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 100-8310, JAPAN
THE FOLLOWING SPECIFICATION PARTICULARLY DESCRIBES THE INVENTION
AND THE MANNER IN WHICH IT IS TO BE PERFORMED
2
5 DESCRIPTION
TECHNICAL FIELD
[0001]
The present disclosure relates to a rotor of a motor.
10 BACKGROUND ART
[0002]
A consequent pole rotor including a first magnetic pole
portion having a first polarity and a second magnetic pole
portion having a second polarity and serving as a pseudo15 magnetic pole has been employed in order to reduce the amount
of permanent magnets used in a rotor for a motor. In a
consequent pole rotor described in Patent Reference 1, for
example, to increase an average magnetic flux density between a
stator and a rotor, an occupancy angle of the first magnetic
20 pole portion having a first polarity and an occupancy angle of
a second magnetic pole portion having a second polarity and
serving as a pseudo-magnetic pole are set.
PRIOR ART REFERENCE
25 PATENT REFERENCE
[0003]
Japanese Patent Application Publication No. 2004-201406
SUMMARY OF THE INVENTION
30 PROBLEM TO BE SOLVED BY THE INVENTION
[0004]
In the technique disclosed in Patent Reference 1, holes
in which permanent magnets are placed communicate with spaces
adjacent to the holes. This configuration reduces magnetic
35 flux leakage passing through regions between the holes in which
the permanent magnets are placed and the spaces. That is, the
configuration reduces magnetic flux leakage flowing from north
poles of the permanent magnets into south poles of the
3
5 permanent magnets. Conventional techniques, however, do not
consider magnetic flux leakage other than effective magnetic
flux flowing from a consequent pole rotor into target tooth of
a stator. That is, magnetic flux leakage flowing into a tooth
adjacent to the target tooth is not taken into consideration.
10 Thus, in the conventional techniques, even if a large permanent
magnet is disposed in the consequent pole rotor, magnetic flux
from the permanent magnet cannot be effectively used.
[0005]
It is therefore an object of the present disclosure to
15 increase effective magnetic flux flowing from a permanent
magnet of a consequent pole rotor into a target tooth of a
stator in order to reduce magnetic flux leakage flowing into
tooth adjacent to the target tooth.
20 MEANS OF SOLVING THE PROBLEM
[0006]
A motor according to an aspect of the present disclosure
includes:
a consequent pole rotor including a rotor core, a
25 permanent magnet, a first magnetic pole region, and a second
magnetic pole region, the rotor core having a first magnet
insertion hole and a second magnet insertion hole adjacent to
the first magnet insertion hole, the permanent magnet being
disposed in the first magnet insertion hole, the first magnetic
30 pole region functioning as a first magnetic pole, the second
magnetic pole region serving as a second magnetic pole, the
second magnetic pole being a pseudo-magnetic pole, the pseudomagnetic pole being formed of a part of the rotor core between
the first magnet insertion hole and the second magnet insertion
35 hole; and
a stator including a core back extending in a
circumferential direction, a first tooth extending from the
core back in a first radial direction of the consequent pole
4
5 rotor, and a second tooth adjacent to the first tooth, the
stator being disposed outside the consequent pole rotor,
wherein an inner wall of the first magnet insertion hole
facing inward in the first radial direction is in contact with
a surface of the permanent magnet, the surface facing outward
10 in the first radial direction, and
the motor satisfies W2 < W1 < M1, and T1 < W1 < T1 + 2 ×
T2, where M1 is a width of the surface of the permanent magnet
in a longitudinal direction of the permanent magnet in a plane
orthogonal to an axis direction of the consequent pole rotor,
15 W1 is a maximum width of a portion of the inner wall of the
first magnet insertion hole in the plane, the portion being in
contact with the surface of the permanent magnet, W2 is a
minimum width from the first magnet insertion hole to the
second magnet insertion hole in the plane, T1 is a width of a
20 first front end surface of the first tooth facing the rotor
core in a first direction orthogonal to the first radial
direction in the plane, and T2 is a width from the first front
end surface to a second front end surface of the second tooth
facing the rotor core in the first direction.
25 A motor according to another aspect of the present
disclosure includes: a consequent pole rotor including a rotor
core, a permanent magnet, a first magnetic pole region, and a
second magnetic pole region, the rotor core having a first
magnet insertion hole and a second magnet insertion hole
30 adjacent to the first magnet insertion hole, the permanent
magnet being disposed in the first magnet insertion hole, the
first magnetic pole region functioning as a first magnetic pole,
the second magnetic pole region serving as a second magnetic
pole, the second magnetic pole being a pseudo-magnetic pole,
35 the pseudo-magnetic pole being formed of a part of the rotor
core between the first magnet insertion hole and the second
magnet insertion hole; and
a stator including a core back extending in a
5
5 circumferential direction, a first tooth extending from the
core back in a first radial direction of the consequent pole
rotor, and a second tooth adjacent to the first tooth, the
stator being disposed outside the consequent pole rotor,
wherein an inner wall of the first magnet insertion hole
10 facing inward in the first radial direction is in contact with
a surface of the permanent magnet, the surface facing outward
in the first radial direction,
the motor satisfies θW2 < θW1 < θM1, and θT1 < θW1 < θT1
+ 2 × θT2, where M1 is a width of the surface of the permanent
15 magnet in a longitudinal direction of the permanent magnet in a
plane orthogonal to an axis direction of the consequent pole
rotor, W1 is a maximum width of a portion of the inner wall of
the first magnet insertion hole in the plane, the portion being
in contact with the surface of the permanent magnet, W2 is a
20 minimum width from the first magnet insertion hole to the
second magnet insertion hole in the plane, T1 is a width of a
first front end surface of the first tooth facing the rotor
core in a first direction orthogonal to the first radial
direction in the plane, T2 is a width from the first front end
25 surface to a second front end surface of the second tooth
facing the rotor core in the first direction, θW1 is an angle
at which two lines respectively passing through two points
forming the maximum width W1 intersect at a rotation center of
the consequent pole rotor in the plane, θW2 is an angle at
30 which two lines respectively passing through two points forming
the minimum width W2 intersect at the rotation center in the
plane, θM1 is an angle at which two lines respectively passing
through two points forming the width M1 intersect at the
rotation center, θT1 is an angle at which two lines
35 respectively passing through two points forming the width T1
intersect at the rotation center in the plane, and θT2 is an
angle at which two lines respectively passing through two
points forming the width T2 intersect at the rotation center in
6
5 the plane.
A fan according to another aspect of the present
disclosure includes: a blade; and the motor configured to drive
the blade.
An air conditioner according to another aspect of the
10 present disclosure includes: an indoor unit; and an outdoor
unit connected to the indoor unit, wherein one or both of the
indoor unit and the outdoor unit include the motor.
EFFECTS OF THE INVENTION
15 [0007]
According to the present disclosure, effective magnetic
flux flowing from the permanent magnet of the consequent pole
rotor into a target tooth of the stator is increased, and
magnetic flux leakage flowing into a tooth adjacent to the
20 target tooth can be reduced.
BRIEF DESCRIPTION OF THE DRAWINGS
[0008]
FIG. 1 is a partial cross-sectional view schematically
25 illustrating a structure of a motor according to a first
embodiment.
FIG. 2 is a cross-sectional view schematically
illustrating the structure of the motor.
FIG. 3 is a cross-sectional view schematically
30 illustrating a structure of a rotor.
FIG. 4 is a cross-sectional view schematically
illustrating the structure of the rotor.
FIG. 5 is a diagram illustrating a part of the motor
shown in FIG. 2.
35 FIG. 6 is a diagram illustrating the motor shown in FIG.
5.
FIG. 7 is a cross-sectional view illustrating a motor
according to a comparative example.
7
5 FIG. 8 is a graph showing a relationship between a
cogging torque occurring in a motor and a ratio of a width of a
space facing a second front end surface to a width of a first
front end surface.
FIG. 9 is a graph showing a relationship between the
10 cogging torque and the ratio of the width of the space facing
the second front end surface to the width of the first front
end surface, and a relationship between a torque of the motor
and the ratio of the width of the space facing the second front
end surface to the width of the first front end surface.
15 FIG. 10 is a graph showing a relationship between the
cogging torque and a ratio θFB2/θT1 of an angle θFB2
corresponding to a width FB2 to an angle θT1 corresponding to a
width T1, and a relationship between a torque of a motor 1 and
the ratio θFB2/θT1 of the angle θFB2 corresponding to the width
20 FB2 to the angle θT1 corresponding to the width T1.
FIG. 11 is a diagram schematically illustrating a
structure of a fan according to a second embodiment.
FIG. 12 is a diagram schematically illustrating a
configuration of an air conditioner according to a third
25 embodiment.
FIG. 13 is a diagram schematically illustrating main
components in an outdoor unit as an air blower of the air
conditioner.
30 MODE FOR CARRYING OUT THE INVENTION
[0009]
FIRST EMBODIMENT
A motor 1 according to a first embodiment will be
described.
35 In an xyz orthogonal coordinate system shown in each
drawing, a z-axis direction (z axis) represents a direction
parallel to an axis Ax of the motor 1, an x-axis direction (x
axis) represents a direction orthogonal to the z-axis direction
8
5 (z axis), and a y-axis direction (y axis) represents a
direction orthogonal to both the z-axis direction and the xaxis direction. The axis Ax is a rotation center of a rotor 2,
that is, a rotation axis of the rotor 2. The direction
parallel to the axis Ax will also be referred to as an “axis
10 direction of the rotor 2” or simply an “axis direction.” The
radial direction refers to a direction of a radius of the rotor
2 or a stator 3, and is a direction orthogonal to the axis Ax.
An xy plane is a plane orthogonal to the axis direction. An
arrow D1 represents a circumferential direction about the axis
15 Ax. A circumferential direction of the rotor 2 or the stator 3
will also be simply referred to as a “circumferential
direction.”
[0010]

20 FIG. 1 is a partial cross-sectional view schematically
illustrating a structure of the motor 1 according to the first
embodiment.
FIG. 2 is a cross-sectional view schematically
illustrating the structure of the motor 1.
25 The motor 1 includes the rotor 2, the stator 3, a circuit
board 4, a molding resin 5, and bearings 7a and 7b for
rotatably retaining the rotor 2. The motor 1 is, for example,
a permanent magnet synchronous motor such as an interior
permanent magnet motor (IPM motor).
30 [0011]

The stator 3 is disposed outside the rotor 2. The stator
3 includes a stator core 31, a coil 32, and an insulator 33.
The stator core 31 is a ring-shaped core including a core back
35 31a extending in the circumferential direction and a plurality
of teeth 31b extending from the core back 31a in the radial
direction.
[0012]
9
5 The stator core 31 is constituted by, for example, a
plurality of thin iron magnetic sheets. In this embodiment,
the stator core 31 is constituted by a plurality of
electromagnetic steel sheets stacked in the axis direction.
Each of the electromagnetic steel sheets of the stator core 31
10 has a thickness of 0.2 mm to 0.5 mm, for example.
[0013]
The coil 32 (i.e., winding) is wound around the insulator
33 attached to the stator core 31. The coil 32 is insulated by
the insulator 33. The coil 32 is made of a material containing
15 copper or aluminium, for example.
[0014]
The insulator 33 is made of, for example, an insulative
resin such as polybutylene terephthalate (PBT), polyphenylene
sulfide (PPS), liquid crystal polymer (LCP), or polyethylene
20 terephthalate (PET). The resin insulator 33 is, for example,
an insulating film having a thickness of 0.035 mm to 0.4 mm.
[0015]
For example, the insulator 33 is shaped integrally with
the stator core 31. It should be noted that the insulator 33
25 may be shaped separately from the stator core 31. In this case,
after the insulator 33 has been shaped, the insulator 33 is
fitted in the stator core 31.
[0016]
In this embodiment, the stator core 31, the coil 32, and
30 the insulator 33 are covered with the molding resin 5. The
stator core 31, the coil 32, and the insulator 33 may be fixed
by a cylindrical shell made of a material containing iron, for
example. In this case, the stator 3 is covered with the
cylindrical shell by shrink fitting together with the rotor 2,
35 for example.
[0017]
The circuit board 4 is fixed by the molding resin 5
together with the stator 3. The circuit board 4 includes a
10
5 driving device for controlling the motor 1.
[0018]
The molding resin 5 unites the circuit board 4 and the
stator 3 to each other. The molding resin 5 is, for example, a
thermosetting resin such as a bulk molding compound (BMC) or an
10 epoxy resin.
[0019]

FIGS. 3 and 4 are cross-sectional views schematically
illustrating a structure of the rotor 2. In FIG. 3, “N”
15 represents a north pole of the rotor 2 (specifically a north
pole functioning to the stator 3), and “S” represents a south
pole of the rotor 2 (specifically a south pole functioning to
the stator 3).
The rotor 2 includes a rotor core 21, a plurality of
20 permanent magnets 22, a shaft 23, and a nonmagnetic member 24.
The rotor 2 is rotatably disposed inside the stator 3.
Specifically, the rotor 2 is disposed inside the stator 3 such
that the permanent magnets 22 face the stator 3. The rotation
axis of the rotor 2 coincides with the axis line Ax. An air
25 space is provided between the rotor core 21 and the stator 3.
[0020]
The rotor core 21 is constituted by a plurality of cores
210 stacked in the axis direction. The rotor core 21 (i.e.,
the plurality of cores 210) is fixed to nonmagnetic member 24.
30 The rotor core 21 may be fixed to the shaft 23. The shaft 23
is rotatably held by bearings 7a and 7b. When the motor 1 is
driven, the rotor core 21 rotates together with the shaft 23.
[0021]
In the axis direction, the rotor core 21 may be longer
35 than the stator core 31. Accordingly, magnetic flux from the
rotor 2 (specifically, the permanent magnets 22) efficiently
flows into the stator core 31.
[0022]
11
5 The rotor core 21 (i.e., the plurality of cores 210)
includes a plurality of magnet insertion holes 21a and a shaft
insertion hole 21b.
[0023]
In this embodiment, the rotor core 21 includes a
10 plurality of magnet insertion holes 21a, and at least one
permanent magnet 22 is disposed in each of the magnet insertion
holes 21a.
[0024]
The rotor core 21 is constituted by, for example, a
15 plurality of electromagnetic steel sheets. In this case, each
of the plurality of cores 210 is an electromagnetic steel sheet.
The plurality of cores 210 may include cores other than
electromagnetic steel sheets. For example, the rotor core 21
may be constituted by a plurality of iron cores each having a
20 predetermined shape or may be constituted by a mixture of a
soft magnetic material and a resin.
[0025]
Each of the cores 210 of the rotor core 21 has a
thickness of 0.2 mm to 0.5 mm, for example. The cores 210 of
25 the rotor core 21 are stacked in the axis direction.
[0026]
The plurality of magnet insertion holes 21a are formed at
regular intervals in the circumferential direction of the rotor
core 21. In this embodiment, five magnet insertion holes 21a
30 are disposed in the rotor core 21. Each of the magnet
insertion holes 21a includes a magnet placement portion 21c in
which at least one permanent magnet 22 is placed, and two
spaces 21d communicating with the magnet placement portion 21c
in the longitudinal direction of the permanent magnet 22.
35 [0027]
The shaft insertion hole 21b is disposed in a center
portion of the rotor core 21. The shaft insertion hole 21b
penetrates the rotor core 21 in the axis direction. The shaft
12
5 23 is disposed in the shaft hole 21b.
[0028]
The rotor 2 is a consequent pole rotor. Specifically,
the rotor 2 includes a first magnetic pole formed of each
permanent magnet 22 and a second magnetic pole that is a
10 pseudo-magnetic pole formed of a part of the rotor core 21
between two adjacent magnet insertion holes 21a. That is, the
second magnetic pole is a pseudo-magnetic pole formed of a part
of the rotor core 21 adjacent to each magnet insertion hole 21a
in the circumferential direction of the rotor core 21.
15 [0029]
As illustrated in FIG. 4, the rotor core 2 includes a
plurality of first magnetic pole regions N1 and a plurality of
second magnetic pole regions S1. Each of the first magnetic
pole regions N1 is a region including at least a part of the
20 permanent magnet 22 and at least a part of the magnet insertion
hole 21a in the xy plane. Specifically, each first magnetic
pole region N1 is a region between two lines passing through
both ends of a surface 22a of the permanent magnet 22a in
contact with an inner wall 211a of the magnet insertion hole
25 21a facing inward in the radial direction and the rotation
center of the rotor in the xy plane. Each of the second
magnetic pole regions S1 is a region between two lines passing
through one end of each of two adjacent magnet insertion holes
21a and the rotation center of the rotor 2 in the xy plane.
30 That is, each second magnetic pole region S1 is a region not
including any of the magnet insertion hole 21a and the
permanent magnet 22.
[0030]
A region between each of the first magnetic pole region
35 N1 and its adjacent second magnetic pole region S1 is an interpole region.
[0031]
Each of the permanent magnets 22 forms a north pole as
13
5 the first magnetic pole of the rotor 2. A part of the rotor
core 21 adjacent to each magnet insertion hole 21a in the
circumferential direction of the rotor core 21 forms a south
pole as the second magnetic pole that is a pseudo-magnetic pole
of the rotor 2. In this case, each of the first magnetic pole
10 regions N1 functions as the first magnetic pole (magnetic pole
serving as a north pole to the stator 3 in this embodiment),
and each of the second magnetic pole regions S1 functions as
the second magnetic pole (pseudo-magnetic pole serving as a
north pole to the stator 3 in this embodiment). In other words,
15 each of the first magnetic pole regions N1 functions as a first
polarity, and each of the second magnetic pole regions S1
functions as a second polarity different from the first
polarity.
[0032]
20 The number of permanent magnets 22 is half of the number
n (where n is an even number greater than or equal to four) of
magnetic poles of the rotor 2. The number n of magnetic poles
of the rotor 2 is the sum of the number of magnetic poles
functioning as north poles to the stator 3 and the number of
25 magnetic poles functioning as south poles to the stator 3. The
north poles and the south poles of the rotor 2 are alternately
arranged in the circumferential direction of the rotor 2. In
this embodiment, n = 10.
[0033]
30 The shaft 23 is fixed to the rotor core 21 with the
nonmagnetic member 24, for example. The nonmagnetic member 24
is disposed in the shaft insertion hole 21b. The nonmagnetic
member 24 couples the shaft 23 to the rotor core 21.
[0034]
35 The nonmagnetic member 24 is made of, for example, a nonmagnetic material such as austenitic stainless steel, aluminium,
a bulk molding compound (BMC), polybutylene terephthalate (PBT),
polyphenylene sulfide (PPS), liquid crystal polymer (LCP), or
14
5 polyethylene terephthalate (PET).
[0035]
The nonmagnetic member 24 is, for example, a resin. In
this case, the nonmagnetic member 24 is made of a non-magnetic
resin such as a bulk molding compound (BMC), polybutylene
10 terephthalate (PBT), polyphenylene sulfide (PPS), liquid
crystal polymer (LCP), polyethylene terephthalate (PET).
[0036]
Each permanent magnet 22 is, for example, a flat-plate
permanent magnet. Each permanent magnet 22 may be, for example,
15 a rare earth magnet containing neodymium or samarium. The
permanent magnets 22 may be ferrite magnets containing iron.
The type of the permanent magnet 22 is not limited to the
example of this embodiment, and the permanent magnet 22 may be
made of another material.
20 [0037]
The permanent magnets 22 in the magnet insertion holes
21a are magnetized in the radial direction and consequently
magnetic flux from the permanent magnets 22 flows into the
stator 3.
25 [0038]
FIG. 5 is a diagram illustrating a part of the motor 1
shown in FIG. 2.
In FIG. 5, the intermediate magnet insertion hole of the
three magnet insertion holes will be referred to as a “first
30 magnet insertion hole 211,” the right magnet insertion hole of
the three magnet insertion holes will be referred to as a
“second magnet insertion hole 212,” and the left magnet
insertion hole of the three magnet insertion holes will be
referred to as a “third magnet insertion hole 213.” That is,
35 in the xy plane, the second magnet insertion hole 212 and the
third magnet insertion hole 213 are adjacent to the first
magnet insertion hole 211.
[0039]
15
5 As described with reference to FIG. 4, in the rotor core
21 illustrated in FIG. 5, regions in contact with the permanent
magnets 22 are the first magnetic pole regions N1 functioning
as first magnetic poles. In the rotor core 21 illustrated in
FIG. 5, a region between each first magnet insertion hole 211
10 and its adjacent second magnet insertion hole 212 is the second
magnetic pole region S1 functioning as a second magnetic pole
that is a pseudo-magnetic pole.
[0040]
In FIG. 5, a tooth facing the first magnet insertion hole
15 211 will be referred to as a “first tooth 311,” a tooth on the
right side with respect to the first tooth 311 will be referred
to as a “second tooth 312,” and a tooth on the left side with
respect to the first tooth 311 will be referred to as a “third
tooth 313.” That is, in the xy plane, the second tooth 312 and
20 the third tooth 313 are adjacent to the first tooth 311.
[0041]
Each tooth 31b has a front end surface facing the rotor
core 21. In the example illustrated in FIG. 5, the first tooth
311 has a front end surface 311a facing the rotor core 21, the
25 second tooth 312 has a front end surface 312a facing the rotor
core 21, and the third tooth 313 has a front end surface 313a
facing the rotor core 21. The front end surface 311a of the
first tooth 311 will also be referred to as a “first front end
surface 311a,” the front end surface 312a of the second tooth
30 312 will also be referred to as a “second front end surface
312a,” and the front end surface 313a of the third tooth 313
will also be referred to as a “third front end surface 313a.”
[0042]
In the xy plane illustrated in FIG. 5, a direction in
35 which the first tooth 311 extends will also be referred to as a
“first radial direction,” a direction in which the second tooth
312 extends will also be referred to as a “second radial
direction,” and a direction in which the third tooth 313
16
5 extends will also be referred to as a “third radial direction.”
[0043]
In the xy plane, a magnetic pole center line C1
indicating the center of the first magnetic pole passes through
the center of the permanent magnet 22. As illustrated in FIG.
10 5, in the xy plane, the magnetic pole center line C1 passing
through the magnetic pole center of the first magnetic pole
coincides with a first radial direction. In this case, the
first magnet insertion hole 211 faces the first tooth 311.
[0044]
15 One of the two spaces 21d of each magnet insertion hole
21a faces the second tooth 312, and the other space 21d faces
the third tooth 313.
[0045]
The inner wall 211a of the first magnet insertion hole
20 211 facing inward in the first radial direction is in contact
with the surface 22a of the permanent magnet 22 facing outward
in the first radial direction.
[0046]
A width M1 is a width of the surface 22a in the
25 longitudinal direction of the permanent magnet 22 in the xy
plane. In the example illustrated in FIG. 5, the width M1 is a
width of the surface 22a in a first direction orthogonal to the
magnetic pole center line C1.
[0047]
30 In the xy plane, the width W1 is a maximum width of a
portion of the inner wall 211a of the first magnet insertion
hole 211 in contact with the surface 22a of the permanent
magnet 22. In this embodiment, the width M1 and the width W1
have a relationship of W1 < M1.
35 [0048]
In the xy plane, the width W2 is a minimum width from the
first magnet insertion hole 211 to the second magnet insertion
hole 212.
17
5 [0049]
A width T1 is a width of the first front end surface 311a
of the first tooth 311 in the first direction orthogonal to the
first radial direction in the xy plane. As described above, in
FIG. 5, the first direction is also a direction orthogonal to
10 the magnetic pole center line C1.
[0050]
A width T2 is a width from the first front end surface
311a to the second front end surface 312a in the first
direction. A width T3 is a width from the first front end
15 surface 311a to the third front end surface 313a in the first
direction. In this embodiment, T2 = T3. A width from the
second front end surface 312a to the third front end surface
313a in the first direction is T2 + T1 + T3 = T1 + 2 × T2.
[0051]
20 In the example illustrated in FIG. 5, the motor 1
satisfies W2 < W1 < M1, and T1 < W1 < T1 + 2 × T2.
[0052]
With respect to the space 21d facing the second tooth 312,
a width FB1 is a width of this space 21d in a second direction
25 orthogonal to the second radial direction in the xy plane.
With respect to the space 21d facing the second tooth 312, a
width FB2 is a width of a portion of this space 21d facing the
second front end surface 312a in a second direction orthogonal
to the second radial direction in the xy plane. In the example
30 illustrated in FIG. 5, with respect to the space 21d facing the
second tooth 312, the width FB1 and the width FB2 has a
relationship of FB1 > FB2.
[0053]
Similarly, with respect to the space 21d facing the third
35 tooth 313, a width FB3 is a width of this space 21d in a third
direction orthogonal to the third radial direction in the xy
plane. With respect to the space 21d facing the third tooth
313, a width FB4 is a width of a portion of this space 21d
18
5 facing the third front end surface 313a in the third direction
orthogonal to the tooth radial direction in the xy plane. In
the example illustrated in FIG. 5, with respect to the space
21d facing the third tooth 313, the width FB3 and the width FB4
has a relationship of FB3 > FB4.
10 [0054]
In this embodiment, the width FB1 of the space 21d facing
the second tooth 312 is equal to the width of the FB3 of the
space 21d facing the third tooth 313, and the width FB2 of the
space 21d facing the second front end surface 312a is equal to
15 the width FB4 of the space 21d facing the third front end
surface 313a.
[0055]
FIG. 6 is a diagram illustrating the motor 1 illustrated
in FIG. 5.
20 In the example illustrated in FIG. 6, the motor 1
satisfies θW2 < θW1 < θM1, and θT1 < θW1 < θT1 + 2 × θT2.
[0056]
The angles θW2, θW1, θM1, θT1, and θT2 represent angles
respectively corresponding to the widths W2, W1, M1, T1, and T2
25 shown in FIG. 5.
[0057]
Specifically, the angle θW2 is an angle at which two
lines respectively passing through the two points forming the
width W2 (i.e., both ends of the width W2) in the xy plane
30 intersect at the rotation center of the rotor 2. That is, the
angle θW2 is an angle formed by a line passing through one end
of the width W2 and the rotation center of the rotor 2 and a
line passing through the other end of the width W2 and the
rotation center of the rotor 2 in the xy plane.
35 [0058]
The angle θW1 is an angle at which two lines respectively
passing through the two points forming the width W1 in the xy
plane intersect at the rotation center of the rotor 2. That is,
19
5 the angle θW1 is an angle formed by a line passing through one
end of the width W1 and the rotation center of the rotor 2 and
a line passing through the other end of the width W1 and the
rotation center of the rotor 2 in the xy plane.
[0059]
10 The angle θM1 is an angle at which two lines respectively
passing through the two points forming the width M1 in the xy
plane intersect at the rotation center of the rotor 2. That is,
the angle θM1 is an angle formed by a line passing through one
end of the width M1 and the rotation center of the rotor 2 and
15 a line passing through the other end of the width M1 and the
rotation center of the rotor 2 in the xy plane.
[0060]
The angle θT1 is an angle at which two lines respectively
passing through the two points forming the width T1 in the xy
20 plane intersect at the rotation center of the rotor 2. That is,
the angle θT1 is an angle formed by a line passing through one
end of the width T1 and the rotation center of the rotor 2 and
a line passing through the other end of the width T1 and the
rotation center of the rotor 2 in the xy plane.
25 [0061]
The angle θT2 is an angle at which two lines respectively
passing through the two points forming the width T2 in the xy
plane intersect at the rotation center of the rotor 2. That is,
the angle θT2 is an angle formed by a line passing through one
30 end of the width T2 and the rotation center of the rotor 2 and
a line passing through the other end of the width T2 and the
rotation center of the rotor 2 in the xy plane.
[0062]
Similarly, the angle θFB2 represents an angle
35 corresponding to the width FB2 shown in FIG. 5. Specifically,
the angle θFB2 is an angle at which two lines respectively
passing through the two points forming the width FB2 in the xy
plane intersect at the rotation center of the rotor 2. That is,
20
5 the angle θFB2 is an angle formed by a line passing through one
end of the width FB2 and the rotation center of the rotor 2 and
a line passing through the other end of the width FB2 and the
rotation center of the rotor 2 in the xy plane.
[0063]
10
FIG. 7 is a cross-sectional view illustrating a motor 1a
according to a comparative example.
In the motor 1a according to the comparative example, a
rotor 2a is different from the rotor 2 of the motor 1 according
15 to the present embodiment. Specifically, the rotor 2a of the
motor 1a according to the comparative example is not a
consequent pole rotor, but a conventional interior permanent
magnet (IPM) rotor. Specifically, in the rotor 2a of the motor
1a according to the comparative example, permanent magnets 22
20 functioning as first magnets (e.g., north poles) to a stator 3
and permanent magnets 22 functioning as second magnetic poles
(e.g., south poles) to the stator 3 are alternately arranged in
the circumferential direction.
[0064]
25 In general, in an IPM rotor, as a width M1 of each
permanent magnet in a longitudinal direction increases, a
magnetic force of the permanent magnet increases, and thus an
output of the rotor increases. However, in a conventional
motor that is not a consequent pole rotor, the width M1 of each
30 permanent magnet in the longitudinal direction, specifically
the width of each permanent magnet in the circumferential
direction, is limited to L/n at maximum (L: circumference of
the rotor core, n: the number of magnetic poles).
[0065]
35 On the other hand, as shown in FIG. 5, the rotor 2 of the
motor 1 according to the present embodiment satisfies W2 < W1 <
M1. Thus, in the rotor 2 of the motor 1 according to the
present embodiment, the width M1 of each permanent magnet 22
21
5 forming the first magnetic pole can be made larger than that in
the comparative example. As a result, efficiency of the rotor
2 can be improved with a smaller number of permanent magnets 22
than the comparative example.
[0066]
10 As shown in FIG. 5, the motor 1 according to the
embodiment satisfies T1 < W1. Thus, in the example shown in
FIG. 5, it is possible to increase effective magnetic flux
flowing from the permanent magnet 22 to the first tooth 311
that is a target tooth.
15 [0067]
In a case where the width W1 is larger than T1 + 2 × T2,
magnetic flux from the permanent magnet 22 flows into a tooth
that is not the target tooth, and thus magnetic flux leakage
increases. In a case where the width W1 is larger than T1 + 2
20 × T2, in FIG. 5, for example, magnetic flux from the permanent
magnet 22 flows into the second tooth 312 and the third tooth
313, and thus magnetic flux leakage increases. As shown in FIG.
5, the motor 1 according to the embodiment satisfies W1 < T1 +
2 × T2. Thus, in the example shown in FIG. 5, it is possible
25 to reduce magnetic flux leakage flowing into the second tooth
312 and the third tooth 313 adjacent to the first tooth 311
that is a target tooth.
[0068]
The motor 1 according to the embodiment satisfies W2 < W1
30 < M1, and T1 < W1 < T1 + 2 × T2. Thus, effective magnetic flux
flowing from the permanent magnet 22 to the target tooth can be
increased, and thus magnetic flux leakage flowing into a tooth
adjacent to the target tooth can be reduced.
[0069]
35 When the width FB1 and the width FB2 satisfy FB1 > FB2,
magnetic flux leakage flowing from the permanent magnet 22
disposed in the first magnet insertion hole 211 into the second
tooth 312 can be reduced. Thus, effective magnetic flux
22
5 flowing from the permanent magnet 22 into the target tooth can
be increased, and magnetic flux leakage flowing into a tooth
adjacent to the target tooth can be reduced.
[0070]
FIG. 8 is a graph showing a relationship between a
10 cogging torque occurring in the motor 1 and a ratio FB2/T1 of
the width FB2 of the space 21d facing the second front end
surface 312a to the width T1 of the first front end surface
311a.
As shown in FIG. 8, the motor 1 preferably satisfies 0.14
15 < FB2/T1 < 0.34. This configuration can reduce a cogging
torque in the motor 1. As a result, vibrations and noise
caused by a cogging torque in the motor 1 can be reduced.
[0071]
FIG. 9 is a graph showing a relationship between a
20 cogging torque and a ratio FB2/T1 of the width FB2 of the space
21d facing the second front end surface 312a to the width T1 of
the first front end surface 311a, and a relationship between a
torque of the motor 1 and a ratio FB2/T1 of the width FB2 of
the space 21d facing the second front end surface 312a to the
25 width T1 of the first front end surface 311a. In FIG. 9, it is
assumed that the torque has a maximum value of 1.000.
As shown in FIG. 9, the motor 1 preferably satisfies
0.165 < FB2/T1 < 0.285. This configuration can reduce a
cogging torque in the motor 1 while maintaining a maximum
30 torque in the motor 1. As a result, it is possible to reduce
vibrations and noise caused by a cogging torque in the motor 1
while maintaining a maximum torque in the motor 1.
[0072]
As shown in FIG. 9, the motor 1 more preferably satisfies
35 0.175 < FB2/T1 < 0.24. This configuration can suppress a
decrease of the maximum torque of the motor 1 and can
effectively reduce a cogging torque in the motor 1. As a
result, a decrease of the maximum torque of the motor 1 can be
23
5 suppressed, and thus vibrations and noise caused by a cogging
torque in the motor 1 can be effectively reduced.
[0073]
As shown in FIG. 6, the motor 1 according to the
embodiment satisfies θW2 < θW1 < θM1, and θT1 < θW1 < θT1 + 2 ×
10 θT2. Thus, in the example shown in FIG. 6, effective magnetic
flux flowing from the permanent magnet 22 to the target tooth
can be increased, and magnetic flux leakage flowing into the
second tooth 312 and the third tooth 313 adjacent to the first
tooth 311 that is a target tooth can be reduced.
15 [0074]
FIG. 10 is a graph showing a relationship between a
cogging torque and a ratio θFB2/θT1 of an angle θFB2
corresponding to the width FB2 to an angle θT1 corresponding to
the width T1, and a relationship between a torque of the motor
20 1 and the ratio θFB2/θT1 of the angle θFB2 corresponding to the
width FB2 to the angle θT1 corresponding to the width T1. In
FIG. 10, it is assumed that the torque has a maximum value of
1.000.
As shown in FIG. 10, the motor 1 preferably satisfies
25 0.14 < θFB2/θT1 < 0.34. This configuration can reduce a
cogging torque in the motor 1. As a result, vibrations and
noise caused by a cogging torque in the motor 1 can be reduced.
[0075]
As shown in FIG. 10, the motor 1 preferably satisfies
30 0.165 < θFB2/θT1 < 0.285. This configuration can reduce a
cogging torque in the motor 1 while maintaining a maximum
torque in the motor 1. As a result, it is possible to reduce
vibrations and noise caused by a cogging torque in the motor 1
while maintaining a maximum torque in the motor 1.
35 [0076]
As shown in FIG. 10, the motor 1 more preferably
satisfies 0.175 < θFB2/θT1 < 0.24. This configuration can
suppress a decrease of the maximum torque of the motor 1 and
24
5 can effectively reduce a cogging torque in the motor 1. As a
result, a decrease of the maximum torque of the motor 1 can be
suppressed, and thus vibrations and noise caused by a cogging
torque in the motor 1 can be effectively reduced.
[0077]
10 SECOND EMBODIMENT
FIG. 11 is a diagram schematically illustrating a
structure of a fan 60 according to a second embodiment.
The fan 60 includes a blade 61 and a motor 62. The fan
60 is also referred to as an air blower. The motor 62 is the
15 motor 1 according to the first embodiment. The blade 61 is
fixed to a shaft of the motor 62. The motor 62 drives the
blades 61. Specifically, the motor 62 causes the blades 61 to
rotate. When the motor 62 is driven, the blades 61 rotate to
generate an airflow. In this manner, the fan 60 is capable of
20 sending air.
[0078]
In the fan 60 according to the second embodiment, the
motor 1 described in the first embodiment is applied to the
motor 62, and thus, the same advantages as those described in
25 the first embodiment can be obtained. In addition, a decrease
in efficiency of the fan 60 can be prevented.
[0079]
THIRD EMBODIMENT
An air conditioner 50 (also referred to as a
30 refrigeration air conditioning apparatus or a refrigeration
cycle apparatus) according to a third embodiment will be
described.
FIG. 12 is a diagram schematically illustrating a
configuration the air conditioner 50 according to the third
35 embodiment.
FIG. 13 is a diagram schematically illustrating main
components in an outdoor unit 53 as an air blower of the air
conditioner 50.
25
5 [0080]
The air conditioner 50 according to the third embodiment
includes an indoor unit 51 as an air blower (first air blower),
a refrigerant pipe 52, and an outdoor unit 53 as an air blower
(second air blower) connected to the indoor unit 51. For
10 example, the outdoor unit 53 is connected to the indoor unit 51
through a refrigerant pipe 52.
[0081]
The indoor unit 51 includes a motor 51a (e.g., the motor
1 according to the first embodiment), an air blowing unit 51b
15 that supplies air when being driven by the motor 51a, and a
housing 51c covering the motor 51a and the air blowing unit 51b.
The air blowing unit 51b includes, for example, blades 51d that
are driven by the motor 51a. For example, the blades 51d are
fixed to a shaft of the motor 51a, and generate an airflow.
20 [0082]
The outdoor unit 53 includes a motor 53a (e.g., the motor
1 according to the first embodiment), an air blowing unit 53b,
a compressor 54, a heat exchanger (not shown), and a housing
53c covering the air blowing unit 53b, the compressor 54, and
25 the heat exchanger. When the air blowing unit 53b is driven by
the motor 53a, the air blowing unit 53b supplies air. The air
blowing unit 53b includes, for example, blades 53d that are
driven by the motor 53a. For example, the blades 53d are fixed
to a shaft of the motor 53a, and generate an airflow. The
30 compressor 54 includes a motor 54a (e.g., the motor 1 according
to the first embodiment), a compression mechanism 54b (e.g., a
refrigerant circuit) that is driven by the motor 54a, and a
housing 54c covering the motor 54a and the compression
mechanism 54b.
35 [0083]
In the air conditioner 50, at least one of the indoor
unit 51 or the outdoor unit 53 includes the motor 1 described
in the first embodiment. That is, one or both of the indoor
26
5 unit 51 and the outdoor unit 53 includes the motor 1 described
in the first embodiment. Specifically, as a driving source of
an air blowing unit, the motor 1 described in the first
embodiment is applied to at least one of the motors 51a or 53a.
That is, the motor 1 described in the first embodiment is
10 applicable to one or both of the indoor unit 51 and the outdoor
unit 53. The motor 1 described in the first embodiment may be
applied to the motor 54a of the compressor 54.
[0084]
The air conditioner 50 is capable of performing air
15 conditioning such as a cooling operation of sending cold air
and a heating operation of sending warm air from the indoor
unit 51, for example. In the indoor unit 51, the motor 51a is
a driving source for driving the air blowing unit 51b. The air
blowing unit 51b is capable of sending conditioned air.
20 [0085]
As illustrated in FIG. 13, in the outdoor unit 53, the
motor 53a is fixed to the housing 53c of the outdoor unit 53 by
screws 53e, for example.
[0086]
25 In the air conditioner 50 according to the third
embodiment, the motor 1 described in the first embodiment is
applied to at least one of the motors 51a or 53a, and thus, the
same advantages as those described in the first embodiment can
be obtained. As a result, a decrease in efficiency of the air
30 conditioning apparatus 50 can be prevented.
[0087]
Furthermore, with the use of the motor 1 according to the
first embodiment as a driving source of an air blower (e.g.,
the indoor unit 51), the same advantages as those described in
35 the first embodiment can be obtained. As a result, a decrease
in air blower efficiency can be prevented. The blower
including the motor 1 according to the first embodiment and the
blades (e.g., the blades 51d or 53d) driven by the motor 1 can
27
5 be used alone as a device for supplying air. This blower is
also applicable to equipment other than the air conditioner 50.
[0088]
Furthermore, in the case of using the motor 1 according
to the first embodiment as a driving source of the indoor unit
10 54, the same advantages as those described in the first
embodiment can be obtained. As a result, a decrease in
efficiency of the compressor 54 can be prevented.
[0089]
The motor 1 described in the first embodiment can be
15 mounted on equipment including a driving source, such as a
ventilator, a household electrical appliance, or a machine tool,
as well as the air conditioner 50.
[0090]
Features of the embodiments described above can be
20 combined as appropriate.
DESCRIPTION OF REFERENCE CHARACTERS
[0091]
1, 51a, 53a, 62 motor, 2 rotor, 3 stator, 21 rotor core,
25 21a magnet insertion hole, 21b shaft insertion hole, 22
permanent magnet, 24 nonmagnetic member, 50 air conditioner, 51
indoor unit, 53 outdoor unit, 60 fan, 61 blade, 210 core, 311
first tooth, 312 second tooth, 313 third tooth, 311a, 312a,
313a front end surface, N1 first magnetic pole region, S1
30 second magnetic pole region.
28
5 WE CLAIM:
1. A motor comprising:
a consequent pole rotor including a rotor core, a
permanent magnet, a first magnetic pole region, and a second
10 magnetic pole region, the rotor core having a first magnet
insertion hole and a second magnet insertion hole adjacent to
the first magnet insertion hole, the permanent magnet being
disposed in the first magnet insertion hole, the first magnetic
pole region functioning as a first magnetic pole, the second
15 magnetic pole region serving as a second magnetic pole, the
second magnetic pole being a pseudo-magnetic pole, the pseudomagnetic pole being formed of a part of the rotor core between
the first magnet insertion hole and the second magnet insertion
hole; and
20 a stator including a core back extending in a
circumferential direction, a first tooth extending from the
core back in a first radial direction of the consequent pole
rotor, and a second tooth adjacent to the first tooth, the
stator being disposed outside the consequent pole rotor,
25 wherein
an inner wall of the first magnet insertion hole facing
inward in the first radial direction is in contact with a
surface of the permanent magnet, the surface facing outward in
the first radial direction, and
30 the motor satisfies W2 < W1 < M1, and T1 < W1 < T1 + 2 ×
T2
where M1 is a width of the surface of the permanent
magnet in a longitudinal direction of the permanent magnet in a
plane orthogonal to an axis direction of the consequent pole
35 rotor,
W1 is a maximum width of a portion of the inner wall of
the first magnet insertion hole in the plane, the portion being
in contact with the surface of the permanent magnet,
29
5 W2 is a minimum width from the first magnet insertion
hole to the second magnet insertion hole in the plane,
T1 is a width of a first front end surface of the first
tooth facing the rotor core in a first direction orthogonal to
the first radial direction in the plane, and
10 T2 is a width from the first front end surface to a
second front end surface of the second tooth facing the rotor
core in the first direction.
2. The motor according to claim 1, wherein
15 the first magnet insertion hole includes a magnet
placement portion in which the permanent magnet is placed, and
a space communicating with the magnet placement portion and
facing the second tooth in the longitudinal direction of the
permanent magnet, and
20 in a case where a magnetic pole center line passing
through a magnetic pole center of the first magnetic pole
coincides with the first radial direction in the plane,
the motor satisfies 0.14 < FB2/T1 < 0.34
where FB2 is a width of a portion of the space facing the
25 second front end surface in a direction orthogonal to a second
radial direction in which the second tooth extends from the
core back in the plane.
3. The motor according to claim 1, wherein
30 the first magnet insertion hole includes a magnet
placement portion in which the permanent magnet is placed, and
a space communicating with the magnet placement portion in the
longitudinal direction of the permanent magnet, and
in a case where a magnetic pole center line passing
35 through a magnetic pole center of the first magnetic pole
coincides with the first radial direction in the plane,
the motor satisfies 0.165 < FB2/T1 < 0.285
where FB2 is a width of a portion of the space facing the
30
5 second front end surface in a direction orthogonal to a second
radial direction in which the second tooth extends from the
core back in the plane.
4. The motor according to claim 1, wherein
10 the first magnet insertion hole includes a magnet
placement portion in which the permanent magnet is placed, and
a space communicating with the magnet placement portion in the
longitudinal direction of the permanent magnet, and
in a case where a magnetic pole center line passing
15 through a magnetic pole center of the first magnetic pole
coincides with the first radial direction in the plane,
the motor satisfies 0.175 < FB2/T1 < 0.24
where FB2 is a width of a portion of the space facing the
second front end surface in a direction orthogonal to a second
20 radial direction in which the second tooth extends from the
core back in the plane.
5. A motor comprising:
a consequent pole rotor including a rotor core, a
25 permanent magnet, a first magnetic pole region, and a second
magnetic pole region, the rotor core having a first magnet
insertion hole and a second magnet insertion hole adjacent to
the first magnet insertion hole, the permanent magnet being
disposed in the first magnet insertion hole, the first magnetic
30 pole region functioning as a first magnetic pole, the second
magnetic pole region serving as a second magnetic pole, the
second magnetic pole being a pseudo-magnetic pole, the pseudomagnetic pole being formed of a part of the rotor core between
the first magnet insertion hole and the second magnet insertion
35 hole; and
a stator including a core back extending in a
circumferential direction, a first tooth extending from the
core back in a first radial direction of the consequent pole
31
5 rotor, and a second tooth adjacent to the first tooth, the
stator being disposed outside the consequent pole rotor,
wherein
an inner wall of the first magnet insertion hole facing
inward in the first radial direction is in contact with a
10 surface of the permanent magnet, the surface facing outward in
the first radial direction,
the motor satisfies θW2 < θW1 < θM1, and θT1 < θW1 < θT1
+ 2 × θT2
where M1 is a width of the surface of the permanent
15 magnet in a longitudinal direction of the permanent magnet in a
plane orthogonal to an axis direction of the consequent pole
rotor,
W1 is a maximum width of a portion of the inner wall of
the first magnet insertion hole in the plane, the portion being
20 in contact with the surface of the permanent magnet,
W2 is a minimum width from the first magnet insertion
hole to the second magnet insertion hole in the plane,
T1 is a width of a first front end surface of the first
tooth facing the rotor core in a first direction orthogonal to
25 the first radial direction in the plane,
T2 is a width from the first front end surface to a
second front end surface of the second tooth facing the rotor
core in the first direction,
θW1 is an angle at which two lines respectively passing
30 through two points forming the maximum width W1 intersect at a
rotation center of the consequent pole rotor in the plane,
θW2 is an angle at which two lines respectively passing
through two points forming the minimum width W2 intersect at
the rotation center in the plane,
35 θM1 is an angle at which two lines respectively passing
through two points forming the width M1 intersect at the
rotation center,
θT1 is an angle at which two lines respectively passing
32
5 through two points forming the width T1 intersect at the
rotation center in the plane, and
θT2 is an angle at which two lines respectively passing
through two points forming the width T2 intersect at the
rotation center in the plane.
10
6. The motor according to claim 5, wherein
the first magnet insertion hole includes a magnet
placement portion in which the permanent magnet is placed, and
a space communicating with the magnet placement portion and
15 facing the second tooth in the longitudinal direction of the
permanent magnet, and
in a case where a magnetic pole center line passing
through a magnetic pole center of the first magnetic pole
coincides with the first radial direction in the plane,
20 the motor satisfies 0.14 < θFB2/θT1 < 0.34
where FB2 is a width of a portion of the space facing the
second front end surface in a direction orthogonal to a second
radial direction in which the second tooth extends from the
core back in the plane, and
25 θFB2 is an angle at which two lines respectively passing
through two points forming the width FB2 intersect at the
rotation center in the plane.
7. The motor according to claim 5, wherein
30 the first magnet insertion hole includes a magnet
placement portion in which the permanent magnet is placed, and
a space communicating with the magnet placement portion in the
longitudinal direction of the permanent magnet, and
in a case where a magnetic pole center line passing
35 through a magnetic pole center of the first magnetic pole
coincides with the first radial direction in the plane,
the motor satisfies 0.165 < θFB2/θT1 < 0.285
where FB2 is a width of a portion of the space facing the
33
5 second front end surface in a direction orthogonal to a second
radial direction in which the second tooth extends from the
core back in the plane, and
θFB2 is an angle at which two lines respectively passing
through two points forming the width FB2 intersect at the
10 rotation center in the plane.
8. The motor according to claim 5, wherein
the first magnet insertion hole includes a magnet
placement portion in which the permanent magnet is placed, and
15 a space communicating with the magnet placement portion in the
longitudinal direction of the permanent magnet, and
in a case where a magnetic pole center line passing
through a magnetic pole center of the first magnetic pole
coincides with the first radial direction in the plane,
20 the motor satisfies 0.175 < θFB2/θT1 < 0.24
where FB2 is a width of a portion of the space facing the
second front end surface in a direction orthogonal to a second
radial direction in which the second tooth extends from the
core back in the plane, and
25 θFB2 is an angle at which two lines respectively passing
through two points forming the width FB2 intersect at the
rotation center in the plane.
9. The motor according to any one of claims 1 to 8, wherein
30 the first magnet insertion hole includes a magnet
placement portion in which the permanent magnet is placed, and
a space communicating with the magnet placement portion and
facing the second tooth in the longitudinal direction of the
permanent magnet, and
35 in a case where a magnetic pole center line passing
through a magnetic pole center of the first magnetic pole
coincides with the first radial direction in the plane,
the motor satisfies FB1 > FB2
34
5 where FB2 is a width of a portion of the space facing the
second front end surface in a direction orthogonal to a second
radial direction in which the second tooth extends from the
core back in the plane, and FB1 is a width of the space facing
the second tooth in the direction orthogonal to the second
10 radial direction in the plane.
10. A fan comprising:
a blade; and
the motor according to any one of claims 1 to 9 to drive
15 the blade.
11. An air conditioner comprising:
an indoor unit; and
an outdoor unit connected to the indoor unit, wherein
20 one or both of the indoor unit and the outdoor unit
include the motor according to any one of claims 1 to 9.