JP2014121214A - Rotary electric machine and insulator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rotary electric machine that has, as an example, an insulator of a new configuration lessened in inconvenience, and to provide an insulator.SOLUTION: A rotary electric machine according to an embodiment comprises: a core that has a plurality of teeth extending in a radial direction of a rotary shaft and arranged in a circumferential direction with one and the other circumferential faces of the rotary shaft, and that are provided with slots between the teeth; a plurality of coils composed of winding wound around the teeth; and insulator that has a wall part including a plurality of portions located in the slots and different from one another in thickness and partly covering a face, and that is interposed between the core and the coils.

Description

  Embodiments described herein relate generally to a rotating electrical machine and an insulator.

  2. Description of the Related Art Conventionally, a rotating electrical machine provided with an insulator that insulates between a core tooth and a coil is known.

JP-A-8-149732

  In this type of rotating electrical machine, for example, it may be preferable if the insulator can be made into a new configuration with less inconvenience.

  As an example, the rotating electrical machine according to the embodiment of the present invention includes a plurality of teeth that extend in the radial direction of the rotating shaft and have one side and the other side in the circumferential direction of the rotating shaft and are arranged in the circumferential direction. And having a core provided with a slot between the plurality of teeth, a plurality of coils formed by windings wound around the plurality of teeth, and a plurality of portions located in the slot and having different thicknesses Including at least a part including a wall portion covering the surface, an insulator interposed between the core and the coil. Therefore, according to the present embodiment, as an example, securing (increasing) the area (number of windings) through which the coil passes in the slot and the rigidity and strength of the insulator are more easily compatible.

  In the rotating electrical machine, as an example, the wall portion is thicker than the first portion and the first portion located between the surface and the portion located in the slot of the coil. And a second part. Therefore, according to the present embodiment, as an example, the first portion is likely to be thinner because the rigidity and strength are easily secured in the second portion.

  Moreover, in the said rotary electric machine, the level | step difference was provided between the said 1st part and said 2nd part of the said wall part as an example. Therefore, according to this embodiment, as an example, it is easy to suppress the windings from moving in or out of the slot.

  Moreover, in the said rotary electric machine, as an example, the said wall part had the said 1st part interposed between two said 2nd parts. Therefore, according to the present embodiment, as an example, a decrease in rigidity and strength of the wall portion is easily suppressed by the second portion.

  Moreover, in the said rotary electric machine, as an example, the said wall part had the said 2nd part interposed between two said 1st parts. Therefore, according to the present embodiment, as an example, a decrease in rigidity and strength of the wall portion is easily suppressed by the second portion.

  In the rotating electrical machine, as an example, the wall portion is positioned between one end portion in the radial direction and the other end portion in the radial direction of the slot, and the one side in the circumferential direction of the slot. It had a portion extending between the surface and the surface on the other side. Therefore, according to the present embodiment, as an example, the mass of the insulator is likely to be smaller than in the case where the wall portion is configured between the end portions in the radial direction of the slot.

  In the rotating electrical machine, a portion of the slot extending between the surface on one side in the circumferential direction and the surface on the other side is the second portion. Therefore, according to the present embodiment, as an example, a decrease in rigidity and strength of the wall portion is easily suppressed by the above-described portion where the thickness is relatively easily secured.

  Further, in the rotating electrical machine, the first wall portion is located in the first slot, the radial length of the first length is the first length, and the second slot, And the second wall portion whose length in the radial direction is shorter than the first length. Therefore, according to this embodiment, as an example, the mass of the insulator tends to be smaller.

  In the rotating electrical machine, the radial length of the first slot is longer than the radial length of the second slot. Therefore, according to the present embodiment, as an example, the wall portion of the first slot is likely to be longer in the radial direction. Therefore, as an example, the wall portion is likely to be partially thickened. Therefore, as an example, a decrease in rigidity and strength of the wall portion is easily suppressed.

  Moreover, the insulator concerning embodiment of this invention is used with the said rotary electric machine as an example. Therefore, according to the present embodiment, as an example, since the wall portion of the insulator has a portion having a different thickness in the slot of the rotating electrical machine, as an example, in the rotating electrical machine, securing a winding region in the slot ( Increase) and the rigidity and strength of the insulator are more easily compatible.

FIG. 1 is a schematic view of a part of an example of the rotating electrical machine according to the embodiment as seen from the direction of the rotation axis. FIG. 2 is a schematic view of the core of an example of the rotating electrical machine according to the embodiment as viewed from the direction of the rotation axis. Drawing 3 is a mimetic diagram seen from the direction of a rotation axis of an assembly of a core of an example of a rotating electrical machine concerning an embodiment, and one insulator. Drawing 4 is a mimetic diagram seen from the direction of a rotation axis of an insulator of an example of a rotary electric machine concerning an embodiment. FIG. 5 is an enlarged view of a part of FIG. FIG. 6 is a schematic view of an assembly of an example of a rotating electrical machine according to a modified example and an insulator, viewed from the direction of the rotation axis.

  The following embodiments and modifications include the same configuration. Similar components are denoted by common reference numerals, and redundant description is omitted. In the following description, unless otherwise specified, the axial direction indicates the axial direction of the rotational axis Ax, the radial direction indicates the radial direction of the rotational axis Ax, and the circumferential direction indicates the circumferential direction of the rotational axis Ax.

<Embodiment>
In this embodiment, as an example, in the rotating electrical machine 1 shown in FIGS. 1 to 5, the core 2 to which the plurality of coils 4 are attached rotates around the rotation axis Ax, and the yoke 3 to which the plurality of magnets 5 are attached. It is fixed. Further, the yoke 3 is configured in a cylindrical shape (annular shape), and surrounds (covers) the outer peripheral side (the outer side in the radial direction) of the core 2 with a space therebetween. That is, in this embodiment, as an example, the movable portion 10 as the inner rotor includes the core 2 and the coil 4, and the fixed portion 11 as the outer stator includes the yoke 3 and the magnet 5. Moreover, the movable part 10 is an armature, and the fixed part 11 is a field. The rotating electrical machine 1 is a DC brush motor. The core 2 is fixed to the shaft 6. The shaft 6 is supported by the case 7 via a bearing (not shown) so as to be rotatable about the rotation axis Ax. The yoke 3 can constitute a part of the case 7.

  In the present embodiment, as an example, as shown in FIG. 2, the core 2 includes a columnar base portion 2 a and a plurality of teeth 21 extending radially from the base portion 2 a in the radial direction. Yes. The core 2 has a shape shown in FIG. 2 as viewed from the axial direction, and has a predetermined thickness (height) along the axial direction (that is, a direction perpendicular to the paper surface of FIG. 2). . The core 2 can be configured, for example, by laminating thin plates of magnetic material (for example, iron-based material) in the axial direction.

  The core 2 has a cylindrical surface (cylindrical surface) -shaped surface 2b (circumferential surface, side surface, edge) centered on the rotation axis Ax on one side in the radial direction (in the present embodiment, the outer side in the radial direction as an example). Have. A plurality of slots 22 (recesses, notches, notches, openings) extending toward the other side in the radial direction (in the present embodiment, the inner side in the radial direction as an example) are formed on the surface 2b of the core 2. Has been. The plurality of slots 22 are all provided in the same shape and at a constant pitch (interval). In the present embodiment, as an example, 24 slots 22 are provided every 15 ° (deg) in the circumferential direction. The slot 22 includes a constricted portion 22a (slit) on one side (outside) in the radial direction and an accommodating portion 22b (chamber) on the opposite side (the other side (inside) in the radial direction). A coil 4 (winding 4a (wiring), see FIG. 1) is accommodated in the accommodating portion 22b. The width of the accommodating portion 22b becomes narrower as the distance from the constricted portion 22a increases. The accommodating portion 22b has a fan-shaped, isosceles triangular shape, or arrowhead-shaped appearance as viewed from the axial direction.

  In the core 2, teeth 21 are formed between a plurality of slots 22. The teeth 21 have an arm portion 21a extending from the base portion 2a along one side (outer side) in the radial direction, and projecting portions 21b projecting on both sides in the circumferential direction on the distal end side of the arm portion 21a. That is, the teeth 21 have a T-shaped (hammer-like) appearance. The teeth 21 include a surface 21c on one side in the circumferential direction (in the present embodiment, the clockwise direction side as an example), and a surface 21d on the other side (in the present embodiment, the counterclockwise direction side as an example) have. Each slot 22 includes a surface 21d on the other side in the circumferential direction of the tooth 21 on one side in the circumferential direction of the slot 22 and a surface 21c on the other side in the circumferential direction of the tooth 21 on the other side in the circumferential direction of the slot 22. Is coming. The surface 21c and the surface 21d face each other in the circumferential direction with the slot 22 interposed therebetween. Moreover, the surface 2c (end surface) of the axial direction of the core 2 is comprised by planar shape as an example.

  Further, as shown in FIG. 1, the coil 4 is configured by winding the winding 4 a (wiring) around the teeth 21. In the present embodiment, each coil 4 is wound around a plurality of teeth 21 in a so-called distributed winding manner. As an example, in this embodiment, each coil 4 is wound around three teeth 21 adjacent to each other in a state where the three teeth 21 are bundled. As shown in FIG. 5, each coil 4 includes a portion 4 b along the surface 2 c (end surface) of the core 2 and a portion 4 c (portion positioned in the slot 22) that penetrates the slot 22 in the axial direction. Have. In the present embodiment, the coils 4 wound around the plurality of teeth 21 are stacked in a plurality of stages in the radial direction in a so-called overlapping winding manner. In the present embodiment, as an example, the coils 4 wound around the three teeth 21 are stacked in three stages in the radial direction. Further, the circumferential position around which the coil 4 is wound is shifted to one side in the circumferential direction by one slot 22 (one tooth 21) between each stage.

  In this embodiment, as an example, an insulator 30 is provided between the core 2 and the coil 4 as shown in FIG. The insulator 30 is made of an insulating material such as an epoxy resin. That is, the insulation between the core 2 and the coil 4 can be improved by the insulator 30. For example, the insulator 30 can be configured by injection molding of a thermoplastic resin (synthetic resin material) or the like.

  As shown in FIGS. 4 and 5, the insulator 30 has a wall portion 31 positioned in each slot 22. The shape of the wall portion 31 differs depending on the position of the coil 4 (part 4c) passing through the slot 22. Therefore, in this embodiment, as an example, the insulator 30 has three types of wall portions 31 (31A to 31C) having different lengths in the radial direction (width, La to Lc, La> Lb> Lc). . The walls 31A to 31C have a U-shaped or V-shaped appearance when viewed from the axial direction. Further, the wall portions 31A to 31C have a plurality of portions 31a to 31d having different thicknesses along the surfaces 21c and 21d, respectively, in the slot 22.

  In each wall part 31A-31C, the part 31a is located in the circumferential direction of the protrusion part 21b. Further, the portion 31 c is located between the portion 4 c in the slot 22 of the coil 4 and the surfaces 21 c and 21 d of the teeth 21. The position of the portion 31 c in the radial direction in the slot 22 is different in each of the wall portions 31 </ b> A to 31 </ b> C depending on the position of the portion 4 c of the coil 4. The part 31b is interposed between the part 31a and the part 31c. The portion 31 b is not covered with the portion 4 c of the coil 4. Further, the portion 31d extends between the surface 21c and the surface 21d. In other words, the portion 31d connects the portions 31a to 31c covering the circumferential surface 21c facing the slot 22 and the portions 31a to 31c covering the circumferential surface 21d.

  Here, in the present embodiment, as will be apparent from FIG. 5, as an example, the thickness t of the portion 31 c positioned between the portion 4 c of the coil 4 and the surfaces 21 c and 21 d of the teeth 21 is the portion It is thinner than the other portions 31b and 31d connected to 31c. Therefore, according to the present embodiment, as an example, a region through which the coil 4 passes (a region in which the portion 4c of the coil 4 exists, the number through which the winding 4a (wiring) passes) is easily secured. Therefore, according to the present embodiment, as an example, the performance of the rotating electrical machine 1 is easily improved as compared with the case where the thickness of the portion 31 c of the wall portion 31 facing the portion 4 c of the coil 4 is thicker. In the present embodiment, as an example, the thickness of the portions 31b and 31d is greater than the thickness of the portion 31a.

  For example, multipolarization is effective for reducing the size and weight of the rotating electrical machine 1. This is because, for example, it is easy to reduce the overhang of the coil end in the axial direction and to make the stator magnet and yoke thin. Here, as an example, when the rotating electrical machine 1 is a direct current brush motor, the number of teeth 21 (slots 22) is increased in order to shorten the life of the brush and suppress the increase in noise when switching to multi-pole. It is desirable to make the change in electrical energy smaller. However, if the number of the slots 22 increases with the thickness of the wall portion 31 of the insulator 30 provided in the slot 22 as it is, the cross-sectional area (rotation) per slot 22 increases as the number of the slots 22 increases. The sectional area of the wall portion 31 with respect to the sectional area of one slot 22 tends to increase. As a result, the number of windings 4a that can penetrate through the slot 22 (the cross-sectional area of the coil 4) tends to decrease, and the performance of the rotating electrical machine 1 tends to deteriorate. However, if the thickness of the wall portion 31 is entirely reduced in the slot 22, for example, when the insulator 30 is formed (configured), defects are likely to occur in the wall portion 31, There is a possibility that an inconvenient situation may occur such that the rigidity and strength of the portion 31 become low and it becomes difficult to assemble the insulator 30. In this respect, in the present embodiment, as an example, the wall portion 31 includes a plurality of portions 31a to 31d having different thicknesses, and hence the thickness and the lowering of rigidity and strength are suppressed by the thicker portions 31b and 31d. It is easy to be performed (easily secured and increased), and the decrease in the number of windings 4a of the coil 4 is easily suppressed by the thinner portion 31c (easily secured and easily increased). That is, according to the present embodiment, as an example, securing (increasing) the area (number of windings) through which the coil 4 passes in the slot 22 and the rigidity and strength of the insulator 30 are more easily compatible. In other words, by including the thick portions 31 b and 31 d in the wall portion 31, it is easy to include the thin portion 31 c in the wall portion 31, or the thickness of the portion 31 c in contact with the coil 4 (covered by the coil 4) is thinner. Easy to be configured. In the present embodiment, the portion 31c is an example of a first portion, and the portions 31b and 31d are examples of a second portion. For example, when the insulator 30 is formed by injection molding of a synthetic resin material, the resin is supplied from the molds corresponding to the thicker parts 31b and 31d into the mold corresponding to the thinner part 31c. Therefore, there is an advantage that molding defects and the like are less likely to occur as compared with a thin configuration as a whole.

  In the present embodiment, as an example, the thicker portions 31b and 31d do not contact the coil 4 in the slot 22 (not covered by the coil 4). Therefore, according to this embodiment, as an example, there are few demerits by increasing the thickness of the parts 31b and 31d. That is, according to the present embodiment, as an example, the required rigidity and strength of the wall portion 31 are easily secured or increased by more effectively using the dead space in the slot 22 (the region where the coil 4 does not penetrate). .

  Moreover, in this embodiment, the level | step difference 31e is provided between the thicker part 31b and the thinner part 31c of the wall part 31 as an example. Therefore, according to the present embodiment, as an example, when the winding 4 a is wound around the tooth 21, it is easy to suppress the winding 4 a from moving in the slot 22 or coming out of the slot 22. Further, the movement of the coil 4 with respect to the core 2 is easily suppressed.

  Moreover, the front-end | tip part of the protrusion part 31f provided in the level | step difference 31e which protruded in the direction away from the surfaces 21c and 21d is comprised by the curved surface shape. Therefore, according to the present embodiment, as an example, when the winding 4a is wound, it is easy to be suppressed from being caught by the protrusion 31f (step 31e). Therefore, as an example, it is difficult to cause inconveniences such as time-consuming assembly work and damage to the winding 4a caught on the protrusion 31f.

  In the present embodiment, as an example, as shown in FIG. 5, the thinner portion 31 c is interposed between the two thicker portions 31 b and 31 d. Therefore, according to the present embodiment, as an example, compared to a case where there is a thicker portion only on one side of the thinner portion 31c, a decrease in rigidity and strength of the wall portion 31 is easily suppressed. Moreover, it is hard to produce a molding defect etc.

  In the present embodiment, as an example, as shown in FIG. 5, the thicker portion 31d is interposed between two thinner portions 31c and 31c. Therefore, according to this embodiment, as an example, the two portions 31c and 31c can be reinforced by the portion 31d. Therefore, as an example, the decrease in rigidity and strength of the wall portion 31 is easily suppressed by the portion 31d. Moreover, compared with the case where two thicker portions 31d are provided in each of the two thinner portions 31c, 31c, the rigidity of the two portions 31c, 31c can be compensated more efficiently with a smaller volume. .

  Further, in the present embodiment, as an example, as shown in FIG. 5, in the wall portions 31 </ b> B and 31 </ b> C corresponding to the slot 22 where the coil 4 is not on the other side (inner side and inner side) of the slot 22 in the radial direction, 31d is positioned between one end 22c and the other end 22d in the radial direction of the slot 22, and between the surface 21c on the other side in the circumferential direction of the slot 22 and the surface 21d on the other side. Across. Therefore, according to the present embodiment, as an example, the wall portion 31 spans the end portion 22c on the one side in the radial direction of the slot 22 and the end portion 22d on the other side (the other side in the radial direction (inner side, rear side). The mass of the insulator 30 is likely to be smaller than in the case of the configuration up to the side). Therefore, as an example, the waste of the material constituting the insulator 30 is likely to be reduced. Further, as an example, in the case where the insulator 30 is attached by being inserted into the slot 22, the resistance when the insulator 30 is inserted into the slot 22 tends to be smaller.

  Further, in the present embodiment, as an example, as shown in FIG. 5, a portion 31d between the wall 21B, 31C and the surface 22c on the one side in the circumferential direction of the slot 22 and the surface 21d on the other side. Is thicker than the portion 31c. Therefore, according to the present embodiment, as an example, the portion 31d at a position where the thickness is relatively easily secured can easily suppress the decrease in rigidity and strength of the wall portion 31. That is, according to the present embodiment, as an example, the required rigidity and strength of the wall portion 31 are easily secured or increased by more effectively using the dead space in the slot 22.

  In the present embodiment, as an example, as shown in FIG. 5, the insulator 30 includes a plurality of wall portions 31 </ b> A to 31 </ b> C having different radial lengths (La to Lc, La> Lb> Lc). Yes. Therefore, according to the present embodiment, as an example, when all the slots 22 are provided with the wall portions 31 extending between the one end portion 22c in the radial direction of the slot 22 and the other end portion 22d. As compared with the above, the mass of the insulator 30 tends to be smaller. Moreover, as an example, the waste of the material which comprises the insulator 30 is easy to reduce. Further, as an example, in the case where the insulator 30 is attached by being inserted into the slot 22, the resistance when the insulator 30 is inserted into the slot 22 tends to be smaller.

  In the present embodiment, as an example, as shown in FIG. 4, the plurality of wall portions 31 corresponding to the plurality of slots 22 are along the axial surface 2 c (end surface, see FIG. 1) of the core 2. It is connected (coupled and integrated) to a plate-like and annular wall 32. Therefore, according to the present embodiment, as an example, the insulator 30 is more easily handled as compared to the case where the plurality of wall portions 31 are provided separately. Further, the two insulators 30 having such a configuration can be inserted and attached from both sides of the core 2 in the axial direction.

  As described above, in the present embodiment, as an example, the wall portion 31 that is positioned in the slot 22 of the insulator 30 and covers the circumferential surfaces 21c and 21d of the teeth 21 has a plurality of portions 31a having different thicknesses. ~ 31d are included. Therefore, according to the present embodiment, as an example, securing (increasing) the area (the number of windings 4a) through which the coil 4 passes in the slot 22 and the rigidity and strength of the insulator 30 are more easily compatible.

<Modification>
In the modification shown in FIG. 6, as an example, the radial length Lsa of the slot 22A in which the wall portion 31A is accommodated is the radial length of the other slot 22 in which the wall portions 31B and 31C are accommodated. Longer than Lsb. According to the present modification, as an example, in the slot 22A, for example, the wall portion 31A is easily configured to be longer in the radial direction. Therefore, as an example, the portion 31d of the wall portion 31A tends to be thicker. Therefore, as an example, a decrease in rigidity and strength of the wall portion 31A is easily suppressed. In addition, 1 A of rotary electric machines concerning the modification of FIG. 6 are equipped with the structure similar to the said embodiment except the point mentioned above. Therefore, also by this modification, the same result (effect) based on the structure similar to the said embodiment is acquired.

  As mentioned above, although embodiment and the modification of this invention were illustrated, the said embodiment and modification are an example to the last, Comprising: It is not intending limiting the range of invention. These embodiments and modifications can be implemented in various other forms, and various omissions, replacements, combinations, and changes can be made without departing from the scope of the invention. In addition, the configuration and shape of each embodiment or modification may be partially exchanged. In addition, specifications (structure, type, direction, shape, size, length, width, thickness, height, number, arrangement, position, material, etc.) of each configuration, shape, display element, etc. It can be changed and implemented. In the said embodiment and modification, although the case where a rotary electric machine was comprised as a direct current brush motor was illustrated, this invention is not limited to the said embodiment or modification, and the coil of distributed winding and lap winding is mounted. The present invention can be applied to any configuration. Further, the present invention can be applied not only to the rotor but also to a case where a coil is mounted on the stator, and to a configuration in which the teeth protrude inward in the radial direction. Moreover, this invention is not limited to implementation as an insulator shape | molded by injection molding, It can also be implemented as an insulator manufactured with the various manufacturing method.

  DESCRIPTION OF SYMBOLS 1 ... Rotary electric machine, 2 ... Core, 21 ... Teeth, 21c ... Surface, 21d ... Surface, 22 ... Slot, 22c, 22d ... End part, 30 ... Insulator, 31 ... Wall part, 31A ... Wall part, 31B, 31C ... Wall part, 31a ... part, 31b ... (second) part, 31c ... (first) part, 31d ... (second) part (crossed part), 31e ... step, 4 ... coil, 4a ... winding line.

Claims (10)

A plurality of teeth extending in the radial direction of the rotating shaft and having a surface on one side and the other side in the circumferential direction of the rotating shaft and arranged in the circumferential direction, and a slot is provided between the plurality of teeth. The core,
A plurality of coils composed of windings wound around the plurality of teeth;
An insulator interposed between the core and the coil, including a wall portion including a plurality of portions located in the slot and having different thicknesses, and at least a portion covering the surface;
Rotating electric machine with   The wall portion has a first portion positioned between the surface and a portion of the coil positioned in the slot, and a second portion thicker than the first portion. Item 2. The rotating electrical machine according to Item 1.   The rotating electrical machine according to claim 2, wherein a step is provided between the first portion and the second portion of the wall portion.   4. The rotating electrical machine according to claim 2, wherein the wall portion includes the first portion interposed between two of the second portions.   The rotating electrical machine according to any one of claims 2 to 4, wherein the wall portion includes the second portion interposed between the two first portions.   The wall is positioned between one end of the slot in the radial direction and the other end of the slot, and between the surface on the one side in the circumferential direction of the slot and the surface on the other side. The rotating electrical machine according to any one of claims 2 to 5, wherein the rotating electrical machine has a portion extending between the two.   The rotation according to any one of claims 2 to 6, wherein a portion of the slot extending between the surface on one side in the circumferential direction and the surface on the other side is the second portion. Electric. The first wall located in the first slot, the radial length of which is a first length;
A second wall located in the second slot, the radial length of which is shorter than the first length;
The rotating electrical machine according to claim 1, comprising:   The rotating electrical machine according to claim 8, wherein a length of the first slot in the radial direction is longer than a length of the second slot in the radial direction.   An insulator used in the rotating electrical machine according to any one of claims 1 to 9 and provided with the wall portion.

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