JP2000069694A - Assembly teeth-type stator core for electric rotating machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an assembly teeth-type stator core, capable of improving assembly workability significantly without impairing the capability of a combination of other tooth part with a base tooth part. SOLUTION: This stator core of a rotating machine has a stem 25 of other tooth part 2b inserted in a groove 22 at a base tooth part 2a from a rotor side. In this structure, especially, the base tooth part 2a or the other tooth part 2b has a radial slit 23 formed roughly radially. The radial slit 23 expands or shortens in the circumferential directions, when the stem 25 is pushed into the groove 22 and energizes both tooth parts 2a, 2b mutually circumferentially, thus it is possible to prevent the stem 25 from being pulled out of the groove 22 caused by the increase in frictional force.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a teeth type stator core for a rotating electric machine which is made of an electromagnetic laminated steel sheet and has soft magnetism.

[0002]

2. Description of the Related Art Japanese Patent Laying-Open No. 10-145990 discloses a tooth type stator core for a rotary electric machine in which teeth are divided into a cylindrical base tooth portion on a yoke side and another tooth portion fitted with the base tooth portion. Has been proposed. More specifically, the base tooth portion has a pair of side wall portions extending in a substantially radial direction from the yoke while being adjacent to different slots, and a groove portion provided between these both side wall portions and opening to the rotor side. The separate tooth portion includes a peripheral wall portion facing the rotor peripheral surface including an opening narrowing portion protruding substantially in the circumferential direction toward the opening of the slot, and
The stem has a stem protruding from the peripheral wall in a substantially radial direction and closely fitted to the groove, and is formed separately from the base teeth and the yoke. Furthermore, the circumferential cross-sectional shape of these side walls is formed in a so-called inverted trapezoidal shape in which the tip is tapered, and the stem is formed in a tapered trapezoidal shape in order to prevent the separate tooth portion from falling off. Has been proposed.

[0003]

However, in the above-described assembled tooth type stator core for a rotating electric machine described in the above-mentioned publication, although the close fitting property between the base tooth portion and the separate tooth portion is improved, the stem portion is formed in the groove portion. Since the tip of the stem has a greater circumferential width than the opening of the groove when inserting it into the groove, it is necessary to elastically deform the side walls on both sides of the groove to the circumferential groove widening side using a jig, etc. Therefore, it is difficult to employ the stator core of the inner rotor type motor, and even when the stator core of the outer rotor type motor is employed, the assembling work is not easy and the utility is poor.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and does not hinder the connection between the separate tooth portion and the base tooth portion.
It is an object of the present invention to provide an assembling teeth-type stator core for a rotating electric machine that can significantly improve assembling workability.

[0005]

According to the stator core of the rotary electric machine according to the present invention, the groove of the base tooth portion has the following structure.
Insert the stem of another tooth from the rotor side. Particularly in this configuration, the base tooth portion or the separate tooth portion has a radial slit formed in a substantially radial direction. This radial slit opens or shrinks in the circumferential direction when the stem is pushed into the groove, and urges both teeth in the circumferential direction to each other, whereby the stem becomes difficult to fall out of the groove due to an increase in frictional force. .

According to a second aspect of the present invention, in the toothed stator core for assembling the rotating electric machine according to the first aspect, the bottom surface of the groove is formed shallower than the slot, and the radial slit is formed by connecting the stem to the groove. The groove is formed from the bottom surface of the groove to the yoke side with a circumferential gap that is enlarged by insertion. With this configuration, when inserting the stem into the groove, the groove is easily deformed in the circumferential gap expanding direction of the radial slit, so that the circumferential width of the opening of the groove is easily enlarged, and the groove is opened. A stalk having a large circumferential width can be easily pressed into the groove. The stem having a greater circumferential width than the opening of the groove, after being pressed into the groove, urges the radial slit in the circumferential gap enlarging direction. The detachment of the separate tooth portion can be suppressed.

Further, according to this configuration, since the radial slit is provided in the base tooth portion, the magnetic resistance of the cylindrical yoke and the separate tooth portion does not increase due to the radial slit. According to the third aspect of the present invention, in the assembled stator core of the rotating electric machine according to the first aspect, the radial slit is further formed from the top surface of the stem to the side opposite to the yoke, and the radial slit is formed in the circumferential direction. The gap is reduced by inserting the stem into the groove.

In this way, since the groove can be formed deeply, it is possible to increase the total area of the contact boundary portion between the separate tooth portion and the base tooth portion having a small magnetic permeability and reduce the magnetic resistance at the contact boundary portion. it can. Further, since no radial slit is provided in the yoke, the magnetic resistance of the yoke portion does not increase and the mechanical strength does not decrease. The stem has a larger width in the circumferential direction than the opening of the groove, and after being pressed into the groove, urges the radial slit in the circumferential gap reducing direction. The detachment of another tooth portion from the tooth portion can be suppressed.

According to a fourth aspect of the present invention, in the toothed stator core for assembling a rotating electric machine according to the first aspect, the base tooth portion is located between both side walls to have a substantially radial diameter from the yoke into the groove. It has a basal part side stem protruding in the direction,
It has a separate tooth side groove that closely fits with the base tooth side stem, and the radial slit has a circumferential gap that is reduced by insertion of the stem into the groove, and the base tooth side stem or another. A substantially radial direction is formed in the tooth side groove.

With this configuration, the total area of the contact boundary portion between the separate tooth portion and the base tooth portion having low magnetic permeability can be remarkably increased, and the magnetic resistance at the contact boundary portion can be reduced. Since no radial slit is provided, there is no increase in the magnetic resistance of the yoke portion and no decrease in mechanical strength. Furthermore, after the stalk is inserted into the groove, the radial slit is deformed in the circumferential gap reducing direction and the other tooth portion or the base tooth portion is elastically deformed, so that the removal of the other tooth portion from the base tooth portion is suppressed. can do.

According to a fifth aspect of the present invention, in the toothed stator core for assembling the rotating electric machine according to any one of the first to fourth aspects, the non-tip portion in the radial direction of the stem portion of the separate tooth portion further includes a base tooth. It has a circumferential width larger than the opening of the groove of the portion.
This makes it difficult for the separate tooth portion to come off after the separate tooth portion is inserted into the base tooth portion. According to a sixth aspect of the present invention, in the assembled tooth stator core of the rotating electric machine according to the fifth aspect, the radial tip of the stem portion of the separate tooth portion is smaller in the circumferential direction than the opening of the groove portion of the base tooth portion. Have a width. This facilitates the insertion of the stem into the groove.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION Preferred embodiments of an assembled tooth-type stator core of a rotating electric machine according to the present invention will be described with reference to the following embodiments.

[0013]

Embodiment 1 A stator core according to Embodiment 1 will be described below with reference to FIGS. FIG. 1 is a partial front view of the stator core after the teeth assembly is completed, and FIG. 2 is a partial front view of the stator core during the teeth assembly. The stator core includes a ring-shaped yoke 1 forming a so-called yoke, and a large number of teeth 2 and slots 3 alternately arranged in the circumferential direction on the inner peripheral surface of the yoke on the rotor side.

The teeth 2 are a base tooth 2 integral with the yoke 1.
a, a yoke 1 and a base tooth portion 2a, and a separate tooth portion 2b separate from the yoke 1. The yoke 1 and the base tooth portion 2a are formed by laminating thin electromagnetic steel plates. Are laminated. The base tooth portion 2a includes a base portion 20 protruding radially inward from the yoke 1, a pair of side wall portions 21 adjacent to different slots 3 and protruding radially inward from both ends in the circumferential direction of the top of the base portion 20, A groove 22 is provided between the side walls 21 and opens radially inward. The depth of the groove 22 is set to about 1/2 of the depth of the slot 3. Base 20
Is formed with a radial slit 23 formed radially outward from the circumferential center of the bottom surface of the groove 22. The sum of the length of the radial slit 23 and the depth of the groove 22 is set substantially equal to the depth of the slot 3.

The other tooth portion 2b includes an opening narrowing portion 24a projecting substantially in the circumferential direction toward the opening 30 of the slot 3 and is extended in the circumferential direction to thereby form a peripheral wall portion 24 facing the outer peripheral surface of the rotor (not shown). And a stem 25 protruding radially outward from the peripheral wall portion 24 and closely fitted to the groove portion 22. In the state after the completion of the assembly of the teeth shown in FIG. 1, the side surface and the top surface of the stem portion 25 are formed so as to be in close contact with the side surface and the bottom surface of the groove portion 22. Further, the radial slit 23 is configured such that the circumferential gap slightly increases after the stalk 25 is inserted into the groove 22 than before the stalk 25 is inserted into the groove 22. That is, before the stalk 25 is inserted into the groove 22, the circumferential width of the groove 22 is formed to be slightly smaller than the circumferential width of the stalk 25 at the same depth position after the insertion is completed, When the insertion of the stem portion 25 into the groove portion 22 is completed, the base portion 20 and the side wall portion 21 of the base tooth portion 2a
Slightly elastically deforms in the opening direction of the radial slit 23. By doing so, the insertion of the groove 22 into the stem 25 is facilitated, and the inserted stem 25 is pressed in the circumferential direction by the side wall 21 so as to be hard to fall out of the groove 22.

Further, in this embodiment, the circumferential width B of the opening of the groove portion 22 is smaller than the circumferential width C of the deep portion of the groove portion 22, so that the stem portion 25 is harder to fall out of the groove portion 22. ing. However, the circumferential width A of the tip of the stem 25 is set to be smaller than the circumferential width B of the opening of the groove 22, thereby facilitating the initial insertion of the stem 25 into the groove 22. .

(Modification) The separate tooth 2b and the base tooth 2
Needless to say, the joining surface with a may be a curved surface instead of a flat surface. Further, in this embodiment, the circumferential width of the opening of the groove 22 is smaller than the depth of the depth of the groove 22. In addition, the circumferential width of the opening of the groove 22 is smaller than the circumferential width of the depth of the groove 22. It is possible to make it wider.

[0018]

Embodiment 2 Another embodiment of a toothed stator core for assembling a rotating electric machine according to the present invention will be described with reference to FIGS. FIG. 3 is a partial front view of the stator core after the teeth assembly is completed, and FIG. 4 is a partial front view of the stator core during the teeth assembly. This embodiment is characterized in that a radial slit is provided on the stem 25 side and the depth of the groove 22 is substantially equal to the depth of the slot 3 in the structure of the first embodiment.

In the state after the tooth assembly shown in FIG. 3 is completed, the side and top surfaces of the stem 25 are formed so as to be in close contact with the side and bottom surfaces of the groove 22, and the radial slit 23 is formed in the groove 22 of the stem 25. It is formed so that it is slightly open before insertion into the device and is almost or completely closed after the insertion is completed. That is, before the stalk 25 is inserted into the groove 22, the circumferential width of the groove 22 is formed to be slightly smaller than the circumferential width of the stalk 25 at the same depth position after the insertion is completed, When the insertion of the stem 25 into the groove 22 is completed, the radial slit 23 of the stem 25
Are slightly elastically deformed in the reducing direction of the radial slit 23. By doing so, the inserted stem portion 25 is pressed in the circumferential direction by the side wall portion 21 and the groove portion 2 is pressed.
It is difficult to get out of 2.

Further, in this embodiment, the circumferential width B of the opening of the groove portion 22 is smaller than the circumferential width C of the deep portion of the groove portion 22, so that the stem portion 25 is harder to fall out of the groove portion 22. ing. However, the circumferential width A of the tip of the stem 25 is set to be smaller than the circumferential width B of the opening of the groove 22, thereby facilitating the initial insertion of the stem 25 into the groove 22. .

[0021]

Embodiment 3 Another embodiment of a toothed stator core for assembling a rotating electric machine according to the present invention will be described with reference to FIGS. FIG. 5 shows a state in which the base tooth portion 2a and the separate tooth portion 2b are completely fitted. FIG. 6 shows the stem portion 25 of the separate tooth portion 2b in the base tooth portion 2a.
At the beginning of insertion into the groove 22 of FIG.

This embodiment is different from the first embodiment in that
The base tooth portion 2a is provided with a base tooth side stem portion 26, the separate tooth portion 2b is provided with another tooth side groove portion 27 which is tightly fitted with the base tooth portion side stem portion 26, and the radial slit 23 is provided in the base tooth portion side. The feature is that it is provided on the stem 26. The function of the radial slit 23 of this embodiment and the shape for achieving the same are the same as those of the stem 25 of the second embodiment.
Since it is basically the same as the radial slit 23 provided in the above, detailed description is omitted.

By doing so, the base tooth portion 2a and the separate tooth portion 2
Since the junction area with b is increased, the magnetic resistance between the two is reduced, and the same effect as that of the second embodiment can be obtained.

[0024]

Embodiment 4 Another embodiment of a toothed stator core for assembling a rotating electric machine according to the present invention will be described with reference to FIGS. FIG. 7 shows a state in which the base tooth portion 2a and the separate tooth portion 2b are completely fitted, and FIG. 8 shows the stem portion 25 of the separate tooth portion 2b in the base tooth portion 2a.
At the beginning of insertion into the groove 22 of FIG.

This embodiment is different from the third embodiment in that
The feature is that a radial slit 23 is provided in the stem 25. The function of the radial slit 23 in this embodiment and the shape for achieving the same are basically the same as those of the radial slit 23 provided in the groove-side stem 26 of the third embodiment, and a detailed description thereof will be omitted.

By doing so, the base tooth portion 2a and the separate tooth portion 2
Since the junction area with b is increased, the magnetic resistance between the two is reduced, and the same effect as that of the second embodiment can be obtained.

[Brief description of the drawings]

FIG. 1 is a partial front view of a stator core of a rotary electric machine according to a first embodiment after teeth fitting.

FIG. 2 is a partial front view of a stator core of the rotary electric machine according to the first embodiment at the initial stage of teeth fitting.

FIG. 3 is a partial front view of a stator core of a rotary electric machine according to a second embodiment after teeth are fitted.

FIG. 4 is a partial front view of a stator core of a rotary electric machine according to a second embodiment at an initial stage of teeth fitting.

FIG. 5 is a partial front view of a stator core of a rotary electric machine according to a third embodiment after teeth fitting.

FIG. 6 is a partial front view of a stator core of a rotary electric machine according to Embodiment 3 at an initial stage of teeth fitting.

FIG. 7 is a partial front view of a stator core of a rotary electric machine according to a fourth embodiment after teeth fitting.

FIG. 8 is a partial front view of a stator core of a rotary electric machine according to a fourth embodiment at an early stage of teeth fitting.

[Description of References] 1 is a yoke, 2 is a tooth, 2a is a base tooth of the tooth 2, 2b is another tooth of the tooth 2, 3 is a slot, 20 is a base, and 21 is a side wall of the base 2a. , 22 are the base teeth 2a
, 23 is a radial slit, 24a is an aperture narrowing portion of the separate tooth portion 2b, 24 is a peripheral wall portion of the separate tooth portion 2b, 25 is a stem portion of the separate tooth portion 2b, and 26 is a base tooth portion of the base tooth portion 2a. The side stalk 27 is a separate tooth side groove of the separate tooth 2b.

Claims (6)

[Claims] A plurality of slots and teeth arranged circumferentially alternately in a circumferential direction from a cylindrical yoke toward a rotor, wherein the teeth protrude substantially radially from the yoke while being adjacent to the different slots. A pair of side wall portions, a base tooth portion provided between the both side wall portions and having a groove portion that opens to the rotor side, and an opening constriction portion that protrudes in a substantially circumferential direction toward the opening of the slot. A peripheral wall portion facing the rotor peripheral surface, and a stem portion protruding substantially radially from the peripheral wall portion and closely fitted to the groove portion, separately formed from the base tooth portion and the yoke. And a base portion or another tooth portion is formed in a substantially radial direction, and a circumference at the time of the close fitting of the stem portion and the groove portion is provided. Due to deformation of the directional gap Serial assembly tooth type stator core of a rotary electric machine, characterized in that it comprises a radial slit to one another urge the circumferential direction both teeth. 2. The assembled tooth-type stator core for a rotating electric machine according to claim 1, wherein a bottom surface of said groove is formed shallower than said slot, and said radial slit is formed by inserting said stem into said groove. An assembling tooth-type stator core for a rotating electric machine, wherein the stator core is formed from the bottom surface of the groove to the yoke side with an expanding circumferential gap. 3. The assembled tooth-type stator core for a rotating electric machine according to claim 1, wherein the radial slit has a circumferential gap that is reduced by inserting the stem into the groove. An assembling teeth-type stator core for a rotating electric machine, wherein the stator core is formed from a top surface to the opposite side of the yoke. 4. The assembled tooth-type stator core for a rotating electric machine according to claim 1, wherein said base tooth portion is located between said side wall portions and substantially radially projects from said yoke into said groove portion. The base portion has a stem portion, and the stem portion has a separate tooth portion-side groove portion that closely fits with the base portion-side stem portion, and the radial slit is a portion of the stem portion into the groove portion. An assembling tooth-type stator core for a rotating electric machine, wherein the stator core is formed in a substantially radial direction in the base portion side stem portion or the separate tooth portion side groove portion with a circumferential gap reduced by insertion. 5. The assembled tooth-type stator core for a rotary electric machine according to claim 1, wherein the stem portion of the separate tooth portion has a radially non-leading end portion which is closer to an opening of a groove portion of the base tooth portion. An assembling teeth-type stator core for a rotating electric machine, having a large circumferential width. 6. The assembled tooth-type stator core for a rotating electric machine according to claim 5, wherein a radial end portion of the stem portion of the separate tooth portion has a circumferential width smaller than an opening of a groove portion of the base tooth portion. An assembling teeth stator core for a rotating electric machine.