JP2001231218A - Electric rotating machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electric rotating machine which can prevent influence of leakage flux generated between an armature winding and a rotor upon a resolver rotation detector, and facilitate attaching and detaching of the resolver rotation detector. SOLUTION: The resolver rotation detector 9 is arranged outside a bearing 4 which supports an output shaft 1 rotatably and an end bracket 6 holding the bearing 4. The end bracket 6 is so constituted that the leakage flux 11 does not exert influence upon the resolver rotation detector 9.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotating electric machine provided with a resolver rotation detector using a permanent magnet as a rotor,
In particular, it relates to the mounting position of the resolver rotation detector.

[0002]

2. Description of the Related Art In rotary electric machines, those requiring rotation speed control and those requiring control based on rotation direction displacement are generally provided with a resolver rotation detector. Conventionally, a motor provided with a resolver rotation detector is provided with a shield cover made of a separate member on a resolver coil part of the resolver rotation detector, as described in Japanese Patent Application Laid-Open No. 9-65617, for example. It has a structure to prevent the influence of magnetic flux. Further, the resolver rotation detector is arranged inside a plurality of bearings rotatably supporting the output shaft of the motor.

[0003]

SUMMARY OF THE INVENTION The above-mentioned Japanese Patent Laid-Open No. 9-656 is disclosed.
The technology described in Japanese Patent Publication No. 17 is related to a structure in which a resolver rotation detector is mounted inside a plurality of bearings, and a shield cover made of a separate member is mounted so as to cover a resolver coil portion of a resolver stator. No consideration is given to using structural parts of the motor without increasing the number of parts in the structure for shielding the motor.

Further, when a failure such as a disconnection occurs, no consideration is given to replacing the resolver rotation detector, and there is a problem that replacement of the resolver rotation detector cannot be easily performed.

An object of the present invention is to provide a rotating electric machine which can prevent the influence of a leakage magnetic flux generated between an armature winding and a rotor on a resolver rotation detector and can easily attach and detach the resolver rotation detector. Is to do.

[0006]

In order to achieve the above object, a rotating electric machine according to the present invention is characterized in that a bearing for rotatably supporting an output shaft of a resolver rotation detector and holding the bearing. An end bracket is disposed outside the end bracket, and the end bracket is configured so that leakage magnetic flux does not affect the resolver rotation detector.

More specifically, the present invention provides the following rotating electric machines. The present invention provides a rotor having a permanent magnet embedded therein, an output shaft supporting the rotor, bearings rotatably supporting both ends of the output shaft, end brackets respectively holding the bearings, A substantially cylindrical stator frame in which a stator to which the end brackets are respectively held at both ends and armature winding is applied is fixed to an inner peripheral surface; and a resolver which detects a magnetic pole position and a rotational displacement of the rotor. In a rotating electric machine having a rotation detector, the resolver rotation detector is arranged in the axial direction of the bearing and outside the bearing and the end bracket, and the end bracket is configured to rotate the armature winding and the rotation. A rotating electric machine configured to prevent an influence of a leakage magnetic flux generated between the rotor and the resolver on the resolver rotation detector.

Further, the present invention provides a rotor having a permanent magnet embedded therein, an output shaft for supporting the rotor, a bearing for rotatably supporting both ends of the output shaft, and holding the bearing, respectively. An end bracket, a substantially cylindrical stator frame in which a stator provided with armature windings holding the end brackets at both ends thereof is fixed to an inner peripheral surface, and a magnetic pole position and rotation of the rotor. In a rotating electric machine having a resolver rotation detector for detecting displacement, the resolver rotation detector is disposed in the axial direction of the bearing and outside the bearing, and the resolver rotation detector, the rotor, and the electric machine are disposed. There is provided a rotating electric machine characterized in that a partition wall integral with the end bracket is formed between the armature winding and the end winding to block a leakage magnetic flux generated between the armature winding and the rotor.

Preferably, the resolver rotation detector is
The output shaft is disposed axially outside a non-output side bearing that rotatably supports the output shaft at a non-output side end of the output shaft.

[0010] Preferably, the resolver rotation detector is
An output side bearing rotatably supports the output shaft at an output side end of the output shaft and is disposed axially outside.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A rotary electric machine according to an embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is an upper half sectional view of a rotating electric machine according to an embodiment of the present invention. In the present embodiment, a permanent magnet synchronous motor for an electric vehicle having a rotation detector will be described as an example, but the present invention is applicable to a permanent magnet motor having another rotation detector.

A cylindrical rotor 3 is fixed substantially at the center of the output shaft 1 in the axial direction, and a permanent magnet 2 is embedded inside the rotor 3.

Both ends of the output shaft 1 are a pair of bearings, that is, an output bearing 4a located on the output side of the output shaft 1 and a non-output bearing located opposite the output bearing 4a via the rotor 3. 4b, and the output shaft 1 is provided with inner ring sides of an output bearing 4a and a non-output bearing 4b.

The outer ring sides of the output side bearing 4a and the non-output side bearing 4b are held by an output side end bracket 5 and a non-output side end bracket 6, respectively. Accordingly, the rotor 3 and the output shaft 1 are rotatably supported by the output-side bearing 4a and the non-output-side bearing 4b with respect to the output-side end bracket 5 and the non-output-side end bracket 6.

The output-side end bracket 5 and the non-output-side end bracket 6 are respectively fitted to both ends of the stator frame 7 and fastened by bolts or the like (not shown). The stator frame 7 is provided with a shaping portion such as a mount boss for mounting the rotating electric machine on a vehicle.

The stator frame 7 has a substantially cylindrical shape, and a stator 8 is fixed to an inner surface of a substantially central portion of the stator frame 7.

Since the stator 8 is provided with an armature winding, the axial length of the stator 8 is equal to the length of the rotor 3 by the length of the coil end.
Longer than the axial length of Therefore, the output-side end bracket 5 and the non-output-side end, The bracket 6 is formed to be curved inward.

A resolver rotation detector 9 is attached to the curved space of the opposite end bracket 6.
The resolver rotation detector 9 according to the present embodiment can detect both the rotational displacement and the magnetic pole position of the electric motor. The detailed configuration of the resolver rotation detector 9 will be described later with reference to FIG.

The resolver cover 10 is fastened and fixed to the non-output side end bracket 6 by bolts (not shown). The resolver cover 10 is provided for performing maintenance on the resolver rotation detector 9, and can be easily attached to and detached from the non-output side end bracket 6.

The joint surface between the resolver cover 10 and the non-output side end bracket 6 is fastened and fixed via a sealing agent or the like for waterproofing and dustproofing.

Next, the mounting structure of the resolver rotation detector 9 will be described with reference to FIG.

FIG. 2 is a partially enlarged upper half sectional view of the resolver rotation detector 9 attached to the rotating electric machine of FIG.

As shown in FIG. 2, the resolver rotation detector 9
Is attached to a space formed by curving the non-output side end bracket 6 inward. The resolver rotation detector 9 has a structure that can be easily removed from the rotating electric machine main body for maintenance.

A stepped curved portion 6 formed in a cavity formed by curving the non-output side end bracket 6 toward a cavity caused by a difference between the axial length of the stator 8 and the axial length of the rotor 3.
A resolver stator 9b having a cylindrical resolver coil 9a is mounted inside a.

A resolver rotor 9c is mounted on the outer periphery of the rear end of the output shaft 1 opposite to the output side so as to face the resolver stator 9b, and the resolver rotor 9c rotates with the rotation of the output shaft 1.

Resolver stator 9b and resolver rotor 9
c, and the resolver rotation detector 9 having the
b.

With the above structure, the resolver rotation detector 9 is magnetically separated from the rotor 3 and the stator 8 by the partition and the bearing 4b formed integrally with the end bracket 6 opposite to the output side. can do. Thereby, the leakage magnetic flux 11 generated between the armature winding of the stator 8 and the rotor 3 can be minimized from reaching the resolver coil 9a, and the rotation of the resolver rotor 9c causes the resolver stator 9b to rotate. To prevent the leakage magnetic flux 11 from entering the magnetic field generated between them.

As a result, the change in the waveform signal output from the resolver rotation detector 9 can be suppressed, and the rotation detection accuracy can be improved.

The resolver rotation detector 9 has a mounting structure that can be easily replaced by removing the resolver cover 10. When the resolver cover 10 is removed, the resolver rotation detector 9 is exposed, and the work of replacing the resolver rotation detector 9 can be easily performed in this state, so that the maintainability can be improved.

FIG. 3 is a top half sectional view of a rotating electric machine according to another embodiment of the present invention.
FIG. 7 is an upper half sectional view of the non-output side end bracket 6 arranged outside an inner end face 6c.

In this embodiment, the resolver rotation detector 9 is shifted rearward of the output shaft 1 on the opposite side of the output shaft 1 with respect to the embodiment of FIG. It is a thing kept away.

By mounting the resolver stator 9b of the resolver rotation detector 9 at a position outside the joint surface 6b between the stator frame 7 and the non-output side end bracket 6, the armature winding of the stator 8 and the rotation It is possible to further suppress the leakage magnetic flux 11 generated with the child 3 from reaching the resolver coil 9a, and further improve the rotation detection accuracy by further reducing the influence of the leakage magnetic flux 11 on the resolver rotation detector 9. be able to.

FIG. 4 is an upper half sectional view of a rotating electric machine according to still another embodiment of the present invention, in which a resolver rotation detector is disposed further outside the inner end face 6c on the opposite side of the output-side end bracket. It is sectional drawing.

In the present embodiment, the non-output side bearing 4b is disposed outside the joint surface 6b between the stator frame 7 and the non-output side end bracket 6, so that the resolver rotation detector 9 is provided. , And is further mounted on the rear side on the opposite side of the output side, and is further away from the rotor 3 and the stator 8.

With this configuration, the resolver rotation detector 9 is disposed at a position where the path of the leakage magnetic flux 11 generated between the armature winding of the stator 8 and the rotor 3 is avoided. Leakage magnetic flux 11 reaching 9a can be almost completely prevented, and resolver rotation detector 9 can perform high-precision rotation detection unaffected by leakage magnetic flux 11.

FIG. 5 is a top half sectional view of a rotating electric machine according to still another embodiment of the present invention, in which a resolver rotation detector is attached to the output side of the output shaft 1.

The resolver rotation detector 9 is attached to a space inside the end face of the output end bracket 5. A resolver stator 9b having a cylindrical resolver coil 9a is mounted inside a stepped curved portion 5a formed in a space at the front end formed by bending the output side end bracket 5.

A resolver rotor 9c is attached to the outer periphery of the output side front end of the output shaft 1 so as to face the resolver stator 9b, and the resolver rotor 9c rotates with the rotation of the output shaft 1.

The resolver stator 9b and the resolver rotor 9
c, the resolver rotation detector 9 having the output side bearing 4a
Mounted on the outside.

With the above structure, the resolver rotation detector 9 is magnetically separated from the rotor 3 and the stator 8 by the partition and the output bearing 4a formed integrally with the output end bracket 5. Can be.

As described above, the resolver rotation detector 9
Is magnetically separated from the rotor 3 and the stator 8 by the partition walls, so that the leakage magnetic flux 11 generated between the armature winding of the stator 8 and the rotor 3 reaches the resolver coil 9a. As much as possible, the leakage flux 1 on the motor side
1 can be prevented from affecting the resolver rotation detector 9.

As a result, the change in the waveform signal output from the resolver rotation detector 9 can be suppressed, and the rotation detection accuracy can be improved.

Further, the resolver cover 10 can be eliminated, and the number of parts can be reduced.

[0045]

According to the present invention, by disposing the resolver rotation detector outside the bearing and the end bracket, the leakage magnetic flux generated between the armature winding and the rotor can be detected by the resolver rotation detector. Can be prevented, and the rotation detection accuracy of the resolver rotation detector can be improved. In addition, since the resolver rotation detector can be easily attached and detached, the maintainability can be improved.

[Brief description of the drawings]

FIG. 1 is a top half sectional view of a rotating electric machine according to an embodiment of the present invention.

FIG. 2 is a partially enlarged upper half sectional view of a resolver rotation detector attached to the rotating electric machine of FIG. 1;

FIG. 3 is an upper half sectional view of a rotating electric machine according to another embodiment of the present invention.

FIG. 4 is an upper half sectional view of a rotating electric machine according to still another embodiment of the present invention.

FIG. 5 is an upper half sectional view of a rotating electric machine according to still another embodiment of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Output shaft, 2 ... Permanent magnet, 3 ... Rotor, 4a ... Output side bearing, 4b ... Non-output side bearing, 5 ... Output side end bracket, 5a ... Stepped curved part, 6 ... Non-output side end bracket, 6a: stepped curved portion, 6b: joining surface, 6c: inner end surface, 7: stator frame, 8: stator, 9: resolver rotation detector, 9a: resolver coil, 9b: resolver stator, 9c: resolver rotor, 10. Resolver cover,
11 ... Leakage flux

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Osamu Koizumi 2520 No. Odaiba, Hitachinaka-shi, Ibaraki F-term in the Automotive Equipment Group of Hitachi, Ltd. (Reference) 5H611 AA01 PP01 PP07 QQ02 QQ03 UA04 UA08 UB01

Claims (4)

[Claims] 1. A rotor having a permanent magnet embedded therein, an output shaft supporting the rotor, bearings rotatably supporting both ends of the output shaft, and end brackets respectively holding the bearings. A substantially cylindrical stator frame in which the end brackets are held at both ends and a stator on which armature winding is applied is fixed to an inner peripheral surface, and a magnetic pole position and a rotational displacement of the rotor are detected. In a rotating electric machine having a resolver rotation detector, the resolver rotation detector is disposed in the axial direction of the bearing, and outside the bearing and the end bracket,
The rotating electric machine, wherein the end bracket is configured to prevent an influence of a leakage magnetic flux generated between the armature winding and the rotor on the resolver rotation detector. 2. A rotor having a permanent magnet embedded therein, an output shaft supporting the rotor, bearings rotatably supporting both ends of the output shaft, and end brackets respectively holding the bearings. A substantially cylindrical stator frame in which the end brackets are respectively held at both ends and a stator on which armature winding is applied is fixed to an inner peripheral surface, and a magnetic pole position and a rotational displacement of the rotor are detected. In a rotary electric machine having a resolver rotation detector, the resolver rotation detector is disposed in the axial direction of the bearing and outside the bearing, and the resolver rotation detector, the rotor, and the armature winding are disposed. A rotating electric machine characterized in that a partition wall integral with the end bracket is formed between the end brackets to block leakage magnetic flux generated between the armature winding and the rotor. 3. The non-output side bearing according to claim 1 or 2, wherein the resolver rotation detector is provided at the non-output side end of the output shaft in an axial direction of a non-output side bearing rotatably supporting the output shaft. A rotating electric machine characterized by being arranged. 4. The resolver rotation detector according to claim 1, wherein the resolver rotation detector is disposed at an output side end of the output shaft outside an output side bearing rotatably supporting the output shaft. A rotating electric machine characterized by the above-mentioned.