JP2014014215A - Stator for rotary electric machine - Google Patents

Abstract

An object of the present invention is to improve a space factor in a stator of a rotating electrical machine without making the assembly postures of the stator of the rotating electrical machine uneven.
A stator 30 of a rotating electrical machine 10 includes a stator core 40 having an annular yoke portion 42, and a plurality of teeth portions 44 formed to project radially from the inner peripheral side of the yoke portion 42, and a plurality of teeth. A stator coil 50 wound around each of the portions 44, each tooth portion 44 having a wide portion 45 formed on the outer diameter side of the tooth portion 44, and an inner diameter side of the teeth portion 44 relative to the wide portion 45. The stator coil 50 includes an outer diameter side coil 55 wound around the wide portion 45, and a narrow portion 46. And a deformed portion 57 provided in advance so as to connect the outer diameter side coil 55 and the inner diameter side coil 56 to each other.
[Selection] Figure 3

Description

  The present invention relates to an improved structure of a stator of a rotating electrical machine, particularly a stator core and a stator coil.

  Conventionally, a rotating electrical machine including a stator having a stator coil wound around a stator core and a rotor is known. For example, Patent Document 1 discloses a rotating electrical machine including a stator and a rotor. The stator of this rotating electrical machine includes a stator core having a plurality of slots, and a stator coil inserted into the slots and made of a flat plate conductor.

JP-A-2005-160143

  By the way, in the stator of a rotating electrical machine, the torque factor is increased by increasing the space factor indicating the ratio of the total cross-sectional area of the stator coil wound around the teeth to the cross-sectional area of the slot, which is the space between adjacent teeth. It is desirable to improve. In particular, when the installation target of the rotating electrical machine is, for example, a vehicle, it is necessary to install the rotating electrical machine in a limited space.

  An object of the present invention is to improve the space factor without making the assembly postures of the stator of the rotating electrical machine uneven.

  A stator of a rotating electrical machine according to the present invention includes a stator core having an annular yoke portion, and a plurality of teeth portions formed to project radially from the inner peripheral side of the yoke portion, and each of the plurality of teeth portions. Each of the teeth portions is formed on the outer diameter side of the teeth portion, and is formed on the inner diameter side of the teeth portion with respect to the wide portion. The stator coil includes an outer diameter side coil wound around the wide portion and an inner diameter side coil wound around the narrow portion. And a single coil wire having a deformed portion provided in advance so as to connect the outer diameter side coil and the inner diameter side coil.

  According to the present invention, since each of the teeth portions has a wide portion wider than the narrow portion on the outer diameter side, the teeth portion does not have the wide portion and the width of the entire teeth portion is wide. Compared to the case where the width is the same as the width of the narrow portion, the space on the outer diameter side of the tooth portion is narrowed by the wide portion. As a result, the effective sectional area of the slot is reduced, so that the space factor of the stator coil can be improved. Further, according to the present invention, the deforming portion connecting the outer diameter side coil wound around the wide portion and the inner diameter side coil wound around the narrow portion can be deformed so as not to protrude in the stator axial direction. it can. As a result, the arrangement of the bus bars for connecting the stator coils to form the stator coils can be optimized, so that the assembly posture of the rotating electrical machine can be adjusted and downsizing can be realized at the time of mounting.

In embodiment of the stator of the rotary electric machine which concerns on this invention, it is a figure which shows the outline of a structure of a rotary electric machine. It is an enlarged view of the dashed-dotted line A part of FIG. In embodiment of the stator of the rotary electric machine which concerns on this invention, it is a disassembled perspective view of a part of stator core and stator coil of a rotary electric machine. In embodiment of the stator of the rotary electric machine which concerns on this invention, it is a schematic diagram which shows a mode that a stator coil is wound around a teeth part. In embodiment of the stator of the rotary electric machine which concerns on this invention, it is a disassembled perspective view of a part of stator core and stator coil of a rotary electric machine. In other embodiment of the stator of the rotary electric machine which concerns on this invention, it is a schematic diagram which shows a mode that a stator coil is wound around a teeth part.

  Hereinafter, embodiments of a stator for a rotating electrical machine according to the present invention will be described in detail with reference to the accompanying drawings. Further, in this description, specific shapes, materials, numerical values, directions, and the like are examples for facilitating understanding of the present invention, and can be appropriately changed according to the use, purpose, specification, and the like.

  FIG. 1 is a diagram schematically illustrating the configuration of the rotating electrical machine 10. FIG. 2 is an enlarged view of an alternate long and short dash line A portion of FIG. FIG. 3 is an exploded perspective view of a part of the stator core 40 of the stator 30 and the stator coil 50 constituting the stator coil group 49. The rotating electrical machine 10 includes a rotor 20 attached to the rotating shaft 12 and a stator 30 arranged so that an inner peripheral surface thereof faces the outer peripheral surface of the rotor 20.

  The rotor 20 includes a rotor core 22 formed by stacking a plurality of annularly formed rotor members by punching a non-oriented electrical steel sheet, and a plurality of rectangular shapes penetrating the vicinity of the outer peripheral surface of the rotor core 22 in the axial direction. The rotor includes a plurality of permanent magnets 24 fitted into the through holes.

  The stator 30 includes a stator core 40 formed by stacking a plurality of annularly formed stator members by punching a non-oriented electrical steel sheet, and a stator coil group 49 wound around the stator core 40. It is. The stator coil group 49 is formed by connecting a plurality of stator coils 50 with bus bars (not shown). 1 and 2 show the stator coil 50 in a cross section orthogonal to the axial direction of the stator core 40 in consideration of easy viewing.

  The stator core 40 has an annular yoke portion 42 and a plurality of teeth portions 44 formed on the inner peripheral side of the yoke portion 42. The teeth portion 44 has a shape that protrudes radially inward (inner circumferential side) from the yoke portion 42.

  Each of the plurality of tooth portions 44 includes a wide portion 45 formed on the yoke portion 42 side, that is, the outer diameter side of the teeth portion 44, and is formed on the inner diameter side of the teeth portion 44 with respect to the wide portion 45 and from the wide portion 45. And a narrow portion 46 formed to be narrow. Here, the “width” means the circumferential length of the stator core 40.

  The wide portion 45 is formed to have the same length W1 from the outer diameter side of the tooth portion 44 to the intermediate portion. The narrow portion 46 is formed to have the same length W2 (<W1) from the intermediate portion of the teeth portion 44 to the inner diameter side. Further, the wide portion 45 and the narrow portion 46 are formed such that the length along the radial direction of the stator core 40 is the same length d. In the wide portion 45, step surfaces 45 a and 45 b perpendicular to the radial direction of the stator core 40 are formed at the boundary with the narrow portion 46.

  A slot 48 is formed as a space between adjacent tooth portions 44 of the stator core 40. As shown in FIGS. 1 and 2, the width of the slot 48 becomes narrower from the yoke portion 42 side toward the intermediate portion, becomes the maximum width again at the intermediate portion, and becomes narrower from the intermediate portion toward the rotor 20 side. It has become.

  The stator coil 50 is wound around each of the plurality of tooth portions 44, and includes an outer diameter side coil 55 wound around the wide portion 45, and an inner diameter side coil 56 wound around the narrow portion 46. The outer diameter side coil 55 and the inner diameter side coil 56 are provided with a deformed portion 57 provided in advance. The outer diameter side coil 55, the inner diameter side coil 56, and the deformed portion 57 are integrally formed as a single coil wire, and are composed of rectangular wires having the same area and the same cross section. The rectangular wires constituting the outer diameter side coil 55, the inner diameter side coil 56, and the deforming portion 57 are made of a highly conductive metal such as copper, for example, and are provided with an insulating coating around the periphery. Further, the outer diameter side coil 55 and the inner diameter side coil 56 are formed as cassette coils wound in advance before being attached to the tooth portion 44.

  The outer diameter side coil 55 is formed so that the inner diameter along the width direction is the same r1 from the outer diameter side to the intermediate portion of the tooth portion 44, and the outer diameter along the width direction is the same R1. . The inner diameter side coil 56 has the same inner diameter along the width direction r2 (<r1) from the intermediate portion to the inner diameter side of the tooth portion 44, and the same outer diameter along the width direction R2 (<R1). It is formed as follows.

  As described above, the outer side coil 55 and the inner side coil 56 use the same rectangular wire. Further, the length r1 is slightly larger than the length W1, which is the width of the wide portion 45, so that a slight gap is formed for fitting the outer diameter side coil 55 into the wide portion 45. Similarly, the length r <b> 2 is slightly larger than the length W <b> 2 that is the width of the narrow portion 46 so as to form a slight gap for fitting the inner diameter side coil 56 into the narrow portion 46. . Since the length R1 is equal to or shorter than the length L, which is the minimum distance between the tooth portions 44 adjacent to the tooth portion 44 to which the outer diameter side coil 55 is attached, the outer diameter side coil 55 can be fitted into the tooth portion 44. .

  The lengths of the outer diameter side coil 55 and the inner diameter side coil 56 along the radial direction of the stator core 40 are both formed to be substantially the same as the wide portion 45 and the narrow portion 46, and the outer diameter side coil 55. And the inner diameter side coil 56 are adjacent to each other along the radial direction of the stator core 40.

  About the outer diameter side coil 55 and the inner diameter side coil 56, the minimum distance between the adjacent outer diameter side coils 55 and between the adjacent inner diameter side coils 56 is configured to be lengths a1 and a2, respectively. The lengths a1 and a2 are determined to be a necessary minimum distance within a range in which insulation can be secured between the adjacent outer diameter side coils 55 and between the adjacent inner diameter side coils 56.

  As shown in FIG. 3, the length D along the radial direction of the stator core 40 of the deformed portion 57 before being attached to the teeth portion 44 is longer than the radial length d of the narrow portion 46. That is, during the operation of inserting the outer diameter side coil 55 into the wide portion 45, the inner diameter side coil 56 is permitted by the length of the deformed portion 57 without considering the relative position with the narrow portion 46 as the insertion destination. Can take any free position. Thus, when the outer diameter side coil 55 is fitted into the wide portion 45, the inner diameter side coil 56 is placed at a free position, and there is an advantage that the fitting operation is easy.

  As described above, in the stator 30 of the rotating electrical machine 10, each of the tooth portions 44 of the stator core 40 has the wide portion 45 wider than the narrow portion 46, the yoke portion 42 side of the narrow portion 46 (the teeth portion 44 of On the outer diameter side). Therefore, compared with the case where the teeth portion 44 does not have the wide portion 45 and the entire width of the teeth portion 44 is the same length W2 as the width of the narrow portion 46, the outer diameter side of the teeth portion 44 in the slot 48 The space is narrowed by the wide portion 45. As a result, the effective cross-sectional area in the slot 48 is reduced, so that the space factor of the stator coil 50 can be improved even if the total cross-sectional area occupied by the stator coil 50 in the slot 48 is the same.

  Next, a procedure for attaching the stator coil 50 to the stator core 40 in the stator 30 of the rotating electrical machine 10 will be described with reference to FIG. FIG. 4A is a schematic diagram showing a state in which the outer diameter side coil 55 is fitted into the wide portion 45. FIG. 4B is a schematic diagram showing a state in which the inner diameter side coil 56 is inserted into the narrow portion 46 after the outer diameter side coil 55 is inserted into the wide portion 45. 4A and 4B are cross-sectional views in which the stator core 40 is indicated by phantom lines, and the outer diameter side coil 55 and the inner diameter side coil 56 are orthogonal to the axial direction of the stator core 40 for ease of viewing. The deformed portion 57 is shown in a plan view orthogonal to the axial direction of the stator core 40.

  When inserting the stator coil 50 into the stator core 40, first, as shown in FIG. 4 (a), the inner diameter side coil 56 is made free without being inserted into the teeth portion 44, and the outer diameter side coil 55 is widened. It fits into the part 45. This is performed for all the outer diameter side coils 55. Thereafter, as shown in FIG. 4B, the inner diameter side coil 56 is fitted into the narrow portion 46 while being bent in the radial direction so that the deformable portion 57 does not protrude in the axial direction. This is performed for all the inner diameter side coils 56. Thus, since the inner diameter side coil 56 is not inserted into the narrow portion 46 until all the outer diameter side coils 55 are inserted into the wide portion 45, the inner diameter side coil 56 is present when the outer diameter side coil 55 is inserted. There is no hindrance to insertion.

  As described above, in the stator 30, the outer diameter side coil 55 and the inner diameter side coil 56 are electrically connected in advance by the deformable portion 57. Here, if the outer diameter side coil 55 and the inner diameter side coil 56 are temporarily welded, the welding point protrudes in the axial direction, so that the welding point interferes with the arrangement of the bus bars connecting the stator coils 50, In the present embodiment, since the deformable portion 57 is bent in the radial direction so as not to protrude in the axial direction, the deformable portion 57 does not interfere with the arrangement of the bus bars. Thereby, since arrangement | positioning of a bus bar can be performed optimally, the stator 30 can be reduced in size. Therefore, according to the present embodiment, it is possible to improve the space factor while adjusting the assembly posture and reducing the size of the stator 30. Further, since the deformable portion 57 does not interfere with the arrangement of the bus bars as described above, the connection work of the stator 30 can be facilitated.

  Next, a stator 31 that is a modification of the present embodiment will be described. FIG. 5 is an exploded perspective view of a part of the stator core 40 of the stator 31 and the stator coil 54. Since the difference from the embodiment of FIG. 3 is the inner diameter side coil 58 and the deformed portion 59, the difference will be mainly described.

  As shown in FIG. 5, the inner diameter side coil 58 before being attached to the tooth portion 44 has a positional relationship substantially perpendicular to the outer diameter side coil 55, and the height along the axial direction is the outer diameter side coil. It is arranged so as to have a positional relationship higher than 55. That is, when the outer diameter side coil 55 is inserted into the wide portion 45, the inner diameter side coil 58 is in a retracted position where it does not contact the narrow portion 46 that is the insertion destination, and obstructs the insertion work of the outer diameter side coil 55. There is an advantage of not becoming. Moreover, the deformation | transformation part 59 is comprised with the material similar to the deformation | transformation part 57 of embodiment mentioned above, and when the inner diameter side coil 58 is inserted in the narrow part 46, it can deform | transform so that it may not protrude in an axial direction. .

  Next, a procedure for attaching the stator coil 54 to the stator core 40 will be described with reference to FIG. FIG. 6A is a schematic diagram showing a state in which the outer diameter side coil 55 is fitted into the wide portion 45. FIG. 6B is a schematic view showing a state in which the inner diameter side coil 58 is inserted into the narrow portion 46 after the outer diameter side coil 55 is inserted into the wide portion 45.

  When attaching the stator coil 54 to the stator core 40, first, as shown in FIG. 6A, the inner diameter side coil 58 is free from the teeth portion 44 and the outer diameter side coil 55 is fitted into the wide portion 45. To do. This is performed for all the outer diameter side coils 55. Thereafter, as shown in FIG. 6B, the inner diameter side coil 58 is adjacent to the outer diameter side coil 55 along the radial direction of the stator core 40, and the deformed portion 59 does not protrude in the axial direction. The inner diameter side coil 58 is fitted into the narrow portion 46 while twisting and deforming the deformable portion 59. This is performed for all the inner diameter side coils 58. As described above, since the inner diameter side coil 58 does not correspond to the narrow portion 46 until all the outer diameter side coils 55 are fitted in the wide portion 45, the inner diameter side coil 58 is present when the outer diameter side coil 55 is fitted. There is no hindrance to insertion.

  As described above, in the stator 31, the outer diameter side coil 55 and the inner diameter side coil 58 are integrally connected by the deforming portion 59. Further, since the deformable portion 59 is twisted so as not to protrude in the axial direction, the deformable portion 59 does not interfere with the arrangement of the bus bars that connect the stator coils 54 to each other.

  The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

  DESCRIPTION OF SYMBOLS 10 Rotating electrical machine, 12 Rotating shaft, 20 Rotor, 22 Rotor core, 24 Permanent magnet, 30, 31 Stator, 40 Stator core, 42 Yoke part, 44 Teeth part, 45 Wide part, 45a, 45b Step surface, 46 Narrow part, 48 Slot, 49 Stator coil group, 50, 54 Stator coil, 55 Outer diameter side coil, 56, 58 Inner diameter side coil, 57, 59 Deformation part.

Claims (1)

A stator core having an annular yoke portion and a plurality of tooth portions formed to project radially from the inner peripheral side of the yoke portion;
A stator coil wound around each of the plurality of tooth portions;
With
Each of the teeth portions includes a wide portion formed on the outer diameter side of the teeth portion, and a narrow portion formed on the inner diameter side of the teeth portion with respect to the wide portion and narrower than the wide portion. And
The stator coil is connected in advance so as to connect the outer diameter side coil wound around the wide portion, the inner diameter side coil wound around the narrow portion, and the outer diameter side coil and the inner diameter side coil. A stator for a rotating electrical machine, comprising a single coil wire having a deformed portion provided.

Images