JP2011078260A - Hollow body and motor equipped with hollow body - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a stator core containing holes which interconnect the inside and the outside. <P>SOLUTION: In the stator core 30 having a plurality of substantially annular core plates 10 laminated in the axial direction 101, each of the plurality of core plates 10 includes: a first notch 21 formed by partially cutting out the inner circumferential edge 11 side of the core plate 10; a second notch 22 formed by partially cutting out the outer circumferential edge 12 side of the core plate 10; and at least one opening 23 which penetrates the core plate 10. A hole 50 interconnecting the inside 55 and the outside 56 is formed in the stator core 30 by the first notch 21 of the laminated core plates 10, the opening 23, and the second notch 22. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a hollow body having a portion in which plates are laminated and a motor having the same.

  In patent document 1, when forming the stator of a motor with a laminated steel plate, each steel plate is provided with a long hole that serves as a refrigerant passage so as to extend in the circumferential direction along the outer edge of each steel plate, and from the inflow pipe to the shunt pipe. It is described that the refrigerant is caused to flow through each of the long holes and flows out from the outflow pipe.

JP 7-298524 A

  The technique disclosed in Patent Document 1 is intended to cool the inside of a rotating electrical machine, but a long hole serving as a passage for a refrigerant to be cooled is provided on the outside of each steel plate constituting the stator. From cooling. On the other hand, in paragraph No. 0003 of Patent Document 1, a heat exchanger separate from the stator is interposed between the stator and the outer wall of the rotating electrical machine, for example, according to Japanese Utility Model Laid-Open No. 58-159872, and within the rotating electrical machine. It is described that what is known to suppress the rise in the internal temperature by cooling the circulating air with the heat exchanger.

  However, in a hollow body such as a stator that is cylindrical and has a hollow inside for installing the rotor, a configuration that communicates the inside and the outside of the stator in the radial direction is not disclosed. In particular, in the annular steel plate constituting the stator, there is no disclosure of a configuration in which the inside and the outside communicate with each other without cutting the circumferential magnetic circuit.

  One embodiment of the present invention is a hollow body having a stacked structure portion in which a plurality of annular plates are stacked in the axial direction. Each annular plate includes a first notch part in which a part on the inner peripheral side of the annular plate is cut out, a second notch part in which a part on the outer peripheral side of the annular plate is cut out, and an annular plate. And at least one opening therethrough. The stacked structure portion includes a plurality of different layers that are rotated around the axis and stacked such that the first notch, the second notch, and the at least one opening are arranged differently around the axis. An inner and outer sides of the hollow body via the first notch, the at least one opening, and the second notch of the plurality of annular plates of different phase arrangement, including an annular plate of phase arrangement The communication hole which connects is formed.

  The annular plate includes a first notch, a second notch, and at least one opening. The annular plate itself is connected in an annular shape, and the annular plate is connected from the inner peripheral side to the outer peripheral side. Not cut or split radially. Therefore, the rigidity as the annular plate is high, and furthermore, when this annular plate is used as a component constituting a magnetic circuit such as a stator core, the circumferential magnetic circuit is not cut.

  On the other hand, when the plurality of annular plates are stacked by rotating around the axis such that the first notch, the second notch, and the at least one opening are arranged differently around the axis, The one notch, the second notch, and the at least one opening are arranged at different phases (angles), and at least one of the first notches of the plurality of annular plates with different phase arrangements. A communication hole is formed through which the inside and the outside of the hollow body communicate with each other through the two openings and the second notch. Accordingly, in the hollow body having a hollow inside, the inside and the outside of the hollow body can be communicated in the radial direction. In particular, in the case where the hollow body constitutes a magnetic circuit such as a stator, the annular plate can communicate the inside and the outside of the hollow body without cutting the circumferential magnetic circuit.

  Furthermore, the communication hole formed in the hollow body has a first notch portion and a second notch portion that are different in position in the axial direction and different in distance from the shaft in the radial direction, and further, at least one opening. It becomes the thing which connected the part. Therefore, the communication hole is not a straight hole but includes an appropriate step, and the shape of the step can be controlled as will be described later. For this reason, it is possible to prevent foreign matter from entering the inside of the hollow body through the communication hole, increase the contact area between the fluid passing through the communication hole and the annular plate, or particles contained in the fluid passing through the communication hole. Alternatively, the communication hole can be provided with another function that promotes separation of liquid and gas.

  The respective openings of the first notch, the second notch, and the at least one opening are preferably arranged at n-fold symmetrical positions around the axis of the annular plate. However, n is an integer of 3 or more. By arranging each of the first notch, the second notch, and the at least one opening in a rotationally symmetric position, the plurality of communication holes are placed in a rotationally symmetric place of the hollow body. Can be provided. Further, typically, the communication hole can be formed by laminating one kind of annular plate in a rotationally symmetric state.

  In particular, an annular plate forming a hollow body having a rotationally symmetric structure such as a stator is often rotationally symmetric. Therefore, it is easy to additionally provide a first notch, a second notch, and at least one opening on an annular plate whose basic structure is rotationally symmetric.

  The laminated structure includes a plurality of in-phase annular plates, wherein the first cutout, the second cutout, and the at least one opening are stacked so that the arrangement is the same around the axis. It is also effective. It is desirable that the plate groups composed of the plurality of annular plates having the same phase arrangement are stacked so as to have different phases. By laminating a plurality of annular plates in the same phase, the cross-sectional area of the communication hole that communicates the outside and the inside of the hollow body can be enlarged. Therefore, by controlling the number of annular plates stacked in the same phase, the cross-sectional area of the communication hole that communicates the outside and the inside of the hollow body can be easily controlled.

  The first portion of the annular plate in which the first notch portion is formed, the second portion in which the second notch portion is formed, and the portion in which the respective opening portions of at least one opening portion are formed are Desirably, it is wider than the other part of the annular plate. It can suppress that the rigidity of these parts falls or a magnetic flux density falls.

  The at least one opening partly overlaps the first notch at an angle when the adjacent annular plates are rotated about the axis, and is at least one with respect to the second notch at a different angle. The opening part may overlap. The at least one opening has a second angle at a different angle from the first opening that partially overlaps the first notch at an angle when the adjacent annular plates are rotated about the axis. The second opening may partially include the second opening that partially overlaps the notch, and further includes the second opening that partially overlaps the first opening at a different angle. Furthermore, the at least one opening has a different angle from the first opening that partially overlaps the first notch at an angle when the adjacent annular plates are rotated about the axis. A second opening that partially overlaps the two notches, and a third opening that partially overlaps the outer opening and the inner opening at different angles. Good. Further, when the adjacent annular plates are rotated around the axis, a part of the first notch part and a part of the second notch part may overlap at a certain angle.

  That is, another aspect of the present invention is a hollow body having a laminated structure portion in which a plurality of annular plates are laminated in the axial direction, and each annular plate is cut out at a part on the inner peripheral edge side of the annular plate. A first cutout portion and a second cutout portion in which a part on the outer peripheral edge side of the annular plate is cut out, and the laminated structure portion includes a first cutout portion and a second cutout portion. A plurality of out-of-phase arrangement of annular plates, wherein the plurality of out-of-phase arrangement of annular plates are stacked in a different arrangement about the axis; It is a hollow body in which a communication hole that communicates the inside and the outside of the hollow body through at least the second notch is formed.

  One aspect of the hollow body is a stator core of a motor, and the annular plate is a ferromagnetic body. The hollow body may further be a stator including a stator coil wound around the stator core. If the hollow body is a stator having a number m of slots, it is desirable that the first notch and the second notch of the annular plate are arranged at (C × m) times symmetrical positions. However, m is an integer of 1 or more, C is an integer of 1 or more, and C × m is 3 or more. The annular plate constituting the stator having the number of slots of m has a rotationally symmetric shape, and the first notch and the second notch are arranged in the (C × m) times symmetrical position to be the same. By manufacturing the stator while rotating the shaped annular plate, the communication holes can be introduced into the stator from the inside to the outside.

  Another aspect of the present invention is a motor having the stator described above. A communication hole that communicates the stator in the radial direction can communicate the inside of the motor with the outside world, and a path to access the inside of the motor for ventilation or cooling can be secured.

  Such a configuration for communicating the inside and the outside of the hollow body is not limited to the stator as long as the hollow body has a structure in which the annular plates are stacked, and can be applied to other parts of the motor. For example, when the structure which laminates | stacks an annular plate on an outer rotor is employ | adopted, it can apply also to an outer rotor. Furthermore, it is applicable not only to motors but also to other uses, including a hollow filter that separates particles of an appropriate size, etc., and a catalyst body such as an exhaust gas removal device that needs to ensure a contact area with the catalyst body Examples thereof include a device, a nozzle that disperses and inputs fluid, and a vibration isolation device in which an annular elastic body is laminated. The annular plate is not limited to an annular ring plate, but may be a polygonal ring.

  Another aspect of the present invention is an annular plate that forms a hollow laminated structure by being laminated in the axial direction. The annular plate includes a first cutout part in which a part of the inner peripheral side of the annular plate is cut out, a second cutout part in which a part of the outer peripheral side of the annular plate is cut out, and the annular plate A plurality of annular plates, wherein the first notch, the second notch, and the at least one opening are arranged differently around the axis. The first notch, the at least one opening, and the second notch of the annular plate laminated at different phases included in the plurality of annular plates when rotated and stacked around the axis A communication hole is formed to communicate the inner side and the outer side of the laminated structure via the.

  One of other different embodiments of the present invention is a method of manufacturing a hollow body including a laminated structure portion in which a plurality of annular plates are laminated in the axial direction. Each annular plate includes a first notch part in which a part on the inner peripheral side of the annular plate is cut out, a second notch part in which a part on the outer peripheral side of the annular plate is cut out, and an annular plate. And at least one opening therethrough. The method includes locating at least a portion of the plurality of annular plates around the axis such that the first notch, the second notch, and the at least one opening are arranged differently around the axis. Rotating and laminating to form a communication hole that communicates the inside and the outside of the hollow body via the first notch, at least one opening, and the second notch of the annular plates that are arranged differently. Process.

The perspective view which shows the outline | summary of the motor provided with the communicating hole. The front view which looked at the motor shown in FIG. 1 from the front side. The side view of the motor shown in FIG. IV-IV sectional drawing of the motor shown in FIG. 1 (IV-IV cross section of FIG. 2). The figure which extracted the stator core of the motor and expand | deployed to the axial direction. The top view of the core plate which comprises a stator core. Sectional drawing which shows the laminated structure of a stator core. The figure which shows the experimental result about the raise temperature inside a motor. Sectional drawing which shows the structure from which a stator core differs. Sectional drawing which shows the further different structure of a stator core. Sectional drawing which shows the further different structure of a stator core.

  FIG. 1 is a perspective view showing the appearance of a motor 1 having a stator core 30 according to the present invention. FIG. 2 shows the motor 1 as viewed from the front side 1a. FIG. 3 shows the motor 1 as viewed from the side. FIG. 4 shows a schematic configuration of the motor 1 in the IV-IV cross section of FIG.

  This motor (electric motor) 1 is an inner rotor type motor, and the inside 55 is hollow and arranged in a hollow cylindrical stator (stator) 5 and inside (inside) 55 of the stator 5. It has a rotor (rotor) 6 and a shaft 4 that supports the rotor 6 and rotates by the rotor 6. The motor 1 further includes a front cover 2 disposed in front of the stator 5, a rear cover 3 disposed behind the stator 5, and the front cover 2, the rear cover 3, and the stator 5 in combination (integrated). A bolt 7 for constituting one casing 9 is included. The shaft 4 is rotatably supported through the bearings 8 at the central portions of the front cover 2 and the rear cover 3.

  The stator 5 of the motor 1 is a stator of the motor 1 and is a substantially cylindrical hollow body in which the inner 55 is hollow so that the inner rotor 6 is disposed on the inner side 55. Similarly, the stator 5 includes a stator core (stator core) 30 which is a substantially cylindrical hollow body having a hollow inside 55, and a stator coil (stator winding) wound around the inside 55 of the stator core 30. 35). The stator core 30 is a laminated structure (laminated structure portion) 39 constituted by a plurality of thin, substantially annular core plates (annular plates) 10 laminated in the axial direction 101. The front side 1 a is supported by the front cover 2, and the rear side 1 b is supported by the rear cover 3. The core plate 10 of this example is a flat disk-shaped ring plate having a thickness of about 0.2 to 0.5 mm, and a portion of the laminated structure 39 in which a plurality of core plates 10 are laminated is shown in each figure as a laminated layer. Some of the states are omitted.

  The core plate 10 is a steel plate having a high conversion efficiency between electric energy and magnetic energy, and is made of an electromagnetic steel plate that is a ferromagnetic material such as a silicon steel plate and has a high magnetic permeability. Further, each of the annular core plates 10 includes a first cutout portion 21 in which a part on the inner peripheral edge 11 side of the core plate 10 is cut out, and a part on the outer peripheral edge 12 side of the core plate 10. The second notch portion 22 that is lacking and the opening 23 that penetrates the core plate 10 are included. Then, the laminated structure 39 of the stator 5 is rotated around the shaft 100 so that the first cutout portion 21, the second cutout portion 22, and the opening portion 23 are arranged differently around the shaft 100. A plurality of annular plates 111, 112, and 113 having different phase arrangements, the first cutout portion 21, the opening 23, and the first of the plurality of annular plates 111, 112, and 113 having different phase arrangements. A communication hole 50 is formed to communicate the inner side 55 and the outer side 56 of the stator 5, which is a hollow body, via the two notches 22.

  Thus, the stator 5 of the motor 1 penetrates the stator 5 that is a hollow body in the radial direction, and a plurality of holes (communication holes) 50 that communicate the interior 55 and the exterior 56 of the stator 5 are circumferential and axial directions. Are distributed. The front cover 2 has six through-holes 2c penetrating the lid portion 2a in the axial direction 101, and is arranged on the concentric circle about the shaft 100 at substantially equal intervals. Therefore, the casing 9 of the motor 1 is configured as a whole closed by the stator 5 that constitutes the peripheral wall, the front cover 2 that constitutes the front end wall, and the rear cover 3 that constitutes the rear end wall. The interior 55 of the casing 9 can be ventilated by the hole 50 penetrating through 5 and the through hole 2c penetrating through the front cover 2.

  For example, when air in the inside 55 of the casing 9 is released from the communication hole 50 provided in the circumferential direction by centrifugal force due to the rotation of the rotor 6, outside air is passed through the through hole 2 c that penetrates the front cover 2. Sucked into. Therefore, heat generated in the inside 55 of the casing 9 can be released to the outside 56 by such an air flow, and further, the stator 5 can be cooled by the air passing through the communication hole 50 of the stator 5. For this reason, the performance fall of the motor 1 by the temperature rise of the inside of the casing 9 or the stator 5 can be suppressed.

  As shown in FIGS. 3 and 4, more specifically, the stator core 30 has 68 core plates 10 stacked in the axial direction 101. The stator core 30 employs a laminated structure 39 in which twelve adjacent core plates 10 form a set of core units 30a and constitute three communication holes 50 in the circumferential direction. Therefore, the stator 5 includes five sets of core units 30a, and 15 communication holes 50 penetrating in the radial direction are arranged in the stator 5 in a distributed manner.

  FIG. 5 shows a state where the stator core 30 is extracted and expanded in the axial direction 101. FIG. 6 shows a state in which one core plate 10 is extracted from the stator core 30 and viewed from the front side 1a. In FIG. 7, the laminated structure 39 of the stator core 30 is shown partially enlarged.

  The plurality of core plates 10 constituting the stator 5 have the same shape. As shown in FIG. 6, the core plate 10 has a substantially circular outer peripheral edge 12 as a whole, and the inner peripheral edge 11 side is hollow. It is a flat annular plate. The core plate 10 is formed by notching a part on the inner peripheral edge 11 side of the core plate 10 and notching a part on the outer peripheral edge 12 side of the core plate 10. The second notch 22 formed and the opening 23 formed so as to penetrate the core plate 10 in the direction of the axis 100. The first cutout portion 21, the second cutout portion 22 and the opening portion 23 formed in the core plate 10 are positioned symmetrically around the axis 100 of the core plate 10 three times counterclockwise in FIG. Are arranged in order. That is, the first notch part 21, the second notch part 22, and the opening part 23 are arranged at rotationally symmetric positions with an angle of 120 degrees around the axis 100.

  The first cutout portion 21 is formed by cutting the inner peripheral edge 11 side of the core plate 10 into a square shape, and is an opening portion opened toward the inner side 55. The second notch 22 is formed by cutting the outer peripheral edge 12 side of the core plate 10 into a square shape, and is an opening that is open toward the outer side 56. The opening 23 is a rectangular opening penetrating substantially the center of the plate portion 10 a of the core plate 10 in the thickness direction of the core plate 10, and is not connected to either the inner side 55 or the outer side 56.

  The depth (radial length) d21 of the first notch 21, the depth d22 of the second notch 22, and the depth d23 of the opening 23 are each 2/5 of the depth d10 of the plate portion 10a. The width (circumferential length) W21 of the first notch 21, the width W22 of the second notch 22, and the width W23 of the opening 23 are substantially the same. Therefore, this core plate 10 rotates, for example, one core plate 10, for example, the upper core plate 10 clockwise by 120 degrees (three-fold symmetrical rotation angle) when, for example, two core plates 10 are arranged in an overlapping manner. Then, a part of the inner peripheral side 11 of the opening 23 partially overlaps the first notch part 21 of the adjacent (lower) core plate 10. Further, when one core plate 10 is rotated 120 degrees in the clockwise direction, a part of the outer peripheral side 12 of the opening 23 becomes one with respect to the second notch 22 of the adjacent (lower) core plate 10. The parts overlap. However, even if the two core plates 10 are overlapped and rotated, a part of the first notch 21 of the upper core plate 10 and a part of the second notch 22 of the lower core plate 10 are Do not overlap.

  For this reason, when manufacturing the laminated structure portion 39 of the stator 5, the plurality of core plates 10 are different in the first notch portion 21, the second notch portion 22, and the opening portion 23 around the shaft 100. The stator 5 is rotated via the first notch 21, the opening 23, and the second notch 22 of the core plate 10 in different arrangements by rotating around the shaft 100 so as to be arranged. The communication hole 50 which connects the inner side 55 and the outer side 56 can be formed. That is, the three cores having different phase arrangements in which the phases are changed by 120 degrees so that the first notch part 21, the second notch part 22, and the opening part 23 are arranged differently around the axis 100. A communication hole 50 that communicates the inner side 55 and the outer side 56 of the stator 5 can be formed via the first notch part 21, the opening part 23, and the second notch part 22 of the different core plates 10 of the plate 10. . Alternatively, three sets (three groups) of different phase arrangement plate groups including a plurality of core plates 10 having the same phase arrangement, each of the first notch portion 21, the opening portion 23, and the second portion of the plate group different from each other. A communication hole 50 that allows communication between the inner side 55 and the outer side 56 of the stator 5 can be formed via the notch 22.

  Further, the motor 1 has three slots (slot number m is 3), and the core plate 10 has three portions on the inner peripheral side 11 in the direction of the axis 100, that is, a portion 36 protruding toward the inner side 55. Including. The protruding portion 36 constitutes three teeth (saliency pole portions) of the stator core 30 having three slots by laminating the plurality of core plates 10, and the concave portions 38 on both sides of the protruding portion 36 are It becomes a slot in which the stator coil 35 is wound. The three protruding portions 36 constituting the three teeth are arranged at three-fold symmetry with respect to the axis 100, that is, at rotationally symmetrical positions separated by an angle of 120 degrees. Therefore, the core plate 10 has a three-fold inner shape for constituting the stator core 30. When the core plate 10 is rotated by 120 degrees, the inner shapes coincide with each other, and the core plates 10 arranged in different phases by 120 degrees are completely overlapped. Can do.

  For this reason, stacking the plurality of core plates 10 with a phase difference of 120 degrees does not hinder the production of the stator core 30, and the first is achieved by stacking the core plates 10 with a phase shift of 120 degrees. The communication hole 50 can be formed through the notch 21, the second notch 22, and the opening 23. Furthermore, by laminating a plurality of core plates 10 with a phase difference of 120 degrees, even if there are individual differences in the range of tolerances in dimensions such as thickness on the core plate 10, the individual differences are dispersed. As a whole, the stator core 30 and the stator 5 with higher accuracy can be manufactured.

  Further, the core plate 10 is provided with three slits 37 in which a part of the outer peripheral side 12 is recessed toward the shaft 100 side (inner side). By laminating the plurality of core plates 10, these slits 37 are used to stabilize the laminated structure 39 through the bolts 7 and to integrate the stator 5 with the front cover 2 and the rear cover 3. These three slits 37 are also provided at positions that are three times symmetrical with respect to the axis 100, that is, at an angle of 120 degrees. Therefore, also in this respect, the core plate 10 can be laminated with a phase shift of 120 degrees.

  Further, the core plate 10 includes a plate portion (first portion) 10a in which the first notch portion 21 is formed, a plate portion (second portion) 10a in which the second notch portion 22 is formed, and The depth (width, length in the radial direction) d10 of the plate portion 10a in which the opening 23 is formed is wider than the depth dm of the neck portion 10b of the protruding portion 36 of the core plate 10. Specifically, the depth d10 of the plate portion 10a is set such that the depth d21 of the first cutout portion 21, the depth d22 of the second cutout portion 22 or the depth d23 of the opening portion 23 is equal to the depth dm of the neck portion 10b. Same or larger than the added dimension. Therefore, the first notch 21, the second notch 22 and the opening 23 in the portion where the first notch 21, the second notch 22 and the opening 23 of the core plate 10 are formed. The cross-sectional area of the portion that functions as a magnetic body excluding the above is designed to be the same as or larger than the cross-sectional area of the neck portion 10b.

  For this reason, in the core plate 10, the first cutout portion 21, the second cutout portion 22 and the opening 23 are formed, but since the plate is continuous in an annular shape, a magnetic path is secured, Magnetic flux is not interrupted. Further, the strength as the annular structure does not decrease. Furthermore, the cross-sectional area of the plate portion 10 a in which the first notch portion 21, the second notch portion 22, and the opening 23 of the core plate 10 are formed is likely to be the smallest cross-sectional area of the core plate 10. It is the same as or larger than the cross-sectional area of the portion 10b. For this reason, the magnetic flux density is reduced or the magnetic flux is saturated in the plate portion 10a in which the first cutout portion 21, the second cutout portion 22 and the opening 23 of the core plate 10 are formed. Absent. Further, the mechanical strength of the plate portion 10a in which the first cutout portion 21, the second cutout portion 22 and the opening 23 of the core plate 10 are formed does not decrease. In addition, since the slit 37 of the core plate 10 is also provided outside the three protruding portions 36, the cross-sectional area of the slit 37 portion can be sufficiently secured, and the magnetic flux density is reduced or the strength is reduced. It is supposed not to.

  For this reason, the communication hole 50 which connects the interior 55 and the exterior 56 can be formed by preventing the flow of magnetic flux or reducing the strength by laminating a plurality of core plates 10 with different phases. Therefore, it is possible to prevent a situation in which the magnetic field strength of the stator 5 is reduced and the torque of the motor 1 is reduced. Conversely, the ability to ventilate through the communication hole 50 can improve the cooling efficiency inside the motor 1 and can improve the cooling efficiency of the stator 5. For this reason, the fall of the performance of the motor 1 by a temperature rise can be suppressed.

  In FIG. 7, the cross section of the part in which the communication hole 50 which connects the inner side 55 and the outer side 56 of the stator core 30 was formed is expanded and shown. This stator core 30 is formed by laminating plate groups 111, 112, and 113 in which four core plates 10 having the same phase are stacked with phases different by 120 degrees, and a communication hole 50 is configured by a total of 12 core plates 10. Yes. As described above, the first notch portion 21, the second notch portion 22, and the opening portion 23 are included, the plate itself is connected in an annular shape, and the plate itself is connected from the inner peripheral edge 11 side to the outer peripheral edge 12. By laminating the core plate 10 that is not cut or divided in the radial direction toward the side, a communication hole 50 that communicates the inside 55 and the outside 56 can be formed. Therefore, it has a communication hole 50 that communicates the inside 55 and the outside 56, and has high rigidity even at the stage of the smallest component part of the core plate 10, and is hollow by stacking parts whose circumferential magnetic circuit is not cut. The stator core 30 and the stator 5 which are bodies can be manufactured.

  Further, the communication hole 50 formed in the stator core 30 has a first notch portion 21, an opening portion 23, and a second notch portion having different positions in the direction of the shaft 100 and different distances from the shaft 100 in the radial direction. The notch 22 is connected. Therefore, the communication hole 50 is not a straight hole but includes an appropriate step 58 depending on the thickness of the core plate 10 inside the hole. Furthermore, the shape of the step 58 can be controlled by controlling the number of core plates 10 stacked in phase. For this reason, it is possible to prevent foreign matter from entering the inside 55 of the stator 5 through the communication hole 50, that is, the inside 55 of the motor 1, or contact between the air passing through the communication hole 50 and the stator 5 and the stator core 30. It becomes possible to give the communication hole 50 a function of increasing the area and promoting the cooling efficiency.

  Further, the first notch 21, the second notch 22, and the opening 23 can be arranged in the core plate 10 at a three-fold symmetrical position around the axis 100, and the three-slot stator 5 is symmetrical. It is possible to adapt to sex. Therefore, by laminating one type of core plate 10 while shifting the phase, a form as the rotationally symmetric stator 5 can be realized, and at the same time, the communication hole 50 can be formed. Although it is possible to prepare a plurality of types, for example, three types of core plates 10, it is economically advantageous to manufacture the stator 5 by laminating one type of core plates 10 while shifting the phases. Furthermore, there is also an advantage that a more accurate stator 5 can be manufactured by dispersing the tolerances of the individual core plates 10.

  In addition, since the laminated structure portion 39 constituting the stator 5 and the stator core 30 can form the communication holes 50 only by arranging the core plate 10 out of phase, it is possible to communicate in various shapes depending on how the core plates 10 are laminated. The hole 50 can be formed, and further, the communication hole 50 can be prevented from being formed. For example, all the core plates 10 of the laminated structure 39 are arranged in the same phase, or the phases are changed so that the first notch 21, the second notch 22, and the opening 23 do not communicate with each other. By doing so, the stator 5 which does not have the communicating hole 50 can be provided.

  In the example shown in FIG. 7, four core plates 10 having a thickness of about 0.2 to 0.5 mm or less are stacked in the same phase, and plate groups 111, 112, and 113 having the same phase arrangement are arranged in different phases. By arranging, the size W1 in the axial direction 101 of the communication hole 50 and the size W2 in the radial direction of the communication part 50a of the first notch 21 and the opening 23 are made to be approximately the same. Thereby, the communication hole 50 with the substantially same opening cross section from the inner side 55 to the outer side 56 can be manufactured. Moreover, even if the surface of the stator core 30 is coated after the core plate 10 is laminated and the stator core 30 is manufactured, it is possible to suppress the communication hole 50 from being blocked.

  By increasing the number of core plates 10 having the same phase arrangement, it is possible to form a communication hole 50 having a larger axial size W1. Conversely, by reducing the number of core plates 10 in the same phase arrangement, it is possible to form the communication holes 50 having a small size W1 in the axial direction. For example, it is possible to stack the core plates 10 all out of phase, and the stator 5 is provided with a large number of communication holes 50 around the core plate 10 having a small thickness level and less likely to infiltrate foreign matter. It is also possible to do. Thus, by controlling the number of core plates 10 laminated in the same phase, the cross-sectional area of the hole 50 that communicates the outer side 56 and the inner side 55 of the stator core 30 that is a hollow body can be easily controlled. Therefore, the number, size, and inclination angle of the communication holes 50 in which the stator core 30 is formed can be freely controlled.

  Further, in the motor 1 using the stator core 30 provided with the communication holes 50 by the core plate 10 and the stator 5, a large number of communication holes 50 distributed around the casing 9 of the motor 1 in three directions are provided. Heat generated in the interior 55 of the casing 9 can be released, and the stator 5 can also be cooled.

  FIG. 8 shows an experimental result regarding the rising temperature of the inside 55 of the motor 1 including the stator 5. A temperature rise with respect to the operation time of the motor 1 having the communication hole 50 is indicated by a solid line 81, and a temperature rise of a motor not having the communication hole 50 is indicated by a broken line 82 as a comparative example. The ambient temperature during the measurement was 27 ° C., the rotation speed of the motor 1 was set to 37 krpm, and the current value was set to 4.8 A. As can be seen from this figure, when the operation time exceeds 600 seconds (10 minutes), the internal temperature of the motor of the comparative example exceeds 70 ° C., whereas in the motor 1 in which the communication hole 50 is provided in the stator 5. The internal temperature rise is suppressed to about 65 ° C. Therefore, by providing the communication hole 50 in the stator 5, the temperature increase of the motor 1 can be suppressed, and the performance degradation due to the temperature increase of the motor 1 can be suppressed.

  The core plate 10 is provided with the first notch 21, the second notch 22, and the opening 23 at a three-fold symmetrical position, and these notches and openings are defined as n. It can be provided at a rotationally symmetric position. However, n is an integer of 3 or more. Furthermore, if the stator 5 is the stator 5 with the number of slots m, the stator 5 has a m-symmetric shape. For this reason, the core plate 10 is also provided with a m-fold symmetrical shape as the shape related to the stator 5, and accordingly, the notch and the opening are arranged at a (C × m) -fold symmetrical position. It is desirable that However, m is an integer of 1 or more, C is an integer of 1 or more, and (C × m) is 3 or more. When the core plate 10 is arranged at a rotationally symmetric position so as to constitute the stator 5 and the stator core 30 having the number of slots m, a notch portion and an opening arranged at a (C × m) -fold symmetric position A part overlaps and the communicating hole 50 is formed.

  In FIG. 9, different examples of the core plate 120 including the first notch portion 21, the second notch portion 22, the first opening portion 24, and the second opening portion 25 are stacked. The laminated structure portion 39 in which the communication holes 50 are formed is shown in cross section. In the core plate 120, the first cutout portion 21, the second cutout portion 22, the first opening portion 24, and the second opening portion 25 are arranged at four-fold symmetrical positions. . That is, the core plate 120 has a first cutout portion 21, a second cutout portion 22, a first opening portion 24, and a second opening portion 25 with a 90-degree pitch around the axis 100. The plate groups 121, 122, 123, and 124 in which three in-phase core plates 120 are stacked are stacked at a phase different by 90 degrees, and the stator core 30 is formed by a total of 12 core plates 120. The communication hole 50 which connects the inner side 55 and the outer side 56 can be formed.

  The core plate 120 is provided when the adjacent annular core plates 120 are rotated around the axis 100 as openings in addition to the first notch portion 21 and the second notch portion 22. The first opening 24 that partially overlaps the first notch 21 at an angle, 90 degrees in this example, and a portion that overlaps the second notch at a different angle, 270 degrees in this example Second opening 25. The second opening 25 partially overlaps the first opening 24 at a different angle, in this example, 180 degrees. Therefore, via the first notch 21, the first opening 24, the second opening 25, and the second notch 22 of the core plate 120 arranged at a phase different by 90 degrees. The communication hole 50 that communicates the inner side 55 and the outer side 56 can be formed. Also in the laminated structure portion 39 using the core plate 120, the size and inclination of the communication hole 50, the number of the laminated structure portion 39, and the like can be freely controlled by the number of laminated core plates 120 having the same phase.

  In the core plate 120, the first notch portion 21, the first opening portion 24, the second opening portion 25, and the second notch portion 22 are arranged at four-fold symmetrical positions. Therefore, it is suitable for constituting the stator 5 of the motor having two or four slots. Further, since the communication hole 50 is configured by connecting four spaces of the first notch 21, the first opening 24, the second opening 25, and the second notch 22. The cross-sectional defect of the plate portion of the core plate 120 can be further reduced. Accordingly, it is possible to provide a core plate 120 that can easily maintain the magnetic flux density and has high strength.

  FIG. 10 further includes a first notch portion 21, a second notch portion 22, a first opening portion 24, a second opening portion 25, and a third opening portion 26. The laminated structure part 39 in which the core plate 130 of the example is laminated and the communication hole 50 is formed is shown by a cross section. In the core plate 130, the first notch 21, the second notch 22, the first opening 24, the second opening 25, and the third opening 26 are performed five times. It is arranged in a symmetrical position. That is, the core plate 130 includes a first cutout portion 21, a second cutout portion 22, a first opening portion 24, a second opening portion 25, and a third opening portion 26. Plate groups 131, 132, 133, 134, and 135, which are arranged around the axis 100 at a 72-degree pitch and on which three in-phase core plates 130 are stacked, are stacked at a phase different by 72 degrees, for a total of 15 A communication hole 50 that allows communication between the inner side 55 and the outer side 56 of the stator core 30 can be formed by the single core plate 130.

  In addition to the first cutout portion 21 and the second cutout portion 22, the core plate 130 has an opening, and when the adjacent annular core plates 130 are rotated around the axis 100, the core plate 130 has 5 A first opening 24 that partially overlaps the first notch 21 at an angle that is rotationally symmetric, and a second that partially overlaps the second notch 22 at a different angle that is five-fold symmetric. And an opening 25. The core plate 130 further includes a second opening 25 on the outer peripheral side and a third opening 26 that partially overlaps the first opening 24 on the inner peripheral side at different angles that are five times symmetrical. Yes. Therefore, the first notch 21, the first opening 24, the third opening 26, the second opening 25, the second opening of the core plate 130 arranged at a phase different by 72 degrees, A communication hole 50 that allows communication between the inner side 55 and the outer side 56 can be formed via the notch 22. Also in the laminated structure portion 39 using the core plate 130, the size and inclination of the communication holes 50 and the number of the communication holes 50 formed in the laminated structure portion 39 can be freely set according to the number of laminated core plates 130 in the same phase. Can be controlled.

  Further, the core plate 130 includes a first cutout portion 21, a first opening portion 24, a third opening portion 26, a second opening portion 25, and a second cutout portion 22. Since it is arranged at a 5-fold symmetrical position, it is suitable for constituting the stator 5 of the motor having five slots. In addition, the communication hole 50 is made up of five of the first notch 21, the first opening 24, the third opening 26, the second opening 25, and the second notch 22. Since the two spaces are connected, the cross-sectional defect of the plate portion of the core plate 130 can be further reduced. Accordingly, it is possible to provide a core plate 130 that is easy to maintain the magnetic flux density and has high strength.

  FIG. 11 is a cross-sectional view showing a laminated structure portion 39 in which a core plate 140 of another example including the first notch portion 21 and the second notch portion 22 is laminated and the communication hole 50 is formed. ing. In the core plate 140, the first notch portion 21 and the second notch portion 22 are arranged at a four-fold symmetrical position. That is, in the core plate 140, the first notch portions 21 and the second notch portions 22 are alternately arranged around the shaft 100 at a 90-degree pitch, and four core plates having the same phase are arranged. Plate groups 141 and 142 on which 140 are stacked are stacked at a phase different by 90 degrees, and a total of eight core plates 140 can form a hole 50 that connects the inner side 55 and the outer side 56 of the stator core 30.

  The core plate 140 includes a first cutout portion 21 and a second cutout portion 22 that partially overlap each other when adjacent annular core plates 140 are rotated around the axis 100. Therefore, the hole 50 which connects the inner side 55 and the outer side 56 can be formed through the first notch part 21 and the second notch part 22 of the core plate 140 arranged at a phase different by 90 degrees. Also in the laminated structure portion 39 using the core plate 140, the size and inclination of the communication holes 50 and the number of the communication holes 50 formed in the laminated structure portion 39 can be freely set according to the number of the laminated core plates 140 in the same phase. Can be controlled. Further, in the core plate 140, the first notch portion 21 and the second notch portion 22 are arranged at four-fold symmetrical positions, so that the stator 5 of the motor having two or four slots is provided. Suitable for configuring. Further, the first notch portion 21 and the second notch portion 22 are positioned twice symmetrically, that is, the first notch portion 21 and the second notch portion 22 are arranged around the axis 100. It is also possible to arrange them at positions 180 degrees apart.

  Further, the shape of the stator 5 and the core plate 10 constituting the stator 5 is not limited to the number of slots, and various shapes are possible. For example, the shape of the teeth is not limited to the above. Furthermore, the stator which installed the insulator between the stator coil 35 and the teeth 36 may be sufficient. Further, the present invention is not limited to the brushless type, but can be applied to a brush type motor and a stator. Further, the present invention is not limited to an inner rotor type motor, and the present invention can be applied to an outer rotor as long as the outer rotor is a laminated type using an annular plate. Furthermore, the present invention is not limited to the stator of the motor, but can be applied to any hollow body in which a hollow portion is formed by laminating annular plates, and can also be applied to devices and parts for other uses. For example, a hollow filter that separates particles of an appropriate size and the like can be provided with communication holes of various diameters depending on the number of in-phase annular plates to be stacked. In an apparatus including a catalyst body such as an exhaust gas removing apparatus that needs to ensure a contact area with the catalyst body, an apparatus that can further increase the contact area and promote the catalytic reaction can be provided by multistage communication holes. Other examples include a nozzle that disperses and inputs / outputs a fluid, and a vibration isolator in which an annular elastic body is laminated. However, the present invention is not limited thereto.

1 Motor (electric motor), 5 Stator (stator), 6 Rotor (rotor)
10, 120, 130, 140 core plate,
11 inner periphery, 12 outer periphery,
21 a first notch, 22 a second notch, 23 an opening,
30 Stator core (stator core), 35 Stator coil (stator winding)
50 communication holes, 100 axes, 101 axial directions

Claims (14)

A hollow body having a laminated structure in which a plurality of annular plates are laminated in the axial direction,
Each of the annular plates includes a first cutout part in which a part on the inner peripheral side of the annular plate is cut out, a second cutout part in which a part on the outer peripheral side of the annular plate is cut out, And at least one opening through the annular plate,
The laminated structure portion is rotated and laminated around the axis such that the first notch, the second notch, and the at least one opening are arranged differently around the axis. The first notch, the at least one opening, and the second notch of the plurality of annular plates having different phase arrangements. The hollow body in which the communicating hole which connects the inner side and the outer side of the said hollow body through is formed.   The opening of each of the first notch, the second notch, and the at least one opening is at a position n times symmetrical about the axis of the annular plate. Arranged hollow body. However, n is an integer of 3 or more.   3. The laminated structure according to claim 1, wherein the laminated structure portion is laminated so that the first cutout portion, the second cutout portion, and the at least one opening portion are arranged around the axis. A hollow body including a plurality of the annular plates having the same in-phase arrangement, wherein the plate groups including the plurality of in-phase arrangement of the annular plates have different phases.   4. The first portion of the annular plate in which the first cutout portion is formed, the second portion in which the second cutout portion is formed, and the at least one of claim 1. A hollow body in which each opening of the two openings is wider than the other part of the annular plate.   5. The part according to claim 1, wherein the at least one opening part is partially at an angle with respect to the first notch when the adjacent annular plates are rotated around the axis. A hollow body that includes an opening that overlaps and partially overlaps the second notch at a different angle.   In any one of Claims 1 thru | or 5, when the said at least 1 opening part rotates adjacent said annular plates around the said axis | shaft, a part is with respect to the said 1st notch part at an angle. A second opening that partially overlaps the first opening that overlaps the second notch at a different angle, and a second that partially overlaps the first opening at a different angle. And a hollow body.   In any one of Claims 1 thru | or 5, when the said at least 1 opening part rotates adjacent said annular plates around the said axis | shaft, a part is with respect to the said 1st notch part at an angle. A first opening that overlaps, a second opening that partially overlaps the second notch at a different angle, and an opening on the outer peripheral side and an opening on the inner peripheral side and a part at a different angle A hollow body including a third opening overlapping with each other. A hollow body having a laminated structure in which a plurality of annular plates are laminated in the axial direction,
Each of the annular plates includes a first cutout part in which a part of the inner peripheral side of the annular plate is cut out, and a second cutout part in which a part of the outer peripheral side of the annular plate is cut out. Including
The stacked structure portion includes a plurality of different phases, wherein the first cutout portion and the second cutout portion are rotated and stacked around the axis so that the first cutout portion and the second cutout portion are arranged differently around the axis. Communication including the annular plate arranged and communicating the inner side and the outer side of the hollow body through at least the first notch part and the second notch part of the plurality of annular plates arranged in different phases A hollow body in which holes are formed.   9. The hollow body according to claim 1, wherein the annular plate is a ferromagnetic body, and the hollow body is a stator core of a motor.   The hollow body according to claim 9, wherein the hollow body is a stator further including a stator coil wound around the stator core.   In Claim 10, the said hollow body is a stator of the number of slots m, and the said 1st notch part and said 2nd notch part of the said annular plate are arrange | positioned in the (Cxm) times symmetrical position. A hollow body. However, the m is an integer of 1 or more, the C is an integer of 1 or more, and C × m is 3 or more.   A motor having the stator according to claim 10. An annular plate that forms a hollow laminated structure by being laminated in the axial direction,
A first notch part in which a part of the inner peripheral side of the annular plate is notched;
A second cutout portion in which a part of the outer peripheral side of the annular plate is cut out;
Having at least one opening through the annular plate;
A plurality of the annular plates are rotated about the axis such that the first notch, the second notch, and the at least one opening are arranged differently around the axis; When stacked, the stacking is performed via the first notch, the at least one opening, and the second notch of the annular plate stacked in different phases included in the plurality of annular plates. An annular plate in which a communication hole that communicates the inside and the outside of the structure is formed. A method for producing a hollow body including a laminated structure in which a plurality of annular plates are laminated in the axial direction,
Each of the annular plates includes a first cutout part in which a part on the inner peripheral side of the annular plate is cut out, a second cutout part in which a part on the outer peripheral side of the annular plate is cut out, And at least one opening through the annular plate,
The method is
At least some of the plurality of annular plates are arranged on the shaft such that the first notch, the second notch, and the at least one opening are arranged differently around the shaft. Rotating around and laminating the inner and outer sides of the hollow body via the first notch, the at least one opening, and the second notch of the annular plates of different arrangement Forming a communication hole for communication.

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