JP2011109813A - Stator core - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a laminated steel plate to compose a divided core for preventing deformation, such as buckling, turn-up, or floating. <P>SOLUTION: A stator core 1 is integrally configured such that a divided core 2 configured by laminating a plurality of steel plates 11A and 11B is adjoined and arranged on a circumference, and by being pressed by a fixing ring 3 mounted on an outer periphery of the plurality of divided cores 2. In the plurality of steel plates 11A and 11B which configure each divided core 2, the steel plate 11A placed at an outermost place is bent outward with a surface contacting an adjacent divided core 2. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to a stator core used for a stator of a motor.

  Conventionally, as a technique of this type, Patent Document 1 below describes a split type stator core configured by a plurality of split cores split in the circumferential direction. A fastening ring is attached to the outer periphery of the plurality of divided cores arranged in an annular shape. The plurality of split cores are integrally fastened by the fastening ring. Here, in order to align the plurality of divided cores in an annular shape with high accuracy and to make the stator core withstand the rotational torque of the rotor when the motor is configured, a compression force is applied to the plurality of divided cores by a fastening ring. Has been. For example, the compression force is generated by shrink fitting the fastening ring. In addition to shrink fitting, it is also conceivable to tighten the fastening ring with a fastening bolt in order to apply a compressive force to the plurality of split cores.

  On the other hand, Patent Document 2 below describes that a split type stator core is manufactured by stacking a plurality of steel plates (divided core sheets) to form a split core and combining the split cores into a plurality of annular shapes. ing. With regard to this stator core as well, it is conceivable that a fastening ring is shrink fitted on the outer periphery of a plurality of divided cores arranged in an annular shape.

JP 2007-215330 A JP 2009-38915 A JP 2000-295801 A JP 2009-124863 A JP 2009-089482 A

  However, in the split-type stator core described in Patent Document 2, when a plurality of split cores are fastened by a method such as shrink fitting, a large compressive stress is generated on the abutment surface of the adjacent split cores. Here, since each divided core is composed of a plurality of stacked steel plates, there is a possibility that deformation such as buckling, turning, and floating occurs in a part of the steel plates. In the worst case, the split core may be displaced or fall off due to stress loss.

  The present invention has been made in view of the above circumstances, and the purpose thereof is to arrange a plurality of divided cores adjacent to each other on the circumference, and tighten the outer periphery with a fastening ring to compress the divided cores. An object of the present invention is to provide a stator core capable of suppressing deformation such as buckling, turning, and floating of laminated steel plates constituting the steel plate.

  In order to achieve the above-mentioned object, the invention according to claim 1 is characterized in that a plurality of divided cores configured by laminating a plurality of steel plates are arranged adjacent to each other on the circumference, and the plurality of divided cores are arranged on the outer periphery. In the stator core that is compressed by the attached fastening means and integrally fastened, the outer steel plate located on the outermost side among the plurality of steel plates constituting each divided core includes a surface that contacts the adjacent divided core and is plastically deformed. The intent is that

  According to the configuration of the invention, the outer steel plate constituting the split core is plastically deformed including the surface in contact with the adjacent split core, so that the rigidity against the compressive stress of the split core by the fastening means is increased.

  In order to achieve the above object, the invention described in claim 2 is that, in the invention described in claim 1, the entire outer peripheral edge of the outer steel plate is bent for each divided core.

  According to the configuration of the invention, in addition to the action of the invention according to claim 1, since the entire outer peripheral edge of the outer steel plate is bent, the rigidity against the compressive stress of the split core by the fastening means is increased.

  In order to achieve the above object, the invention described in claim 3 is that, in the invention described in claim 1, only the two corners of the outer peripheral edge of the outer steel plate are bent for each divided core.

  According to the configuration of the invention, in addition to the action of the invention according to claim 1, since only the corners of the outer peripheral edge of the outer steel plate are bent, the rigidity of the split core is increased and the processing of the outer steel plate is compared. Easy.

  In order to achieve the above object, the invention according to claim 4 is the invention according to claim 1, wherein for each divided core, an outer steel plate located on the outermost side and at least one inner steel plate adjacent to the outer steel plate. The gist is that the entire outer periphery is bent.

  According to the configuration of the invention, in addition to the action of the invention according to claim 1, since the entire outer peripheral edge of the outer steel plate and at least one inner steel plate adjacent to the outer steel plate is bent, it is divided by the fastening means. The rigidity against compressive stress of the core is further increased.

  In order to achieve the above object, the invention according to claim 5 is the invention according to claim 1, wherein, for each divided core, the outer steel plate located on the outermost side and at least one inner steel plate adjacent to the outer steel plate are provided. It is intended that only both corners of the outer peripheral edge are bent.

  According to the configuration of the invention, in addition to the action of the invention according to claim 1, since only both corners of the outer peripheral edge of the outer steel plate and at least one inner steel plate adjacent to the outer steel plate are bent, the fastening means The rigidity with respect to the compressive stress of the split core due to is increased, and the processing of the outer steel plate and the inner steel plate is relatively easy.

  According to the invention described in claim 1 or 2, even if a plurality of split cores are fastened and compressed by fastening means to constitute a stator core, the stacked steel plates constituting the individual split cores are buckled. , Turning and floating deformation can be suppressed.

  According to the invention described in claim 3, in addition to the invention described in claim 1, it is possible to easily manufacture the split core by an amount that allows easy processing of the outer steel plate.

  According to the invention described in claim 4, in contrast to the invention described in claim 1, deformations such as buckling, turning, and floating can be strongly suppressed with respect to the laminated steel plates constituting individual divided cores. .

  According to the invention described in claim 5, in contrast to the invention described in claim 1, deformations such as buckling, turning up, and floating can be strongly suppressed with respect to the laminated steel plates constituting individual divided cores. . In addition, with respect to the invention described in claim 4, it is possible to easily manufacture the split core by the amount that the outer steel plate and the inner steel plate are easily processed.

The top view which concerns on 1st Embodiment and shows a split type stator core. The top view which concerns on the same embodiment and shows a part of stator core. The AA sectional view taken on the line of FIG. 2 which shows the stator core according to the same embodiment. The flowchart which shows the manufacturing method of a split core according to the embodiment. Sectional drawing according to 2nd Embodiment and applying to FIG. Sectional drawing which concerns on 3rd Embodiment and applies to FIG. The top view which concerns on 4th Embodiment and applies to FIG.

<First Embodiment>
Hereinafter, a first embodiment in which a stator core of the present invention is embodied will be described in detail with reference to the drawings.

  FIG. 1 is a plan view showing a split type stator core 1 in this embodiment. FIG. 2 is a plan view showing a part of the stator core 1. In this stator core 1, a plurality of divided cores 2 are arranged adjacent to each other on the circumference, and the plurality of divided cores 2 are compressed and fastened together by a fastening ring 3 as fastening means mounted on the outer periphery. .

  Each divided core 2 constituting the stator core 1 includes a yoke portion 2 a constituting the outer peripheral portion of the stator core 1 and a teeth portion 2 b protruding from the yoke portion 2 a toward the center of the stator core 1. In the stator core 1, a slot 4 for mounting a coil is formed between the tooth portions 2 b of the adjacent divided cores 2 and 2.

  Here, in order to align the plurality of split cores 2 in an annular shape with high accuracy and to make the stator core 1 able to withstand the rotational torque of the rotor when the motor is configured, the plurality of split cores 2 are attached to the fastening rings 3. A compressive force is applied. In this embodiment, this compression force is generated by shrink-fitting the fastening ring 3 to the outer periphery of the plurality of split cores 2. Due to this compressive force, a relatively large compressive stress is generated on the abutting surface 5 of the yoke portion 2a of the adjacent split cores 2 and 2.

  FIG. 3 shows the stator core 1 by a cross-sectional view taken along line AA of FIG. The split core 2 is configured by laminating a plurality of steel plates 11A and 11B in the axial direction of the stator core 1 (vertical direction in FIG. 3), that is, in the axial direction of the split core 2. The split core 2 of this embodiment has a structure that can resist the compressive stress generated at the abutting surface 5 that is the side surface of the yoke portion 2a. That is, as shown in FIG. 3, among the stacked steel plates 11A and 11B constituting the split core 2, two outer steel plates 11A positioned on the upper and lower outermost sides are adjacent to the split cores 2 and 2 respectively adjacent to each other. It is plastically deformed including the contacting surface. Specifically, as shown in FIG. 3, in this embodiment, all of the outer peripheral edges 11 a of the outer steel plates 11 </ b> A located on the upper side and the lower side of the split core 2 are outside in the axial direction of the split core 2 (in FIG. 3. It is bent in the vertical direction.

  Here, an example of the manufacturing method of the split core 2 of this embodiment is demonstrated. FIG. 4 is a flowchart showing this manufacturing method.

  In order to manufacture the split core 2, first, in the “steel plate material supplying step” of FIG. 4, the steel plate material is supplied to a predetermined manufacturing apparatus (not shown).

  Next, in the “integrated press process” of FIG. 4, first, (1) “core shape formation of steel sheet” is performed. That is, the individual steel plates 11A and 11B having a part of the outer shape of the split core 2 are formed by press-forming the supplied steel plate material. Next, (2) “plastic deformation of the steel sheet” is performed. That is, for the outer steel plate 11A located on the outermost side of the split core 2, the entire outer peripheral edge 11a is bent obliquely. This bending angle is arbitrarily determined. Thereafter, (3) “final punching / lamination / blurring of steel plates” is performed. That is, the steel plates 11A and 11B processed in the above (1) and (2) are joined together by a known “da blurring” while being laminated. That is, in this embodiment, the “plastic deformation of the steel sheet” is performed in the same series of “integrated press process” as “the core shaping of the steel sheet” and “final punching / lamination / blurring of the steel sheet”. It has become.

  Thereby, the split core 2 shown in FIGS. 1 to 3 is completed. In this way, a plurality of split cores 2 are manufactured, arranged adjacent to each other on the circumference, and shrink-fitted with the fastening ring 3 to complete the stator core 1 as shown in FIG.

  According to the stator core 1 of this embodiment described above, the outer steel plate 11A constituting the split core 2 is plastically deformed including the surfaces in contact with the adjacent split cores 2 and 2, so that the split core by the fastening ring 3 is used. The rigidity against compressive stress of 2 is increased. Specifically, since the entire outer peripheral edge 11a of the outer steel plate 11A is bent, the rigidity of the split core 2 against the compressive stress is increased. That is, the axial strength of the split core 2 is increased. As a result, even if a plurality of split cores 2 are arranged adjacent to each other on the circumference to form the stator core 1 and the outer periphery thereof is fastened by the fastening ring 3 and compressed, the split cores 2 are stacked. With respect to the plurality of steel plates 11A and 11B, deformation such as buckling, turning, and floating can be suppressed. For this reason, in the stator core 1, it is possible to prevent the position shift and dropout of the split core 2 due to stress loss.

  Further, in this embodiment, in order to manufacture the split core 2, “plastic deformation of the steel plate” is the same series of “consistently” as “core shaping of the steel plate” and “final punching / lamination / blurring of steel plate”. It is performed in the “pressing process”. For this reason, it is not necessary to separately perform “plastic deformation of the steel plate”, and the manufacturing process of the split core 2 can be simplified.

Second Embodiment
Next, a second embodiment in which the stator core of the present invention is embodied will be described in detail with reference to the drawings.

  In the following description, the same components as those in the first embodiment are denoted by the same reference numerals, description thereof is omitted, and different points are mainly described.

  FIG. 5 shows a split core 2 of this embodiment in a cross-sectional view similar to FIG. In this embodiment, for each divided core 2, all of the outer peripheral edges 11a of the outer steel plate 11A located on the outermost side and one inner steel plate 11B adjacent to the outer steel plate 11A are bent outward. That is, the configuration differs from that of the first embodiment in which only the outer steel plate 11A is bent, in that all the outer peripheral edges 11a of the two steel plates 11A and 11B closer to the outer side are bent outward.

  Therefore, in this embodiment, since the entire outer peripheral edge 11a of the outer steel plate 11A and one inner steel plate 11B adjacent to the outer steel plate 11A is bent, the split core by the fastening ring 3 is compared with the first embodiment. The rigidity against compressive stress of 2 is further increased. In this sense, deformations such as buckling, turning up, and floating can be suppressed more strongly than in the first embodiment with respect to the plurality of stacked steel plates 11A and 11B constituting each divided core 2.

<Third Embodiment>
Next, a third embodiment in which the stator core of the present invention is embodied will be described in detail with reference to the drawings.

  FIG. 6 shows a split core 2 of this embodiment in a cross-sectional view similar to FIG. This embodiment is different from the first and second embodiments in that all the outer peripheral edges 11a of all the steel plates 11A and 11B constituting each divided core 2 are bent in the same direction.

  Therefore, in this embodiment, since all the outer peripheral edges 11a of all the steel plates 11A and 11B are bent in the same direction, the compression of the split core 2 by the fastening ring 3 as compared with the first and second embodiments. The rigidity against stress is further increased. In this sense, deformations such as buckling, turning, and floating can be suppressed more strongly than the first and second embodiments with respect to the plurality of stacked steel plates 11A and 11B constituting the individual divided cores 2. .

<Fourth embodiment>
Next, a fourth embodiment in which the stator core of the present invention is embodied will be described in detail with reference to the drawings.

  FIG. 7 shows a stator core 1 of this embodiment in a plan view similar to FIG. This embodiment is different in configuration from the first embodiment in which all the outer peripheral edges 11a are bent for each divided core 2 in that only both corners 11b of the outer peripheral edge of the outer steel plate 11A are bent.

  Therefore, in this embodiment, since only the corners 11b of the outer peripheral edge of the outer steel plate 11A are bent, the rigidity against the compressive stress of the split core 2 by the fastening ring 3 is increased, and the processing of the outer steel plate 11A is performed first. It is easier compared to the case of form. In this sense, deformations such as buckling, turning, and floating can be suppressed with respect to the plurality of stacked steel plates 11A and 11B that constitute each divided core 2. In addition, the split core 2 can be easily manufactured by the amount that the outer steel plate 11A can be easily processed.

  The present invention is not limited to the above-described embodiments, and can be implemented as follows by appropriately changing a part of the configuration without departing from the spirit of the invention.

  (1) In the two embodiments, all the outer peripheral edges 11a of the two steel plates 11A and 11B near the outside are bent, but only both corners of the outer peripheral edges may be bent. In this case, it is possible to easily manufacture the split core as much as the processing of the steel plate is easy.

  (2) In the three embodiments, all the outer peripheral edges 11a of all the steel plates 11A and 11B constituting the split core 2 are bent in the same direction, but only both corners of the outer peripheral edges of all the steel plates are bent. Also good. In this case, the split core can be easily manufactured by the amount that the steel plate can be easily processed.

  The present invention can be applied to a stator of a motor.

1 Stator core 2 Split core 3 Fastening ring (fastening means)
5 Abutting surface 11a All of outer peripheral edge 11b Corner 11A of outer peripheral edge Outer steel plate 11B Inner steel plate

Claims (5)

In the stator core in which a plurality of divided cores configured by laminating a plurality of steel plates are arranged adjacent to each other on the circumference, and the plurality of divided cores are compressed and integrally fastened by fastening means mounted on the outer periphery. ,
A stator core, wherein an outer steel plate located on the outermost side among the plurality of steel plates constituting each of the split cores is plastically deformed including a surface in contact with an adjacent split core.   2. The stator core according to claim 1, wherein an outer peripheral edge of the outer steel plate is bent at each of the divided cores.   2. The stator core according to claim 1, wherein for each of the divided cores, only both corners of the outer peripheral edge of the outer steel plate are bent.   2. The stator core according to claim 1, wherein, for each of the divided cores, the entire outer peripheral edge of the outer steel plate located on the outermost side and at least one inner steel plate adjacent to the outer steel plate is bent.   2. The stator core according to claim 1, wherein, for each of the divided cores, only both corners of the outer peripheral edge of the outer steel plate located on the outermost side and at least one inner steel plate adjacent to the outer steel plate are bent. .

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