FORM 2
THE PATENTS ACT, 1970
(39 of 1970)
&
THE PATENTS RULES, 2003
COMPLETE SPECIFICATION
[See section 10, Rule 13]
MOTOR, FAN, AND AIR CONDITIONER;
MITSUBISHI ELECTRIC CORPORATION, A CORPORATION ORGANISED AND
EXISTING UNDER THE LAWS OF JAPAN, WHOSE ADDRESS IS 7-3,
MARUNOUCHI 2-CHOME, CHIYODA-KU, TOKYO 1008310, JAPAN
THE FOLLOWING SPECIFICATION PARTICULARLY DESCRIBES THE
INVENTION AND THE MANNER IN WHICH IT IS TO BE PERFORMED

2
DESCRIPTION
TECHNICAL FIELD
[0001]
The present disclosure relates to a motor, a fan, and an
5 air conditioner.
BACKGROUND ART
[0002]
Conventionally, there is a motor that includes a stator
covered with a mold resin part (see, for example, Patent
10 Reference 1).
PRIOR ART REFERENCE
PATENT REFERENCE
[0003]
Patent Reference 1: Internal Publication WO 2018/179025
15 (see FIG. 1)
SUMMARY OF THE INVENTION
PROBLEM TO BE SOLVED BY THE INVENTION
[0004]
In order to reduce vibration and noise of such a motor,
20 it is proposed to increase the strength of the mold resin part.
However, in such a case, the use amount of resin increases, and
thus the manufacturing cost increases.
[0005]
The present disclosure is intended to solve the above25 described problem, and an object of the present disclosure is
to reduce vibration and noise of the motor.
MEANS OF SOLVING THE PROBLEM
[0006]
A motor of the present disclosure includes a rotor, a
30 stator surrounding the rotor, a reinforcing member, and a mold
resin part covering the stator and the reinforcing member. The
tensile strength of the reinforcing member is higher than the
tensile strength of the mold resin part.
[0007]

3
Alternatively, a motor of the present disclosure includes
a rotor, a stator surrounding the rotor, a reinforcing member,
and a mold resin part covering the stator and the reinforcing
member. The elastic modulus of the reinforcing member is lower
5 than the elastic modulus of the mold resin part.
EFFECTS OF THE INVENTION
[0008]
In the present disclosure, by using the reinforcing
member whose tensile strength is higher than that of the mold
10 resin part, resistance to vibration is improved, and thus
vibration and noise of the motor can be reduced. Alternately,
by using of the reinforcing member whose elastic modulus is
lower than that of the mold resin part, vibration is absorbed
by the reinforcing member, and thus vibration and noise of the
15 motor can be reduced.
BRIEF DESCRIPTION OF THE DRAWINGS
[0009]
FIG. 1 is a partial sectional view illustrating a motor
of a first embodiment.
20 FIG. 2 is a sectional view illustrating a rotor of the
first embodiment.
FIG. 3 is a sectional view illustrating a mold stator of
the first embodiment.
FIGS. 4(A) and 4(B) are a plan view and a side view
25 illustrating a stator of the first embodiment.
FIGS. 5(A) and 5(B) are a plan view and a side view
illustrating the stator, a circuit board, and a board holding
member of the first embodiment.
FIG. 6 is a side view illustrating the stator, the
30 circuit board, the board holding member, and a reinforcing
member of the first embodiment.
FIGS. 7(A) and 7(B) are a plan view and a side view
illustrating the mold stator of the first embodiment.
FIG. 8 is a sectional view illustrating a mold used in a

4
manufacturing process of the motor of the first embodiment.
FIG. 9 is a flowchart illustrating the manufacturing
process of the motor of the first embodiment.
FIG. 10 is a partial sectional view illustrating a motor
5 of a second embodiment.
FIG. 11 is a sectional view illustrating a mold stator of
the second embodiment.
FIG. 12 is a diagram illustrating a mold stator of a
third embodiment.
10 FIG. 13 is a diagram illustrating a stator of a fourth
embodiment.
FIG. 14 is a sectional view illustrating a rotor of a
fifth embodiment.
FIG. 15(A) is a diagram illustrating an air conditioner
15 to which the motor of each embodiment is applicable, and FIG.
15(B) is a sectional view illustrating an outdoor unit.
MODE FOR CARRYING OUT THE INVENTION
[0010]
First Embodiment
20 (Configuration of Motor 1)
FIG. 1 is a partial sectional view illustrating a motor 1
in a first embodiment. The motor 1 is used, for example, in a
fan of an air conditioner.
[0011]
25 The motor 1 includes a rotor 2 having a shaft 11, and a
mold stator 4. The mold stator 4 has an annular stator 5
surrounding the rotor 2, a circuit board 6, a reinforcing
member 3, and a mold resin part 40 covering these components.
The shaft 11 is a rotational shaft of the rotor 2.
30 [0012]
In the description below, the direction of the axis C1,
which is the center axis of the shaft 11, is referred to as an
"axial direction". The circumferential direction about the
axis C1 of the shaft 11 is referred to as a "circumferential

5
direction" and indicated by an arrow R1 in FIG. 2 and other
figures. The radial direction about the axis C1 of the shaft
11 is referred to as a "radial direction".
[0013]
5 The shaft 11 protrudes from the mold stator 4 to the left
in FIG. 1. An impeller 505 (FIG. 15(A)) of a fan, for example,
is attached to an attachment portion 11a formed in a protruding
portion of the shaft. Therefore, the protruding side (the left
side in FIG. 1) of the shaft 11 is referred to as a "load side",
10 while the opposite side (the right side in FIG. 1) is referred
to as a "counter-load side".
[0014]
(Configuration of Rotor 2)
FIG. 2 is a sectional view illustrating the rotor 2. As
15 illustrated in FIG. 2, the rotor 2 has the shaft 11, a rotor
core 21 disposed on the outer side of the shaft 11 in the
radial direction, a plurality of magnets 23 embedded in the
rotor core 21, and a resin part 25 provided between the shaft
11 and the rotor core 21.
20 [0015]
The rotor core 21 is a member having an annular shape
about the axis C1 and is provided on the outer side of the
shaft 11 in the radial direction. The rotor core 21 is formed
of a plurality of electromagnetic steel sheets which are
25 stacked in the axial direction and fixed together in the axial
direction by crimping, welding, or bonding. The sheet
thickness of each electromagnetic steel sheet is, for example,
0.1 mm to 0.7 mm.
[0016]
30 The rotor core 21 has a plurality of magnet insertion
holes 22. The magnet insertion holes 22 are arranged at equal
intervals in the circumferential direction and at equal
distances from the axis C1. The number of magnet insertion
holes 22 is five in this example.

6
[0017]
The magnet insertion hole 22 extends linearly in a
direction orthogonal to a straight line extending in the radial
direction and passing through a center of the magnetic
5 insertion hole in the circumferential direction. In this
regard, the magnet insertion hole 22 may have a V shape such
that its center in the circumferential direction protrudes
toward the axis C1 side.
[0018]
10 A flux barrier 27, which is a cavity, is formed on each
side of the magnet insertion hole 22 in the circumferential
direction. A thin wall portion is formed between the flux
barrier 27 and an outer circumference of the rotor core 21. In
order to suppress leakage magnetic flux between adjacent
15 magnetic poles, the thickness of the thin wall portion is set,
for example, equal to the sheet thickness of the
electromagnetic steel sheet.
[0019]
The magnet 23, which is a permanent magnet, is inserted
20 in each magnet insertion hole 22. The magnet 23 is made of,
for example, a rare earth magnet that contains neodymium (Nd),
iron (Fe) and boron (B), or a rare earth magnet that contains
samarium (Sm), iron and nitrogen (N). The magnet 23 is in the
form of a flat plate and has a rectangular cross-sectional
25 shape in a plane orthogonal to the axial direction. The magnet
23 is also referred to as a main magnet.
[0020]
Five magnets 23 have the same magnetic poles on their
outer sides in the radial direction. In the rotor core 21,
30 magnetic poles opposite to the magnets 23 are formed in regions
each between the magnets 23 adjacent in the circumferential
direction.
[0021]
Therefore, five magnet magnetic poles P1 formed by the

7
magnets 23 and five virtual magnetic poles P2 formed by the
rotor core 21 are arranged alternately in the circumferential
direction in the rotor 2. Such a rotor 2 is referred to as a
consequent-pole rotor.
5 [0022]
Hereinafter, when the term "magnetic pole" is simply used,
it refers to either the magnet magnetic pole P1 or the virtual
magnetic pole P2. The number of poles in the rotor 2 is 10.
The magnetic poles P1 and P2 of the rotor 2 are arranged at
10 equal angular intervals in the circumferential direction. A
boundary between the magnet magnetic pole P1 and the virtual
magnetic pole P2 defines a pole-boundary M.
[0023]
The outer circumference of the rotor core 21 has a so15 called flower shape in a plane orthogonal to the axial
direction. In other words, the outer circumference of the
rotor core 21 has its outer diameter maximum at the pole center
of each of the magnetic poles P1 and P2 and minimum outer
diameter at each pole-boundary M, and extends in an arc shape
20 from the pole center to the pole-boundary M. The outer
circumference of the rotor core 21 is not limited to the flower
shape but may be a circular shape.
[0024]
Although the number of poles of the rotor 2 is 10 in this
25 example, it is sufficient that the number of poles of the rotor
2 is an even number of 4 or more. Moreover, although one
magnet 23 is disposed in each magnet insertion hole 22, two or
more magnets 23 may be disposed in each magnet insertion hole
22.
30 [0025]
The nonmagnetic resin part 25 is provided between the
shaft 11 and the rotor core 21. The resin part 25 holds the
shaft 11 and the rotor core 21 in a state where the shaft 11
and the rotor core 21 are separated from each other. The resin

8
part 25 is desirably made of a thermoplastic resin such as
polybutylene terephthalate (PBT).
[0026]
The resin part 25 includes an annular inner cylindrical
5 portion 25a fixed to the shaft 11, an annular outer cylindrical
portion 25c fixed to an inner circumference of the rotor core
21, and a plurality of ribs 25b connecting the inner
cylindrical portion 25a and the outer cylindrical portion 25c.
The ribs 25b are arranged at equal intervals in the
10 circumferential direction. The number of ribs 25b is, for
example, half the number of poles, and is five in this example.
[0027]
The shaft 11 is fixed to the inside of the inner
cylindrical portion 25a of the resin part 25. The ribs 25b are
15 arranged at equal intervals in the circumferential direction
and radially extend outward in the radial direction from the
inner cylindrical portion 25a. Hollow portions 26 are formed
each between the ribs 25b adjacent in the circumferential
direction. In this example, the number of ribs 25b is half the
20 number of poles, and the positions of the ribs 25b in the
circumferential direction coincide with the pole centers of the
virtual magnetic poles P2, but the number and arrangement of
the ribs 25b are not limited thereto.
[0028]
25 As illustrated in FIG. 1, a sensor magnet 24 is disposed
to face the rotor core 21 in the axial direction. The sensor
magnet 24 is held by the resin part 25. The magnetic field of
the sensor magnet 24 is detected by a magnetic sensor mounted
on the circuit board 6, by which the position of the rotor 2 in
30 the circumferential direction, i.e., the rotational position of
the rotor 2 is detected.
[0029]
(Configuration of Mold Stator 4)
FIG. 3 is a sectional view illustrating the mold stator 4.

9
The mold stator 4 has the stator 5, the circuit board 6, the
reinforcing member 3, and the mold resin part 40 as described
above. The stator 5 has a stator core 51, an insulating
portion 52 provided on the stator core 51, and coils 53 wound
5 on the stator core 51 via the insulating portion 52.
[0030]
The stator core 51 is formed of a plurality of
electromagnetic steel sheets which are stacked in the axial
direction and fixed together in the axial direction by crimping,
10 welding, or bonding. The sheet thickness of each
electromagnetic steel sheet is, for example, 0.1 mm to 0.7 mm.
[0031]
The mold resin part 40 is formed of a mold resin, for
example, a thermosetting resin such as a bulk molding compound
15 (BMC). BMC contains unsaturated polyester as a main component
to which a reinforcing material such as glass fiber is added.
The mold resin part 40 may be formed of a thermoplastic resin
such as PBT.
[0032]
20 The mold resin part 40 includes a bearing support portion
41 on the counter-load side and an opening 42 on the load side.
The rotor 2 (FIG. 1) is inserted into a hollow portion inside
the mold stator 4 through the opening 42.
[0033]
25 With reference to FIG. 1 again, a metal bracket 15 is
attached to the opening 42 of the mold resin part 40. One
bearing 12 supporting the shaft 11 is held by the bracket 15.
A cap 14 for preventing entry of water or the like is attached
to the outside of the bracket 15. The bearing support portion
30 41 of the mold resin part 40 has an inner circumferential
surface having a cylindrical shape. On the inner
circumferential surface, the other bearing 13 supporting the
shaft 11 is held.
[0034]

10
The mold resin part 40 has attachment legs 45 attached to
a motor support 10. Four attachment legs 45 are provided at
intervals of 90 degrees about the axis C1 as described later.
[0035]
5 Each attachment leg 45 of the mold resin part 40 has an
attachment portion 46 which is a hole. The attachment legs 45
of the mold resin part 40 are fixed, for example, to a frame
509 of an outdoor unit 501 by screws 48 (FIG. 15(B)).
[0036]
10 FIG. 4(A) is a plan view illustrating the stator core 51,
the insulating portion 52, and the coils 53. FIG. 4(B) is a
side view illustrating the stator core 51, the insulating
portion 52, and the coils 53. The stator core 51 has a yoke
51a having an annular shape about the axis C1 and a plurality
15 of teeth 51b extending inward in the radial direction from the
yoke 51a. The number of teeth 51b is 12 in this example, but
is not limited to 12. In FIG. 4(A), two teeth 51b are
indicated by dashed lines.
[0037]
20 The coil 53 is, for example, a magnet wire, and is wound
around the tooth 51b via the insulating portion 52. The
insulating portion 52 is made of, for example, a thermoplastic
resin such as PBT. The insulating portion 52 is formed by
integrally molding the thermoplastic resin with the stator core
25 51 or by assembling a molded body of the thermoplastic resin to
the stator core 51.
[0038]
The insulating portion 52 has wall portions on the inner
and outer sides of the coils 53 in the radial direction, and
30 the wall portions guide the coils 53 from both sides in the
radial direction. A plurality of terminals 57 are attached to
the insulating portion 52. The ends of coils 53 are connected
to the terminals 57, for example, by fusing (thermal caulking),
soldering or the like.

11
[0039]
Further, the insulating portion 52 is provided with a
plurality of protrusions 56 for fixing the circuit board 6.
The protrusions 56 are inserted through attachment holes formed
5 in the circuit board 6.
[0040]
With reference to FIG. 1 again, the circuit board 6 is
disposed on the counter-load side of the stator 5. The circuit
board 6 is a printed board on which a drive circuit 61 such as
10 a power transistor for driving the motor 1 is mounted. Lead
wires 63 are wired on the circuit board 6. The lead wires 63
on the circuit board 6 are drawn out to the outside of the
motor 1 through a lead wire outlet component 62 attached to an
outer circumferential portion of the mold resin part 40.
15 [0041]
FIG. 5(A) is a plan view illustrating the stator 5, the
circuit board 6, and a board holding member 7. FIG. 5(B) is a
side view illustrating the stator 5, the circuit board 6, and
the board holding member 7. The circuit board 6 is disposed so
20 that a surface of the circuit board 6 is orthogonal to the
axial direction. An opening for providing a space to house the
bearing 13 (FIG. 1) is formed at the center of the circuit
board 6 in the radial direction. The above-described lead wire
outlet component 62 is attached to an outer circumferential
25 portion of the circuit board 6.
[0042]
The board holding member 7 as a support member is
provided on a side opposite to the stator 5 with respect to the
circuit board 6. The board holding member 7 is provided to
30 suppress deformation of the circuit board 6 during molding.
The board holding member 7 is made of, for example, a resin
such as PBT.
[0043]
The board holding member 7 includes a rib 71 extending

12
along an outer circumference of the circuit board 6, a rib 72
extending along an inner circumference of the circuit board 6,
and ribs 73 connecting these ribs 71 and 72, thereby forming a
framework. In this regard, the shape of the board holding
5 member 7 is not limited to such a shape.
[0044]
The board holding member 7 has attachment holes 76
through which the protrusions 56 of the insulating portion 52
are inserted. The insulating portions 52 protrude through the
10 attachment holes 76 in the axial direction. By thermally or
ultrasonically welding the protruding tips of the protrusions
56, the circuit board 6 and the board holding member 7 are
fixed to the stator 5.
[0045]
15 The board holding member 7 has a plurality of convex
portions 75 protruding on a side opposite to the stator 5. The
convex portions 75 are formed on the ribs 71, 72, and 73, and
are arranged so as to be distributed across the whole board
holding member 7. The convex portions 75 are support portions
20 that support the reinforcing member 3. In this regard, the
board holding member 7 is not illustrated in FIGS. 1 to 3.
[0046]
FIG. 6 is a side view illustrating the stator 5, the
circuit board 6, the board holding member 7, and the
25 reinforcing member 3. The reinforcing member 3 is supported by
the convex portions 75 of the board holding member 7. The
stator 5, the circuit board 6, the board holding member 7, and
the reinforcing member 3 constitute a stator assembly 50.
[0047]
30 The reinforcing member 3 is formed of, for example, a
metal, more specifically iron or aluminum. The reinforcing
member 3 has a main portion 30, a flange portion 31, and leg
portions 32. The main portion 30 is a plate-shaped portion
having a circular shape in a plane orthogonal to the axial

13
direction. The flange portion 31 is located on the stator 5
side with respect to the main portion 30, and is formed in an
annular shape along an outer circumference of the main portion
30. The leg portions 32 extend outward in the radial direction
5 from the flange portion 31.
[0048]
With reference to FIG. 3 again, the reinforcing member 3
has a surface 35 on the side opposite to the stator 5 in the
axial direction and also has a recess 36 on the stator 5 side.
10 The surface 35 is a plane orthogonal to the axial direction,
for example. The recess 36 is a portion in which the bearing
13 (FIG. 1) is housed.
[0049]
A part of the reinforcing member 3, the stator 5, the
15 circuit board 6, and the board holding member 7 are covered
with the mold resin part 40 (FIG. 1) to constitute the mold
stator 4. The leg portions 32 of the reinforcing member 3 are
covered with the mold resin part 40. Meanwhile, the surface 35
and an outer circumferential surface of the main portion 30 of
20 the reinforcing member 3 and the surface of the flange portion
31 are exposed from the mold resin part 40.
[0050]
A portion of the reinforcing member 3 covered with the
mold resin part 40 is also referred to as a first portion. The
25 first portion includes, for example, the leg portions 32. A
portion of the reinforcing member 3 which is exposed from the
mold resin part 40 is also referred to as a second portion.
The second portion includes, for example, the surface 35 and
the outer circumferential surface of the main portion 30 and
30 the surface of the flange portion 31.
[0051]
FIGS. 7 (A) and 7(B) are a plan view and a side view
illustrating the mold stator 4. As illustrated in FIG. 7(A),
the mold resin part 40 has the plurality of attachment legs 45

14
arranged at equal distances from the axis C1. In this example,
four attachment legs 45 are formed at intervals of 90 degrees
about the axis C1. In this regard, the number of attachment
legs 45 is not limited to four.
5 [0052]
The attachment leg 45 has the attachment portion 46 which
is a hole. The attachment portion 46 is a part through which
the screw 48 for fixing the motor 1 (FIG. 15(B)) is inserted.
The attachment portion 46 is formed because a resin does not
10 flow into an area where a positioning pin 209 of a mold 200
(FIG. 8) is present during molding.
[0053]
An inner circumferential surface of the attachment
portion 46 has a circular shape in a plane orthogonal to the
15 axial direction. The inner circumferential surface of the
attachment portion 46 is parallel to the axial direction. The
attachment portion 46 is not limited to the hole, but may be a
concave portion. In such a case, an inner circumferential
surface of the concave portion is desirably arc-shaped in a
20 plane orthogonal to the axial direction.
[0054]
The plurality of leg portions 32 extend outward in the
radial direction from the flange portion 31 of the reinforcing
member 3. The leg portions 32 are arranged at equal distances
25 from the axis C1 and at equal intervals about the axis C1.
[0055]
In this example, the leg portions 32, the number of which
is the same as the number of attachment legs 45 of the mold
resin part 40, are formed in positions corresponding to the
30 attachment legs 45. That is, the four leg portions 32 are
formed at intervals of 90 degrees about the axis C1.
[0056]
An attachment portion 33, which is a concave portion, is
formed at the tip end of each leg portion 32, i.e., the end of

15
each leg portion 32 on the outer side in the radial direction.
The attachment portion 33 of the leg portion 32 is formed at a
position that overlaps the attachment portion 46 of the
attachment leg 45 in the axial direction.
5 [0057]
An inner circumferential surface of the attachment
portion 33 has an arc shape, more specifically a semicircular
shape, in a plane orthogonal to the axial direction. The inner
circumferential surface of the attachment portion 33 is
10 parallel to the axial direction. The attachment portion 33 is
brought into contact with the positioning pin 209 of the mold
200 (FIG. 8) and thereby functions to position the reinforcing
member 3 in the circumferential direction. In this regard, the
attachment portion 33 is not limited to the concave portion,
15 but may be a hole. In such a case, an inner circumferential
surface of the hole is desirably circular in a plane orthogonal
to the axial direction.
[0058]
(Manufacturing Method of Motor 1)
20 Next, a manufacturing process of the motor 1 will be
described. FIG. 8 is a sectional view illustrating the mold
200 used in the manufacturing process of the motor 1. The mold
200 has an upper mold 201 and a lower mold 202 that can be
opened and closed. A cavity 204 is formed between both molds
25 201 and 202. The lower mold 202 is provided with a gate 208.
The gate 208 is a flow passage through which a resin is
injected into the cavity 204.
[0059]
The upper mold 201 is provided with a reinforcing member
30 housing 203 for housing the reinforcing member 3. Further, the
upper mold 201 has a contact surface 210 which is brought in
contact with the flange portion 31 of the reinforcing member 3.
[0060]
The lower mold 202 is provided with a columnar core 205

16
that protrudes within the cavity 204. The core 205 is a
portion that engages with the inner side of the stator core 51.
A larger-diameter portion 206 overhanging outward in the radial
direction from the core 205 is formed at a lower end of the
5 core 205. The larger-diameter portion 206 is a portion
corresponding to the opening 42 (FIG. 3) of the mold stator 4.
[0061]
The lower mold 202 is provided with the positioning pins
209 as positioning members that are engaged with the attachment
10 portions 33 of the reinforcing member 3. The positioning pins
209 extend in the axial direction within the cavity 204.
[0062]
FIG. 9 is a flowchart illustrating a manufacturing
process of the motor 1. First, a plurality of electromagnetic
15 steel sheets are stacked in the axial direction and fixed
together by crimping or the like, thereby forming the stator
core 51 (step S101). Then, the insulating portion 52 is
attached to or molded integrally with the stator core 51 (step
S102). Furthermore, the coils 53 are wound on the stator core
20 51 via the insulating portion 52 (step S103). In this way, the
stator 5 is formed.
[0063]
Then, the circuit board 6 and the board holding member 7
are attached to the stator 5 (step S104). At this time, the
25 protrusions 56 (FIG. 5(B)) of the insulating portion 52 of the
stator 5 are inserted through the attachment holes of the
circuit board 6 and the attachment holes 76 of the board
holding member 7 (FIG. 5(A)), and then the tips of the
protrusions 56 are welded thereto thermally or the like,
30 whereby the circuit board 6 and the board holding member 7 are
fixed to the stator 5.
[0064]
Then, the reinforcing member 3 is attached to the board
holding member 7 on the stator 5 (step S105). The reinforcing

17
member 3 is supported in a state where the reinforcing member 3
is placed on the convex portions 75 of the board holding member
7. Thus, the stator assembly 50 (FIG. 6), which is formed of
the stator 5, the circuit board 6, the board holding member 7,
5 and the reinforcing member 3, is obtained.
[0065]
Next, the stator assembly 50 is placed in the mold 200,
and molding is performed (step S106).
[0066]
10 Specifically, first, the upper mold 201 of the mold 200
is moved upward to open the cavity 204, and the stator assembly
50 is placed in the cavity 204. At this time, the positioning
pins 209 of the mold 200 are engaged with the attachment
portions 33 of the reinforcing member 3, thereby positioning
15 the stator assembly 50 within the cavity 204.
[0067]
Since the plurality of attachment portions 33 of the
reinforcing member 3 are formed at equal distances from the
axis C1 and at equal intervals in the circumferential direction,
20 the position of the stator assembly 50 in the circumferential
direction can be changed in a plurality of ways in the cavity
204. A part of the lead wire outlet component 62 and a part of
the lead wires 63 protrude to the outside of the cavity 204.
[0068]
25 After the stator assembly 50 is placed in the cavity 204,
the upper mold 201 is moved downward to close the cavity 204,
and then a mold resin in a molten state is injected into the
cavity 204 through the gate 208. The mold resin injected into
the cavity 204 covers the stator assembly 50.
30 [0069]
In a case where a thermosetting resin is used as the mold
resin, the mold resin is injected into the cavity 204, and then
the mold 200 is heated so as to harden the mold resin in the
cavity 204. In this way, the mold stator 4 in which the stator

18
assembly 50 is covered with the mold resin part 40 is formed.
[0070]
In this regard, in the mold resin part 40 of the mold
stator 4, the resin does not flow into portions where the
5 positioning pins 209 are present, and thus the attachment
portions 46 (FIG. 7(A)) are formed.
[0071]
Aside from steps S101 to S106, the rotor 2 is formed.
That is, a plurality of electromagnetic steel sheets are
10 stacked and fixed together in the axial direction by crimping
or the like to form the rotor core 21. Then, the magnets 23
are inserted into the magnet insertion holes 22. Furthermore,
the shaft 11, the rotor core 21, the magnets 23, and the sensor
magnet 24 are integrally molded with a resin which is to be the
15 resin part 25. In this way, the rotor 2 is formed.
[0072]
Thereafter, the bearings 12 and 13 are attached to the
shaft 11 of the rotor 2, and the rotor 2 is inserted into the
inside of the stator 5 through the opening 42 of the mold
20 stator 4 (step S107). Further, the bracket 15 is attached to
the opening 42 of the mold stator 4, and the cap 14 is attached
to the outer side of the bracket 15. Consequently, the
manufacture of the motor 1 is completed.
[0073]
25 (Function)
Next, the function to reduce vibration and noise in the
first embodiment will be described. In the consequent-pole
rotor 2, the magnetic flux density at the magnet magnetic pole
P1 where the magnet 23 is provided is greater than the magnetic
30 flux density at the virtual magnetic pole P2 where the magnet
23 is not provided.
[0074]
Thus, the magnetic attractive force acting between the
rotor 2 and the teeth 51b of the stator 5 is larger at the

19
magnet magnetic pole P1 and smaller at the virtual magnetic
pole P2. Thus, when the rotor 2 rotates, an excitation force
in the radial direction applied to the rotor 2.
[0075]
5 The excitation force in the radial direction applied to
the rotor 2 causes vibration and noise of the motor 1. In
order to reduce vibration and noise of the motor 1, it is
proposed to enhance the strength of the mold resin part 40 by
increasing the amount of the mold resin, but this leads to an
10 increase in the manufacturing cost.
[0076]
For this reason, in the first embodiment, the stator 5
and the reinforcing member 3 are integrally molded with the
mold resin part 40. The reinforcing member 3 is formed of a
15 material having a higher tensile strength than the mold resin
part 40.
[0077]
The mold resin part 40 is formed of, for example, BMC or
PBT as described above. The tensile strength of BMC is 50 to
20 250 MPa. The tensile strength of PBT is 50 to 250 MPa.
[0078]
Meanwhile, the reinforcing member 3 is formed of, for
example, iron or aluminum. The tensile strength of iron is 400
to 600 MPa. The tensile strength of aluminum is 300 to 500 MPa.
25 [0079]
Since the reinforcing member 3 having a high tensile
strength and the stator 5 are integrally molded using the mold
resin as described above, the resistance to vibration caused
when the rotor 2 rotates can be improved. Consequently,
30 vibration and noise of the motor 1 can be reduced.
[0080]
Since it is not necessary to increase the use amount of
mold resin, an increase in the manufacturing cost can be
suppressed.

20
[0081]
The reinforcing member 3 is formed of iron or aluminum in
this example, but may be formed of other metal or may be formed
of a resin, as long as the reinforcing member 3 has a higher
5 tensile strength than the mold resin part 40. Also in this
case, the resistance to vibration can be improved, and
vibration and noise of the motor 1 can be reduced.
[0082]
Next, functions other than the reduction of vibration and
10 noise will be described. As described above, the mold resin
part 40 is formed of a resin such as BMC or PBT, while the
reinforcing member 3 is formed of a metal such as iron or
aluminum.
[0083]
15 The thermal conductivity of BMC is 0.1 to 1 W/m·K, and
the thermal conductivity of PBT is 0.1 to 1 W/m·K. In contrast,
the thermal conductivity of iron is 30 to 80 W/m·K, and the
thermal conductivity of aluminum is 80 to 300 W/m·K.
[0084]
20 Since the thermal conductivity of the reinforcing member
3 is higher than the thermal conductivity of the mold resin
part 40 as above, heat generated in the coils 53 and the
circuit board 6 of the motor 1 can be efficiently dissipated to
the outside of the motor 1 via the reinforcing member 3. Thus,
25 an increase in the temperature of the motor 1 is suppressed.
[0085]
The mold resin part 40 may be formed of a nonmagnetic
resin such as BMC. Thus, magnetic flux leakage to the outside
of the motor 1 can be suppressed by the mold resin part 40. By
30 suppressing the leakage magnetic flux in this way, the motor
efficiency can be improved.
[0086]
Since the reinforcing member 3 has the attachment
portions 33 while the mold resin part 40 has the attachment

21
legs 45, the attachment portions 33 and 46 can be used as
insertion holes for the screws 48 (FIG. 15(B)).
[0087]
(Effects of Embodiment)
5 As described above, the motor 1 of the first embodiment
includes the rotor 2, the stator 5, the reinforcing member 3,
and the mold resin part 40 that covers the stator 5 and the
reinforcing member 3. The tensile strength of the reinforcing
member 3 is higher than the tensile strength of the mold resin
10 part 40. Thus, the resistance to vibration can be improved,
and vibration and noise of the motor 1 can be reduced.
[0088]
Since the stator 5 and the reinforcing member 3 are
covered with the mold resin part 40, processes such as screwing
15 or press-fitting can be eliminated. Thus, the number of
processes can be reduced, as compared with the case where the
reinforcing member 3 is attached to the mold stator 4 from
outside.
[0089]
20 In particular, since the reinforcing member 3 is formed
of a metal such as iron or aluminum, the resistance to
vibration can be improved, and the effect of reducing vibration
and noise can be enhanced.
[0090]
25 The thermal conductivity of the reinforcing member 3 is
higher than the thermal conductivity of the mold resin part 40,
so that heat generated in the motor 1 can be dissipated to the
outside through the reinforcing member 3.
[0091]
30 Since the mold resin part 40 is nonmagnetic, the magnetic
flux leakage to the outside of the motor 1 can be suppressed,
and the motor efficiency can be improved.
[0092]
Since the mold resin part 40 is formed of a

22
thermosetting resin such as BMC, it is possible to obtain high
dimensional stability. Thus, the balance in the shape and
weight of the mold resin part 40 can be improved, and the
quietness of the motor 1 can be enhanced. When the mold resin
5 part 40 is formed of a thermoplastic resin such as PBT, the
mold resin can be reused.
[0093]
Since the reinforcing member 3 is supported by the board
holding member 7, a common member can be used to prevent
10 deformation of the circuit board 6 and to support the
reinforcing member 3 during molding.
[0094]
The reinforcing member 3 has the leg portions 32 (first
portion) covered with the mold resin part 40 and the main
15 portion 30 and the flange portion 31 (second portion) which are
exposed from the mold resin part 40. Thus, heat generated in
the motor 1 can be dissipated to the outside through the
exposed portion of the reinforcing member 3, and the heat
dissipation effect can be enhanced.
20 [0095]
The attachment portion 33, which has the inner
circumferential surface parallel to the axis C1, is formed on
the leg portion 32, and thus the stator assembly 50 can be
positioned within the mold 200 by bringing the inner
25 circumferential surface of the attachment portion 33 into
contact with the positioning pin 209 of the mold 200.
[0096]
As the mold resin part 40 has the plurality of attachment
portions 46 arranged at equal distances from the axis C1 while
30 the reinforcing member 3 has the plurality of attachment
portion 33 arranged at equal distances from the axis C1, the
stator assembly 50 can be positioned even when the rotational
position of the stator assembly 50 is changed in the mold 200.
[0097]

23
Since each of the attachment portion 46 of the mold resin
part 40 and the attachment portion 33 of the reinforcing member
3 has a circular shape or arc shape, the structure of the
positioning pin 209 of the mold 200 can be simplified.
5 [0098]
In addition, the rotor 2 is of the consequent-pole type
which has the magnet magnetic poles P1 and the virtual magnetic
poles P2 and in which the excitation force in the radial
direction is likely to be generated, and thus the provision of
10 the reinforcing member 3 is particularly effective in reducing
vibration and noise.
[0099]
Moreover, since the reinforcing member 3 is disposed on
one side of the stator 5 in the axial direction, vibration and
15 noise can be reduced without increasing the size of the motor 1
in the radial direction.
[0100]
Second Embodiment
Next, a second embodiment will be described. FIG. 10 is
20 a sectional view illustrating a motor 1A of the second
embodiment. FIG. 11 is a sectional view illustrating a mold
stator 4A of the second embodiment. The second embodiment
differs from the first embodiment in the material of a
reinforcing member 3A of the motor 1A. The shape of the
25 reinforcing member 3A is the same as that of the reinforcing
member 3 of the first embodiment.
[0101]
The reinforcing member 3A of the second embodiment is
formed of a material having a lower elastic modulus than that
30 of the mold resin part 40. The mold resin part 40 is formed of,
for example, BMC or PBT as described in the first embodiment.
The elastic modulus of BMC is 3 to 20 GPa. The elastic modulus
of PBT is 3 to 20 GPa.
[0102]

24
Meanwhile, the reinforcing member 3A is formed of, for
example, a rubber, more specifically silicone rubber. The
elastic modulus of silicone rubber is 0.5 to 1.5 MPa.
[0103]
5 Since the reinforcing member 3A is formed of a material
having a lower elastic modulus than that of the mold resin part
40 as above, vibration caused when the rotor 2 rotates can be
absorbed by the reinforcing member 3A. Thus, vibration and
noise of the motor 1 can be reduced. In particular, a rubber
10 such as silicone rubber has high vibration absorption
performance and thus vibration and noise of the motor 1 can be
effectively reduced.
[0104]
The reinforcing member 3A is not limited to silicone
15 rubber, but may be formed of any material having a lower
elastic modulus than that of the mold resin part 40. In this
regard, a rubber is desirable because it has high vibration
absorption performance.
[0105]
20 As described in the first embodiment, the effect of
efficiently dissipating heat of the motor 1 to the outside can
be achieved when the thermal conductivity of the reinforcing
member 3A is higher than the thermal conductivity of the mold
resin part 40.
25 [0106]
The thermal conductivity of BMC is 0.1 to 1 W/m·K, and
the thermal conductivity of PBT is 0.1 to 1 W/m·K. Meanwhile,
the thermal conductivity of silicone rubber, which is an
example of the reinforcing member 3A, is 1 to 5 W/m·K. Since
30 the thermal conductivity of the reinforcing member 3A is higher
than the thermal conductivity of the mold resin part 40 as
described above, heat of the motor 1 can be efficiently
dissipated to the outside.
[0107]

25
When the heat resistance temperature of the reinforcing
member 3A is higher than the molding temperature during molding,
the molding described in the first embodiment can be performed.
[0108]
5 The molding temperature in the molding process of the
mold resin part 40 using BMC is 130 to 200°C, and the heat
resistance temperature of silicone rubber is 100 to 350°C. By
setting the heat resistance temperature of the reinforcing
member 3A to be higher than the molding temperature of BMC
10 within these temperature ranges, it is possible to mold the
reinforcing member 3A integrally with the stator 5, the circuit
board 6 (FIG. 6) and the like using the mold resin.
[0109]
The molding temperature in the molding process of the
15 mold resin part 40 using PBT is 230 to 280°C, and the heat
resistance temperature of silicone rubber is 100 to 350°C. By
setting the heat resistance temperature of the reinforcing
member 3A to be higher than the molding temperature of PBT
within these temperature ranges, it is possible to mold the
20 reinforcing member 3A integrally with the stator 5, the circuit
board 6 (FIG. 6) and the like using the mold resin.
[0110]
The motor 1A of the second embodiment is configured in a
similar manner to the motor 1 of the first embodiment except
25 for the above-described points.
[0111]
As described above, the motor 1A of the second embodiment
has the rotor 2, the stator 5, the reinforcing member 3A, and
the mold resin part 40 that covers the stator 5 and the
30 reinforcing member 3A. The elastic modulus of the reinforcing
member 3A is lower than the elastic modulus of the mold resin
part 40. Consequently, vibration is absorbed in the
reinforcing member 3A, and thus vibration and noise of the
motor 1 can be reduced.

26
[0112]
In particular, a rubber such as silicone rubber has high
vibration absorption performance and thus vibration and noise
of the motor 1 can be effectively reduced.
5 [0113]
The thermal conductivity of the reinforcing member 3A is
higher than the thermal conductivity of the mold resin part 40,
so that the effect of dissipating heat of the motor 1 to the
outside can be exhibited.
10 [0114]
Third Embodiment
Next, a third embodiment will be described. FIG. 12 is a
plan view illustrating a mold stator 4B of the third embodiment.
The third embodiment differs from the first and second
15 embodiments in the shape of a reinforcing member 3B and a mold
resin part 40B.
[0115]
Attachment portions 38, which are concave portions, are
formed at an outer circumference of the reinforcing member 3B.
20 An inner circumferential surface of each attachment portion 38
has an arc shape, more specifically a semicircular shape, in a
plane orthogonal to the axial direction. The inner
circumferential surface of the attachment portion 38 is
parallel to the axial direction.
25 [0116]
A plurality of attachment portions 38 of the reinforcing
member 3B are formed at equal intervals in the circumferential
direction. In this example, two attachment portions 38 are
formed at intervals of 180 degrees about the axis C1.
30 [0117]
During molding, the attachment portions 38 of the
reinforcing member 3B can be brought into contact with the
positioning members provided in the mold 200. Thus, the stator
assembly 50 (FIG. 6) including the reinforcing member 3B can be

27
positioned in the mold 200.
[0118]
Attachment portions 49, which are concave portions, are
formed in a position corresponding to the attachment portions
5 38 of the reinforcing member 3 in the mold resin part 40. An
inner circumferential surface of each attachment portion 49 has
an arc shape, more specifically a semicircular shape, in a
plane orthogonal to the axial direction. The inner
circumferential surface of the attachment portion 49 is
10 parallel to the axial direction.
[0119]
The attachment portions 49 of the mold resin part 40 are
portions formed because a resin does not flow into areas where
the positioning members of the mold 200 are present. That is,
15 each attachment portion 38 of the reinforcing member 3B is a
portion (second portion) exposed from the mold resin part 40.
[0120]
The motor of the third embodiment is configured in a
similar manner to the motor 1 of the first embodiment except
20 for the points described above. It is also possible to use the
reinforcing member 3A described in the second embodiment.
[0121]
In the third embodiment, the stator assembly 50 (FIG. 6)
including the reinforcing member 3B can be positioned in the
25 mold 200 by bringing the attachment portions 38 of the
reinforcing member 3B into contact with the positioning members
of the mold 200. Thus, the positional accuracy of the stator
assembly 50 in the mold 200 can be improved, and the
dimensional accuracy of the motor 1 can be improved.
30 [0122]
Fourth Embodiment
Next, a fourth embodiment will be described. FIG. 13 is
a side view illustrating a stator assembly 50C of the fourth
embodiment. In the above-described first embodiment, the

28
reinforcing member 3 is supported by the board holding member 7
(FIG. 6).
[0123]
In contrast, in the fourth embodiment, the reinforcing
5 member 3 is supported by the stator 5 as illustrated in FIG. 13.
More specifically, the reinforcing member 3 is supported by a
plurality of protrusions 58 provided upright on the insulating
portion 52 of the stator 5. By attaching the reinforcing
member 3 onto the stator 5, the stator assembly 50C is formed.
10 [0124]
The motor of the fourth embodiment is configured in a
similar manner to the motor 1 of the first embodiment except
for the points described above. It is also possible to use the
reinforcing member 3A described in the second embodiment or the
15 reinforcing member 3B described in the third embodiment.
[0125]
The material of the reinforcing member 3B may be the same
as that of the reinforcing member 3 of the first embodiment or
may be the same as that of the reinforcing member 3A of the
20 second embodiment. In the fourth embodiment, the circuit board
6 and the board holding member 7 are not provided.
[0126]
By placing the stator assembly 50C in the mold 200 (FIG.
8) and performing molding, the stator 5 and the reinforcing
25 member 3 can be integrally molded with the mold resin part 40
(FIG. 1).
[0127]
In the fourth embodiment, the reinforcing member 3 is
supported directly by the stator 5. Thus, in addition to the
30 effects described in the first embodiment, the number of parts
can be decreased, and the manufacturing cost can be reduced.
[0128]
Fifth Embodiment
Next, a fifth embodiment will be described. FIG. 14 is a

29
sectional view illustrating a rotor 2D of the fifth embodiment.
The above-described rotor 2 (FIG. 2) of the above-described
first embodiment is of a consequent-pole type that has the
magnet magnetic poles and the virtual magnetic poles. In
5 contrast, the rotor 2D of the fifth embodiment is of a nonconsequent-pole type in which all the magnetic poles are formed
by magnet magnetic poles.
[0129]
The rotor 2D has a rotor core 21 having a cylindrical
10 shape about the axis C1. The rotor core 21 is formed of a
plurality of electromagnetic steel sheets which are stacked and
fixed together in the axial direction by crimping, welding, or
bonding. The sheet thickness of each electromagnetic steel
sheet is, for example, 0.1 mm to 0.7 mm. The rotor core 21 has
15 a central hole at its center in the radial direction, and the
shaft 11 is fixed to the center hole.
[0130]
The plurality of magnet insertion holes 22 is arranged in
the rotor core 21 at equal intervals in the circumferential
20 direction. The shape of each magnet insertion hole 22 is as
described in the first embodiment. The flux barrier 27 is
formed on each side of the magnet insertion hole 22 in the
circumferential direction. The number of magnet insertion
holes 22 is 10 in this example, but is not limited to 10.
25 [0131]
The magnet 23 is inserted in each magnet insertion hole
22. The magnet 23 is in the form of a flat plate and has a
rectangular shape in a plane orthogonal to the axial direction.
The material and shape of the magnet 23 are as described in the
30 first embodiment.
[0132]
The magnets 23 adjacent to each other in the
circumferential direction are arranged so that opposite
magnetic poles face the outer circumferential side of the rotor

30
core 21. Thus, all the magnetic poles of the rotor 2D are
formed by the magnets 23. In this example, the rotor 2D has 10
magnets 23, and the number of magnetic poles of the rotor 2D is
10.
5 [0133]
The non-consequent-pole rotor 2D has the magnets 23, the
number of which is greater than the number of magnets in the
consequent-pole rotor 2, but has an advantage that vibration
and noise are less likely to occur.
10 [0134]
The motor of the fifth embodiment is configured in a
similar manner to the motor 1 of the first embodiment except
for the points described above. It is also possible to use the
reinforcing member 3A described in the second embodiment or the
15 reinforcing member 3B described in the third embodiment. As
described in the fourth embodiment, the reinforcing member 3
may be supported by the stator 5.
[0135]
Even when the non-consequent-pole rotor 2D is used as
20 above, vibration and noise of the motor 1 can be reduced by
covering the stator 5 and the reinforcing member 3 with the
mold resin part 40 and by making the tensile strength of the
reinforcing member 3 higher than that of the mold resin part 40
or making the thermal conductivity of the reinforcing member 3
25 lower than that of the mold resin part 40.
[0136]
(Air Conditioner)
Next, an air conditioner to which the motor of each of
the above embodiments is applied will be described. FIG. 15(A)
30 is a diagram illustrating the configuration of an air
conditioner 500 to which the motor 1 of the first embodiment is
applied. The air conditioner 500 includes an outdoor unit 501,
an indoor unit 502, and a refrigerant pipe 503 connecting these
units 501 and 502.

31
[0137]
The outdoor unit 501 has an outdoor fan 510 which is, for
example, a propeller fan, a compressor 504, and a heat
exchanger 507. The outdoor fan 510 includes the impeller 505
5 and the motor 1 driving the impeller 505. The configuration of
the motor 1 is as described in the first embodiment.
[0138]
FIG. 15(B) is a sectional view of the outdoor unit 501.
The motor 1 is fixed to the frame 509 disposed in a housing 508
10 of the outdoor unit 501 by the screws 48. The impeller 505 is
attached to the shaft 11 of the motor 1 via a hub 506.
[0139]
In the outdoor fan 510, the rotation of the motor 1
causes the impeller 505 to rotate and blow air to the heat
15 exchanger 507. During a cooling operation of the air
conditioner 500, heat is released when the refrigerant
compressed by the compressor 504 is condensed in the heat
exchanger 507 (condenser), and this heat is released to the
outside of a room by air-blowing of the outdoor fan 510.
20 [0140]
The indoor unit 502 (FIG. 15(A)) has an indoor fan 520
which is, for example, a cross flow fan, and a heat exchanger
523. The indoor fan 520 has an impeller 521 and a motor 522
that drives the impeller 521.
25 [0141]
In the indoor fan 520, the rotation of the motor 522
causes the impeller 521 to rotate and blow air to the inside of
the room. During the cooling operation of the air conditioner
500, the refrigerant removes heat from the air as it evaporates
30 in the heat exchanger 523 (evaporator), and the air is blown
into the room by air-blowing of the indoor fan 520.
[0142]
Since vibration and noise is reduced in the motor 1
described in the above first embodiment, the quietness of the

32
outdoor fan 510 can be improved. Thus, the quietness of the
air conditioner 500 can be improved.
[0143]
Although the motor 1 of the first embodiment is used in
5 the outdoor fan 510 in this example, it is sufficient that the
motor 1 of the first embodiment is used in at least one of the
outdoor fan 510 and the indoor fan 520. Instead of the motor 1
of the first embodiment, the motor of any one of the second to
fifth embodiments may be used.
10 [0144]
The motor 1 described in each of the first to fifth
embodiments can be mounted on any electric apparatuses other
than the fan of the air conditioner.
[0145]
15 Although the desirable embodiments have been specifically
described, the present disclosure is not limited to the above
embodiments, and various modifications and changes can be made
thereto.
DESCRIPTION OF REFERENCE CHARACTERS
20 [0146]
1,1A motor; 2 rotor; 3, 3A, 3B reinforcing member; 4
mold stator; 5 stator; 6 circuit board; 7 board holding
member; 11 shaft; 21 rotor core; 30 main portion; 31
flange portion; 32 leg portion; 33 attachment portion; 35
25 surface; 36 recess; 38 attachment portion; 40 mold resin
part; 41 bearing support portion; 42 opening; 45
attachment leg; 46 attachment portion; 48 screw; 49
attachment portion; 50 stator assembly; 51 stator core; 52
insulating portion; 53 coil; 56 protrusion; 57 terminal;
30 58 protrusion (support portion); 61 drive circuit; 200
mold; 201 upper mold; 202 lower mold; 203 reinforcing
member housing; 204 cavity; 208 gate; 209 positioning pin;
210 contact surface; 500 air conditioner; 501 outdoor unit;
502 indoor unit; 503 refrigerant pipe; 505 impeller; 506

33
hub; 508 housing; 509 frame; 510 outdoor fan; 520 indoor
fan; 521 impeller.

34
We Claim:
1. A motor comprising:
5 a rotor;
a stator surrounding the rotor;
a reinforcing member; and
a mold resin part covering the stator and the reinforcing
member,
10 wherein a tensile strength of the reinforcing member is
higher than a tensile strength of the mold resin part.
2. The motor according to claim 1, wherein the reinforcing
member is formed of a metal.
15
3. A motor comprising:
a rotor;
a stator surrounding the rotor;
a reinforcing member; and
20 a mold resin part covering the stator and the reinforcing
member,
wherein an elastic modulus of the reinforcing member is
lower than an elastic modulus of the mold resin part.
25 4. The motor according to claim 3, wherein the reinforcing
member is formed of a rubber.
5. The motor according to any one of claims 1 to 4, wherein
a thermal conductivity of the reinforcing member is higher than
30 a thermal conductivity of the mold resin part.
6. The motor according to any one of claims 1 to 5, wherein
the mold resin part is formed of a nonmagnetic resin.

35
7. The motor according to any one of claims 1 to 6, wherein
the mold resin part is formed of a thermosetting resin.
8. The motor according to any one of claims 1 to 7, wherein
5 the reinforcing member is supported by the stator.
9. The motor according to any one of claims 1 to 7, further
comprising a support member provided between the stator and the
reinforcing member,
10 wherein the reinforcing member is supported by the
support member.
10. The motor according to any one of claims 1 to 9, wherein
the reinforcing member has a first portion covered with the
15 mold resin part and a second portion exposed from the mold
resin part.
11. The motor according to claim 10, wherein the second
portion has a surface parallel to a rotational axis of the
20 rotor.
12. The motor according to any one of claims 1 to 11, wherein
the mold resin part has a plurality of attachment portions,
each of which is a hole or a concave portion, at equal
25 distances from the rotational axis of the rotor, and
wherein the reinforcing member has a plurality of
attachment portions, each of which is a hole or a concave
portion, at equal distances from the rotational axis of the
rotor.
30
13. The motor according to claim 12, wherein each of the
plurality of attachment portions of the mold resin part has a
circular or arc-shaped inner circumferential surface, and
wherein each of the plurality of attachment portions of

36
the reinforcing member has a circular or arc-shaped inner
circumferential surface.
14. The motor according to any one of claims 1 to 13, wherein
5 the rotor has a rotor core and a permanent magnet attached to
the rotor core, and
wherein the permanent magnet forms a magnet magnetic pole,
and a part of the rotor core forms a virtual magnetic pole.
10 15. The motor according to any one of claims 1 to 14, wherein
the reinforcing member is disposed on one side of the stator in
a direction of the rotational axis of the rotor.
16. A fan comprising:
15 the motor according to any one of claims 1 to 15, and
an impeller rotated by the motor.
17. An air conditioner comprising:
an outdoor unit; and
20 an indoor unit connected to the outdoor unit via a
refrigerant pipe,
wherein at least one of the outdoor unit and the indoor
unit has the fan according to claim 16.