JP2007135331A - Stator core and stator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a stator core in which space factor of a coil is improved and utilization efficiency of flux is improved by forming a flange and a yoke stretching in the laminating direction of silicon steel plates while suppressing manufacturing cost, and also to provide its related technology. <P>SOLUTION: A split core 11 is constituted by combining a central steel plate body 21 laminating silicon steel plates, teeth green compacts 23 and 25 composed of powder magnetic body, and yoke green compacts 27 and 29. The powder magnetic body portion of the split core 11 is formed while being split into the teeth green compacts 23 and 25 and the yoke green compacts 27 and 29 on both sides of the central steel plate body 21 in the motor axial direction C, respectively. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a stator core configured by combining a silicon steel plate and a powder magnetic material and related technology.

  As this type of conventional stator core, there is one described in Patent Document 1. In this stator core, a molded body made of magnetic powder is applied to the outer periphery of the tooth portion of the core formed by laminating silicon steel plates so that the curvature of the coil winding direction of the tooth portion changes constantly or continuously. ing.

JP 2001-157390 A

  However, in the above-described conventional stator core, the flange portion and the yoke portion projecting in the stacking direction of the silicon steel plate are formed by laminating the silicon steel plate, but these portions are formed of the silicon steel plate, The manufacturing cost of the core is high and practically difficult to implement.

  Therefore, the problem to be solved by the present invention is that the space factor of the coil can be improved, and the flange portion and the yoke portion projecting in the stacking direction of the silicon steel plates are formed while suppressing the manufacturing cost, thereby improving the use efficiency of the magnetic flux. It is to provide a stator core and related technology that can be improved.

  In order to solve the above-mentioned problem, the invention of claim 1 is a stator core configured by combining a silicon steel plate and a magnetic powder body, and is formed by laminating silicon steel plates, from the teeth portion of the stator core to the yoke portion. A central steel plate body and a magnetic powder body, and has a brim portion extending in the stacking direction of the silicon steel plate at an inner end in the motor radial direction, at least on the teeth portion of the central steel plate body Two teeth compacts attached to the corresponding part from both sides in the laminating direction and a magnetic compact, and attached to at least the part corresponding to the yoke part of the central steel plate body from both sides in the laminating direction. Two yoke green compacts.

  According to a second aspect of the present invention, in the stator core according to the first aspect of the present invention, the tooth green compact is superposed on at least a portion of the central steel plate body that extends from the tooth portion to the yoke portion at both end surfaces in the motor axial direction. The yoke green compact is provided with a fitting recess that fits over the yoke-side portion of the tooth green compact, and the yoke-side portion of the tooth green compact and the yoke green compact. The fitting recess is provided with first and second engaging portions that engage with each other to prevent the teeth green compact from coming off from the yoke green compact.

  According to a third aspect of the present invention, there is provided a stator using the stator core according to the first or second aspect of the present invention, the stator core according to the first or second aspect of the present invention, and a coil externally mounted on a tooth portion of the stator core. With.

  According to the first aspect of the present invention, the tooth green compact made of a compacted magnetic material having excellent formability is formed on the portion corresponding to the tooth portion of the central steel plate formed by laminating the silicon steel plates. Since the configuration is attached from both sides in the laminating direction, the shape of the outer peripheral surface of the teeth portion can be easily adjusted to a rounded shape, and as a result, the gap generated between the teeth portion and the coil is reduced. It can be reduced to improve the coil space factor.

  In addition, since the bristle part and the yoke part projecting in the laminating direction of the silicon steel sheet are formed by the tooth compact and the yoke compact composed of the compacted magnetic material having excellent formability, the silicon steel sheet is suppressed while suppressing the manufacturing cost. By forming the flange portion and the yoke portion projecting in the stacking direction, the utilization efficiency of the magnetic flux can be improved.

  In addition, since the magnetic powder magnetic part of the stator core is formed by dividing into a powder green compact and a yoke powder compact on both sides of the silicon steel sheet with the central steel plate sandwiched therebetween, In addition, the shape of the yoke green compact can be simplified, and as a result, the tooth green compact and the yoke green compact can be easily formed. Thereby, for example, the internal density of the tooth green compact and the yoke green compact can be easily increased by press molding, and the strength and magnetic characteristics of the tooth green compact and the yoke green compact can be improved.

  According to the second aspect of the present invention, the tooth compact is configured to prevent the tooth compact from being detached from the yoke compact by the engagement structure by the first and second engaging portions. It can be reliably prevented from falling off.

  According to the third aspect of the present invention, it is possible to provide a high-performance and easy-to-manufacture stator that has high coil space factor and magnetic flux utilization efficiency.

  1 is a cross-sectional view of a main part of a stator according to an embodiment of the present invention, FIG. 2 is an exploded perspective view of the stator of FIG. 1, and FIG. 3 is an exploded perspective view of a split core provided in the stator of FIG. It is. As shown in FIGS. 1 to 3, the stator 1 includes a stator body 3 and a holding ring 5, and is installed on the outer peripheral portion 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. The split core 11 is configured by combining a central steel plate body 21, two tooth green compacts 23 and 25, and two yoke green compacts 27 and 29, and a tooth portion 11 a on which the coil 13 is sheathed. The yoke portion 11b is provided on the outer side of the tooth portion 11a in the motor radial direction 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.

  The central steel plate body 21 is formed by laminating a plurality of silicon steel plates having a substantially T shape in plan view in a state of being insulated from each other in the motor axial direction A, and a portion from the tooth portion 11a to the yoke portion 11b of the split core 11 Is configured. And the overhang | projection part 21a projected over the both sides of the motor circumferential direction B for forming a part of collar part 11c is formed in the motor radial direction A inner side edge part of the center steel plate body 21. As shown in FIG. Further, at the end portion on the outer side in the motor radial direction A of the central steel plate body 21, there are provided overhanging portions 21 b projecting on both sides of the motor circumferential direction B for forming a part of the yoke portion 11 b. In addition, the lamination direction of the silicon steel plate of the central steel plate body 21 and the motor axial direction A are in a parallel relationship.

  Each tooth compact 23, 25 is arranged so as to be superposed on a portion corresponding to the yoke portion 11b from the tooth portion 11a on each end surface of the central steel plate body 21 in the motor axial direction C (note that the tooth compact). The bodies 23 and 25 are preferably bonded to the central steel plate body 21 with an adhesive). As a modification, the shape corresponding to the tooth portion 11b of each tooth compact 23, 25 is shaped so as to wrap the portion corresponding to the tooth portion 11a of the central steel plate body 21 from both sides in the motor axial direction C. Also good.

  The teeth green compacts 23, 25 have motor flanges 11c at their inner ends in the motor radial direction A to form a part of the flange 11c. The projecting portions 23a and 25a projecting in a direction away from the projecting portion 23a are provided. On the outer peripheral surface on the outer side in the motor axial direction C at the outer end in the motor radial direction A of each tooth green compact 23, 25, substantially convex first engaging portions 23b, 25b are projected. The first engaging portions 23b and 25b are adapted to engage with second engaging portions 27b and 29b of yoke compacts 27 and 29 described later. In addition, outer peripheral surfaces 23c and 25c (particularly, edge portions on both edges in the motor circumferential direction B) facing outward in the motor axial direction C in portions corresponding to the tooth portions 11a of the tooth compacts 23 and 25 are rounded. (For example, a substantially cylindrical shape).

  Further, each of the yoke compacts 27 and 29 is provided with fitting recesses 27a and 29a that are externally fitted to portions corresponding to the yoke portions 11b of the corresponding tooth compacts 23 and 25, and the motor of the central steel plate body 21 is provided. A portion corresponding to the yoke portion 11b on each end surface in the axial direction C is disposed so as to overlap from above the tooth compacts 23 and 25 (note that the yoke compacts 27 and 29 are connected to the central steel plate body 21 and the teeth pressure). It is preferable to adhere to the powders 23 and 25 with an adhesive). The yoke compacts 27 and 29 form part of the yoke portion 11b.

  In the fitting recesses 27a and 29a of the respective yoke compacts 27 and 29, second engagements that are substantially concave and engage with the first engaging portions 23b and 25b of the corresponding tooth compacts 23 and 25, respectively. The joint portions 27b and 29b are recessed. Then, the fitting recesses 27a and 29a of the yoke compacts 27 and 29 are externally fitted to the portions of the teeth compacts 23 and 25 on the yoke portion 11b side, and the first engaging portions 23b and 25b and the second engagement portions 23b and 25b are fitted. The tooth compacts 23 and 25 are held against the yoke compacts 27 and 29 by being engaged with the engaging portions 27b and 29b. More specifically, the first engaging portions 23b and 25b and the second engaging portions 27b and 29b have tapered inclined surfaces 31 and 33 (see FIG. 1) that engage with each other. The surfaces are engaged with each other so that they can be prevented from coming off. As a modification of the engagement structure of the first engagement portions 23b and 25b and the second engagement portions 27b and 29b, the engagement surface may be stepped as shown in FIG.

  The teeth green compacts 23 and 25 and the yoke green compacts 27 and 29 are made of a metal magnetic powder or a powder magnetic material obtained by bonding a metal magnetic powder covered with a predetermined insulating coating with a resin, and the powder magnetic properties. It is formed by filling a predetermined mold for molding, pressurizing and compressing, and then heat-treating.

  The teeth 13b 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 to be described later holds the stator body 3 by tightening it from the outside, whereby the annular arrangement state of the divided stator 3 is held.

  The holding ring 5 has a substantially cylindrical shape formed of a metal material, and is manufactured by punching with a press or the like and making it into a cylindrical shape by deep squeezing or the like.

  The retaining ring 5 is attached by heating the retaining ring 5 and shrinking the retaining ring 5 on the outer periphery of the stator body 3.

  With such a configuration, the portions of the flange portions 11c of each divided core 11 that project to both sides in the motor circumferential direction B are configured by the projecting portions 21a of the central steel plate body 21 and the projecting portions 23a and 25a of the tooth compacts 23 and 25. In addition, the portion of the brim portion 11c that projects outward in the motor axial direction C is configured by the projecting portions 23a and 25a of the tooth compacts 23 and 25.

  In addition, the portion of each divided core 11 that protrudes to both sides of the motor circumferential direction B in the yoke portion 11b is constituted by the protruding portion 21b of the central steel plate body 21 and the yoke compacts 27 and 29, and the motor shaft direction of the yoke portion 11b. The portion extending outward from C is constituted by yoke compacts 27 and 29.

  As described above, according to the present embodiment, the configuration as described above can provide the stator 1 with high space factor of the coil 13 and high use efficiency of the magnetic flux, high performance and easy manufacture.

  That is, in more detail, since the tooth green compacts 23 and 25 are arranged on both end surfaces in the motor axial direction C of the central steel plate body 21 in the tooth portion 11a of each divided core 11, it has a roundness. The outer peripheral surfaces of the teeth compacts 23 and 25 can round the outer peripheral shape of the tooth portion 11b. As a result, the gap formed between the tooth portion 11a and the coil 13 is reduced, and the coil 13 is occupied. The rate can be improved.

  Further, a portion of the flange portion 11c and a portion of the yoke portion 11b projecting outward in the motor axial direction C by the tooth powder compacts 23 and 25 and the yoke powder compacts 27 and 29 made of compacted magnetic material having excellent formability. Therefore, the flange portion 11c and the yoke portion 11b projecting in the motor axial direction C can be formed while suppressing the manufacturing cost, and the utilization efficiency of the magnetic flux can be improved.

  Further, the powder magnetic material portion of the split core 11 is divided into teeth powder compacts 23 and 25 and yoke powder compacts 27 and 29 on both sides in the motor axial direction C with the central steel plate body 21 interposed therebetween. Therefore, the shapes of the tooth green compacts 23 and 25 and the yoke green compacts 27 and 29 can be simplified. As a result, the tooth green compacts 23 and 25 and the yoke green compacts 27 and 29 can be easily formed. It can be a shape. Thus, for example, the internal density of the tooth compacts 23 and 25 and the yoke compacts 27 and 29 can be easily increased by press molding. Strength and magnetic properties can be improved.

  Further, the tooth compacts 23 and 25 are prevented from coming off from the yoke compacts 27 and 29 by the engaging structure of the first engaging portions 23b and 25b and the second engaging portions 27b and 29b. Therefore, it is possible to reliably prevent the tooth green compacts 23 and 25 from dropping out to the rotor side.

It is principal part sectional drawing of the stator which concerns on one Embodiment of this invention. It is a disassembled perspective view of the stator of FIG. It is a disassembled perspective view of the division | segmentation core with which the stator of FIG. 1 is equipped. It is sectional drawing which shows the modification of the engagement structure of teeth compact and yoke compact.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Stator 3 Stator main body 5 Holding ring 7 Split stator 11 Split core 11a Teeth part 11b Yoke part 11c Collar part 13 Coil 21 Central steel plate body 23, 25 Teeth green compact 23a, 25a Overhang part 23b, 25a 1st engaging part 27, 29 Yoke green compact 27a, 29a Fitting recess 27b, 29b Second engaging part A Motor radial direction B Motor circumferential direction C Motor axial direction

Claims (3)

A stator core configured by combining a silicon steel plate and a magnetic powder magnetic body,
A central steel plate body that is formed by laminating silicon steel plates, and that constitutes a portion from the teeth portion of the stator core to the yoke portion,
It is formed of a powdered magnetic body, has a brim portion that protrudes in the lamination direction of the silicon steel plate at the inner end in the motor radial direction, and at least a portion corresponding to the tooth portion of the central steel plate body from both sides in the lamination direction Two attached green compacts,
Two yoke green compacts formed from a magnetic dust body and attached from both sides in the stacking direction to at least a portion corresponding to the yoke part of the central steel plate body;
A stator core comprising: The stator core according to claim 1, wherein
The tooth green compact is arranged so as to overlap at least a portion of the central steel plate body that extends from the tooth portion to the yoke portion on both end surfaces in the motor axial direction.
The yoke compact is provided with a fitting recess that fits around the yoke-side portion of the teeth compact,
The yoke-side portion of the tooth green compact and the fitting recess of the yoke green compact are engaged with each other to prevent the tooth green compact from coming off from the yoke green compact. A stator core provided with a second engagement portion. A stator using the stator core according to claim 1 or 2,
The stator core according to claim 1 or 2,
A coil sheathed on the teeth portion of the stator core;
A stator comprising:

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