JP4680800B2 - Stator core and stator - Google Patents

Description

  The present invention relates to a stator core configured by combining a steel plate magnetic body and a dust magnetic body and held by shrink bakeling, and a related technology.

  When the shrink core ring is attached to the stator core, a large stress is applied to the stator core due to the shrink flange, and the iron loss of the core is deteriorated. For example, Patent Document 1 discloses a countermeasure technique regarding this point.

  Further, since the iron loss due to stress strain is easily deteriorated in the dust magnetic body as compared with the steel plate magnetic body formed by laminating silicon steel plates, a countermeasure against shrinkage stress is required. For example, Patent Document 2 discloses a stator core having a sandwich structure in which a steel plate magnetic body is sandwiched between powder magnetic bodies from both sides.

Japanese Patent Laid-Open No. 2005-20856 JP 2002-369418 A

  However, in the case of a core that combines a steel plate magnetic body and a powder magnetic body, the material strength of the powder magnetic body is insufficient. The body may be destroyed.

  Therefore, the problem to be solved by the present invention is to provide a stator core capable of preventing the destruction of the dust magnetic body due to shrinkage stress or the like in the stator core formed by combining the steel plate magnetic body and the dust magnetic body, and related technology. is there.

  In order to solve the above problems, the invention of claim 1 is a stator core configured by combining a steel plate magnetic body and a powder magnetic body, and is held by baked bamelling, and is formed by laminating silicon steel plates, Two compacts formed from a steel plate body constituting a portion from the teeth portion of the stator core to the yoke portion and a dust magnetic body and joined to at least a portion corresponding to the yoke portion of the steel plate body from both sides in the motor axial direction And the end surface of the steel plate body on the outer side in the motor radial direction of the yoke portion protrudes outward in the motor radial direction from the end surface on the outer side in the motor radial direction of the two green compacts.

  Moreover, in invention of Claim 2, in the stator core of Claim 1, the protrusion amount from the end surface of the motor radial direction outer side of the two green compacts in the end surface of the motor radial direction outer side of the said steel plate body However, it is set to be larger than the gap interval between the rotor and the stator core.

  According to a third aspect of the present invention, there is provided a stator core composed of a combination of a steel plate magnetic body and a dust magnetic body and held by baking bakeling in a state of being arranged in a plurality of rings, and silicon steel plates are laminated. 2 formed by a steel plate body forming a portion from the teeth portion to the yoke portion of the stator core and a dust magnetic body, and joined to at least a portion corresponding to the yoke portion of the steel plate body from both sides in the motor axial direction. The end surface in the motor circumferential direction of the steel plate body in the yoke portion protrudes in the motor circumferential direction from the end surfaces in the motor circumferential direction of the two green compacts.

  According to a fourth aspect of the present invention, there is provided a stator using the stator core according to any one of the first to third aspects, the stator core according to any one of the first to third aspects, and the teeth of the stator core. A coil that is externally mounted on the portion, and a bake ring that holds the stator core.

  According to the first aspect of the present invention, in the stator core in which the green compact is disposed on both sides in the motor axial direction of the steel plate at least in the yoke portion, the outer side in the motor radial direction of the steel plate in the yoke portion. Since the end surface of the two protrudes outward in the motor radial direction from the end surface on the outer side in the motor radial direction of the two green compacts, it is possible to reduce or eliminate the stress that the green compact receives from baking bake ring, This can prevent the green compact from being damaged due to shrinkage stress or the like.

  According to the second aspect of the present invention, the amount of protrusion of the two green compacts from the end surface on the outer side in the motor radial direction of the steel core body of the stator core between the rotor and the stator core Since it is set to be larger than the gap interval between them, the stress from the shrinking battering acting on the green compact in the yoke portion of the stator core can be made zero, and the motor radial direction of the two green compacts in the yoke portion Magnetic flux leaking from the outer end face to the baking bake ring side can be reduced, and motor efficiency can be improved.

  According to a third aspect of the present invention, in the split type stator core in which the green compact is arranged at least on both sides in the motor axial direction of the steel plate body, the motor circumferential direction of the steel plate body in the yoke portion is provided. The end faces of the two green compacts protrude in the motor circumferential direction from the end faces in the motor circumferential direction of the two green compacts. Since the stress acts between them, the stress in the circumferential direction of the motor that the green compact receives can be reduced. As a result, the green compact can be prevented from being broken due to shrinkage stress or the like.

  According to the fourth aspect of the invention, the green compact can be prevented from being broken due to shrinkage stress or the like, so that the green compact in the stator can be prevented from being damaged during the manufacturing process or use.

<First Embodiment>
<Overall configuration>
1 is a cross-sectional view of a main part of a stator according to a first embodiment of the present invention, FIG. 2 is an exploded perspective view of the stator of FIG. 1, and FIG. 3 is a cross-sectional view of a split core provided in the stator of FIG. FIG. 4 is an exploded perspective view of the split core of FIG. As shown in FIGS. 1 to 4, the stator 1 includes a stator body 3 and a shrinking bake ring 5, 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. The split core 11 is configured by combining a steel plate body 21 and two green compacts 23 and 25, and has a tooth portion 11a on which the coil 13 is sheathed, and a motor radial direction A outer side of the tooth portion 11a. And a yoke portion 11b provided on the inner surface. 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 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 formed. It is composed. And the overhang | projection part 21a which protrudes in the motor circumferential direction B both sides for forming a part of collar part 11c is formed in the motor radial direction A inner side edge part of the steel plate body 21. As shown in FIG. In addition, at the end portion of the steel plate body 21 on the outer side in the motor radial direction A, there are provided overhanging portions 21b projecting on both sides of the motor circumferential direction B for forming a part of the yoke portion 11b. In addition, the lamination direction of the silicon steel plate of the steel plate body 21 and the motor axial direction A have a parallel relationship.

  Further, the green compacts 23 and 25 are superposed on portions corresponding to the yoke portions 11b from the tooth portions 11a on the respective end surfaces in the motor axial direction C of the steel plate body 21, and are joined by an adhesive. As a modification, the shape corresponding to the tooth portion 11b of each of the green compacts 23 and 25 may be shaped so as to wrap the portion corresponding to the tooth portion 11a of the steel plate body 21 from both sides in the motor axial direction C. .

  At the end portions of the green compacts 23 and 25 on the inner side in the motor radial direction A, both sides of the motor circumferential direction B and the outer sides in the motor axial direction C (separate from the steel plate body 21) are formed. Overhanging portions 23a and 25a are provided. Further, overhangs projecting outward in both sides of the motor circumferential direction B and outward in the motor axial direction C for forming a part of the yoke portion 11b at the end portions of the green compacts 23, 25 on the outer side in the motor radial direction A. 23b and 25b are provided. In addition, the outer peripheral surfaces 23c and 25c (particularly the edge portions on both edges in the motor circumferential direction B) facing outward in the motor axial direction C in the portions corresponding to the tooth portions 11a of the green compacts 23 and 25 are rounded. It has a shape (for example, a substantially cylindrical shape).

  The green compacts 23 and 25 are made of a metal magnetic powder or a powder magnetic body in which a metal magnetic powder covered with a predetermined insulating film is bonded with a resin, and the powder magnetic material is formed into a predetermined mold. After filling, pressurizing and compressing, it is formed by heat treatment.

  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. Further, the shrinking baffling 5 described later holds the stator body 3 by tightening from the outside, whereby the annular arrangement state of the divided stator 3 is maintained.

  The baked battering 5 has a substantially cylindrical shape formed of a metal material, and is manufactured by punching with a press or the like and forming a cylinder by deep squeezing or the like.

  Attachment of the shrink shrinking ring 5 is performed by heating the shrink shrinking ring 5 and shrinking the shrink shrinking ring 5 around the outer periphery of the stator body 3.

  With such a configuration, the portions of the flange portions 11c of the divided cores 11 that project to both sides in the motor circumferential direction B are constituted by the projecting portions 21a of the steel plate body 21 and the projecting portions 23a and 25a of the green compacts 23 and 25. Further, 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 green compacts 23 and 25.

  Further, portions of the yoke portions 11b of the divided cores 11 that project to both sides of the motor circumferential direction B are constituted by the projecting portions 21b of the steel plate body 21 and the projecting portions 23b and 25b of the green compacts 23 and 25, and the yoke portions 11b. The portion extending outward in the motor axial direction C is formed by the overhang portions 23b and 25b of the green compacts 23 and 25.

<Projection structure of steel plate at yoke part>
In the present embodiment, the end surface 21c on the outer side in the motor radial direction A of the steel plate 21 in the yoke portion 11b of the split core 11 is the end surface 23d on the outer side in the motor radial direction A of the two green compacts 23 and 25. The steel plate body 21 and the green compacts 23 and 25 are joined in a state of projecting at a predetermined projecting amount D1 outward of the motor radial direction A from 25d.

  For example, the outer diameter dimension of the stator body 3 is 280 mm, the thickness dimension S1 in the motor axial direction C of the yoke portion 11b of each divided core 11 is 50 mm, and the thickness dimension S2 in the motor axial direction C of the steel sheet body 21 is 16.8 mm. Thus, when the tightening allowance of the baking bake ring 5 is about 0.7 mm, the protrusion D1 is set to 0.30 mm, for example.

  FIG. 5 is a diagram showing a numerical analysis result when shrink shrinkage is performed under the above setting conditions. Moreover, FIG. 6 shows the numerical analysis result about the relationship between the change of the amount of protrusion, and the change of the shrinkage stress which a green compact receives when changing the amount of protrusion of a steel plate body under said setting conditions. It is a graph. From the numerical analysis results of FIG. 6, it can be seen that the stress applied to the green compacts 23 and 25 when the protrusion amount D1 is 0.3 mm is reduced by about 25% compared to when the protrusion amount D1 is zero. Further, from the numerical analysis result of FIG. 5, even if there is a gap corresponding to the protruding amount D1 (0.3 mm) between the green compacts 23 and 25 and the baking baffling 5 in the yoke portion 11b of the divided core 11, It can be seen that the green compacts 23 and 25 and the ring 5 are in close contact with each other due to the deformation of the ring 5 or the like due to the swallow.

  As described above, according to the present embodiment, in the stator 1 in which at least the yoke portion 11b of the split core 11 has a sandwich structure of the steel plate body 21 and the green compacts 23 and 25 on both sides in the motor axial direction C. The end surface 21c on the outer side in the motor radial direction A of the steel plate body 21 in the yoke portion 11b protrudes outward in the motor radial direction A from the end surfaces 23d and 25d on the outer side in the motor radial direction A of the green compacts 23 and 25. Therefore, the stress that the green compacts 23 and 25 receive from the shrink shrinking 5 can be reduced, and thereby the destruction of the compacts 23 and 25 due to the shrink shrink stress or the like can be prevented.

  In addition, since the tooth compacts 23 and 25 are arranged on both end surfaces in the motor axial direction C of the steel plate body 21 in the tooth portion 11a of each divided core 11, the teeth compact 23 having roundness is disposed. 25, the outer peripheral shape of the tooth portion 11b can be rounded, and as a result, the gap generated between the tooth portion 11a and the coil 13 can be reduced, and the space factor of the coil 13 can be improved.

  In addition, the compacts 23 and 25 made of compacted magnetic material having excellent moldability form the flange portion 11c portion and the yoke portion 11b portion projecting outward in the motor axial direction C, thereby reducing the manufacturing cost. However, the flange portion 11c and the yoke portion 11b projecting in the motor axial direction C can be formed to improve the utilization efficiency of the magnetic flux.

  As a modification of the protruding structure of the steel plate body 21 in the yoke portion 11b of the split core 11 shown in FIGS. 1 and 3 and the like, the configuration shown in FIG. 7 can be adopted. That is, as shown in FIG. 7, the protruding amount D1 of the two green compacts 23 and 25 from the end surfaces 23d and 25d on the outer side in the motor radial direction A on the end surface 21c on the outer side in the motor radial direction A of the plate body 21. May be larger than the gap interval Dg between the rotor 31 and the split core 11 (more preferably, the gap interval Dg is twice or more). As a result, the stress from the bake ring 5 acting on the green compacts 23 and 25 in the yoke portion 11b of the split core 11 can be reduced to zero, and the motor diameters of the two green compacts 23 and 25 in the yoke portion 11b can be reduced. The magnetic flux leaking from the end faces 23d and 25d on the outer side in the direction A toward the shrink bake ring 5 can be reduced, and the motor efficiency can be improved.

Second Embodiment
FIG. 8 is a side view of the split core provided in the stator according to the second embodiment of the present invention as seen from the motor radial direction outward side. The stator 1 according to the present embodiment is substantially different from the stator 1 according to the first embodiment described above only in the protruding form of the steel plate body 21 in the yoke portion 11b of the split core 11, and in the portions corresponding to each other, The same reference numerals are assigned and description is omitted.

  In the present embodiment, as shown in FIG. 8, end surfaces 21 d and 21 e on both sides of the steel plate 21 in the motor circumferential direction B in the yoke portion 11 b of the split core 11 are on both sides of the two green compacts 23 and 25 in the motor circumferential direction B. The end surfaces 23e, 23f, 25e, and 25f are protruded by a predetermined protrusion amount D2 on both sides of the motor circumferential direction B. In the case of the first embodiment, the end surfaces 21d, 23e, and 25e and the end surfaces 21e, 23f, and 25f are flush with each other.

  For example, the outer diameter dimension of the stator body 3 is 300 mm, the thickness dimension S1 in the motor axial direction C of the yoke portion 11b of each divided core 11 is 50 mm, and the thickness dimension S2 in the motor axial direction C of the steel sheet body 21 is 16.8 mm. Thus, when the tightening allowance of the baking bake ring 5 is about 0.7 mm, the protrusion D2 is set to 0.03 mm, for example.

  In the present embodiment, the steel plate body 21 is protruded on both sides in the motor circumferential direction B in the yoke portion 11b. However, the steel plate body 21 may be protruded only in the motor circumferential direction B side. In this case, the amount of protrusion is set to double that of the structure protruding on both sides.

  As described above, according to the present embodiment, when the divided cores 11 are arranged in an annular shape, stress acts mainly between the steel plate bodies 21 in the yoke portions 11b of the adjacent divided cores 11. Therefore, the stress in the motor circumferential direction B received by the green compacts 23 and 25 in the yoke portion 11b of the split core 11 during shrinkage can be reduced. As a result, the compacts 23 and 25 are broken due to shrinkage stress or the like. Can be prevented.

<Modification>
As a modification of the first and second embodiments described above, the techniques according to these embodiments may be used in combination. That is, the end surface 21c on the outer side in the motor radial direction A of the steel plate body 21 in the yoke portion 11b is more outward in the motor radial direction A than the end surfaces 23d and 25d on the outer side in the motor radial direction A of the green compacts 23 and 25. At least one of the end surfaces 21d and 21e of the steel plate 21 in the motor circumferential direction B of the yoke portion 11b is projected from the end surfaces 23e, 23f, 25e, and 25f of the two green compacts 23 and 25 in the motor circumferential direction B. Also, it may be protruded in the motor circumferential direction B.

  In the first and second embodiments, the green compacts 23 and 25 may be divided into a portion corresponding to the tooth portion 11a and a portion corresponding to the yoke portion 11b.

It is principal part sectional drawing of the stator which concerns on 1st Embodiment of this invention. It is a disassembled perspective view of the stator of FIG. It is sectional drawing of the split core with which the stator of FIG. 1 is equipped. It is a disassembled perspective view of the division | segmentation core of FIG. It is a figure which shows the numerical-analysis result of a shrink shrink. It is a graph which shows the numerical analysis result regarding the relationship between the protrusion amount of a steel plate body, and the shrinkage stress which a compact compact receives. It is a figure which shows the modification of the structure shown in FIG. It is the side view seen from the motor radial direction outward side of the split core with which the stator which concerns on 2nd Embodiment of this invention is equipped.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Stator 3 Stator main body 5 Bake bake ring 7 Split stator 11 Split core 11a Teeth part 11b Yoke part 11c Collar part 13 Coil 21 Steel plate body 23, 25 Compact 23a, 23b, 25a, 25b Overhang part 31 Rotor A Motor radial direction B Motor circumferential direction C Motor shaft direction

Claims (4)

A stator core composed of a combination of a steel plate magnetic body and a powder magnetic body, and held by baked bamelling,
A steel plate body formed by laminating silicon steel plates, constituting a portion from the teeth portion of the stator core to the yoke portion,
Two green compacts that are formed of powder magnetic material and are joined from both sides in the motor axial direction to a portion corresponding to at least the yoke portion of the steel plate body;
With
A stator core characterized in that an end surface on the outer side in the motor radial direction of the steel plate body in the yoke portion protrudes outward in the motor radial direction from an end surface on the outer side in the motor radial direction of the two green compacts. . The stator core according to claim 1, wherein
The amount of protrusion of the two green compacts from the end surface on the outer side in the motor radial direction on the end surface on the outer side in the motor radial direction of the steel plate body is set to be larger than the gap interval between the rotor and the stator core. A stator core characterized by that. A stator core that is configured by combining a steel plate magnetic body and a dust magnetic body, and is held by baking bakeling in a state of being arranged in a ring shape,
A steel plate body formed by laminating silicon steel plates, constituting a portion from the teeth portion of the stator core to the yoke portion,
Two green compacts that are formed of powder magnetic material and are joined from both sides in the motor axial direction to a portion corresponding to at least the yoke portion of the steel plate body;
With
A stator core, wherein an end surface in the motor circumferential direction of the steel plate body in the yoke portion protrudes in a motor circumferential direction from end surfaces in the motor circumferential direction of the two green compacts. A stator using the stator core according to any one of claims 1 to 3,
The stator core according to any one of claims 1 to 3,
A coil sheathed on the teeth portion of the stator core;
Baked bamelling that holds the stator core;
A stator comprising:

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