JP2009050055A - Rotor of rotary electric machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rotor of a rotary electric machine capable of reducing a manufacturing cost and preventing erroneous detection of a rotor angle in abnormal operation. <P>SOLUTION: The rotor of the rotary electric machine is provided with: a shaft 19, a flange 21 fixed on the shaft 19, a rotor core 22 as an iron core supported by the flange 21 and having a coil or a magnet provided thereon, and a rotor 23 for resolver for detecting the angle of the rotor. The shaft 19 and the flange 21 are differently formed, and the rotor 23 for resolver is attached to the flange 21. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a rotor of a rotating electrical machine.

  FIG. 5 is a cross-sectional view of a rotor 10 of a conventional rotating electrical machine. As shown in FIG. 5, the rotor 10 detects a shaft 11, a flange 12 fixed to the shaft 11, a rotor core 13 that is supported by the flange 12 and is an iron core provided with a coil and a magnet, and a rotor angle. And a resolver 14. In FIG. 5, the flange 12 is formed integrally with the shaft 11 (see, for example, Patent Document 1). In this case, there is a problem that the casting mold for integrally forming the shaft 11 and the flange 12 is enlarged, and the manufacturing cost is high.

  Therefore, as shown in FIG. 6, it is conceivable to separate the shaft 11 and the flange 12. If it does in this way, it can suppress that the type | mold for casting enlarges. As shown in FIG. 6, the shaft 11 is fitted with the flange 12, and the resolver 14 is attached to the shaft 11.

JP 2005-318679 A

  In the configuration of FIG. 6, for example, when the rotational speed of the rotor exceeds the allowable rotational speed, the centrifugal force acting on the flange 12 becomes larger than that during normal operation, and the force for expanding the flange 12 in the radial direction becomes large. Then, the fitting between the shaft 11 and the flange 12 is weakened, and the flange 12 fixed to the shaft 11 may be displaced in the circumferential direction of the shaft 11. In this case, since the positional relationship between the rotor core 13 attached to the flange 12 and the resolver 14 attached to the shaft 11 is also shifted, there is a problem that the rotor angle cannot be detected accurately. It was.

  The present invention includes a shaft, a rotor core support member fixed to the shaft, a rotor core that is supported by the rotor core support member and provided with a coil or a magnet, and a rotor angle detector for detecting the angle of the rotor, In the rotor of the rotating electrical machine including the shaft and the rotor core support member are configured separately, and the rotor angle detector is attached to the rotor core support member. According to such a configuration, it is possible to reduce the manufacturing cost of the rotor and to prevent erroneous detection of the rotor angle during abnormal operation of the rotor.

In the rotor of the rotating electrical machine according to the present invention, the rotor core support member includes a cylindrical shaft insertion portion into which the shaft is inserted, and the shaft insertion portion has an inner circumferential surface spaced from the outer circumferential surface of the shaft. The opposing cylindrical first part and the cylindrical second part whose inner peripheral surface is in close contact with the outer peripheral surface of the shaft are continuous along the axial direction of the shaft,
The rotor angle detector is preferably attached on the outer peripheral surface of the first portion. According to this configuration, for example, when the shaft is shrink-fitted into the shaft insertion portion, it is possible to suppress the occurrence of distortion in the first portion of the shaft insertion portion. Thereby, it can suppress that a shift | offset | difference generate | occur | produces in the positional relationship of the rotor angle detection body attached on the outer peripheral surface of a 1st part, and a rotor core.

  In the rotor of the rotating electrical machine according to the present invention, the rotor core support member is arranged such that an inner peripheral surface thereof is opposed to the outer peripheral surface of the shaft insertion portion with a space therebetween, and the rotor core is attached to the outer peripheral surface. An integral structure further including a rotor-shaped rotor core mounting portion and a connecting portion that extends from the outer peripheral surface of the shaft insertion portion toward the inner peripheral surface of the rotor core mounting portion and connects the shaft insertion portion and the rotor core mounting portion. It is preferable that it is a member.

  According to the present invention, it is possible to reduce the manufacturing cost of the rotor and to prevent erroneous detection of the rotor angle during abnormal operation.

(Constitution)
Hereinafter, modes for carrying out the present invention (hereinafter referred to as embodiments) will be described with reference to the drawings. FIG. 1 is a cross-sectional view illustrating a schematic configuration of an electric motor 15 according to the present embodiment. The electric motor 15 includes a case 16, a rotor 17 that is a rotating portion, and a stator 18 around which a three-phase coil is wound. The stator 18 is fixed to the case 16. A shaft 19 that is a rotating shaft of the rotor 17 is supported by a bearing 20 fixed to the case 16.

  FIG. 2 is a cross-sectional view of the rotor 17 that is a rotating portion of the electric motor 15 according to the present embodiment. The rotor 17 includes a hollow shaft 19 that is a rotating shaft, a flange 21 that is fixed to the shaft 19, a rotor core 22 that is an iron core supported by the flange 21, and a resolver rotor 23 that detects the rotor angle. . In the present embodiment, the hollow shaft 19 is used for weight reduction. However, the present invention is not limited to this, and for example, the shaft may have a solid shape.

  The flange 21 is an integral member including a cylindrical shaft insertion portion 24 into which the shaft 19 is inserted, a cylindrical rotor core mounting portion 25, and a connecting portion 26. The rotor core mounting portion 25 is disposed such that the inner peripheral surface thereof is opposed to the outer peripheral surface of the shaft insertion portion 24 with a space therebetween, and the rotor core 22 is mounted on the outer peripheral surface. The connecting portion 26 extends from the outer peripheral surface of the shaft insertion portion 24 so as to protrude toward the inner peripheral surface of the rotor core attachment portion 25, and connects the shaft insertion portion 24 and the rotor core attachment portion 25.

  The rotor core 22 is configured by laminating a plurality of thin donut-shaped steel plates 27. The inner peripheral surface of the laminate is attached to the outer peripheral surface of the rotor core attachment portion 25 of the flange 21. The rotor core 22 is provided with a slot penetrating the rotor core 22 in the stacking direction of the steel plates 27, and a permanent magnet 28 is inserted into the slot. At both ends of the rotor core 22 in the stacking direction, holding plates 29a and 29b for holding the permanent magnet 28 are provided. In the present embodiment, the permanent magnet 28 is inserted into the slot of the rotor core 22, but the present invention is not limited thereto, and for example, a coil can be inserted into the slot.

  The resolver rotor 23 is mounted on the outer peripheral surface of the shaft insertion portion 24 of the flange 21. As shown in FIG. 1, a resolver stator 30 is fixed to the case 16. The resolver stator 30 is provided with an excitation coil and an output coil. FIG. 3 is a cross-sectional view of the resolver rotor 23 and the resolver stator 30 as viewed from the axial direction of the shaft 19. When the resolver rotor 23 rotates with a measurement signal output to the excitation coil, a signal corresponding to the rotational angle θ of the resolver rotor 23 at that time is output from the output coil. Based on this output signal, the rotation angle of the resolver rotor 23 can be detected. This configuration is the same as that of a conventionally known resolver.

  FIG. 4 is an enlarged cross-sectional view of a part of the fitting portion between the shaft 19 and the shaft insertion portion 24. As shown in FIG. 4, the shaft insertion portion 24 has a cylindrical first portion 31 whose inner peripheral surface is opposed to the outer peripheral surface of the shaft 19 with an interval t, and its inner peripheral surface is the outer peripheral surface of the shaft 19. The cylindrical second portion 32 that is in close contact with the shaft is continuous along the axial direction of the shaft 19. A resolver rotor 23 is attached to the outer peripheral surface of the first portion 31.

(Action / Effect)
In the present embodiment, the flange 21 that is a rotor core support member is configured separately from the shaft 19, and a resolver rotor 23 that is a rotor angle detector is attached to the flange 21. According to this configuration, since the shaft 19 and the flange 21 are separate bodies, it is possible to suppress an increase in the size of the casting mold, and it is possible to suppress an increase in the manufacturing cost of the rotor 17. Further, for example, even when the rotational speed of the rotor 17 is increased and the flange 21 is displaced in the circumferential direction of the shaft 19, it is possible to prevent the positional relationship between the resolver rotor 23 and the rotor core 22 from being displaced. Thereby, it is possible to prevent erroneous detection of the rotor angle during abnormal operation of the rotor 17.

  In the present embodiment, when the shaft 19 is fitted in the shaft insertion portion 24 of the flange 21, the inner peripheral surface of the first portion 31 of the shaft insertion portion 24 is opposed to the outer peripheral surface of the shaft 19 with a gap. The inner peripheral surface of the second portion 32 is in close contact with the outer peripheral surface of the shaft 19. According to this configuration, for example, when the shaft 19 is shrink-fitted into the shaft insertion portion 24, the first portion 31 of the shaft insertion portion 24 is not affected by the stress from the shaft 19, and the first portion 31 of the shaft insertion portion 24 is not affected. It can suppress that distortion generate | occur | produces in the 1 part 31. FIG. Thereby, it is possible to suppress the occurrence of deviation in the positional relationship between the resolver rotor 23 attached on the outer peripheral surface of the first portion 31 and the rotor core 22.

  In the present embodiment, the rotor angle detector attached to the flange 21 is the resolver rotor 23, but is not limited thereto, and may be any one for detecting the rotor angle. For example, a rotary encoder rotor may be attached to the flange 21.

  As mentioned above, although the form for implementing this invention was demonstrated, this invention is not limited to such embodiment at all, It can implement in the range which does not deviate from the summary of this invention. The electric motor according to the present embodiment can be used as a drive source for a hybrid vehicle or an electric vehicle, for example. Moreover, although the example of the electric motor has been mainly described in the present embodiment, the present invention is not limited thereto, and the present invention can also be applied to a rotor of a generator.

It is sectional drawing which shows schematic structure of the electric motor which concerns on this embodiment. It is sectional drawing of the rotor which concerns on this embodiment. It is sectional drawing which looked at the resolver which concerns on this embodiment from the axial direction of the shaft. It is sectional drawing to which a part of fitting part of a shaft and a shaft insertion part was expanded. It is sectional drawing of the rotor of the conventional rotary electric machine. It is sectional drawing of the rotor of the conventional rotary electric machine.

Explanation of symbols

  10 rotor, 11 shaft, 12 flange, 13 rotor core, 14 resolver, 15 motor, 16 case, 17 rotor, 18 stator, 19 shaft, 20 bearing, 21 flange, 22 rotor core, 23 resolver rotor, 24 shaft insertion portion, 25 Rotor core attaching part, 26 connecting part, 27 steel plate, 28 permanent magnet, 29 holding plate, 30 resolver stator, 31 first part, 32 second part.

Claims (3)

A shaft,
A rotor core support member fixed to the shaft;
A rotor core that is an iron core supported by the rotor core support member and provided with a coil or a magnet;
In a rotor of a rotating electrical machine comprising a rotor angle detector for detecting the rotor angle,
The shaft and the rotor core support member are configured separately.
The rotor of the rotating electrical machine, wherein the rotor angle detector is attached to the rotor core support member. The rotor of the rotating electrical machine according to claim 1,
The rotor core support member includes a cylindrical shaft insertion portion into which the shaft is inserted,
The shaft insertion portion has a cylindrical first portion whose inner peripheral surface is opposed to the outer peripheral surface of the shaft with a space therebetween, and a cylindrical second portion whose inner peripheral surface is in close contact with the outer peripheral surface of the shaft. And is a shape that continues along the axial direction of the shaft,
The rotor of a rotating electrical machine, wherein the rotor angle detector is mounted on an outer peripheral surface of the first portion. In the rotor of the rotating electrical machine according to claim 2,
The rotor core support member is
A cylindrical rotor core mounting portion, the inner peripheral surface of which is arranged so as to face the outer peripheral surface of the shaft insertion portion with a space therebetween, and the rotor core is mounted on the outer peripheral surface;
It is an integral member that further includes a connecting portion that extends from the outer peripheral surface of the shaft insertion portion toward the inner peripheral surface of the rotor core attachment portion and connects the shaft insertion portion and the rotor core attachment portion. A rotor of a rotating electrical machine characterized by that.

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