JP2007259581A - Stator, stator core, and stator core holding member - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a stator that makes the shrink fit unnecessary and that reduces the compressive stress of the shrink fit even if the shrink fit is used. <P>SOLUTION: A recess 11e is provided on the outside circumferential surface 11d outside the motor radial direction A of a yoke portion 11b of each divided core 11, and a plurality of protrusions 5a that are fitted into the recesses 11e are provided on the inside circumferential surface of holding ring 5. The recesses 11e are formed in the motor circumferential direction B in such a way as to be positioned outside the motor radial direction A of teeth portions 11a. The divided cores 11 are made of an easy-to-form powdered-iron magnetic material. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a stator, a stator core, and a stator core holding member.

  In a conventional stator, the stator core is shrunk into a housing or the like (for example, see Patent Document 1).

  A stator core configured to fit and connect an inner core having a plurality of teeth and an outer core is disclosed in Patent Document 2.

Japanese Patent Laid-Open No. 2005-20856 JP 2004-242444 A

  However, when shrink shrinkage is performed, there is a problem that iron loss of the stator core increases due to compressive stress due to shrink shrinkage. In addition, in the case of a stator core formed of a dust magnetic material, it is more fragile than a core made of laminated steel sheets, so that the stator core may be damaged by the compressive stress of shrinkage.

  Therefore, the problem to be solved by the present invention is to provide a stator, a stator core, and a stator core holding member that can eliminate the shrinkage or can reduce the compressive stress of the shrinkage even if the shrinkage is used. is there.

  In order to solve the above-mentioned problem, in the invention of claim 1, the stator core has a stator core disposed on the outer periphery of the rotor, a coil mounted on a tooth portion of the starter core, and a substantially annular cross-sectional shape. A stator core holding member for holding the stator core, and fitted to the outer peripheral surface of the yoke portion of the stator core on the outer side in the motor radial direction and the inner peripheral surface of the stator core holding member facing the outer peripheral surface. An uneven fitting portion is provided.

  According to a second aspect of the invention, in the stator according to the first aspect of the invention, the fitting portion on the stator core side is formed by providing a concave portion on the outer peripheral surface.

  According to a third aspect of the present invention, in the stator according to the first aspect, the stator core and the fitting portion of the stator core holding member that are fitted to each other have a gap between the top and the valley of the unevenness. The tooth surface sides of the concave and convex portions are in contact with each other.

  According to a fourth aspect of the present invention, in the stator according to the third aspect, the fitting portion of the stator core and the stator core holding member is formed by a concavo-convex shape regularly formed in the motor circumferential direction.

  According to a fifth aspect of the present invention, in the stator according to any one of the first to fourth aspects of the present invention, the stator core is formed of a dust magnetic material.

  According to a sixth aspect of the present invention, in the stator according to any one of the first to fifth aspects, the stator holding member has a substantially cylindrical shape, and yokes of the stator core are provided at both ends of the motor axial direction. A holding piece is provided to sandwich and hold the portion from both sides in the motor axial direction.

  In the seventh aspect of the invention, the stator core is disposed on the outer periphery of the rotor, and an uneven fitting portion is provided on the outer peripheral surface of the yoke portion on the outer side in the motor radial direction.

  According to an eighth aspect of the present invention, there is provided a stator core holding member for holding the stator core, and an uneven fitting portion is provided on the inner peripheral surface facing the stator core.

  According to the first aspect of the present invention, the concave and convex fittings that are fitted to each other are arranged on the outer peripheral surface of the yoke portion of the stator core on the outer side in the motor radial direction and the inner peripheral surface of the stator core holding member facing the outer peripheral surface. Since the joint portion is provided, the stator core can be held by reliably stopping the rotation of the stator core by the concave and convex fitting portions that are fitted to each other. For this reason, the shrinkage can be made unnecessary, or even if the shrinkage is used, the compressive stress of the shrinkage can be reduced, thereby increasing the iron loss of the stator core due to the compression stress of the shrinkage, Even when the magnetic powder is used, the stator core can be prevented from being damaged.

  According to invention of Claim 2, the fitting part by the side of a stator core can be formed easily.

  According to invention of Claim 3, in the fitting part of the stator core and the stator core holding member which are in a mutually fitted state, the tooth surface side surfaces of the unevenness with a gap between the top part and the valley part of the unevenness Is in contact with each other, stress is applied only between the substantially uneven tooth surfaces, and the stress applied to the yoke portion through which the magnetic flux passes is distributed, thereby improving the iron loss of the stator core.

  According to the fourth aspect of the present invention, since the fitting portion of the stator core and the stator core holding member is formed by the uneven shape regularly formed in the motor circumferential direction, the fitting portion of such a fitting portion is used. As a result, alignment effect can be obtained and large torque can be reliably maintained.

  According to the fifth aspect of the present invention, since the stator core is formed of a powder magnetic material that can be easily formed, a complicated shape such as an uneven fitting portion of the stator core can be easily realized.

  According to the sixth aspect of the present invention, it is possible to reliably prevent displacement of the stator core in the motor axial direction by the holding pieces provided at both ends of the stator core holding member in the motor axial direction.

  According to the seventh aspect of the present invention, since the concave-convex fitting portion is provided on the outer circumferential surface of the yoke portion of the stator core in the motor radial direction, the fitting portion is fitted to the fitting portion. By providing the concavo-convex structure on the stator core holding member side, the rotation of the stator core can be reliably stopped and the stator core can be held. For this reason, the shrinkage can be eliminated, or even if the shrinkage is used, the compressive stress of the shrinkage can be reduced, thereby increasing the iron loss of the stator core due to the compression stress of the shrinkage, Even when the magnetic powder is used, the stator core can be prevented from being damaged.

  According to the invention described in claim 8, since the concave and convex fitting portion is provided on the inner peripheral surface of the stator core holding member facing the stator core, the concave and convex structure that fits into the fitting portion is provided. By providing it on the starter core side, the rotation of the stator core can be reliably stopped and the stator core can be held. For this reason, the shrinkage can be eliminated, or even if the shrinkage is used, the compressive stress of the shrinkage can be reduced, thereby increasing the iron loss of the stator core due to the compression stress of the shrinkage, Even when the magnetic powder is used, the stator core can be prevented from being damaged.

  FIG. 1 is an exploded perspective view of a stator according to an embodiment of the present invention. As shown in FIG. 1, the stator 1 includes a stator main body 3 and a holding ring 5 corresponding to a stator core holding member of the present invention, and is installed on the outer periphery of the rotor to constitute a motor. The stator body 3 includes a plurality of divided stators 7 arranged in an annular shape. Each divided stator 7 includes a divided core (corresponding to the stator core of the present invention) 11 and a coil 13.

  First, the split core 11 will be described. As shown in FIG. 2, the split core 11 includes a tooth portion 11 a on which the coil 13 is sheathed and a yoke portion 11 b provided on the outer side in the motor radial direction A of the tooth portion 11 a. The yoke portion 11b protrudes from the end of the tooth portion 11a to both sides of the motor circumferential direction B and both sides of the motor axial direction C. Further, at the end portion of the teeth portion 11a on the inner side in the radial direction of the motor, a flange portion 11c that protrudes from the end portion to both sides of the motor circumferential direction B and both sides of the motor axial direction C is provided. Such a split core 11 is composed of a metal magnetic powder or a powder magnetic material obtained by bonding a metal magnetic powder covered with a predetermined insulating film with a resin, and the powder magnetic material is made into a predetermined mold. After filling, pressurizing and compressing, it is formed by heat treatment.

  Further, on the outer peripheral surface 11d on the outer side in the motor radial direction A of the yoke portion 11b of the split core 11, a groove-shaped recess (corresponding to the fitting portion of the present invention) 11e that vertically cuts the yoke portion 11b in the motor axial direction C. Is provided. The concave portion 11e is adapted to be fitted with a convex portion 5a provided on the holding ring 5 described later.

  As shown in FIG. 3, the recess 11 e is formed so as to be positioned on the outer side in the motor radial direction A of the tooth portion 11 a in the motor circumferential direction B. The portion of the yoke portion 11b where the recess 11e is provided is a point where the magnetic flux φ formed along the tooth portion 11a is diverted toward the split cores 11 on both sides in the motor circumferential direction B, and the magnetic flux density becomes rough. For this reason, even if the recess 11e is provided, the flow of the magnetic flux φ is prevented from being obstructed by the recess 11e.

  Further, at both ends of the yoke portion 11b in the motor axial direction C, concave portions 11f and 11g into which holding pieces 5b and 5c provided on a holding ring 5 described later are fitted are provided.

  The teeth 13a of the split core 11 are covered with the coil 13 to form the split stator 7. Further, the stator main body 3 is configured by arranging a plurality of the split stators 7 in an annular shape. It has become. A holding ring 5 described later holds the stator body 3 from the outside, so that the annular arrangement state of the divided stator 7 is held.

  The holding ring 5 has a substantially cylindrical shape formed of a metal material (for example, soft iron (S15C), aluminum, etc.), and surrounds and holds the stator body 3. On the inner peripheral surface of the holding ring 5, a plurality of convex portions (of the present invention) are regularly arranged at intervals in the motor circumferential direction B corresponding to the positions of the concave portions 11 e of the divided cores 11 arranged in an annular shape. (Corresponding to the fitting portion) 5a is provided.

  In addition, at both ends of the holding ring 5 in the motor axial direction C, regularly spaced at intervals in the motor circumferential direction B corresponding to the positions of the recesses 11f and 11g of the divided cores 11 arranged in an annular shape. A plurality of holding pieces 5b and 5c are provided. As shown in FIG. 4, the holding pieces 5 b and 5 c sandwich the divided stators 7 from both sides in the motor axial direction C when the holding ring 5 is externally fitted to the stator body 3.

  The retaining ring 5 is attached as follows, for example. That is, as shown in FIG. 1, only one holding piece 5b, 5c (5b in the configuration of FIG. 2) is bent inward, and the other holding piece 5b, 5c (5c in the configuration of FIG. 1) is erected. The holding ring 5 is externally fitted to the stator body 3, the other holding pieces 5b and 5c are bent inward, and the divided stators 7 are sandwiched by the holding pieces 5b and 5c.

  In the mounted state of the holding ring 5, each convex portion 5 a of the holding ring 5 is fitted into the concave portion 11 e of each divided core 11, whereby the rotation of the stator body 3 in the motor circumferential direction B is reliably stopped, The stator body 3 is held. In addition, the movement of each split core 11 in the motor axial direction C is surely stopped by the holding pieces 5b and 5c of the holding ring 5. At this time, the holding pieces 5b and 5c are fitted in the recesses 11f and 11g of the split core 11.

  As described above, according to the present embodiment, the concave portion 11e is provided on the outer peripheral surface 11d of the yoke portion 11b of each divided core 11 on the outer side in the motor radial direction A, and the plurality of convex portions fitted into the concave portion 11e. Since 5a is provided on the inner peripheral surface of the holding ring 5, the stator body 3 is held by reliably stopping the rotation of the stator body 3 in the motor circumferential direction B by fitting the recess 11e and the protrusion 5a. be able to. For this reason, shrinkage shrinkage can be made unnecessary, and it is possible to prevent the core loss of the split core 11 from being increased due to the compressive stress of the shrinkage shrinkage, or the breakage of the split core 11 made of the powder magnetic material. it can.

  Moreover, since the recessed part 11e is formed so that it may be located in the motor radial direction A outer side of the teeth part 11a about the motor circumferential direction B, the fall of the magnetic characteristic of the split core 11 by forming the recessed part 11e is prevented. it can.

  Moreover, since the split core 11 is formed of a compact magnetic body that can be easily formed, a complicated shape such as the recess 11e of the split core 11 can be easily realized.

  Further, the holding pieces 5b and 5c of the holding ring 5 can reliably prevent the positional deviation of each divided core 11 in the motor axial direction C.

  In Patent Document 2 (Japanese Patent Application Laid-Open No. 2004-242444) mentioned in the description of the background art, the inner core of the stator includes a cylindrical portion and a plurality of teeth arranged along the outer peripheral surface of the cylindrical portion. I have. The stator is accommodated and held inside the case by fitting the tip of the cylindrical portion of the inner core into the groove formed on the inner surface of the case. However, Patent Document 2 does not disclose that the stator is held by providing a concave portion on the outer peripheral surface of the outer core and fitting it into the convex portion of the holding ring.

<Modification>
In addition, as a modified example of the concave portion 11e and the convex portion 5a provided in the split core 11 and the holding ring 5 according to the above-described embodiment, a configuration illustrated in FIG. In this configuration, as shown in FIG. 5, concave and convex fitting portions 21 and 23 that are fitted to the outer peripheral surface 11 d of the split core 11 and the inner peripheral surface of the holding ring 5 are regularly formed in the motor circumferential direction B. This constitutes a spline (in addition, an involute spline may be constructed to further enhance the alignment effect). And when these fitting parts 21 and 23 are in a state of being fitted to each other, between the top parts 21a and 23a and the valley parts 21b and 23b of the fitting parts 21 and 23 corresponding to each other, In a state where the gap S is generated, the side surfaces of the tooth surfaces 21c and 23c of the fitting portions 21 and 23 are in contact with each other. Therefore, when the holding ring 5 is mounted on the outer periphery of the stator body 3 and the fitting portions 21 and 23 are fitted to each other, as shown by the arrow D in FIG. The stress is applied only between the uneven tooth surfaces 21 c of 21, and the stress applied to the yoke portion 11 b through which the magnetic flux passes is dispersed, whereby the iron loss of the split core 11 is improved. Moreover, since the fitting parts 21 and 23 comprise the spline, while the alignment effect is acquired by fitting of the fitting parts 21 and 23, large torque can be hold | maintained reliably.

  Further, in the above-described embodiment, the holding ring 5 is mounted without performing shrinkage shrinkage. However, the retaining ring 5 may be mounted by performing light shrinkage shrinkage. In this case, since the rotation of the stator body 3 is stopped by the fitting of the concave portion 11e and the convex portion 5a, the compressive stress of shrinkage can be suppressed.

  Further, in the above-described embodiment, the holding ring 5 is mounted with one of the holding pieces 5b and 5c standing. However, both the holding pieces 5b and 5c are laid on the inside, The holding ring 5 may be attached by performing a light shrinkage. In this case, it is necessary to set the overhanging dimension of at least one of the holding pieces 5b and 5c to be small in accordance with the shrinkage allowance.

  Moreover, in the above-mentioned embodiment, although the convex part 5a fitted to the recessed part 11e of the division | segmentation core 11 was provided in the holding ring 5, the holding ring 5 was abbreviate | omitted and the convex part 5a was made into the internal peripheral surface of a motor housing. You may make it provide. In this case, the motor core corresponds to the stator core holding member of the present invention.

  Further, in the above-described embodiment, the stator 1 is configured using the split core 11, but the stator 1 may be configured using an integral stator core.

  Moreover, in the above-mentioned embodiment, although the split core 11 was formed using the dust magnetic body, the split core 11 may be a steel plate magnetic body (a magnetic body formed by laminating silicon steel plates), or the split core. 11 may be formed by combining a powder magnetic body and a steel plate magnetic body.

It is a disassembled perspective view of the stator which concerns on one Embodiment of this invention. It is a perspective view of a split core. It is a figure which shows the mode of the magnetic flux produced | generated in a division | segmentation core. It is sectional drawing of a stator. It is sectional drawing which shows the modification of the fitting part provided in a division | segmentation core and a holding ring.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Stator 3 Stator main body 5 Holding ring 5a Convex part 5b, 5c Holding piece 7 Divided stator 11 Divided core 11a Teeth part 11b Yoke part 11c Collar part 11e Concave part 13 Coil 21,23 Fitting part A Motor radial direction B Motor circumferential direction C Motor shaft direction

Claims (8)

A stator core disposed on the outer periphery of the rotor;
A coil sheathed on the teeth portion of the starter core;
A stator core holding member having a substantially annular cross-sectional shape and holding the stator core;
A stator comprising:
The outer peripheral surface of the yoke portion of the stator core on the outer side in the radial direction of the motor and the inner peripheral surface of the stator core holding member facing the outer peripheral surface are provided with concave and convex fitting portions that fit each other. A featured stator. The stator according to claim 1,
The stator, wherein the fitting portion on the stator core side is formed by providing a concave portion on the outer peripheral surface. The stator according to claim 1,
The stator core and the fitting portion of the stator core holding member that are in a mutually fitted state are such that the tooth surface sides of the concave and convex portions are in contact with each other with a gap between the top and the valley of the concave and convex portions. And stator. The stator according to claim 3,
The stator, wherein the fitting portion of the stator core and the stator core holding member is formed by a concavo-convex shape regularly formed in the motor circumferential direction. The stator according to any one of claims 1 to 4,
The stator core is formed of a dust magnetic material. The stator according to any one of claims 1 to 5,
The stator holding member has a substantially cylindrical shape, and holding pieces are provided at both ends in the motor axial direction so as to sandwich and hold the yoke portions of the stator core from both sides in the motor axial direction. A stator core disposed on the outer periphery of the rotor,
A stator core, wherein an uneven fitting portion is provided on an outer peripheral surface of the yoke portion on the outer side in the motor radial direction. A stator core holding member that holds the stator core,
A stator core holding member, wherein an uneven fitting portion is provided on an inner peripheral surface facing the stator core.

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