JP2012050178A - Stator core, stator and method of attaching the stator core - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a stator core, a stator and a method of attaching the stator core, capable of increasing flexibility in an attaching direction of a yoke and teeth, improving workability while suppressing increase in iron loss and alleviating restriction of material quality of laminated steel plates.SOLUTION: The stator core 11 includes: the annular yoke 16 comprising the laminated steel plate and having a plurality of trapezoidal yoke side fitting grooves 18 bored from the outer peripheral face in the radial inner side and extended over the overall length in the axial line direction; the plurality of teeth 17 comprising the laminated steel plate and each having a trapezoidal columnar tooth side fitting part 21 fitted to the yoke side fitting groove 18 and a projecting part 22 which is protruded from the yoke 16 to the radial outer side and around which a coil is wound; fitting recesses 24 formed on the tooth side fitting parts 21; and fitting projections 19 formed on the yoke side fitting grooves 18 and fitted to the fitting recesses 24 so as to suppress dropping off of the teeth 17 to the radial outer side with respect to the yoke 16.

Description

  The present invention relates to a stator core provided in a stator (stator) of a rotating electrical machine, a method for assembling the stator, and the stator core.

  Conventionally, as such a stator core, a so-called divided type is known which is provided in a stator which is excellent in assembling workability and has a high coil space factor. For example, a stator core described in Patent Document 1 has a yoke-side fitting portion (70) of a yoke (46) and a teeth-side fitting portion (60) of a tooth (48) configured to be separable from the yoke. It is assembled by combining. At this time, since the projecting portion (74) presses the constricted portion (62) inward by the elastic force, the teeth and the yoke are suitably fitted to prevent the withdrawal. Further, since the first straight portion (68) and the second straight portion (78) are in contact with each other, the teeth and the yoke are suitably positioned. Thereby, rotation with respect to the yoke of teeth is prevented.

  On the other hand, the stator core described in Patent Document 2 has a Y-shape (17) in the radial direction on the teeth side in the fitting portion between the yoke (21) and the teeth (12), and the yoke side has a fan shape. It has a convex shape (24) in the center. Then, by pushing the teeth cut (16) into the convex shape of the yoke, the Y-shape of the teeth is expanded by the convex shape of the yoke, the Y-shape is plastically deformed, and the Y-shaped circumferential outer side The teeth and the yoke are engaged with each other by a compressive force between the end surface (18) of the inner surface and the end surface (25) of the yoke fan in the circumferential direction.

JP 2004-320824 A JP 2008-306854 A

  By the way, in the stator core described in Patent Document 1, when a gap is generated in the fitting portion between the yoke and the tooth, the iron loss increases. Further, with such a complicated shape, it is not easy to precisely manage the gap size, and it is expected that the cost will increase.

  In addition, in the stator core described in patent document 1 as a prior art, what simplified the fitting part shape of a yoke and teeth is described. However, since the yoke and the teeth are fitted by a projecting portion in the radial direction around which the coil is wound, for example, when the teeth are assembled to the yoke, the assembling direction (fitting direction) is It is naturally limited only from the outside in the radial direction that does not interfere with the coil, and the degree of freedom is reduced.

  On the other hand, in the stator core described in Patent Document 2, it is expected that a large distance is required for press-fitting the teeth (Y-shape) into the yoke, and that a large amount of pressure is required for plastic deformation. For this reason, it is expected that the equipment will be enlarged, or depending on the mechanical properties of the laminated steel sheet, cracks and the like will occur, so that the material will be restricted.

  An object of the present invention is to increase the degree of freedom in the assembly direction between the yoke and the teeth, improve workability while suppressing an increase in iron loss, and further reduce the restrictions on the material of the laminated steel sheet. Another object is to provide a method for assembling a stator and a stator core.

  In order to solve the above-mentioned problems, the invention according to claim 1 includes a plurality of trapezoidal yoke-side fitting grooves that are drilled radially inward from the outer peripheral surface and extend over the entire length in the axial direction. An annular yoke made of a steel plate, a trapezoidal columnar teeth-side fitting portion that fits into the yoke-side fitting groove, and a protruding portion that protrudes radially outward from the yoke and is wound with a coil; A plurality of teeth made of laminated steel sheets, a fitting recess formed in one of the yoke-side fitting groove and the teeth-side fitting portion, and any of the yoke-side fitting groove and the teeth-side fitting portion The gist is provided with an insertion convex portion that is formed on the other side and that is fitted into the insertion concave portion and suppresses the teeth from falling off radially outward of the yoke.

  According to the configuration, when the yoke and the plurality of teeth are assembled, the teeth side fitting portion is arranged on the yoke side even when the coil is wound around the protruding portion of the teeth in advance. By fitting into the fitting groove, these yokes and teeth can be easily combined. In this case, since the yoke-side fitting groove and the teeth-side fitting portion are fitted in a trapezoidal shape (including a rectangular shape), a gap between the yoke-side fitting groove and the teeth-side fitting portion is used. The dimensional precision can be easily managed. Therefore, workability can be improved while suppressing an increase in iron loss due to the gap between the yoke-side fitting groove and the teeth-side fitting portion. In addition, since the coil is not wound around the teeth side fitting portion, even if the teeth are assembled to the yoke from either the radial direction or the axial direction, they do not interfere with the coil. Therefore, the degree of freedom in the assembly direction of the yoke and the teeth can be increased. Furthermore, it is possible to prevent the teeth from falling off from the yoke in the radial direction by inserting the fitting convex portion into the fitting concave portion.

  According to a second aspect of the present invention, in the stator core according to the first aspect, the contact surfaces on both sides in the circumferential direction contacting the teeth side fitting portion of the yoke side fitting groove and the teeth side fitting portion of the stator core. The contact surfaces on both sides in the circumferential direction that contact the yoke-side fitting groove are each provided with a gradient so as to be widened outward in the radial direction, and the teeth-side fitting guided in the radial direction by the gradient. The gist is that the fitting convex portion is fitted into the fitting concave portion in a state where the joint portion is press-fitted into the yoke-side fitting groove.

  According to this configuration, in a state where the insertion convex portion is inserted into the insertion concave portion, that is, in a state where the teeth are prevented from falling off radially outward with respect to the yoke, the teeth side fitting portion is fitted to the yoke side fitting. Since it is in a state of being press-fitted into the mating groove, these contact surfaces can be intimately pressed together, and iron loss can be reduced as a result.

  The invention according to claim 3 is the stator core according to claim 1, the winding composed of the plurality of coils respectively wound around the plurality of projecting portions, and the plurality of projecting portions. And a plurality of bobbins interposed between each of the plurality of coils, each of the plurality of bobbins having a pair of flanges extending to both sides in the circumferential direction and contacting the outer peripheral surface of the yoke. However, the gist is that the flanges of the bobbins adjacent to each other in the circumferential direction are overlapped in the radial direction at the cutout portions that are alternately cut out.

  According to the same configuration, the flanges of the bobbins adjacent to each other in the circumferential direction are overlapped in the radial direction at the cutout portions that are alternately cut out, and the outer peripheral surface of the yoke is the plurality of the plurality of flanges. The pair of flanges of the bobbin cover the entire circumference except for the yoke-side fitting groove. Therefore, for example, the rust prevention property of the outer peripheral surface of the yoke can be improved.

  A fourth aspect of the present invention is the stator according to the third aspect, wherein the notches disposed in the pair of flanges of the bobbin are disposed on different sides in the radial direction. And

  According to this configuration, even if all the bobbins are formed in the same shape, the flanges of the adjacent bobbins in the circumferential direction can be overlapped in the radial direction at the cutout portions that are alternately cut out.

  The invention according to claim 5 is an annular yoke made of a laminated steel plate having a plurality of trapezoidal yoke-side fitting grooves that are bored radially inward from the outer peripheral surface and extend over the entire length in the axial direction. A plurality of teeth made of laminated steel sheets, each having a trapezoidal columnar teeth side fitting portion that fits into the yoke side fitting groove, and a projecting portion that protrudes radially outward from the yoke and is wound with a coil; A fitting recess formed in one of the yoke-side fitting groove and the teeth-side fitting portion and a fitting recess formed in one of the yoke-side fitting groove and the teeth-side fitting portion, A stator core provided with a fitting convex portion that is fitted and suppresses the teeth from falling off radially outward of the yoke, wherein the teeth are assembled to the yoke from either the radial direction or the axial direction. Special And summarized in that a method of assembling the stator core to.

  According to the present invention, a stator core and a stator that can increase the degree of freedom in the assembly direction between the yoke and the teeth, improve workability while suppressing an increase in iron loss, and further ease restrictions on the material of the laminated steel sheet. And a method for assembling the stator core can be provided.

The front view which shows one Embodiment of this invention. The cross-sectional view which shows the same embodiment. The front view which shows the same embodiment. (A) (b) is explanatory drawing which shows the assembly | attachment aspect of the embodiment.

DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, an embodiment of the invention will be described with reference to the drawings.
1 and 2 are a front view and a cross-sectional view showing a stator 10 of a rotating electrical machine (for example, a motor) to which the present invention is applied. In each figure, the circumferential direction and radial direction indicated by arrows are centered on the rotating shaft of the rotating electrical machine (center of the stator 10). As shown in the figure, the stator 10 includes a stator core 11, a plurality (24) of bobbins 12, and a winding 13.

  As shown in FIGS. 3 and 4, the stator core 11 is made of a plurality of (24) laminated steel plates that protrude radially at equal angular intervals outwardly in the radial direction of the yoke 16 from an annular yoke 16 made of laminated steel plates. Teeth 17 is combined.

  That is, the yoke 16 has a plurality of trapezoidal yoke-side fitting grooves 18 that are bored radially inward from the outer peripheral surface thereof corresponding to each of the plurality of teeth 17 and extend over the entire length in the axial direction. On the inner wall surfaces 18a on both sides in the circumferential direction of each yoke-side fitting groove 18, a symmetric gradient SL is set so as to be widened outward in the radial direction. In addition, on both inner wall surfaces 18 a of the yoke-side fitting groove 18, rib-like fitting convex portions 19 that extend over the entire length in the axial direction are formed.

  On the other hand, each of the teeth 17 is a trapezoidal columnar tooth-side fitting portion 21 that fits in the yoke-side fitting groove 18, and continues to the teeth-side fitting portion 21 and projects radially outward from the yoke 16. The projecting portion 22 and the distal end portion 23 extending in a flange shape on both sides in the circumferential direction from the distal end of the projecting portion 22 are integrally formed to have a substantially T shape. And the said gradient SL is each set so that it may expand toward the radial direction outer side also on the outer wall surface 21a of the circumferential direction both sides of the teeth side fitting part 21. As shown in FIG. Further, on both outer wall surfaces 21 a of the yoke-side fitting groove 18, groove-like fitting recesses 24 are formed that extend over the entire length in the axial direction.

  Here, for example, when the teeth 17 are assembled to the yoke 16 from the outside in the radial direction, the teeth side fitting portion 21 guided radially inward by the gradient SL is fitted in the yoke side fitting groove 18. The fitting projection 19 is fitted into the recess 24. As a result, the teeth 17 are prevented from falling off in the radial direction with respect to the yoke 16. The yoke-side fitting groove 18 and the teeth-side fitting portion 21 have the same shape when viewed in the axial direction, and therefore the teeth 17 may be assembled to the yoke 16 in the axial direction.

  As shown in FIG. 2, each bobbin 12 is made of, for example, a resin material and is attached to a tooth 17. That is, the bobbin 12 includes a cylindrical portion 26 into which the protruding portion 22 of the tooth 17 is inserted, and a pair of flanges that extend from the radially inner end of the cylindrical portion 26 to both sides in the circumferential direction and abut against the outer peripheral surface of the yoke 16. 27 and 28, and a mounting portion 29 that is expanded from the radially outer end of the cylindrical portion 26 and to which the distal end portion 23 is mounted. And the flanges 27 and 28 have the notch parts 27a and 28a by which the mutually different side was notched in radial direction, respectively. The flanges 27 and 28 of the adjacent bobbins 12 in the circumferential direction are overlapped in the radial direction at the cutout portions 27a and 28a that are alternately cut out. Thereby, the outer peripheral surface of the yoke 16 is covered without a gap over the entire circumference except for the yoke-side fitting groove 18. The bobbin 12 is prevented from coming off in the radial direction with respect to the tooth 17 (tip portion 23) at the mounting portion 29.

  A coil 13a that constitutes the winding 13 is wound around the tooth 17 on which the bobbin 12 is mounted. That is, the winding 13 is a so-called concentrated winding, and includes a plurality of coils 13 a wound around the projecting portions 22 of the plurality of teeth 17 and appropriate crossover wires. Each coil 13a of the winding 13 is prevented from being detached by being sandwiched between the flanges 27 and 28 and the mounting portion 29 in the radial direction.

Next, a method for assembling the stator 10 will be described.
First, the coil 13a is wound around the cylindrical portion 26 by a well-known winding device in a single state on each of the bobbins 12 constituting the stator 10. At this time, the teeth 17 may be attached to the bobbin 12 in advance, or the teeth 17 may be attached to the bobbin 12 after the coil 13a is wound.

  Next, each tooth 17 wound with the coil 13 a is assembled to the yoke 16 from either the radial direction or the axial direction, and the teeth side fitting portion 21 is fitted into the yoke side fitting groove 18. At this time, the teeth 17 are prevented from coming off in the radial direction by the insertion convex portions 19 being inserted into the insertion concave portions 24. Thereby, the coupling of the yoke 16 and all the teeth 17 is completed. In particular, as shown in FIGS. 4A and 4B, when each tooth 17 is assembled to the yoke 16 from the outside in the radial direction, the teeth side fitting portion 21 guided in the radial direction by the gradient SL is fitted to the yoke side. The fitting convex part 19 will be fitted in the fitting recessed part 24 in the state press-fitted with respect to the joint groove 18, and these contact surfaces (inner wall surface 18a and outer wall surface 21a) will press-fit closely.

  In addition, after the coupling of the yoke 16 and all the teeth 17 is completed, the windings 13 are configured by electrically connecting the plurality of coils 13a with the connecting wires, and the assembly of the stator 10 is completed.

As described above in detail, according to the present embodiment, the following effects can be obtained.
(1) In the present embodiment, when the yoke 16 and the plurality of teeth 17 are assembled, even if the coil 13a is wound in advance on the protruding portion 22 of the teeth 17 (the cylindrical portion 26 of the bobbin 12). By fitting the teeth side fitting portion 21 into the yoke side fitting groove 18, the yoke 16 and the teeth 17 can be easily coupled. In this case, since the yoke-side fitting groove 18 and the teeth-side fitting portion 21 are trapezoidal fittings, the precision of the gap dimension between the yoke-side fitting groove 18 and the teeth-side fitting portion 21 is accurate. Can be managed easily. Therefore, an increase in iron loss due to the gap between the yoke-side fitting groove 18 and the teeth-side fitting portion 21 can be suppressed without requiring precision machining. That is, workability can be improved while suppressing an increase in iron loss. Further, an expensive assembly device is not required. In addition, since the coil 13a is not wound around the teeth side fitting portion 21, even if the teeth 17 are assembled to the yoke 16 from either the radial direction or the axial direction, they do not interfere with the coil 13a. Therefore, the freedom degree of the assembly direction of the yoke 16 and the teeth 17 can be increased. Further, the teeth 17 can be prevented from falling off in the radial direction with respect to the yoke 16 by fitting the fitting convex portions 19 into the fitting concave portions 24.

In addition, since there is no stress concentration when the yoke-side fitting groove 18 and the teeth-side fitting portion 21 are fitted, restrictions on the material of the laminated steel plates of the yoke 16 and the teeth 17 can be relaxed.
(2) In the present embodiment, in a state where the insertion convex portion 19 is inserted into the insertion concave portion 24, that is, in a state where the teeth 17 are prevented from falling off radially outward with respect to the yoke 16, the teeth side fitting portion 21 is on the yoke side. It will be in the state press-fitted with respect to the fitting groove 18. For this reason, these contact surfaces (the inner wall surface 18a and the outer wall surface 21a) can be closely bonded to each other, and iron loss can be reduced. Further, the rotation of the teeth 17 relative to the yoke 16 can be prevented.

  (3) In the present embodiment, the flanges 27 and 28 of the adjacent bobbins 12 in the circumferential direction are overlapped in the radial direction at the cutout portions 27a and 28a that are alternately cut away, so that the yoke 16 The outer peripheral surface is covered over the entire circumference excluding the yoke-side fitting groove 18 by a pair of flanges 27 and 28 of the plurality of bobbins 12. Therefore, for example, the rust prevention property of the outer peripheral surface of the yoke 16 can be improved.

  (4) In the present embodiment, the notches 27a and 28a disposed on the pair of flanges 27 and 28 of the bobbin 12 are disposed on different sides in the radial direction, so that all the bobbins 12 are the same. Even if it shape | molds in the shape, the flanges 27 and 28 of each adjacent bobbin 12 in the circumferential direction can be piled up in radial direction in the notch parts 27a and 28a cut out by turns.

In addition, you may change the said embodiment as follows.
In the embodiment, the gradient SL of the yoke-side fitting groove 18 (inner wall surface 18a) and the teeth-side fitting portion 21 (outer wall surface 21a) may be omitted, and each may be rectangular.

  -In the said embodiment, even if the insertion convex part 19 and the insertion recessed part 24 in which this insertion convex part 19 fit are arrange | positioned only in the axial direction of the yoke side fitting groove 18 and the teeth side fitting part 21, Good.

  -In above-mentioned embodiment, the arrangement | positioning relationship of the yoke side fitting groove | channel 18 and the teeth side fitting part 21, and the insertion convex part 19 and the insertion recessed part 24 may be reverse. Further, both the insertion convex portion and the insertion concave portion are arranged in the yoke side fitting groove 18, and the insertion concave portion and the insertion convex portion that are in a fitting relation with the insertion convex portion and the insertion concave portion are arranged in the teeth side fitting portion 21. You may set up. Furthermore, the insertion convex portion and the insertion concave portion do not need to extend over the entire length in the axial direction.

  SL ... gradient, 10 ... stator, 11 ... stator core, 12 ... bobbin, 13 ... winding, 13a ... coil, 16 ... yoke, 17 ... teeth, 18 ... yaw side fitting groove, 18a ... inner wall surface (contact surface) , 19 ... fitting convex part, 21 ... teeth side fitting part, 21a ... outer wall surface (contact surface), 22 ... projecting part, 24 ... fitting concave part, 27, 28 ... flange, 27a, 28a ... notch part.

Claims (5)

An annular yoke made of laminated steel sheets, having a plurality of trapezoidal yoke-side fitting grooves that are drilled radially inward from the outer peripheral surface and extend over the entire length in the axial direction;
A plurality of teeth made of laminated steel sheets, each having a trapezoidal columnar tooth side fitting portion that fits into the yoke side fitting groove, and a projecting portion that protrudes radially outward from the yoke and is wound with a coil. ,
A fitting recess formed in one of the yoke-side fitting groove and the teeth-side fitting portion;
An insertion convex portion that is formed on the other of the yoke side fitting groove and the teeth side fitting portion, and that fits into the fitting concave portion and prevents the teeth from falling off radially outward of the yoke; A stator core characterized by that. The stator core according to claim 1, wherein
The contact surfaces on both sides in the circumferential direction that contact the teeth side fitting portion of the yoke side fitting groove and the contact surfaces on both sides in the circumferential direction that contact the yoke side fitting groove of the teeth side fitting portion are: Each gradient is set to widen radially outward,
The stator core, wherein the insertion convex portion is inserted into the insertion concave portion in a state where the teeth side fitting portion guided in the radial direction by the gradient is press-fitted into the yoke side fitting groove. The stator core according to claim 1 or 2,
A winding composed of a plurality of the coils wound respectively on the plurality of projecting portions;
In the stator comprising the plurality of projecting portions and the plurality of bobbins interposed between the plurality of coils,
The plurality of bobbins each have a pair of flanges that extend on both sides in the circumferential direction and abut against the outer peripheral surface of the yoke
The stator of the stator, wherein the flanges of the adjacent bobbins adjacent to each other in the circumferential direction are overlapped in a radial direction at cutout portions that are alternately cut out. The stator according to claim 3,
The stator is characterized in that the notches disposed in the pair of flanges of the bobbin are disposed on different sides in the radial direction. An annular yoke made of laminated steel sheets, having a plurality of trapezoidal yoke-side fitting grooves that are drilled radially inward from the outer peripheral surface and extend over the entire length in the axial direction;
A plurality of teeth made of laminated steel sheets, each having a trapezoidal columnar tooth side fitting portion that fits into the yoke side fitting groove, and a projecting portion that protrudes radially outward from the yoke and is wound with a coil. ,
A fitting recess formed in one of the yoke-side fitting groove and the teeth-side fitting portion;
A stator core provided with an insertion convex portion formed in one of the yoke-side fitting groove and the teeth-side fitting portion, which is fitted into the fitting concave portion and prevents the teeth from dropping outward in the radial direction with respect to the yoke. Because
A method of assembling a stator core, wherein the teeth are assembled to the yoke from either the radial direction or the axial direction.

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