JP6364444B2 - Rotating electric machine stator - Google Patents

Description

  The present invention relates to a stator for a rotating electrical machine.

In recent years, rotating electrical machines have been used as electric motors that are mounted on vehicles and generate driving force, or generators that generate electricity during deceleration.
Such a stator of a rotating electrical machine includes a stator coil for generating a rotating magnetic field and a stator core around which the stator coil is wound.
Further, when the stator core is composed of a plurality of stator pieces divided in the circumferential direction, the stator further includes a cylindrical stator holder that holds the plurality of stator pieces.

By the way, when the rotor rotates, an electromagnetic excitation force (a radial attracting force and a repulsive force due to magnetism) acts on the stator (stator piece) from the rotor.
Further, since the electromagnetic excitation force is generated by the order of the magnetic poles of the rotor, the electromagnetic excitation force acts on the plurality of stator pieces, and the stator holder vibrates circularly.
From the above, the vibration of the stator holder is transmitted to the housing or the like, and noise may be generated from the rotating electrical machine.

In order to suppress such noise, in the prior art, a plurality of ribs are formed on the outer peripheral surface of the stator holder to increase the rigidity of the stator holder and reduce the vibration of the stator holder.
For example, in the stator holder of Patent Document 1, a plurality of ribs extending in the axial direction are formed in the circumferential direction. Moreover, in the stator holder of Patent Document 2, a plurality of ribs extending in the circumferential direction are formed in the axial direction.

Japanese Unexamined Patent Publication No. 2000-60059 JP 2014-166031 A

However, according to Patent Document 1, although vibration in the axial direction can be reduced, vibration in the circumferential direction cannot be reduced. On the other hand, according to Patent Document 2, although the vibration in the axial direction can be reduced, there is room for further improvement regarding reduction of the vibration in the circumferential direction.
Also, if both the axially extending ribs and the circumferentially extending ribs are formed on the stator holder in order to reduce both the axial and circumferential vibrations, an increase in weight and layout restrictions are caused, which is not preferable. .
Therefore, it is desired to develop a stator holder (stator) that can reduce both axial vibration and circumferential vibration while avoiding an increase in weight and layout restrictions.

  Therefore, the present invention was devised in view of the above-described background, and is a rotating electrical machine that can reduce both axial vibration and circumferential vibration while avoiding an increase in weight and a restriction on layout. It is an object to provide a stator.

As means for solving the above-mentioned problems, a stator holder according to the present invention comprises a plurality of stator pieces arranged in a circumferential direction, and a cylindrical stator holder that holds the plurality of stator pieces, and the stator holder the outer peripheral surface of a plurality of ribs are provided, wherein each rib, Ri tilted ribs der extending with axially inclined, at least part of the inclined ribs of the plurality of inclined ribs circumferentially The interval between the inclined ribs having different shapes and the inclined ribs adjacent in the circumferential direction is different from the interval between the other inclined ribs .

According to the invention, the inclined rib increases the rigidity between the axial direction and the circumferential direction of the stator holder. Thus, axial vibration and circumferential vibration due to the stator holder are reduced.
Further, according to the invention, since both the axially extending rib and the circumferentially extending rib described in the prior art are not formed, the disadvantages of weight increase and layout limitation can be avoided.

Here, the electromagnetic excitation force acting on the stator is displaced in the circumferential direction as the rotor rotates.
For this reason, when a gap extending in the axial direction is formed between the inclined ribs adjacent in the circumferential direction, the rigidity between the inclined ribs is low, and vibration cannot be reduced.

  Therefore, in order to solve the problem, in the invention, it is preferable that a part of the inclined rib overlaps with another inclined rib adjacent in the circumferential direction when viewed from the axial direction.

  According to the said structure, since the clearance gap extended in an axial direction is no longer formed between the inclination ribs adjacent to the circumferential direction, the above subjects can be solved.

  Moreover, in the said invention, it is preferable that the said inclination rib is extended from the one end to the other end in the outer peripheral surface of the said stator holder.

  According to the said structure, the site | part which rigidity improves in a stator holder increases, and a vibration can be reduced more.

  Moreover, in the said invention, it is preferable that the opening part of the said stator holder is provided with the flange part which protrudes to a radial direction outer side, and the edge part of the said inclination rib is joined to the said flange part.

  According to the said structure, the rigidity of the opening part vicinity of a stator holder improves, and it can reduce a vibration more.

Further, in the invention, the number of said plurality of inclined ribs is preferably an integer multiple of the number of magnetic poles B over data.

  Generally, an electromagnetic excitation force corresponding to the order of the magnetic poles of the rotor (an integral multiple of the number of magnetic poles) acts on the stator. Therefore, according to the said structure, the vibration by electromagnetic exciting force can be reduced effectively.

  ADVANTAGE OF THE INVENTION According to this invention, the stator holder which can reduce both the vibration of an axial direction and the vibration of a circumferential direction can be provided, avoiding the increase in a weight and the restriction | limiting of a layout.

It is the front view which looked at the electric motor to which the stator of the embodiment is applied from the front side (axial direction one side). It is the perspective view which looked at the stator piece from the outer peripheral side and upper direction. It is a disassembled perspective view of a stator piece. It is the perspective view which looked at the stator holder from the back side (axial direction other side). It is the expanded view which cut and expanded the stator holder to the axial direction, and was seen from the outer peripheral side. It is a figure for demonstrating the inclination part of a modification.

  Next, an electric motor to which the stator of the embodiment is applied will be described with reference to the drawings. The stator of the present invention is not limited to an electric motor, and may be applied to a generator.

(Electric motor)
The electric motor 100 is for converting electric energy into a rotational motion of the rotary shaft 101.
As shown in FIG. 1, the electric motor 100 includes a rotating shaft 101 that is rotatable around an axis O, a cylindrical rotor 102 that passes through the rotating shaft 101, and a cylindrical stator 1 that surrounds the outer periphery of the rotor 102. And a housing (not shown) for housing them.
For convenience of explanation, the direction in which the axis O extends is the front-rear direction.

(Rotor)
The rotor 102 is a component that is rotated by a rotating magnetic field generated by the stator 1.
Although not particularly illustrated, the rotor 102 includes a rotor core and a plurality of permanent magnets embedded in the rotor core.

The rotor core is a cylindrical part formed by stacking a plurality of annular electromagnetic steel plates, and a through hole is formed at the center. In addition, the rotary shaft 101 is press-fitted into the through hole, and the rotor core and the rotary shaft 101 are integrated.
Further, the rotor 102 of the present embodiment has an 8-pole number (4-pole pair number). For this reason, when the rotor 102 rotates (when the rotating magnetic field of the stator 1 is generated), there are eight electromagnetic excitation forces (see arrow F in FIG. 1) that act on the stator 1.

(Stator)
The stator 1 is a component for generating a rotating magnetic field that rotates the rotor 102.
As shown in FIG. 1, the stator 1 is arranged in the circumferential direction around the axis O, and includes 18 stator pieces 2 and 18 stator pieces 2 constituting the U phase, the V phase, and the W phase, respectively. A stator holder 3 for holding.

As shown in FIGS. 2 and 3, the stator piece 2 includes a T-shaped split core 10, an insulator 20 that covers the split core 10, and a coil 30 that is wound around the insulator 20.
In the following description, the radially inner side or the radially outer side may be simply referred to as “inner side” or “outer side”. Further, when the stator 1 is viewed from the front side, the clockwise direction may be referred to as “right side” and the counterclockwise direction may be referred to as “left side”.

As shown in FIG. 3, the split core 10 is a component formed by stacking a plurality of substantially T-shaped electromagnetic steel plates 11 in the thickness direction.
The split core 10 includes a substantially arc-shaped main body portion 12 as viewed from the front-rear direction (axial direction), and a tooth 13 that protrudes inward (radially inward) from the inner peripheral surface of the main body portion 12.

The tooth 13 is a part around which the coil 30 is wound via a winding part 21 described later of the insulator 20.
The teeth 13 have a smaller width in the circumferential direction than the main body portion 12. For this reason, a space (slot) for routing the coil 30 in the axial direction is formed between the teeth 13 of the split cores 10 adjacent in the circumferential direction.

A convex portion 14 is formed on the left side surface 12 a in the circumferential direction of the main body portion 12.
On the right side surface 12b in the circumferential direction of the main body 12, a recess 15 is formed that fits into the projection 14 of the split core 10 arranged on the left side in the circumferential direction. According to the convex portion 14 and the concave portion 15, it is difficult for the split cores 10 arranged in the circumferential direction to be displaced in the radial direction.

The insulator 20 is a component made of an electrically insulating material such as a flexible resin.
The insulator 20 includes a winding portion 21 that covers the teeth 13 and the coil 30 is wound thereon, and a guide portion 22 that protrudes forward from the front surface of the main body portion 12 of the split core 10.

As shown in FIG. 3, the insulator 20 according to the present embodiment includes an insulator body 23 formed with a substantially U-shaped upper winding portion 21 a that opens rearward and a guide portion 22, and a front portion. And a substantially U-shaped lower winding portion 21b that opens.
And the winding part 21 which coat | covers the circumference | surroundings of the teeth 13 is comprised because the upper side winding part 21a and the lower side winding part 21b pinch | interpose the teeth 13 from the front-back direction.

A groove 24 that opens radially outward is formed in the guide portion 22. The groove 24 extends in the circumferential direction, and is a portion for guiding the coil 30 in the circumferential direction in cooperation with the guide portion 22 (groove 24) of the other stator piece 2.
And as shown in FIG. 1, the conducting wire of each coil 30 pulled out from the winding part 21 is wound around the several guide part 22, and is pulled to the position of the bus bar U, V, W, or the neutral terminal N. It has been turned.

(Stator holder)
As shown in FIG. 4, the stator holder 3 is a cylindrical metal part that opens in the axial direction (front-rear direction).
The stator holder 3 holds a state in which a plurality of stator pieces 2 are fitted on the inner peripheral side and are arranged in the circumferential direction of the plurality of stator pieces 2 (see FIG. 1).
The front opening 3a of the stator holder 3 is formed with a flange portion 4 that projects outward in the radial direction.
A plurality of inclined ribs 5 projecting radially outward are formed on the outer peripheral surface 3 b of the stator holder 3.

The flange part 4 is a part for attaching the stator holder 3 to the housing.
A plurality of through holes 4a are formed in the flange portion 4 so as to penetrate the shaft portion of a bolt that is screwed into a housing (not shown). The flange portion 4 is fastened to the head of a bolt that penetrates the through hole 4a, and the stator holder 3 is fixed to the housing.

(Inclined rib)
The inclined rib 5 is a metal bar having a rectangular cross section extending along the outer peripheral surface 3b of the stator holder 3, and is joined to the outer peripheral surface 3b of the stator holder 3 by welding.

As shown in FIG. 5, the inclined rib 5 has a substantially linear shape when viewed from the outer peripheral side.
The inclined rib 5 is inclined by θ ° with respect to the axial direction (front-rear direction) on the outer peripheral surface 3 b of the stator holder 3. That is, one end portion (front end portion 5a) of the inclined rib 5 is located on the left side (counterclockwise direction) with respect to the axial direction, and one end portion (rear end portion 5b) of the inclined rib 5 is on the right side (right side) with respect to the axial direction. In the direction of rotation).
From the above, the stator holder 3 is improved in both axial rigidity (see arrows A1 and A2 in FIG. 5) and circumferential rigidity (see arrows B1 and B2).

  The inclined rib 5 extends from the front end to the rear end of the outer peripheral surface 3 b of the stator holder 3. For this reason, the rigidity is enhanced from the front end to the rear end of the stator holder 3.

  The front end portion 5a of the inclined rib 5 is joined to the rear surface 4b of the flange portion 4 by welding. For this reason, the rigidity of the vicinity of the front opening 3a of the stator holder 3 is further improved.

  The inclined ribs 5 have the same shape and are arranged at equal intervals in the circumferential direction (see L1 in FIG. 5). For this reason, the rigidity of the stator holder 3 is equally improved in the circumferential direction.

Further, the front end portion 5a of each inclined rib 5 overlaps with the rear end portion 5b of the other inclined rib 5 located on the left side in the circumferential direction as viewed from the axial direction (see the range of reference sign S in FIG. 5). . In other words, the inclined rib 5 is formed on the entire circumference of the stator holder 3.
For this reason, even if the electromagnetic excitation force is displaced in the circumferential direction by the rotation of the rotor 102, the vibration of the stator holder 3 can be reduced.

  The number of the inclined ribs 5 is 8, which corresponds to the number of poles (eight poles) of the rotor 102. For this reason, the vibration of the electromagnetic exciting force transmitted to the stator holder 3 can be effectively reduced.

As described above, according to the embodiment, the inclined rib 5 improves the rigidity in the axial direction of the stator holder 3 (see arrows A1 and A2 in FIG. 5) and the rigidity in the circumferential direction (see arrows B1 and B2). Therefore, noise can be reduced by reducing vibration.
Moreover, since it is not necessary to form each of the ribs extending in the axial direction and the ribs extending in the circumferential direction described in the prior art, it is possible to avoid the disadvantages of weight increase and layout limitation.

Although the embodiment has been described above, the present invention is not limited to this.
For example, the number of the inclined ribs 5 is eight corresponding to the number of magnetic poles of the rotor 102, but is not limited thereto, and may be more or less than this.
However, since the electromagnetic excitation force corresponding to the order of the magnetic poles of the rotor 102 acts on the stator 1, the number of the inclined ribs 5 is an integral multiple of the number of magnetic poles of the rotor 102 (in this embodiment, eight). , 16 etc.) is preferable.

Moreover, as shown in FIG. 6, the shape of the inclined rib 5 may be curved (see the inclined ribs 5A and 5B in FIG. 6).
Moreover, each inclination rib 5 is not the same shape, and does not need to be arrange | positioned equally in the circumferential direction (refer inclination rib 5A-5C of FIG. 6).
Further, the inclined rib 5 may not extend from the front end to the rear end of the stator holder 3 or may not be joined to the flange portion 4 (see the inclined rib 5C in FIG. 6).

DESCRIPTION OF SYMBOLS 1 Stator 2 Stator piece 3 Stator holder 4 Flange part 5, 5A, 5B, 5C Inclined rib 10 Divided core 20 Insulator 30 Coil 100 Electric motor 102 Rotor

Claims (5)

A plurality of stator pieces arranged in the circumferential direction;
A cylindrical stator holder for holding the plurality of stator pieces;
With
A plurality of ribs are provided on the outer peripheral surface of the stator holder,
Wherein each rib, Ri tilted ribs der extending with axially inclined,
Among the plurality of inclined ribs, at least some of the inclined ribs are different in shape from inclined ribs adjacent in the circumferential direction,
A stator for a rotating electrical machine, wherein an interval between an inclined rib having a different shape and an inclined rib adjacent in the circumferential direction is different from an interval between other inclined ribs .   2. The stator for a rotating electrical machine according to claim 1, wherein a part of the inclined rib overlaps with another inclined rib adjacent in a circumferential direction when viewed from the axial direction. The inclined ribs stator of the rotating electric machine according to claim 1 or claim 2, characterized in that extending from one end to the other in the outer peripheral surface of the stator holder. The opening of the stator holder is provided with a flange portion projecting radially outward,
The stator of the rotating electrical machine according to any one of claims 1 to 3 , wherein an end portion of the inclined rib is joined to the flange portion. Wherein the plurality of number of inclined ribs, b over motor stator of the rotary electric machine as claimed in any one of claims 4, characterized in that an integer multiple of the number of magnetic poles.

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