U.S. patent application number 15/593840 was filed with the patent office on 2018-05-03 for motor and method of manufacturing motor.
The applicant listed for this patent is NIDEC CORPORATION. Invention is credited to Yoshiki KAWAI, Yusuke MAKINO, Yoshinobu NAKAMURA, Yosuke YAMADA.
Application Number | 20180123433 15/593840 |
Document ID | / |
Family ID | 51620096 |
Filed Date | 2018-05-03 |
United States Patent
Application |
20180123433 |
Kind Code |
A1 |
NAKAMURA; Yoshinobu ; et
al. |
May 3, 2018 |
MOTOR AND METHOD OF MANUFACTURING MOTOR
Abstract
A motor may include a stator having coil groups of plural phases
and a connector, the stator comprising a plurality of split
stators. Each of the split stators may include a split core having
an arc-shaped core back section and a tooth section, an insulator,
a coil which has a lead-out line that is connected to the
connector. The insulator may have a first void extending between a
first inner wall and a first outer wall. The first inner wall may
have a lead-in groove. The stator may have a support ring disposed
on the upper side of the first void. The support ring may have a
second void extending between a second inner wall and a second
outer wall. A plurality of lead-out lines of different phases may
respectively accommodated in the first void and the second
void.
Inventors: |
NAKAMURA; Yoshinobu; (Kyoto,
JP) ; KAWAI; Yoshiki; (Kyoto, JP) ; MAKINO;
Yusuke; (Kyoto, JP) ; YAMADA; Yosuke; (Kyoto,
JP) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
NIDEC CORPORATION |
Kyoto |
|
JP |
|
|
Family ID: |
51620096 |
Appl. No.: |
15/593840 |
Filed: |
May 12, 2017 |
Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
|
|
14159037 |
Jan 20, 2014 |
9685844 |
|
|
15593840 |
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Current U.S.
Class: |
1/1 |
Current CPC
Class: |
H02K 15/026 20130101;
H02K 3/521 20130101; H02K 3/522 20130101; Y10T 29/49009 20150115;
H02K 3/52 20130101; H02K 3/50 20130101; H02K 2203/06 20130101; H02K
2203/09 20130101; H02K 3/38 20130101; H02K 3/28 20130101; H02K 3/46
20130101; H02K 15/12 20130101; H02K 2203/12 20130101 |
International
Class: |
H02K 15/02 20060101
H02K015/02; H02K 3/52 20060101 H02K003/52 |
Foreign Application Data
Date |
Code |
Application Number |
Mar 29, 2013 |
JP |
2013-074119 |
Claims
1. A motor comprising: a rotor that is supported so as to be able
to rotate around an axis of rotation; and a stator that is formed
into a cylindrical shape and having coil groups of plural phases
and a connector, the stator comprising a plurality of split
stators, wherein each of the split stators comprises: a split core
having an arc-shaped core back section configured to connect with
an arc-shaped core back section of another split core and a tooth
section which extends toward the inside in a radial direction from
the core back section, an insulator which covers the tooth section
and at least a portion of the core back section, a coil which has a
lead-out line that is connected to the connector, and is wound
around the tooth section with the insulator interposed
therebetween, and wherein the insulator has, at a portion which
covers an upper surface in an axial direction of the core back
section, a first inner wall which extends in a circumferential
direction, a first outer wall which is disposed further to the
outside in the radial direction than the first inner wall and
extends in the circumferential direction, and a first void which
extends in the circumferential direction between the first inner
wall and the first outer wall, the stator further has a support
ring which is disposed on the upper side in the axial direction of
the first void, the support ring has a bottom portion which extends
in the circumferential direction, a second inner wall which extends
in the circumferential direction on an upper surface in the axial
direction of the bottom portion, a second outer wall which is
disposed further to the outside in the radial direction than the
second inner wall and extends in the circumferential direction, and
a second void which extends in the circumferential direction
between the second inner wall and the second outer wall, a
plurality of lead-out lines of different phases is respectively
accommodated in the first void and the second void, wherein the
first void is filled with resin.
2. The motor according to claim 1, wherein the support ring has a
through-hole penetrating in the axial direction at the lower side
in the axial direction of the second void, the second void is
filled with resin, and the through-hole overlaps the first void in
the axial direction.
3. The motor according to claim 2, wherein at the same
circumferential position as the through-hole in the second void, a
width of the second void is made narrow further on the upper side
in the axial direction than the lead-out line accommodated in the
second void.
4. The motor according to claim 3, wherein the resin filled in the
first void and the resin filled in the second void are connected
through the through-hole.
5. The motor according to claim 1, wherein the support ring has a
leg portion which extends axially downward from a lower surface of
the bottom portion, and the leg portion is disposed in the first
void and immersed in the resin.
6. The motor according to claim 1, wherein the first inner wall has
a lead-in groove recessed toward the lower side in the axial
direction, at an upper surface in the axial direction, the lead-out
line which is accommodated in the first void is accommodated in the
first void through the lead-in groove from the coil.
7. The motor according to claim 1, wherein a distance between the
bottom portion and the first inner wall is smaller than a wire
diameter of the lead-out line.
Description
CROSS REFERENCE TO RELATED APPLICATION
[0001] This application is a continuation application of U.S.
patent application Ser. No. 14/159,037 filed on Jan. 20, 2014, the
entire contents of which are incorporated herein by reference and
claims priority to which is hereby claimed. application Ser. No.
14/159,037 application claimed the benefit of the date of the
earlier filed Japanese Application No. 2013-074119 filed Mar. 29,
2013, priority to which is also claimed herein, and the contents of
which are also incorporated by reference herein.
TECHNICAL FIELD
[0002] The present invention relates to a motor and a method of
manufacturing a motor.
BACKGROUND
[0003] In the past, in a case of forming a coil on each tooth
section of an annular stator core, in order to prevent a nozzle of
a winding machine from interfering with a coil formed on an
adjacent tooth, it has been necessary to provide a predetermined
gap between adjacent coils, and thus making it impossible to
improve the space factor of the coil.
[0004] On the other hand, in order to improve the space factor of
the coil, a method in which a split core is used is known. Since a
coil is formed on each tooth section in a state where a stator core
is divided, a concern that an adjacent coil and a nozzle of a
winding machine may come into contact with each other is
eliminated. As a result, since it is possible to reduce a gap that
is provided between adjacent coils, it is possible to improve the
space factor of the coil.
[0005] However, in a case where a coil is formed on a tooth of each
split core, a lead-out line is led out from each coil. As a result,
the work of connecting the lead-out line for each phase is
required. This work becomes very complicated because insulation
between the phases should also be secured while positioning and
fixing the lead-out line.
[0006] In order to reduce this complexity, for example, there is a
technique of reducing handling and connection of a conducting wire
by connecting each lead-out line to a plate-shaped bus bar.
However, if the bus bar is used, components increase.
[0007] Therefore, in a rotary electric machine of Japanese
Unexamined Patent Application Publication No. 2000-217293, routing
of a coil conducting wire by providing a first groove which is
opened radially outward and extends in an axial direction and a
second groove which is opened radially outward and extends in a
circumferential direction is devised. The coil conducting wire is
first led into the first groove from a coil end and subsequently
led to a wire connection position on a coil end periphery
determined for each phase, in the second groove which is different
for each phase. By putting the coil conducting wire in the groove,
fixation of the coil conducting wire in the work of treating an end
portion becomes easy, and thus workability is improved. Further,
since a separate groove is provided for each phase, securement of
insulation between the phases becomes easy.
[0008] [Patent Document] Japanese Unexamined Patent Application
Publication No. 2000-217293
[0009] However, in the rotary electric machine of Japanese
Unexamined Patent Application Publication No. 2000-217293, the
first groove is provided in order to prevent the conducting wires
of different phases from crossing each other. However, since a
plurality of second grooves is arranged in the axial direction, a
concern that the coil conducting wire which is led into the groove
on the lower side in the axial direction among the second grooves
may cross the coil conducting wire of another phase increases. In
order to reduce this concern, in the rotary electric machine of
Japanese Unexamined Patent Application Publication No. 2000-217293,
a hole penetrating a bottom portion of the first groove is
provided.
[0010] By passing the coil conducting wire through the hole, a
distance in which the coil conducting wire is led into the first
groove and then led to the second groove is shortened. For this
reason, a concern that the coil conducting wire which is led and
the coil conducting wire of another phase may cross each other is
reduced. Further, by passing the coil conducting wire through the
hole, movement of the coil conducting wire is suppressed from the
hole. In this way, a concern that the coil conducting wire may come
into contact with another member due to vibration, causing
dielectric breakdown, is also reduced.
[0011] However, the work of passing the coil conducting wire
through the hole is a very difficult process. Further, there is a
concern that a leading end of the coil conducting wire may be
damaged when passing the coil conducting wire through the hole.
SUMMARY
[0012] At least an embodiment of this application relates to a
motor having a rotor and a stator. The rotor is supported so as to
be able to rotate around an axis of rotation. The stator is formed
into a cylindrical shape by connecting a plurality of split
stators. Further, the stator has coil groups of plural phases and a
connector. The split stator has a core back section, a tooth
section, an insulator, and a coil. The core back sections have an
arc shape and are connected to each other. The tooth section
extends toward the inside in a radial direction from the core back
section. The insulator covers the tooth section and at least a
portion of the core back section. The coil has a lead-out line that
is connected to the connector, and is formed by being wound around
the tooth section with the insulator interposed therebetween. The
insulator has a first inner wall, a first outer wall, and a first
void. The first inner wall extends in a circumferential direction
at a portion which covers the upper surface in an axial direction
of the core back section. The first outer wall is disposed further
to the outside in the radial direction than the first inner wall
and extends in the circumferential direction. The first void
extends in the circumferential direction between the first inner
wall and the first outer wall. The first inner wall has a lead-in
groove recessed toward the lower side in the axial direction at the
upper surface in the axial direction. The stator further has a
support ring which is disposed on the upper side in the axial
direction of the first void. The support ring has a bottom portion,
a second inner wall, a second outer wall, and a second void. The
bottom portion extends in the circumferential direction. The second
inner wall extends in the circumferential direction on the upper
surface in the axial direction of the bottom portion. The second
outer wall is disposed further to the outside in the radial
direction than the second inner wall and extends in the
circumferential direction. The second void extends in the
circumferential direction between the second inner wall and the
second outer wall. A plurality of lead-out lines of different
phases is respectively accommodated in the first void and the
second void. The lead-out line which is accommodated in the first
void is accommodated in the first void through the lead-in groove
from the coil. The distance between the bottom portion of the
support ring and the first inner wall is smaller than the wire
diameter of the lead-out line.
[0013] According to at least an embodiment of this application, it
is possible to easily accommodate the lead-out line in each void
while securing insulation between the phases in the lead-out
lines.
BRIEF DESCRIPTION OF DRAWINGS
[0014] Embodiments will now be described, by way of example only,
with reference to the accompanying drawings which are meant to be
exemplary, not limiting, and wherein like elements are numbered
alike in several Figures, in which:
[0015] FIG. 1 is a vertical cross-sectional view of a motor
according to at least an embodiment.
[0016] FIG. 2 is a perspective view of a U-phase split stator in
the embodiment.
[0017] FIG. 3 is a top view of an insulator in the embodiment.
[0018] FIG. 4 is a perspective view of the U-phase split stator in
the embodiment.
[0019] FIG. 5 is a perspective view of a support ring in the
embodiment.
[0020] FIG. 6 is a partially enlarged perspective view of the
support ring in the embodiment.
[0021] FIG. 7 is a partially enlarged cross-sectional view of a
stator in the embodiment.
[0022] FIG. 8 is a partially enlarged cross-sectional view of the
stator in the embodiment.
[0023] FIG. 9 is a partially enlarged cross-sectional view of the
stator in the embodiment.
DETAILED DESCRIPTION
[0024] Hereinafter, an exemplary embodiment will be described
referring to the drawings. In addition, in this application, a
direction parallel to the central axis of a rotor is referred to as
an "axial direction", a direction perpendicular to the central axis
of the rotor is referred to as a "radial direction", and direction
along an arc centered on the central axis of the rotor is referred
to as a "circumferential direction". Further, in this application,
the shape or the positional relationship of each section will be
described with the axial direction set to be the up-and-down
direction. However, the definition of the up-and-down direction is
not intended to limit a direction when using a motor according to
the invention.
[0025] FIG. 1 is a vertical cross-sectional view of a motor 1
according to an exemplary embodiment. The motor 1 is mounted on a
vehicle as, for example, a motor for driving.
[0026] As shown in FIG. 1, the motor 1 includes a rotor 2, a stator
3, a housing 4, a bracket 5, a bearing 6, a support ring 7, and a
connector 8 (not shown). The rotor 2 has a rotor core 21, a magnet
22, and a shaft 23. The shaft 23 extends in the axial direction.
The rotor core 21 is fixed to the shaft 23. The magnet 22 is fixed
to the rotor core 21. The stator 3 faces the rotor 2 in the radial
direction and is fixed to the housing 4. The housing 4 has an
opening on the upper side in the axial direction and the bracket 5
blocks the opening. The housing 4 and the bracket 5 respectively
support the bearings 6. The bearings 6 support the shaft 23. The
bearings 6 support the shaft 23, whereby the rotor 2 is supported
so as to be able to rotate around an axis of rotation A1. Although
not specifically shown in the drawing, the connector 8 is
electrically connected to the stator 3 and disposed at a position
connected to an external power supply or the like.
[0027] The stator 3 is formed into a cylindrical shape by
connecting a plurality of split stators 32 and has coil groups 31
of plural phases.
[0028] As shown in FIG. 2, the split stator 32 has a split core
321, an insulator 322, and a coil 323. A U-phase coil 323 is formed
on the split stator 32 shown in FIG. 2. From here, the
configuration of the split stator 32 will be described using an
example of a U-phase split stator 32.
[0029] The split core 32 has a core back section 3212 and a tooth
section 3211. The core back sections 3212 each have an arc shape
and are connected to each other. The tooth section 3211 extends
further toward the inside in the radial direction than the core
back section 3212.
[0030] The insulator 322 covers the tooth section 3211 and a
portion of the core back section 3212.
[0031] The coil 323 is formed by being wound around the tooth
section 3211 with the insulator 322 interposed therebetween.
Further, the coil 323 has a U-phase lead-out line 3231.
[0032] The insulator 322 has a first inner wall 3221, a first outer
wall 3222, and a first void 3223 at the portion which covers the
upper surface in the axial direction of the core back section. The
first inner wall 3221 extends in the circumferential direction
further on the outside in the radial direction than the coil 323.
The first outer wall 3222 extends in the circumferential direction
further on the outside in the radial direction than the first inner
wall 3221. The first void 3223 extends in the circumferential
direction between the first inner wall 3221 and the first outer
wall 3222. When the respective split stators 32 are connected,
whereby the stator 3 having a cylindrical shape is formed, the
first voids 3223 are connected to each other, thereby forming an
annular void.
[0033] As shown in FIG. 3, the first inner wall 3221 has, at the
upper surface in the axial direction, a first lead-in groove 3224
and a second lead-in groove 3226, which are recessed toward the
lower side in the axial direction. The U-phase lead-out line 3231
is accommodated in the first void 3223 through the first lead-in
groove 3224 from the coil 323. After the respective split stators
32 are connected, the first void 3223 is filled with resin 9.
Further, the first inner wall 3221 has a protrusion portion 3228
which protrudes toward the outside in the radial direction, at a
site in which the first lead-in groove 3224 is not present. The
second lead-in groove 3226 is provided in the upper surface of the
protrusion portion 3228. Further, the dimension between the
protrusion portion 3228 and the first outer wall 3222 is larger
than the wire diameter of the U-phase lead-out line 3231.
[0034] The first outer wall 3222 has, at the upper surface in the
axial direction, a first lead-out groove 3225 and a second lead-out
groove 3227, which are recessed toward the lower side in the axial
direction. After the U-phase lead-out line 3231 is accommodated in
the first void 3223, the U-phase lead-out line 3231 passes the
annularly connected first void 3223 and is then led out radially
outward from the first void 3223 through the first lead-out groove
3225 of the split stator 32 closest to the connector 8. After the
U-phase lead-out line 3231 is introduced into the annular first
void 3223, the U-phase lead-out line 3231 is tensioned toward the
inside in the radial direction, thereby being in contact with the
radially outer surface of the first inner wall 3221, until it
approaches the first lead-out groove 3225. Further, the U-phase
lead-out line 3231 passes under the protrusion portion 3228.
[0035] A portion of the core back section 3212 is not covered by
the insulator 322. The first outer wall 3222 extends so as to form
the boundary between the portion of the core back section 3212
which is not covered by the insulator 322, and the first void
3223.
[0036] A V-phase coil 323 is formed on the split stator 32 shown in
FIG. 4. From hereon, the configuration of a V-phase split stator 32
will be described. However, with respect to the same configuration
as that of the U-phase split stator, description is omitted.
[0037] In the V-phase split stator 32, the coil 323 has a V-phase
lead-out line 3232. The V-phase lead-out line 3232 directly passes
over from the second lead-in groove 3226 to the second lead-out
groove 3227.
[0038] As shown in FIG. 1, the stator 3 further has the support
ring 7. The support ring 7 is disposed on the upper side in the
axial direction of the first void 3223.
[0039] As shown in FIG. 5, the support ring 7 has a bottom portion
71, a second inner wall 72, a second outer wall 73, a second void
74, an intermediate wall 76, and a third void 77.
[0040] The second inner wall 72 is a wall which rises in the axial
direction from the upper surface of the bottom portion 71 at the
radially inner side of the bottom portion 71, and extends in the
circumferential direction. The intermediate wall 76 is a wall which
rises in the axial direction from the upper surface of the bottom
portion 71 further on the outside in the radial direction than the
second inner wall 72, and extends in the circumferential direction.
The second outer wall 73 is a wall which rises in the axial
direction from the upper surface of the bottom portion 71 further
on the outside in the radial direction than the intermediate wall
76, and extends in the circumferential direction. The second void
74 extends in the circumferential direction between the second
inner wall 72 and the intermediate wall 76. The third void 77
extends in the circumferential direction between the intermediate
wall 76 and the second outer wall 73. The second void 74 and the
third void 77 are filled with the resin 9 after a lead-out line of
each phase (described later) is accommodated therein. In addition,
in this exemplary embodiment, a three-phase motor is described.
However, for example, if it is a two-phase motor, it is acceptable
if the second void 74 is provided between the second inner wall 72
and the second outer wall 73 and a lead-out line is accommodated
therein.
[0041] Further, the bottom portion 71 has a leg portion 711 and a
positioning portion 712. The leg portion 711 extends in the
circumferential direction from the lower surface of the bottom
portion. The positioning portion 712 extends in the circumferential
direction from the lower surface of the bottom portion 71 further
on the outside in the radial direction than the leg portion
711.
[0042] The second outer wall 73 has an outer groove 731 recessed
toward the inside in the radial direction, at the radially outer
surface. The vicinity of the outer groove 731 in the upper surface
in the axial direction of the second outer wall 73 is recessed in
the axial direction further than another portion of the second
outer wall 73.
[0043] As shown in FIG. 6, a through-hole 75 is formed in the
bottom portion 71. The through-hole 75 is disposed on the upper
side in the axial direction of the first void 3223. The second
inner wall 72 has a pressing portion 78 which protrudes radially
outward at the upper side in the axial direction of the
through-hole 75. Further, the intermediate wall 76 also likewise
has the pressing portion 78 which protrudes radially outward at the
upper side in the axial direction of the through-hole 75. A gap
which is smaller than the wire diameter of the lead-out line is
present between the pressing portion 78 and the wall portion that
faces it.
[0044] Further, the distance between the bottom portion 71 and the
first inner wall 3221 is smaller than the wire diameter of the
U-phase lead-out line 3231.
[0045] As shown in FIG. 7, the V-phase lead-out line 3232 is lead
out from the first void 3223 and then accommodated in the third
void 77 through the outer groove 731.
[0046] Further, a W-phase lead-out line 3233 (not shown) is led out
from the coil 323 and then directly accommodated in the second void
74 from the inside in the radial direction.
[0047] As shown in FIG. 8, the leg portion 711 is immersed in the
resin 9. Further, the upper surface of the first outer wall 3222
comes into contact with the lower surface of the bottom portion and
the first outer wall 3222 is disposed between the leg portion 711
and the positioning portion 712.
[0048] The motor 1 according to this exemplary embodiment has the
configuration described above, and next, a process of assembling
the stator 3 while assembling the motor 1 will be described.
[0049] First, the insulator 322 is mounted on the U-phase split
core 321 and the coil 323 is formed by being wound around the tooth
section 3211 with the insulator 322 interposed therebetween.
Thereafter, the U-phase lead-out line 3231 led out from the coil
323 is accommodated in the first void 3223 through the first
lead-in groove 3224. Next, the coil 323 is formed on the V-phase
split core 321, similar to the U-phase, and the V-phase lead-out
line 3231 led out from the coil 323 is accommodated in the first
void 3223 through the second lead-in groove 3226 and then led out
to the outside in the radial direction than the first void 3223
through the second lead-out groove 3227. Further, the coil 323 is
formed on the W-phase split core 321, similar to other phases.
However, the order for forming the split stators 32 of the
respective phases is not limited thereto.
[0050] After the coil 323 is formed on the split stator 32 of each
phase, the respective split cores are connected, thereby forming a
cylindrical stator. Thereafter, the U-phase lead-out line 3231
passes the first void 3223 and is then led out radially outward
from the first lead-out groove 3225 of the split stator 32 closest
to the connector 8.
[0051] Next, the resin 9 is filled in the annularly connected first
void 3223. Before the resin 9 is cured, the support ring is
disposed on the upper side in the axial direction of the first void
3223 such that the leg portion 711 is immersed in the resin 9.
[0052] In this state, the V-phase lead-out line 3232 is
accommodated in the third void 77 through the outer groove 731.
Further, the W-phase lead-out line 3233 is directly accommodated in
the second void 74 from the inside in the radial direction.
Thereafter, the second void 74 and the third void 77 are filled
with the resin 9 and the resin 9 is cured. In this way, the stator
3 of this embodiment is manufactured.
[0053] As described above, according to the motor 1 related to this
embodiment, since it is possible to dispose the support ring after
the U-phase lead-out line 3231 passes through the first lead-in
groove 3224, it is possible to easily accommodate the U-phase
lead-out line 3231 in the first void 3223. Further, since the
distance the bottom portion 71 and the first inner wall 3221 is
smaller than the wire diameter of the U-phase lead-out line 3231,
it is possible to suppress movement of the U-phase lead-out line at
the lead-in groove 3224 and the bottom portion 71. Further, since
the distance the bottom portion 71 and the first inner wall 3221 is
smaller than the wire diameter of the U-phase lead-out line 3231,
it is possible to prevent the U-phase lead-out line 3231 from
jumping out of the first void 3223 until the resin 9 in the first
void 3223 is cured, and therefore, the U-phase lead-out line 32231
can be prevented from being damaged.
[0054] Further, since the through-hole 75 is disposed on the upper
side in the axial direction of the first void 3223, even in a case
where the resin 9 filled in the second void 74 leaks from the
through-hole 75, it is possible to accommodate the U-phase lead-out
line 3231 in the first void 3223. For this reason, it is possible
to prevent resin stuck to an unintended place from peeling off due
to vibration or the like, thereby causing a defect.
[0055] Further, the second inner wall 72 has the pressing portion
which protrudes radially outward at the upper side in the axial
direction of the through-hole 75. Further, the intermediate wall 76
also likewise has the pressing portion 78 which protrudes radially
outward at the upper side in the axial direction of the
through-hole 75. A gap which is smaller than the wire diameter of
the lead-out line is present between the pressing portion 78 and
the wall portion which faces it. For this reason, it is possible to
prevent a lead-out line accommodated in a void from jumping out of
a void. Further, since there is the through-hole 75, it is possible
to mold a shape having a narrow width by a simple mold.
[0056] Further, as described above, the through-hole 75 is disposed
on the upper side in the axial direction of the first void 3223.
For this reason, as shown in FIG. 9, the resin 9 filled in the
second void 74 and the third void 77 and the resin 9 filled in the
first void 3223 are connected. For this reason, the rotation of the
support ring 7 with respect to the stator 3 is prevented.
[0057] Further, the support ring 7 has the leg portion 711 which
extends axially downward from the lower surface of the bottom
portion 71, and the leg portion 711 is disposed in the first void
3223 and immersed in resin. For this reason, the support ring 7 is
fixed solidly with respect to the stator 3.
[0058] Further, the U-phase lead-out line 3231 is led out to the
outside in the radial direction through the first lead-out groove
3225, and at least a portion of an opening on the upper side in the
axial direction of the first lead-out groove 3225 is covered by the
lower surface of the support ring. For this reason, movement of the
U-phase lead-out line 3231 is suppressed in the vicinity of the
first lead-out groove 3225, and thus damage to the U-phase lead-out
line 3231 can be suppressed.
[0059] Further, the V-phase lead-out line 3232 passes through the
second lead-in groove 3226 and the second lead-out groove 3227 and
is led out to the outside in the radial direction of the first void
3223. As a result, the V-phase lead-out line 3232 is disposed
between the second lead-in groove 3226 and the lower surface of the
support ring 7 and between the second lead-out groove 3227 and the
support ring 7 in the first void 3223. For this reason, movement of
the V-phase lead-out line 3232 is suppressed, and thus damage to
the V-phase lead-out line 3232 can be suppressed.
[0060] In addition, since the V-phase lead-out line 3232 is
accommodated in the third void 77 from the outside in the radial
direction and the W-phase lead-out line 3233 is accommodated in the
second void 74 from the inside in the radial direction, a structure
is made in which the V-phase lead-out line 3232 and the third void
77 do not cross each other. For this reason, each lead-out line can
be easily accommodated in each void, and thus it is possible to
obtain high reliability.
[0061] In addition, the first inner wall 3221 has the protrusion
portion 3228 which protrudes toward the outside in the radial
direction, at a site in which the first lead-in groove 3224 is not
present. Further, the U-phase lead-out line 3231 passes the lower
side in the axial direction of the protrusion portion 3228. For
this reason, contact of the U-phase lead-out line 3231 and the
V-phase lead-out line 3232 in the first void 3223 is
suppressed.
[0062] Further, a gap that is larger than the wire diameter of the
U-phase lead-out line 3231 is present between the protrusion
portion 3228 and the first outer wall 3222. For this reason, since
it is possible to dispose the U-phase lead-out line 3231 below the
protrusion portion 3228 through the gap, it becomes easy to dispose
the U-phase lead-out line 3231 below the protrusion portion
3228.
[0063] Further, since the V-phase lead-out line 3232 led out from
the second lead-out groove 3227 is accommodated in the third void
77 through the outer groove 731 recessed in the radial direction,
the V-phase lead-out line 3232 can be prevented from protruding
further to the outside in the radial direction than the support
ring 7.
[0064] Further, since the circumferential positions of the second
lead-in groove 3226 and the second lead-out groove 3227 are the
same, it becomes easy to dispose the V-phase lead-out line in each
groove.
[0065] Further, since the first outer wall 3222 is disposed between
the leg portion 711 and the positioning portion 712, the
positioning in the radial direction of the support ring becomes
easy.
[0066] Further, the first outer wall 3222 extends so as to form the
boundary between the portion of the core back section 3212 which is
not covered by the insulator 322, and the first void 3223. As a
result, the distance between the first outer wall 3222 and the
first inner wall 3221 becomes small. For this reason, movement of
the U-phase lead-out line 3231 accommodated in the first void 3223
can be suppressed.
[0067] The exemplary embodiment has been described above. However,
the invention is not limited to the above-described embodiment. For
example, in the exemplary embodiment described above, a
configuration has been described in which the U-phase lead-out line
is accommodated in the first void, the V-phase lead-out line is
accommodated in the third void, and the W-phase lead-out line is
accommodated in the second void. However, there is no particular
limitation to this combination, and which lead-out line is
accommodated in which void can be freely changed.
[0068] At least an embodiment of the invention can be used in a
motor.
[0069] While the description above refers to particular embodiments
of the present invention, it will be understood that many
modifications may be made without departing from the spirit
thereof. The accompanying claims are intended to cover such
modifications as would fall within the true scope and spirit of the
present invention.
[0070] The presently disclosed embodiments are therefore to be
considered in all respects as illustrative and not restrictive, the
scope of the invention being indicated by the appended claims,
rather than the foregoing description, and all changes which come
within the meaning and range of equivalency of the claims are
therefore intended to be embraced therein.
* * * * *