottom portion of the hermetic container 20 from above the motor 40.
[0060] A plurality of split cores 74 are linked circumferentially to constitute the stator core 43. That is, in this embodiment, the stator 41 of the motor 40 has the split cores 74 linked to each other circumferentially to form the stator core 43. Each split core 74 has a tooth 75. The tooth 75 has a shape extending radially inwardly with a constant width from the base, and increasing in width at the distal end. The winding 44 is wound around the portion extending with the constant width, of the tooth 75. When current flows in the winding 44, the tooth 75 around which the winding 44 is wound serves as a magnetic poic. The direction of the magnetic pole is determined by the

direction of the current flowing in the winding 44.
[0061] Figs. 5 and 6 illustrate, as an example, the stator core 43 having the two concave portions 72 and the notch 73 formed at each of nine portions in the circumferential direction of the outer circumferential surface 71. The number of portions at each of which the two concave portions 72 and the notch 73 are formed can be changed as required. In order to securely fix the stator 41 of the motor 40 to the inside of the hermetic container 20, it is desirable that the two concave portions 72 and the notch 73 are formed at each of three or more portions in the circumferential direction of the outer circumferential surface 71.
[0062] Illustrated as an example is a configuration in which, for every two concave portions 72, one notch 73 is formed between the two concave portions 72. An alternative configuration may be employed in which, for every two concave portions 72, two or more notches 73 are formed between the two concave portions 72. [0063] Illustrated as an example is the stator core 43 in which nine teeth 75 are formed. The number of teeth 75 can be appropriately changed. [0064] Illustrated as an example is the stator core 43 constituted by the split cores 74. Alternatively, a one-piece stator core 43 may be employed.
[0065] Illustrated as an example is a configuration in which the two concave portions 72 and the notch 73 are formed in each of all the teeth 75 or in each of all the split cores 74. Alternatively, the two concave portions 72 and the notch 73 may be formed in each of only some of the teeth 75, or in each of only some of the split cores 74. In the case where the two concave portions 72 and the notch 73 are formed in each of all the split cores 74, the uniformity of the shapes of the split cores 74 enables cost reduction in comparison with the case where the two concave portions 72 and the notch 73 are formed in each of only some of the split cores 74.

[0066] Illustrated as an example is a configuration in which each concave portion 72 extends entirely axially to form a groove. An alternative configuration may be employed in which each concave portion 72 extends only partly axially, that is, each concave portion 72 is formed as a hole. In the case where each concave portion 72 extends entirely axially to form a groove, the uniformity of the shapes of the laminated electromagnetic steel plates enables cost reduction or avoidance of the risk of erroneously combining different electromagnetic steel plates, in comparison with the case where each concave portion 72 is formed as a hole.
[0067] As illustrated in Figs. 5 and 6, every two concave portions 72 that are close are provided in a pair. In the following description, a partial region constituted by combining the two concave portions 72 and a portion sandwiched by the two concave portions 72, of the outer circumferential surface 71 of the stator core 43 will be called a fixing portion 76. In this embodiment, nine fixing portions 76 are formed almost equidistantly in the outer circumferential surface 71 of the stator core 43. Hence, there are a total of 18 concave portions 72. Of the 18 concave portions 72, six concave portions 72 are used to fix the stator 41 of the motor 40 to the inside of the hermetic container 20.
[0068] Fig. 7 is a partial perspective view of the hermetic container 20. Fig. 8 is a cross-sectional view of the hermetic container 20. Fig. 7 presents only a part in the axial direction of the hermetic container 20. The axial direction of the hermetic container 20 is the height direction of the hermetic container 20. The axial direction of the hermetic container 20 is parallel to the axial direction of the stator 41 of the motor 40.
[0069] As illustrated in Figs. 7 and 8, in this embodiment, the two convex portions 82 lining up circumferentially are formed at each of a plurality of portions in the

circumferential direction of the inner circumferential surface 81 of the hermetic container 20. Each of the two convex portions 82 penetrates into a corresponding one of the two concave portions 72 illustrated in Figs. 5 and 6, and the two convex portions 82 squeeze the portion in which the notch 73 is formed, of the stator 41 of the motor 40, so as to fix the stator 41 of the motor 40 to the inside of the hermetic container 20. [0070] In the outer circumferential surface 83 of the hermetic container 20, each of machining holes 84 is formed at a position opposing a corresponding one of the convex portions 82, as a result of pushing the outer circumferential surface 83 inward in order to form the corresponding one of the convex portions 82 on the inner circumferential surface 81.
[0071] As an example, Figs. 7 and 8 illustrate the hermetic container 20 having the two convex portions 82 which are formed at each of three portions in the circumferential direction of the inner circumferential surface 81. The portions where the two convex portions 82 are formed can be changed as required. In order to securely fix the stator 41 of the motor 40 to the inside of the hermetic container 20, it is desirable that the two convex portions 82 are formed at each of three or more portions in the circumferential direction of the outer circumferential surface 71. [0072] As illustrated in Figs. 7 and 8, every two convex portions 82 that are close are provided in a pair. The convex portions 82 are formed, when the stator 41 of the motor 40 is placed inside the hermetic container 20, by pushing the outer circumferential surface 83 of the hermetic container 20 inward, as will be described later. The two convex portions 82 in a pair penetrate into the two concave portions 72 in a pair, thus forming two caulking points. In the following description, a partial region constituted by combining the two convex portions 82 that form the caulking points, of the inner circumferential surface 81 of the hermetic container 20 will be

called a caulking portion 85. In this embodiment, three caulking portions 85 are formed almost equidistantly on the inner circumferential surface 81 and outer circumferential surface 83 of the hermetic container 20. Hence, there are a total of six convex portions 82.
[0073] Fig. 9 is a plan view of a split core 74 of the stator 41 of the motor 40. [0074] As described earlier, in this embodiment, at the plurality of portions of the stator 41 of the motor 40 and the plurality of corresponding portions of the hermetic container 20, each of the two convex portions 82 penetrates into the corresponding one of the two concave portions 72, and the two convex portions 82 squeeze the portion in which the notch 73 is formed, of the stator 41 of the motor 40, so as to fix the stator 41 of the motor 40 to the inside of the hermetic container 20. If there is no notch 73, the two convex portions 82 clamp the portion between the two concave portions 72, causing stress to converge on portions indicated by B in Fig. 9, that is, the radially inner end portions of the joints of the split core 74. Essentially, the portions B are where the magnetic flux from the magnetic pole formed in the tooth 75 flows. Thus, if the stress converges on the portions B, hysteresis loss occurs. Hysteresis loss is a phenomenon where magnetic resistance increases at a portion where stress converges, causing the magnetic flux not to flow easily at this portion and loss to occur. The hysteresis loss is so-called iron loss and is a factor to decrease the motor efficiency. In this embodiment, because of the notch 73 between the two concave portions 72, the stress can be made ;onverge on portions indicated by C in Fig. 9, that is, the radially inner corner portions )f the notch 73. The portions C are located away from the flow channel of the nagnetic flux from the magnetic pole. Hence, even if the stress converges on the portions C, the hysteresis loss does not occur easily. Moreover, if the stress converges )n the portions C, the stress acting on the portions B can be decreased greatly. As a

result, occurrence of the iron loss is avoided and a decrease in the motor efficiency can be suppressed.
[0075] As illustrated in Fig. 9, in this embodiment, a projecting portion 77 is formed in a region between the notch 73 and each of the two concave portions 72, on the outer circumferential surface 71 of each of the split cores 74 that constitute the stator core 43. The projecting portion 77 projects more radially outwardly than the other regions on the outer circumferential surface 71 of each of the split cores 74. Since the inner circumferential surface 81 of the hermetic container 20 is brought into contact with the projecting portion 77, the stator 41 of the motor 40 can be fixed to the inside of the hermetic container 20 more securely. In addition, since the projecting portion 77, instead of the entire outer circumferential surface 71 of the stator 41, is brought into contact with the inner circumferential surface 81 of the hermetic container 20, the inner-diameter roundness of the stator 41 improves. That is, in this embodiment, since the two convex portions 82 formed on the hermetic container 20 squeeze the portion in which the notch 73 is formed, of the stator 41, even if the clamping force from the hermetic container 20 to act on the stator 41 is low, the stator 41 can be fixed to the inside of the hermetic container 20. Hence, while the inner circumferential surface 81 of the hermetic container 20 and the outer circumferential surface 71 of the stator 41 are kept in contact with each other, the contact region of the inner circumferential surface 81 and the outer circumferential surface 71 can be reduced, so that secure fixing of the stator 41 and improvement in the inner-diameter roundness of the stator 41 are compatible. Since the region on the outer circumferential surface 71 of the stator 41 that is brought into contact with the inner circumferential surface 81 of the hermetic container 20 is limited to the projecting portion 77, the contact region can be reduced. [0076] In this embodiment, the region between the notch 73 and each of the two

concave portions 72, on the outer circumferential surface 71 of each of the split cores 74 that constitute the stator core 43 is divided into a non-contact region 78 and a contact region 79. The non-contact region 78 is connected to the notch 73 and has no projecting portion 77 formed therein. The contact region 79 is connected to either one of the two concave portions 72 and has the projecting portion 77 formed therein. The positional relation between the non-contact region 78 and the contact region 79 may be reversed. If the non-contact region 78 is located on the concave portion 72 side, each of the convex portions 82 does not penetrate into the corresponding one of the concave portions 72 up to its base. Therefore, in order to increase the clamping force exerted by the convex portions 82, the contact region 79 is desirably provided on the concave portion 72 side. The area ratio of the non-contact region 78 to the contact region 79 can be set arbitrarily. However, the area of the contact region 79 is desirably smaller than the area of the non-contact region 78. That is, on the outer circumferential surface 71 of one split core 74, the percentage of the contact region 79 in each region between the notch 73 and each of the two concave portions 72 is desirably lower than 50%.
[0077] The percentage of the contact regions 79 on the entire outer circumferential surface 71 of the stator 41 is desirably 30% or less. In this embodiment, the angle of the split core 74 to the angle of the stator core 43 as a whole is 360° / 9 = 40°. Hence, if the angle of the contact region 79 included in the region between the notch 73 and one concave portion 72 of the outer circumferential surface 71 of one split core 74 is not more than 40° x 0.3 / 2 = 6°, then the percentage of the contact regions 79 on the entire outer circumferential surface 71 of the stator 41 will be not more than 30% (= 6° x 2 x 9 1 360° x 100). For the sake of fixing the stator 41 more firmly, the percentage of the contact regions 79 on the entire outer circumferential surface 71 of the stator 41 is

desirably not less than 1%. In this embodiment, if the angle of the contact region 79 included in the region between the notch 73 and one concave portion 72 of the outer circumferential surface 71 of one split core 74 is not less than 40° x 0.01 / 2 - 0.2°, then the percentage of the contact regions 79 on the entire outer circumferential surface 71 of the stator 41 will be not less than 1% (= 0.2° x 2 x 9 / 360° x 100). To surely achieve both reliable fixing of the stator 41 and the increase in inner-diameter roundness of the stator 41, the percentage of the contact regions 79 on the entire outer circumferential surface 71 of the stator 41 is most desirably 3 to 15%. In this embodiment, if the angle of the contact region 79 included in the region between the notch 73 and one concave portion 72 of the outer circumferential surface 71 of one split core 74 is not less than 40° x 0.03/2-0.6° and not more than 40° x 0.15 /2 = 3°, then the percentage of the contact regions 79 on the entire outer circumferential surface 71 of the stator 41 will be 3 to 15%. For the sake of simple explanation, it is assumed that the axial length of the stator core 43 is uniform, and if the "angle" is N times, the "area" corresponding to the "percentage" will also be N times. The "angle" may be regarded as the length in the circumferential direction.
[0078] The length by which one projecting portion 77 projects from the outer circumferential surface 71 of the stator 41 may be arbitrary. The length by which one projecting portion 77 projects from the outer circumferential surface 71 of the stator 41 signifies, when one non-contact region 78 is considered, the length by which a contact region 79 adjacent to this non-contact region 78 projects in the radial direction of the stator core 43, and is the dimension indicated by P in Fig. 9.
[0079] In this embodiment, since the stator 41 of the motor 40 is fitted inside the hermetic container 20 by shrinkage fit, the inner circumferential surface 81 of the hermetic container 20 is brought into contact with the projecting portion 77. If the

stator 41 of the motor 40 is to be fixed to the inside of the hermetic container 20 by only shrinkage fit, the inner-diameter roundness of the stator core 43 may degrade, and accordingly the air gap between the stator 41 and rotor 42 may become non-uniform, producing magnetic imbalance sound. However, in this embodiment, at the plurality of portions of the stator 41 of the motor 40 and the plurality of corresponding portions of the hermetic container 20, each of the two convex portions 82 penetrates into the corresponding one of the two concave portions 72, and the two convex portions 82 squeeze the portion in which the notch 73 is formed, of the stator 41 of the motor 40. Therefore, the degree of fixing attained by shrinkage fit can be decreased. That is, on the outer circumferential surface 71 of the stator core 43, the portion to be clamped by shrinkage fit can be limited to only the contact region 79. Assume that a configuration is employed in which there is no non-contact region 78, and the entire region between the notch 73 and each of the two concave portions 72, in the outer circumferential surface 71 of each of the split cores 74 is brought into contact with the inner circumferential surface 81 of the hermetic container 20. Even then, the area of the portion clamped by shrinkage fit can be set to be smaller than in a configuration in which the stator 41 of the motor 40 is fixed to the inside of the hermetic container 20 by only shrinkage fit. As a result, the inner-diameter roundness of the stator core 43 can be improved, and the magnetic imbalance sound may be suppressed. Note that the stator 41 of the motor 40 may be fitted to the inside of the hermetic container 20 by cooling fit.
[0080] In this embodiment, the two concave portions 72 are arranged separately on the two sides of the center position in the circumferential direction of each of the plurality of split cores 74. In Fig. 9, a center line representing the center position in the circumferential direction of the split core 74 is indicated by an alternate long and

short dashed line D.
[0081] *** Description of Procedure ***
A compressor manufacturing method, being the method of manufacturing the compressor 12, according to this embodiment includes the following steps.
• Accommodating step: This is a step of accommodating the compressing mechanism 30 to the inside of the hermetic container 20.
• Placing step: This is a step of placing the stator 41 of the motor 40 to the inside of the hermetic container 20.
• Machining step: This is a step of heating the plurality of portions in the circumferential direction of the inner circumferential surface 81 of the hermetic container 20 and machining the plurality of heated portions, to form the two convex portions 82 each of which penetrates into the corresponding one of the two concave portions 72.
• Fixing step: This is a step of causing the two convex portions 82 to contract thermally, so that the two convex portions 82 squeeze the portion where the notch 73 is formed, of the stator 41 of the motor 40, thereby fixing the stator 41 of the motor 40 to the inside of the hermetic container 20.
[0082] The four steps described above are practiced in the order of the
accommodating step, placing step, machining step, and fixing step.
[0083] The machining step and the fixing step will now be described.
[0084] Figs. 10, 11, and 12 are partial sectional views of the stator 41 of the motor 40
and the hermetic container 20 in the respective steps for fixing the stator 41 of the motor
40 to the inside of the hermetic container 20.
[0085] In the machining step, as illustrated in Fig. 10, each portion on the outer
circumferential surface 83 of the hermetic container 20, which opposes a corresponding

one of the fixing portions 76 of the hermetic container 20, the portion including a certain range centered around a position corresponding to the center position between the two concave portions 72 of the corresponding one of the fixing portions 76, is locally heated from the outside of the hermetic container 20. After the hermetic container 20 is thermally expanded by heating, the pressing jig 91 is pressed straight toward the two concave portions 72 from the outside of the hermetic container 20, as illustrated in Fig. 11. More specifically, of the pressing jig 91, two distal end portions 92 each having a width slightly smaller than the width of a corresponding one of the concave portions 72 and having an end face being a square flat surface, are pressed toward the two concave portions 72 simultaneously. Then, as illustrated in Fig. 12, machining holes 84 each having a width equal to that of a corresponding one of the distal end portions 92 of the pressing jig 91 are formed in the outer circumferential surface 83 of the hermetic container 20. Each of the two convex portions 82 that penetrates into the corresponding one of the two concave portions 72 is formed on the inner circumferential surface 81 of the hermetic container 20. That is, the caulking portion 85 having the two caulking points is formed. The pressing jig 91 is individually used for each of three fixing portions 76. That is, three pressing jigs 91 are used to form three caulking portions 85. The three caulking portions 85 are formed by pressing the three pressing jigs 91 against the three portions on the outer circumferential surface 71 of the statorcore 43 almost simultaneously. [0086] In the fixing step, the thermally expanded hermetic container 20 cools down, as illustrated in Fig. 12. When the hermetic container 20 cools down, the two convex portions 82 are drawn toward the center of the heated range by thermal contraction. Hence, the two concave portions 72 close to each other of the fixing portion 76 are clamped circumferentially by the two convex portions 82. As a result, the stator 41 of

the motor 40 including the stator core 43 is fixed to the hermetic container 20. Whereas the stator 41 of the motor 40 is fixed by the radial force in the conventional fixing method employing shrinkage fit, the stator 41 of the motor 40 is fixed by the circumferential force. Hence, the strain applied to the stator core 43 can be reduced. [0087] Fig. 13 is a view seen from the direction of the arrow E of Fig. 12. That is, Fig. 13 is a diagram illustrating the outer circumferential surface 83 of the hermetic container 20 seen from the direction E indicated in Fig. 12.
[0088] As illustrated in Fig. 13, in the machining step, the hermetic container 20 is heated locally, and the hermetic container 20 is softened within, for example, a circular heating range 93 due to the heat. When the two distal end portions 92 of the pressing jig 91 are pressed against the heating range 93, the two machining holes 84 close to each other are formed in the outer circumferential surface 83 of the hermetic container 20. The two convex portions 82 are formed at corresponding positions of the inner circumferential surface 81 of the hermetic container 20. In the fixing step, the hermetic container 20 cools down, and the two convex portions 82 are drawn toward the heating center 94. [0089] *** Description of Effects ***
The effects provided by this embodiment will now be described. [0090] In this embodiment, the two convex portions 82 formed on the hermetic container 20 of the compressor 12 penetrate into the two concave portions 72 formed in the stator 41 of the motor 40 of the compressor 12, and squeeze the portion between the two concave portions 72, where the notch 73 is formed, so that the stator 41 of the motor 40 is fixed to the inside of the hermetic container 20. The presence of the notch 73 moderates stress convergence that causes loss. Also, the projecting portion 77 is formed in the region between the notch 73 and each of the two concave portions 72, on

the outer circumferential surface 71 of the stator 41, to project more radially outwardly than the other regions on the outer circumferential surface 71 of the stator 41. The entire outer circumferential surface 71 of the stator 41 is not brought into contact with the inner circumferential surface 81 of the hermetic container 20. Instead, the projecting portion 77 is brought into contact with the inner circumferential surface 81 of the hermetic container 20, Thus, the inner-diameter roundness of the stator 41 improves. Therefore, according to this embodiment, a decrease in the motor efficiency can be suppressed.
[0091] According to this embodiment, since occurrence of iron loss in the stator 41 of the motor 40 and degradation of the inner-diameter roundness of the stator 41 of the motor 40 can be minimized, a hermetic type motor compressor which has high motor efficiency and produces less noise can be obtained. A highly reliable hermetic type motor compressor having high electrical efficiency can be provided in which, even in a long-term use, defects such as increase in noise or vibration due to backlash of the stator 41 of the motor 40 will not occur and iron loss due to stress convergence in the stator 41 is decreased.
[0092] According to this embodiment, the two convex portions 82 close to each other, of the hermetic container 20 generate sufficiently large squeezing force between the two concave portions 72 of the stator 41 of the motor 40. Accordingly, the stator 41 of the motor 40 can be firmly fixed to the hermetic container 20. A highly reliable compressor 12 can be obtained which, even in a long-term use of the hermetic type motor compressor, withstands normal and excessive force generated during operation and in which defects such as increase in noise or vibration due to the backlash of the stator 41 of the motor 40 will not occur. Also, since the force acting on the stator 41 of the motor 40 is reduced and iron loss due to stress convergence can be suppressed, the

performance improves.
[0093] The material of the hermetic container 20 is generally iron. The yield point of iron sharply decreases at around 600°C. The temperature at which the yield point starts decreasing sharply will be referred to as softening temperature hereinafter. In order to lower the yield point of the material of the hermetic container 20 and to deform the hermetic container 20 to a predetermined shape efficiently, the heating temperature is preferably equal to or higher than the softening temperature of the material, and is preferably less than the melting point of the material. When the yield point is decreased by heating, radial spring-back of the hermetic container 20 after the convex portions 82 are formed by plastic deformation of the hermetic container 20, that is, return of the convex portions 82, is suppressed. Also, a predetermined push-in amount can be ensured efficiently and reliably. The push-in amount is the depth by which the convex portions 82 penetrate into the concave portions 72, and corresponds to the dimension indicated by H in Fig. 12. As described above, the material of the hermetic container 20 is iron and the softening temperature of iron is 600°C. The melting point of iron is approximately 1560°C. Therefore, the local heating temperature is preferably not less than 600°C and not more than 1560°C. Naturally, if a material other than iron is employed, the heating temperature changes. The heating temperature is desirably at least the softening temperature of the material and less than the melting point of the material.
[0094] Since the heating range 93 covers all of the machining holes 84 against each of which the pressing jig 91 is pressed, the convex portions 82 can be steadily formed using the above-described characteristics of the material of the hermetic container 20 at high temperature. Also, push-in force for forming the convex portions 82 is reduced, so that the strain occurring in the stator core 43 when the compressor 12 is assembled

can be reduced. Furthermore, the heating center 94 of the hermetic container 20 overlaps the center between the two concave portions 72. Thus, after the convex portions 82 are reliably formed on the hermetic container 20, the two concave portions 72 can be firmly squeezed by the two convex portions 82 that contract thermally toward the heating center 94.
[0095] The convex portions 82 of the hermetic container 20 is reliably formed in this maimer. The convex portions 82 of the hermetic container 20 firmly squeeze the portion between the concave portions 72 of the stator 41 of the motor 40, thereby fixing the stator 41 of the motor 40. Thus, the stator 41 of the motor 40 can be firmly fixed, so that, even in a long-term use of the compressor 12, the stator 41 withstands normal and excessive force generated during the operation of the compressor 12, and no backlash occurs.
[0096] The stator 41 of the motor 40 is supported in the axial direction of the compressor 12 by being squeezed by the convex portions 82 of the hermetic container 20. The stator 41 of the motor 40 is supported in the tangential direction not only by being squeezed by the convex portions 82 of the hermetic container 20 but also by the rigidity of the convex portions 82 of the hermetic container 20. Formation for fixing the stator 41 may be selected such that required fixing strength can be obtained in accordance with acceleration generated in the fixing portion 76. The fixing strength can be increased by, for example, increasing the sectional area of each convex portion 82 or increasing the number of fixing portions 76.
[0097] In this embodiment, since the groove-shaped concave portions 72 are formed at each of the plurality of portions of the stator core 43, the stator core 43 can be formed by lamination of the electromagnetic steel plates of the same type. Then, many different types of electromagnetic steel plates need not be prepared, so that the cost can

be suppressed and the risk of erroneously combining different types of electromagnetic steel plates can be decreased.
[0098] In this embodiment, in order to ensure higher fixing strength for the stator 41 and hermetic container 20, the stator 41 and hermetic container 20 are fitted by shrinkage fit in the placing step described above, and after that the machining step and fixing step are practiced. However, shrinkage fit is not indispensable. [0099] When shrinkage fit is to be carried out, after the stator 41 and hermetic container 20 are fitted by shrinkage fit, portions corresponding to the concave portions 72 of the stator 41, of the outer circumferential surface 83 of the hermetic container 20 are locally heated. Then, the pressing jig 91 is pressed radially inwardly against the outer circumferential surface 83 of the hermetic container 20, to thus form on the hermetic container 20 the convex portions 82 engageable with the concave portions 72. With thermal contraction due to cooling of the hermetic container 20, the portion between the concave portions 72 is clamped by the convex portions 82 of the hermetic container 20. As a result, the stator 41 can be fixed to the hermetic container 20 firmly and can be fixed to the hermetic container 20 stably without any occurrence of backlash when fixed by the thermal contraction.
[0100] In this embodiment, the stator 41 may be fitted in the hermetic container 20 by shrinkage fit with such small strength that minute backlash will not be generated between the stator 41 and the convex portions 82 of the hermetic container 20 having contracted thermally. Thus, compared to a case where the stator 41 and the hermetic container 20 are fixed only by conventional shrinkage fit, the contact area between the stator 41 and the hermetic container 20, which results from shrinkage fit, can be greatly reduced. As a result, the stress to act on the stator 41 can be decreased, and the performance of the compressor 12 can be improved.

[0101] In this embodiment, the stator core 43 is formed by bonding the T-shaped split cores 74 into an annular shape. The concave portions 72 formed in the outer circumferential surface 71 of the stator core 43 are provided in each split core 74. Assume that the two concave portions 72 close to each other are formed astride two split cores 74. Then, the force exerted when the two corresponding convex portions 82 contract thermally serves to push the two split cores 74 against each other, possibly causing degradation of the inner-diameter roundness of the stator core 43. On the other hand, if the two concave portions 72 close to each other are formed in one split core 74 such that they sandwich the center position in the circumferential direction of that split core 74, as illustrated in Fig. 9, a good inner-diameter roundness can be maintained due to the rigidity of this one split core 74 even when the corresponding two convex portions 82 contract thermally. Accordingly, magnetic imbalance sound can be suppressed.
[0102] In this embodiment, the concave portions 72 may be formed in the stator 41, for example, as square prepared holes instead of grooves. In that case as well, the stator 41 can be fixed to the hermetic container 20 in the same manner. For example, the square prepared holes in the stator 41 can be formed by laminating two types of electromagnetic steel plates. If the prepared holes in the stator 41 are square-shaped, the stator 41 is supported not only by squeezing with the convex portions 82 of the hermetic container 20 but also by the rigidity of the convex portions 82 of the hermetic container 20. As a result, the stator 41 can be fixed to the hermetic container 20 more firmly.
[0103] Having described the preferred embodiment of the present invention, it should be noted that the embodiment may be practiced partly. For example, among those each described as "portion" in the description of the embodiment, only one may be

employed, or an arbitrary combination of some may be employed. The present
invention is not limited to the embodiment, but various modifications may be made as
needed.
Reference Signs List
> [0104] 10: refrigerating cycle apparatus; 11a, lib: refrigerant circuit; 12: compressor; 13: four-way valve; 14: outdoor heat exchanger; 15: expansion valve; 16: indoor heat exchanger; 17: control device; 20: hermetic container; 21: intake pipe; 22: discharge pipe; 23: intake muffler; 24: terminal; 25: refrigerating machine oil; 30: compressing mechanism; 31: cylinder; 32: rolling piston; 33: main bearing; 34: sub-bearing; 35:
) discharge muffler; 36: vane; 37: vane spring; 40: motor; 41: stator; 42: rotor; 43: stator core; 44: winding; 45: lead wire; 46: rotor core; 47: insulating member; 48: upper end plate; 49: lower end plate; 50: crank shaft; 51: eccentric shaft portion; 52: main shaft portion; 53: sub-shafr portion; 61: vane groove; 62: cylinder chamber; 63: back-pressure chamber; 71: outer circumferential surface; 72: concave portion; 73: notch; 74: split
■ core; 75: tooth; 76: fixing portion; 77: projecting portion; 78: non-contact region; 79: contact region; 81: inner circumferential surface; 82: convex portion; 83: outer circumferential surface; 84: machining hole; 85: caulking portion; 91: pressing jig; 92: distal end portion; 93: heating range; 94: heating center

[Claim 1] A compressor comprising:
a motor having a stator with an outer circumferential surface where two concave portions lining up circumferentially are formed at each of a plurality of portions in a circumferential direction, and a notch is formed between the two concave portions;
a container with an inner circumferential surface where two convex portions lining up circumferentially are formed at each of a plurality of portions in a circumferential direction, each of the two convex portions penetrating into a corresponding one of the two concave portions, the two convex portions squeezing a portion where the notch is formed, of the stator, so as to fix the stator to an inside of the container; and
a compressing mechanism accommodated inside the container and being driven by the motor,
wherein a projecting portion is formed in a region between the notch and each of the two concave portions, on the outer circumferential surface of the stator, to project more radially outwardly than other regions on the outer circumferential surface of the stator, the inner circumferential surface of the container being brought into contact with the projecting portion.
[Claim 2] The compressor according to claim 1, wherein the region between the notch and each of the two concave portions, on the outer circumferential surface of the stator, is divided into a non-contact region and a contact region, the non-contact region being connected to the notch and having no projecting portion formed therein, the contact region being connected to either one of the two concave portions and having the

projecting portion formed therein.
[Claim 3] The compressor according to any one of claims 1 and 2, wherein the stator is
fitted inside the container by shrinkage fit, so that the inner circumferential surface of
the container is brought into contact with the projecting portion.
[Claim 4] The compressor according to any one of claims 1 to 3,
wherein the stator has a plurality of split cores linked circumferentially to constitute a stator core, and
wherein the two concave portions are arranged separately on two sides of a center position in a circumferential direction of each of the plurality of split cores. [Claim 5] The compressor according to any one of claims 1 to 4, wherein the two concave portions each extend axially to form a groove.
[Claim 6] A compressor manufacturing method of manufacturing a compressor including a motor, a compressing mechanism, and a container, the motor having a stator with an outer circumferential surface where two concave portions lining up circumferentially are formed at each of a plurality of portions in a circumferential direction, and a notch is formed between the two concave portions, the compressing mechanism being driven by the motor, the container accommodating the stator and the compressing mechanism, the compressor manufacturing method comprising:
a step of heating a plurality of portions in a circumferential direction of an inner circumferential surface of the container, and machining the heated plurality of portions, to form two convex portions each penetrating into a corresponding one of the two concave portions; and
a step of causing the two convex portions to contract thermally, so that the two convex portions squeeze a portion where the notch is formed, of the stator, so as to fix the stator to an inside of the container.