JP2009095184A - Dynamo-electric machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a dynamo-electric machine reducing cogging-torque pulsations due to a shrinkage-fit stress and being capable of suppressing vibrations and noises by changing the configuration of a projecting section as an abutting section formed onto the internal side face of a housing case or the external side face of a core. <P>SOLUTION: The dynamo-electric machine has an approximately cylindrical support section 12, the core 1 with a plurality of teeth 11 projected inward in the axial direction and the housing case 4. Projections 13 made in the direction of the housing case 4 or the direction of the core 1 and extended in the axial direction between both bases are formed on at least either of the external side face of the core 1 and the internal side face of the housing case 4, wherein the number of those projections is neither the divisor nor the multiple of the least common multiple of the number of poles of the dynamo-electric machine M and the number of slots. The core 1 is held to the housing case 4 by making the projecting sections 13 abut against the external side face of the core 1 or the internal side face of the housing case 4. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a rotating electrical machine, and more particularly to a rotating electrical machine having high vibration and soundproofing properties.

In general, in a motor, pulsation of cogging torque occurs due to a change in magnetic flux caused by the position of a rotor.
This pulsation of the cogging torque causes noise and vibration of the motor, and it has been necessary to reduce it.
As a method for reducing the pulsation of the cogging torque, it is conceivable to optimize the magnetic circuit shape.

However, even if the magnetic circuit shape is optimized, if shrink fitting or press fitting is performed when housing the stator core, there is a possibility that stress is generated in the magnetic circuit portion and the magnetic flux density distribution becomes non-uniform. There is.
In addition, there has been a problem that when the shrink fitting or press fitting is performed, the inner diameter of the teeth is deformed to cause cogging torque pulsation.
Various techniques for solving such problems and reducing cogging torque pulsation have been proposed (see, for example, Patent Document 1 and Patent Document 2).

JP 2002-238231 A JP 2005-269803 A

Patent Document 1 discloses a configuration of a stator core that can reduce cogging torque of a brushless motor.
A plurality of notches are formed on the outer surface of the yoke, which is the outer periphery of the stator core according to Patent Document 1.
The stator core is formed by laminating a plurality of thin electromagnetic steel plates, and a plurality of notches are provided in the vicinity of the outer peripheral side of the teeth.
The plurality of thin electromagnetic steel sheets are stacked such that the formed notch portions are stacked so that the lengths in the stacking direction are substantially equal for each stacked tooth, and are displaced by a predetermined angle in the circumferential direction. .

Patent Document 2 discloses a permanent magnet motor that realizes a stable low cogging torque by preventing slippage between a stator core and a frame.
A plurality of first axial grooves having a substantially rectangular cross section in the axial direction are formed at equal intervals on the outer peripheral surface of the stator core.
A plurality of second axial grooves having a substantially rectangular cross section in the axial direction are also formed at equal intervals on the frame in which the stator core is inserted.
The same number of the first axial grooves and the second axial grooves are formed, and are formed at positions that are aligned when the stator core is inserted into the frame.
In addition, when the stator core is inserted into the frame, a square bar spacer is inserted into the gap having a substantially rectangular cross section formed by the first axial groove and the second axial groove by an interference fit. Thus, the stator core is fixed to the frame with a certain gap.

Since it is configured as described above, the technique described in Patent Document 1 can reduce the size difference of the magnetic path cross-sectional area caused by the notch, thereby reducing the cogging torque pulsation.
Also, with the technique described in Patent Document 2, it is possible to prevent slippage between the stator core and the frame, and to realize a stable low cogging torque motor.

However, in the technique described in Patent Document 1, the notch portions are arranged at every predetermined tooth interval, but the non-uniform period of the magnetic flux density of the teeth overlaps with the non-uniform period of the magnetic flux density due to the tooth shape. There is a problem that the phenomenon that the cogging torque pulsation increases cannot be avoided.
In the technique described in Patent Document 2, the pressing force at the time of shrink-fitting can be made uniform, and the distortion of the magnetic circuit is reduced. However, the period of the fundamental frequency component of the cogging torque pulsation coincides with the cogging torque. The phenomenon of increased pulsation could not be avoided.

  An object of the present invention is to solve the above-mentioned problems, and by changing the configuration of a protrusion that is an abutting portion formed on the inner surface of the housing case or the outer surface of the core, the cogging torque due to shrink fitting stress is achieved. An object of the present invention is to provide a rotating electrical machine capable of reducing pulsation and suppressing vibration and noise.

  According to the rotating electrical machine according to the present invention, the above-described problem supports a substantially cylindrical support portion, a core including a plurality of teeth portions projecting radially inward from the support portion, and an outer peripheral side of the core. And at least one of the outer surface of the core and the inner surface of the housing case protrudes in the housing case direction or the core direction, and in the axial direction. Extending projections are formed between both bottom surfaces, the number of poles of the rotating electrical machine and the number of the least common multiple of the number of slots is not a divisor and multiple, the projection is a free end surface of the projection, The problem is solved by the core being held by the housing case by contacting the outer surface of the core or the inner surface of the housing case.

Thus, in the present invention, a protrusion is formed on the outer surface of the core or the inner surface of the housing case, and the core is supported inside the housing case via the protrusion.
At this time, the number of protrusions formed is a number that is not a divisor or multiple of the least common multiple of the number of poles of the rotating electrical machine and the number of slots.
Since it is configured in this manner, the period of cogging torque pulsation caused by magnetic flux density non-uniformity caused by magnetic characteristic deterioration due to stress during shrink fitting and the period of cogging torque pulsation caused by the core shape match. It can be avoided.
That is, the cogging torque pulsation can be kept low by shifting the period between the two.

Further, in the rotating electrical machine according to claim 1, when the number of slots is zero, the number of the protrusions is not a divisor or a multiple of the number of poles of the rotating electrical machine.
This is applied to the case of a slotless motor, and the cogging torque pulsation can be reduced as described above.

At this time, it is preferable that the protrusion is formed at a position relatively shifted from a position where the slot is formed.
With such a configuration, the cogging torque pulsation caused by the deterioration of the roundness of the tip of the teeth can be effectively suppressed by not matching the formation position of the protrusion and the slot position.

Furthermore, at this time, it is preferable that the protrusion is formed in an inclined state with respect to the axial direction.
Since it is configured in this way, the period of cogging torque pulsation caused by stress during shrink fitting can be shifted to reduce cogging torque pulsation.
In addition, since the cycle of cogging torque pulsation caused by deterioration of the roundness of the tip of the tooth due to stress on the back surface of the core can be shifted, cogging torque pulsation can be reduced.

At this time, when the inclination angle of the protrusion with respect to the axial direction is θ, the number of protrusions formed is n, and the length of the core in the axial direction is L1, the outer peripheral length L of the core is
(Equation 1)
L = n × L1 × tan θ
It is preferable that it is comprised so that it may be represented by these.
Since it is configured in this manner, the cogging torque pulsation periods caused by stress during shrink fitting can be shifted to cancel each other.

  Further, it is more preferable that the protrusion is disposed at a location where the core is welded to the housing case because the period of cogging torque pulsation caused by stress during shrink fitting can be shifted.

  Further, according to the rotating electrical machine according to the present invention, the above-described problem is achieved by providing a substantially cylindrical support portion, a core including a plurality of teeth portions protruding radially inward from the support portion, and an outer peripheral side of the core. And a housing case that supports and covers the shock absorber, wherein the space formed between the core and the housing case is disposed between the bottom surfaces so as to extend in the axial direction. The number of poles of the rotating electrical machine and the number that is not a divisor or multiple of the least common multiple of the number of slots are arranged, and the core is supported by the housing case via the shock absorber. Is solved.

  Thus, in the present invention, since the core can be supported by the housing case via the shock absorber, the vibration caused by the cogging torque pulsation is attenuated by the shock absorber such as a resin or a damping alloy, and low vibration and A low-noise rotating electric machine can be provided.

According to the present invention, a predetermined number of protrusions are formed at predetermined positions on the inner surface of the housing case or the outer surface of the core, and the core is supported on the housing case via the protrusions, thereby cogging torque pulsation due to shrinkage stress. Can be reduced.
For this reason, while fixing a core to a housing case reliably and suppressing a vibration, the noise accompanying this vibration can be reduced efficiently.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
Note that the configuration described below does not limit the present invention and can be variously modified within the scope of the gist of the present invention.
This embodiment is a brushless motor that can reduce cogging torque pulsation due to baking fitting stress and suppress vibration and noise by changing the configuration of the protrusion that is a contact portion formed on the inner surface of the housing case. It is about.

1 to 3 show a first embodiment of the present invention. FIG. 1 is an explanatory view showing a motor, FIG. 2 is a perspective view of a stator core, and FIG. 3 is a cross-sectional equivalent view showing a mounting state of the stator core. is there.
FIG. 4 is a perspective view of a stator core according to the second embodiment of the present invention, and FIG. 5 is a perspective view of the stator core according to the third embodiment of the present invention.
6 and 7 show a fourth embodiment of the present invention. FIG. 6 is a perspective view of the housing case, and FIG. 7 is a top view of the housing case in which the stator core is disposed.
FIG. 8 is a top view showing a state in which the stator core is disposed in the housing case according to the fifth embodiment of the present invention.

(First embodiment)
First, the configuration of a brushless motor M (hereinafter simply referred to as “motor M”) as a rotating electrical machine according to the present embodiment will be described with reference to FIG.
In addition, although the coil | winding is wound around the teeth 11, in FIG. 1, description of the coil | winding is abbreviate | omitted for description.
The motor M according to the present embodiment includes a stator core 1 as a core, a rotor 2, and a housing case 4.
The stator core 1 according to the present embodiment includes twelve teeth 11, an outer peripheral ring portion 12 as a support portion that supports the teeth 11, and a contact portion 13 as a protrusion.

The outer ring portion 12 is a cylindrical body having a ring-shaped cross section.
The teeth 11 are formed in a substantially T-shaped horizontal cross section, and protrude from the outer ring part 12 toward the center.
The free ends of the teeth 11 are formed in a substantially arcuate curved surface, and the free ends of the 12 teeth 11 are arranged on a substantially circumference.
A winding (not shown) is wound around the tooth 11, and the rotational driving force of the rotor 2 is obtained by switching the energization direction of the winding.

The contact portion 13 is configured as a protruding edge that protrudes outward from the outer surface of the outer ring portion 12.
In the present embodiment, the abutment portion 13 is a protrusion having a substantially rectangular cross section, and is formed between both bottom surfaces of the outer peripheral ring portion 12 and substantially parallel to the axial direction.
Further, the abutment portions 13 are formed in numbers that are not divisors or multiples of the least common multiple of the number of poles and the number of slots of the motor M.

Thereby, it is avoided that the period of cogging torque pulsation caused by magnetic flux density non-uniformity caused by magnetic characteristic deterioration due to stress at the time of shrink fitting and the basic period of cogging torque pulsation caused by the shape of stator core 1 are matched. Cogging torque pulsation can be reduced.
The stator core 1 according to the present embodiment includes an annular portion that constitutes the outer peripheral annular portion 12, a plurality of substantially T-shaped portions that constitute the teeth 11, and a substantially rectangular protruding portion that constitutes the contact portion 13. Are laminated in the axial direction.

The rotor 2 according to this embodiment includes a magnet 21 and a rotating shaft 22.
The magnets 21 are permanent magnets, and are arranged along the circumference of the rotor 2 horizontal cross section so that the north and south poles are alternated.
The rotating shaft 22 is a shaft that serves as the rotation center of the rotor 2, passes through the center of the rotor 2, and both ends are rotatably supported by bearings (not shown).

The housing case 4 according to the present embodiment is a case for holding the stator core 1, is disposed so as to surround the outer peripheral portion of the stator core 1, and supports the stator core 1.
As described above, in the motor M according to the present embodiment, the rotor 2 rotates the inner peripheral portion of the stator core 1 fixed to the housing case 4, thereby generating a rotation output on the rotating shaft 22.

A detailed configuration of the stator core 1 according to the present embodiment will be described with reference to FIGS. 2 and 3.
FIG. 2 is a perspective view of the stator core 1 according to the present embodiment, and FIG. 3 is a cross-sectional equivalent view of the stator core 1 according to the present embodiment assembled in a housing case 4.
As shown in FIG. 2, the stator core 1 according to the present embodiment is formed with a plurality of abutting portions 13 that abut against the housing case 4 and support the stator core 1 on the housing case 4.

The abutment portion 13 is formed between both bottom surfaces of the stator core 1, and the formation direction thereof is substantially parallel to the axial direction.
Further, the intervals between the adjacent contact portions 13, 13 are all formed at equal intervals.
Further, as described above, the contact portions 13 are formed in a number that is not a divisor or a multiple of the least common multiple of the number of poles and the number of slots of the motor M.
When applied to a slotless motor (since the number of slots is zero), the number is not a divisor or multiple of the number of poles.

As shown in FIG. 3, the stator core 1 is held in the housing case 4 by shrink fitting.
3, illustration of the rotor 2 (including the rotating shaft 22) disposed in the inner hole of the stator core 1 is omitted for the sake of explanation.
Since it is formed in this way, the period of cogging torque pulsation caused by magnetic flux density non-uniformity caused by magnetic characteristic deterioration due to stress during shrink fitting and the basic period of cogging torque pulsation caused by the shape of the stator core 1 coincide with each other. Can be avoided, and cogging torque pulsation can be reduced.

(Second Embodiment)
Next, a second embodiment will be described with reference to FIG.
In the present embodiment, the configuration of the stator core 101 is changed, and the other configurations are the same as those in the first embodiment.
Therefore, the same components as those in the first embodiment are denoted by the same reference numerals and description thereof is omitted.
The stator core 101 according to the present embodiment includes twelve teeth 111, an outer peripheral ring portion 112 as a support portion that supports the teeth 111, and a contact portion 113.

The outer ring part 112 is a cylindrical body having a ring-shaped cross section.
The teeth 111 are formed in a substantially T-shaped horizontal cross section, and project from the outer ring part 112 toward the center.
The free ends of the teeth 111 are formed in a substantially arcuate curved surface, and the free ends of the twelve teeth 111 are arranged on a substantially circumference.
A winding (not shown) is wound around the tooth 111, and the rotational driving force of the rotor 2 is obtained by switching the energization direction of the winding.

The contact portion 113 is configured as a protruding edge that protrudes outward from the outer surface of the outer ring portion 112.
In the present embodiment, the contact portion 113 is a protrusion having a substantially rectangular cross section, and is formed between both bottom surfaces of the outer ring portion 112.
In addition, the contact portion 113 is inclined at an angle θ with respect to the axial direction and is formed in a skew shape.
Further, the contact portions 113 are formed in numbers that are not divisors or multiples of the least common multiple of the number of poles and the number of slots of the motor M.
When applied to a slotless motor (since the number of slots is zero), the number is not a divisor or multiple of the number of poles.
Further, when the inclination angle of the contact portion 113 with respect to the axial direction is θ, the number of contact portions 113 formed is n, and the axial length of the stator core 101 is L1, the contact portion with the outer peripheral length L of the stator core 101 The relationship with the number of formations 113 is configured to be expressed by the following equation.

(Equation 1)
L = n × L1 × tan θ

As a result, the cogging torque pulsation period caused by magnetic flux density non-uniformity caused by magnetic characteristic deterioration due to stress during shrink fitting and the basic period of cogging torque pulsation caused by the shape of the stator core 101 can be avoided. Cogging torque pulsation can be reduced.
Further, the cogging torque pulsation can be reduced by shifting the period of the cogging torque pulsation generated when the roundness of the tip of the tooth 111 is deteriorated due to the back stress of the stator core 101.
However, the contact portion 113 may not be continuous, and may be changed stepwise.

(Third embodiment)
Next, a third embodiment will be described with reference to FIG.
In the present embodiment, the configuration of the stator core 201 is changed, and the other configurations are the same as those in the first embodiment.
Therefore, the same components as those in the first embodiment are denoted by the same reference numerals and description thereof is omitted.
The stator core 201 according to the present embodiment includes twelve teeth 211, an outer peripheral ring portion 212 as a support portion that supports the teeth 211, and a contact portion 213.

The outer ring part 212 is a cylindrical body having a ring-shaped cross section.
The teeth 211 are formed in a substantially T-shaped horizontal cross section, and protrude from the outer ring part 212 toward the center.
The free ends of the teeth 211 are formed in a substantially arcuate curved surface, and the free ends of the twelve teeth 211 are arranged on a substantially circumference.
A winding (not shown) is wound around the tooth 211, and the rotational driving force of the rotor 2 is obtained by switching the energization direction of the winding.

The contact portion 213 is configured as a protruding edge that protrudes outward from the outer surface of the outer ring portion 212.
In the present embodiment, the contact portion 213 is a protrusion having a substantially rectangular cross section, and is formed between both bottom surfaces of the outer ring portion 212.
The contact portion 213 is formed substantially parallel to the axial direction.
Furthermore, the number of the contact portions 213 is not a divisor or a multiple of the least common multiple of the number of poles and the number of slots of the motor M.
When applied to a slotless motor (since the number of slots is zero), the number is not a divisor or multiple of the number of poles.

Further, the stator core 201 according to the present embodiment includes an annular portion that constitutes the outer peripheral annular portion 212, a plurality of substantially T-shaped portions that constitute the teeth 211, and a substantially rectangular protruding portion that constitutes the contact portion 213. Are laminated in the axial direction.
At this time, the layers are stacked with the teeth 211 slightly shifted.
In other words, the axial grooves formed between the teeth 211 and 211 are stacked so as to form a skewed groove inclined at an angle θ in the axial direction (hereinafter referred to as “skew 214”).
At this time (when the stator core 201 is formed by laminating thin plates), the contact portion 213 formed on the outer surface of the stator core 201 is formed to be parallel to the axial direction.
With this configuration, the inner wall surface of the stator core 201 (that is, the surface facing the rotor 2) has a plurality of skews 214 (skew grooves 214) that are skew-shaped grooves inclined at an angle θ with respect to the axial direction. Will be formed).

Further, as in the first embodiment, the number of contact portions 213 is not a divisor or a multiple of the least common multiple of the number of poles and the number of slots of the motor M.
When applied to a slotless motor (since the number of slots is zero), the number is not a divisor or a multiple of the number of poles.
The tip of the teeth 211 is configured in this manner, and the formation direction of the contact portion 213 and the formation direction of the skew 214 do not coincide with each other (the skew 214 is formed at an angle θ with respect to the axial direction). By shifting the period of cogging torque pulsation caused by the deterioration of the roundness of the cogging torque, the cogging torque pulsation can be effectively reduced.

(Fourth embodiment)
Next, a fourth embodiment will be described with reference to FIGS.
In the present embodiment, the configuration of the housing case 104 is changed, and other configurations are the same as those in the first embodiment.
Therefore, the same components as those in the first embodiment are denoted by the same reference numerals and description thereof is omitted.
6 is a perspective view of the housing case 104 according to the present embodiment, and FIG. 7 is a top view of the housing case 104 according to the present embodiment.

As shown in FIG. 6, a plurality of contact portions 313 are formed on the inner wall surface of the housing case 104 according to this embodiment.
The contact portion 313 according to the present embodiment is a protruding edge having a substantially rectangular cross section that protrudes inward (center direction) from the inner wall surface of the housing case 104.
A plurality of the abutting portions 313 are formed on the inner wall surface of the housing case 104 over both bottom surfaces along the axial direction.
The number of the contact portions 313 formed is a divisor and a number that is not a multiple of the least common multiple of the number of poles and the number of slots of the motor M.
When applied to a slotless motor (since the number of slots is zero), the number is not a divisor or a multiple of the number of poles.

A state in which the stator core 301 is attached to the housing case 104 will be described with reference to FIG.
The stator core 301 according to the present embodiment has the same configuration as that of the stator core 1 according to the first embodiment, except that the contact portion 13 is not formed.
That is, the stator core 301 is configured by the outer peripheral ring portion 12 that is a cylindrical body having a ring-shaped cross section and the teeth 11 having a substantially T-shaped horizontal cross section that protrudes from the outer peripheral ring portion 12 toward the center direction. Twelve teeth 11 are formed.
Moreover, the free end part of the teeth 11 is formed in the substantially circular arc-shaped curved surface, and the free ends of 12 teeth 11 are arrange | positioned at a substantially circumferential shape.
A winding (not shown) is wound around the tooth 11, and the rotational driving force of the rotor 2 is obtained by switching the energization direction of the winding.

The stator core 301 is press-fitted into the housing case 104 so that the outer surface thereof is in pressure contact with the contact portion 313.
Moreover, in this embodiment, this contact part 313 and the outer peripheral surface of the teeth 11 are being fixed by welding.
With this configuration, the period of cogging torque pulsation due to magnetic flux density non-uniformity caused by magnetic characteristic degradation due to stress during shrink fitting and the basic period of cogging torque pulsation due to the shape of the stator core 301 are obtained. Matching can be avoided, and cogging torque pulsation can be reduced.

(Fifth embodiment)
Next, a fifth embodiment will be described with reference to FIG.
In the present embodiment, the configuration of the housing case 204 is the same as that of the fourth embodiment, except that the contact portion 313 is not formed.
The configuration of the stator core 301 is the same as that of the fourth embodiment.

As shown in FIG. 8, in the present embodiment, the gap formed between the inner wall surface of the housing case 204 and the outer peripheral surface of the stator core 301 is filled with a plurality of vibration isolating materials 413.
That is, the anti-vibration material 413 is press-fitted and fixed at the position where the contact portion 313 is formed in the fourth embodiment, whereby the stator core 301 is supported by the housing case 204.
As the vibration-proof material 413, for example, a resin material having elasticity such as rubber, a metal member such as a vibration-proof alloy (for example, an aluminum alloy), or the like is used.
With this configuration, the period of cogging torque pulsation due to magnetic flux density non-uniformity caused by magnetic characteristic degradation due to stress during shrink fitting and the basic period of cogging torque pulsation due to the shape of the stator core 301 are obtained. Matching can be avoided, and cogging torque pulsation can be reduced.

It is explanatory drawing which shows the motor which concerns on 1st Embodiment of this invention. It is a perspective view of the stator core which concerns on 1st Embodiment of this invention. It is a cross-sectional equivalent view which shows the attachment state of the stator core which concerns on 1st Embodiment of this invention. It is a perspective view of the stator core which concerns on 2nd Embodiment of this invention. It is a perspective view of the stator core which concerns on 3rd Embodiment of this invention. It is a perspective view of the housing case which concerns on 4th Embodiment of this invention. It is a top view in the state where the stator core was arranged in the housing case concerning a 4th embodiment of the present invention. It is a top view in the state where the stator core was arranged in the housing case concerning a 5th embodiment of the present invention.

Explanation of symbols

1, 101, 201, 301 ... stator core, 11, 111, 211 ... teeth,
12, 112, 212 ... outer ring, 214 ... skew,
13, 113, 213, 313 ... contact part,
2 ... rotor, 21 ... magnet, 22 ... rotating shaft,
4, 104, 204. Housing case,
413 ... vibration-proof material,
M Motor

Claims (7)

A substantially cylindrical support portion, and a core including a plurality of teeth portions projecting radially inward from the support portion;
A rotating electrical machine comprising a housing case that supports and covers the outer peripheral side of the core,
At least one of the outer surface of the core and the inner surface of the housing case has a protrusion that protrudes in the housing case direction or the core direction and extends in the axial direction. A number that is not a divisor or multiple of the least common multiple of the number of poles and the number of slots is formed.
The rotating electrical machine according to claim 1, wherein the protrusion is configured such that the core is held by the housing case when a free end surface of the protrusion comes into contact with the outer surface of the core or the inner surface of the housing case.   2. The rotating electrical machine according to claim 1, wherein when the number of slots is zero, the number of the protrusions is not a divisor or a multiple of the number of poles of the rotating electrical machine.   The rotating electrical machine according to claim 1, wherein the protrusion is formed at a position relatively shifted from a position where the slot is formed.   The rotating electric machine according to any one of claims 1 to 3, wherein the protrusion is formed in a state of being inclined with respect to the axial direction. When the inclination angle of the protrusion with respect to the axial direction is θ, the number of protrusions formed is n, and the length of the core in the axial direction is L1, the outer peripheral length L of the core is:
(Equation 1)
L = n × L1 × tan θ
The rotating electrical machine according to claim 4, wherein   The rotating electrical machine according to any one of claims 1 to 5, wherein the protrusion is disposed at a location where the core is welded to the housing case. A substantially cylindrical support portion, and a core including a plurality of teeth portions projecting radially inward from the support portion;
A rotating electrical machine comprising a housing case that supports and covers the outer peripheral side of the core,
In the gap formed between the core and the housing case, an impact absorber disposed so as to extend in the axial direction between both bottom surfaces is approximately the least common multiple of the number of poles and the number of slots of the rotating electrical machine. Numbers and numbers that are not multiples are arranged,
The rotating electrical machine according to claim 1, wherein the core is supported by the housing case via the shock absorber.

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