JP2023171054A - Rotary electric machine - Google Patents

Abstract

To provide a rotary electric machine capable of further improving ease of assembling a bus bar.SOLUTION: A rotary electric machine 1 includes a rotor 2, a stator 3, a rotor shaft 4, a sub shaft 5, a slip ring 22, and a bus bar 23. The bus bar 23 has a first portion 23a located between the slip ring 22 and a shaft portion 5a, extending along an outer peripheral surface 5d of the shaft portion 5a, and inserted into a through hole 5c and a second portion 23b extending outward in a radial direction R from the first portion 23a via a bent portion 23c located on the opposite side of the slip ring 22 of a flange portion 5b in an axial direction X, and electrically connects the slip ring 22 and a field winding 11.SELECTED DRAWING: Figure 1

Description

The present invention relates to a rotating electrical machine.

Patent Document 1 discloses that a bus bar includes a base portion that overlaps another bus bar in the axial direction, a connecting portion extending from the base portion in the radial direction, and a stepped portion located between the connecting portion and the base portion and extending toward the other bus bar. A rotating electrical machine is disclosed that is provided with and.

JP2020-088877A

By the way, in this type of rotating electric machine, there is room for further improvement in terms of ease of assembling the bus bar, for example.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a rotating electric machine that can further improve the ease of assembling a bus bar.

In order to solve the above-mentioned problems and achieve the objects, a rotating electrical machine according to the present invention includes a rotor having a field winding and rotatable around a rotation center, and a stator disposed opposite to the rotor. a rotor shaft that rotates integrally with the rotor around the rotation center; a shaft portion coupled to one end of the rotor shaft; a flange portion provided with a through hole penetrating in the axial direction of the sub-shaft; a slip ring fixed to the outer circumferential surface of the shaft portion; and a sub-shaft located between the slip ring and the shaft portion. a first portion extending along the outer circumferential surface of the shaft portion and inserted into the through hole; and a bent portion located on the opposite side of the flange portion from the first portion to the slip ring in the axial direction. and a second portion extending outward in the radial direction, and a bus bar electrically connecting the slip ring and the field winding.

According to the present invention, since the bent portion is provided on the opposite side of the flange portion from the slip ring, for example, compared to a case where the bent portion is provided on the slip ring side of the flange portion, the bus bar penetrates more easily. The holes can be placed closer to the shaft portion. Thereby, it is possible to suppress misalignment between the bus bar and the through hole or the slip ring, and in turn, it is possible to further improve the ease of assembling the bus bar. Further, for example, by providing the through hole closer to the shaft portion, the diameter of the flange portion can be configured to be smaller. Thereby, the diameter of the seal member that can be provided on the outer circumferential surface of the flange portion can be made smaller, and as a result, loss due to sliding resistance of the seal member can be reduced.

FIG. 1 is an exemplary and schematic cross-sectional view of a rotating electric machine according to an embodiment. FIG. 2 is an exemplary and schematic plan view of the rotating electrical machine of the embodiment. FIG. 3 is an exemplary and schematic cross-sectional view of a portion of a modified rotating electric machine.

Exemplary embodiments of the invention are disclosed below. The configuration of the embodiment shown below and the effects and effects brought about by the configuration are merely examples. The present invention can be realized by configurations other than those disclosed in the following embodiments.

Furthermore, the embodiments and modifications disclosed below include similar components. Therefore, in the following description, common reference numerals will be given to those similar components, and redundant explanation will be omitted. Note that in this specification, ordinal numbers are used only to distinguish parts, members, regions, positions, directions, etc., and do not indicate order or priority.

[Embodiment]
FIG. 1 is a schematic cross-sectional view of a rotating electrical machine 1 according to an embodiment, and FIG. 2 is a schematic plan view of the rotating electrical machine 1. In the following description, for convenience, the axial direction of the rotation center Ax of the rotating electric machine 1 is simply referred to as the axial direction, the radial direction of the rotation center Ax is simply referred to as the radial direction, and the circumferential direction of the rotation center Ac is simply referred to as the radial direction. It is called the circumferential direction. Further, in the figure, one side in the axial direction is indicated by an arrow X, and the outer side in the radial direction is indicated by an arrow R.

As shown in FIGS. 1 and 2, the rotating electrical machine 1 includes, for example, a rotor 2 having a field winding 11, a stator 3 having an armature winding 12, a rotor shaft 4 that rotates integrally with the rotor 2, and a sub-assembly. It is equipped with a shaft 5. The rotating electrical machine 1 is a synchronous motor having a rotor 2 and a field winding 11 .

The rotor shaft 4 is fixed to the rotor 2 while passing through the inner peripheral portion of the rotor 2 in the axial direction X. Bearings 6 and 7 are provided on the outer circumferential surface 4a of the rotor shaft 4 to support the rotor 2 rotatably around a rotation center Ax with respect to a casing (not shown).

The sub-shaft 5 includes, for example, a shaft portion 5a and a flange portion 5b. The shaft portion 5a is coupled to one end of the rotor shaft 4 in the axial direction by spline fitting or the like. The inner circumferential surface 5e of the shaft portion 5a and the inner circumferential surface 4b of the rotor shaft 4 constitute a flow path through which the cooling liquid and the like flow. The shaft portion 5a is also referred to as a shaft body or the like.

The flange portion 5b projects outward in the radial direction R from the shaft portion 5a. The flange portion 5b is provided with a through hole 5c through which a bus bar 23 (described later) passes through in the axial direction X. Further, a sealing member 8 is provided on the outer circumferential surface of the flange portion 5b to seal a space between the flange portion 5b and a casing (not shown).

The field winding 11 is a winding that rotates integrally with the rotor 2 and generates field magnetic flux. The armature winding 12 is a stator coil wound around a stator core, and generates a rotating magnetic field. Electric power is supplied to the field winding 11 and the armature winding 12 from a power source.

Further, the rotating electric machine 1 is a field winding type rotating electric machine, and further includes a brush, a slip ring 22, a bus bar 23, etc. (not shown). The brush, slip ring 22, and bus bar 23 function as conductive components that electrically connect the power source and the field winding 11.

The slip ring 22 is fixed to the outer circumferential surface 5d of the shaft portion 5a, and rotates together with the subshaft 5 while contacting a brush (not shown).

Specifically, the slip ring 22 includes a first slip ring 22A and a second slip ring 22B. The first slip ring 22A rotates while contacting a first brush (not shown), and the second slip ring 22B rotates while contacting a second brush (not shown).

The bus bar 23 is a component that electrically connects the slip ring 22 and the field winding 11. In this embodiment, the bus bar 23 includes a first bus bar 23A and a second bus bar 23B. The first bus bar 23A electrically connects the first slip ring 22A and the field winding 11, and the second bus bar 23B electrically connects the second slip ring 22B and the field winding 11.

Further, the first bus bar 23A and the second bus bar 23B are respectively located at a first portion 23a extending in the axial direction X, a second portion 23b extending in the radial direction R, and between the first portion 23a and the second portion 23b. It has a bent portion 23c.

The first portion 23 a is a portion connected to the slip ring 22 and constitutes one end of the bus bar 23 . In this embodiment, the first portion 23a is located between the slip ring 22 and the shaft portion 5a, extends along the outer peripheral surface 5d of the shaft portion 5a, and is inserted into the through hole 5c.

The second portion 23 b is a portion connected to the field winding 11 and constitutes the other end of the bus bar 23 . In this embodiment, the second portion 23b is inserted into the notch 4c (see FIG. 2) of the rotor shaft 4, and extends along the radial direction R inside the notch 4c.

The bent portion 23c is a portion that connects the first portion 23a and the second portion 23b, and constitutes an intermediate portion of the bus bar 23. In this embodiment, the bent portion 23c is located on the opposite side of the flange portion 5b from the slip ring 22 in the axial direction It has been inserted.

As described above, in the present embodiment, the rotating electric machine 1 includes the first portion 23a, which is located between the slip ring 22 and the shaft portion 5a, extends along the outer peripheral surface 5d of the shaft portion 5a, and is inserted into the through hole 5c. and a second portion 23b extending outward in the radial direction R from the first portion 23a through a bent portion 23c located on the opposite side of the slip ring 22 of the flange portion 5b in the axial direction X. A bus bar 23 is provided to electrically connect the ring 22 and the field winding 11.

According to such a configuration, since the bent portion 23c is provided on the side of the flange portion 5b opposite to the slip ring 22, for example, the bent portion 23c is provided on the slip ring 22 side of the flange portion 5b. In comparison, the through hole 5c through which the bus bar 23 passes can be provided closer to the shaft portion 5a. Thereby, it is possible to suppress misalignment between the bus bar 23 and the through hole 5c or the slip ring 22, and as a result, the ease of assembling the bus bar 23 can be further improved. Further, for example, by providing the through hole 5c closer to the shaft portion 5a, the diameter of the flange portion 5b can be configured to be smaller. Thereby, the diameter of the seal member 8 that can be provided on the outer peripheral surface of the flange portion 5b can be made smaller, and the loss due to the sliding resistance of the seal member 8 can be reduced.

Further, for example, compared to the case where the bent portion 23c is provided on the slip ring 22 side of the flange portion 5b, the shape of the bus bar 23 can be more simply configured, and the joint strength of the bus bar 23 can be more stabilized. There are also advantages in that the centrifugal stress on the rotor shaft 4 is further reduced, the assembly and molding of the bus bar 23 is facilitated, and the notch 4c of the rotor shaft 4 into which the bus bar 23 is inserted is easily machined. .

[Modified example]
FIG. 3 is a schematic cross-sectional view of a portion of a modified rotating electrical machine 1A. The rotating electrical machine 1A has the same configuration as the rotating electrical machine 1 of the above embodiment. Therefore, the rotating electric machine 1A can obtain the same operation and effect as the above embodiment based on the same configuration.

However, this modified example is different from the above embodiment in that the bus bar 23 is provided with a plurality of bent portions 23c, as shown in FIG. Specifically, in this modification, the bus bar 23 is provided with three bent portions 23c between the first portion 23a and the second portion 23b.

In this modification, the three bent portions 23c provide a stepped portion 23d on the opposite side of the flange portion 5b from the slip ring 22 in the axial direction X to ensure an insulation distance or the like.

In this manner, also in this modification, since the plurality of bent portions 23c are provided on the opposite side of the flange portion 5b from the slip ring 22, misalignment between the bus bar 23 and the through hole 5c and the slip ring 22 is suppressed. Therefore, the ease of assembling the bus bar 23 can be further improved.

Although the embodiments and modified examples of the present invention have been illustrated above, the embodiments and modified examples described above are merely examples, and are not intended to limit the scope of the invention. The embodiments and modifications described above can be implemented in various other forms, and various omissions, substitutions, combinations, and changes can be made without departing from the gist of the invention. In addition, specifications such as each configuration, shape, etc. (structure, type, direction, format, size, length, width, thickness, height, number, arrangement, position, material, etc.) may be changed as appropriate. It can be implemented by

1...Rotating electric machine 2...Rotor 3...Stator 4...Rotor shaft 5...Subshaft 5a...Shaft part 5b...Flange part 5c...Through hole 5d...Outer peripheral surface 11...Field winding 22...Slip ring 23...Bus bar 23a...No. Part 23b... Second part 23c... Bent part Ax... Center of rotation R... Radial direction X... Axial direction

Claims (1)

a rotor having a field winding and rotatable around a rotation center;
a stator disposed opposite the rotor;
a rotor shaft that rotates around the rotation center integrally with the rotor;
The rotor shaft has a shaft portion that is coupled to one end of the rotor shaft, and a flange portion that is provided with a through hole that protrudes outward from the shaft portion in the radial direction of the rotation center and penetrates in the axial direction of the rotation center. with a sub-shaft,
a slip ring fixed to the outer peripheral surface of the shaft portion;
a first portion located between the slip ring and the shaft portion, extending along the outer peripheral surface of the shaft portion, and inserted into the through hole; and the slip ring of the flange portion in the axial direction from the first portion. a second portion extending outward in the radial direction via a bent portion located on the opposite side of the bus bar, the bus bar electrically connecting the slip ring and the field winding;
A rotating electrical machine equipped with

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