JP2005117736A - Rotary electric machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To shorten the entire length of a rotary electric machine and to enable a connector to be attached from outside the rotary electric machine. <P>SOLUTION: A housing 2 and a frame 3 are engaged with each other. A stator 4 is fixed to the frame 3, and a rotor 15 is pivoted inside the stator 4. A resolver 19 is fitted by installing a rotor 24 for the resolver on the rotor 15 while fixing a stator 26 for the resolver to the housing 2. An opening of a sensor connector 21 fitted to the resolver 19 is arranged to look at the outside of a motor 1. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a rotating electrical machine having a resolver, and more particularly to an attachment structure for attaching a resolver to a DC brushless motor.

  In a conventional direct current (DC) brushless motor, a VR (variable reluctance) resolver connector, which is a rotational position sensor for detecting the rotational position of the rotor, is located inside the motor and is electrically attached to an ECU outside the motor by a lead wire. (For example, refer to Patent Document 1).

JP 2001-78393 A (FIG. 1)

  Since a conventional DC brushless motor having a resolver is configured as described above, the connection between the resolver and the lead wire is made inside the motor, and a space for the connector and the lead wire is required. As a result, the shaft length of the steel plate becomes long, making it difficult to assemble.

  The present invention has been made to solve the above-described problems, and makes it possible to shorten the overall length of the motor and facilitate the assembly by allowing the connector to be attached from the outside of the motor. An object of the present invention is to provide a DC brushless motor equipped with a resolver capable.

  According to a first aspect of the present invention, there is provided a rotating electrical machine in which a stator is fixed to a frame fitted in a housing, a rotor is rotatably supported in the stator, a resolver rotor is installed in the rotor, and the housing In this, the resolver is fixed by fixing the resolver stator, and the opening of the connector attached to the resolver is arranged facing the outside of the rotating electrical machine.

  According to the first aspect of the present invention, the stator is fixed to the frame fitted in the housing, the rotor is rotatably supported in the stator, and the resolver rotor is installed in the rotor. In addition, the resolver is fixed to the housing by fixing the resolver stator, and the opening of the connector attached to the resolver is arranged toward the outside of the rotating electrical machine, so that the entire length of the rotating electrical machine can be shortened. The connector can be easily attached.

Embodiment 1 FIG.
1 is a front view showing a DC brushless motor including a resolver according to Embodiment 1 of the present invention, and FIG. 2 is a side sectional view.
Here, the resolver is a rotation angle sensor composed of only windings, and is theoretically equivalent to a transformer. The structural difference from the transformer is that the iron core is divided into a rotor and a stator.
The stator is provided with an excitation coil, and the rotor is provided with a detection coil and a rotary transformer. This applies the fact that the phase difference of the output voltage with respect to the excitation voltage is proportional to the rotation angle.
The phase angle of the phase output voltage with respect to the excitation voltage is the shaft angle.

  1 and 2, a housing 2 and a frame 3 constituting the DC brushless motor 1 are fitted to each other, and a stator 4 is fixed to the frame 3. A motor coil 6 is wound around the stator 4 via an insulator 5 for insulation. The holder 7 is fixed to the insulator 5 by a snap fit, and the terminal 8 and the motor coil 6 provided in the holder 7 are connected by fusing (dissolving).

A nut 10 is provided in a base 9 provided adjacent to the holder 7, and a terminal 11 is fixed next to the nut 10.
The terminal 8 and the terminal 11 are connected by TIG welding. The terminal 11 and the terminal 12 are connected by being sandwiched from both sides by a nut 10 and a screw 13 provided in the base 9, and the terminal 12 is connected to the motor lead. Connected to line 14.

The rotor 15 is held by a rear bearing 16 provided at the end of the frame 3 and is held by a front bearing 17 fixed to the housing 2 by caulking.
A magnet (ring magnet) 18 is attached to the rotor 15.

3 is a front view showing the resolver 19 installed in the DC brushless motor, FIG. 4 is a side view of the resolver 19, and the resolver 19 is provided with a male connector 20.
In FIG. 2, the part indicated by diagonal lines is the resolver 19. A sensor connector 21 is fitted to the male connector 20, and a sensor lead wire 22 is connected to the sensor connector 21.

A resolver rotor 24 and a boss 25 are press-fitted into the rotor 15 via a bush 23.
In the present embodiment, as shown in FIG. 2, the openings of the connectors 20 and 21 are arranged facing the outside (the boss 25 side) of the motor 1.
A resolver stator portion 26 fixed to the housing 2 is provided on the outer periphery of the resolver rotor 24, and the sensor lead wire 22 is fixed by a clamp 28 inside the housing inlay 27.
In FIG. 2, the gear 29 is fitted in the housing inlay 27 portion so that the connectors 20 and 21 and the sensor lead wire 22 can be accommodated in the space portion A of the gear-side housing, as indicated by a one-dot chain line.
The sensor lead wire 22 may be joined to the resolver 19 by caulking, welding, or the like.

FIG. 5 is a side sectional view showing an example in which the sensor connector 21 and the sensor lead wire 22 are arranged inside the motor 1 unlike the present invention. With this configuration, the space between the connectors 20 and 21 and the sensor lead wire 22 is reduced. Since it is required inside the motor 1, the shaft length of the motor 1 becomes long, and it becomes complicated even when assembled.
On the other hand, according to the present invention, the connectors 20 and 21 and the sensor lead wire 22 are not provided inside the motor 1, but the connectors 20, 21 and the sensor lead wire 22 are accommodated in the space A of the gear 29 side housing. The overall length of the motor 1 can be shortened.

Further, according to the present invention, since the connectors 20 and 21 can be attached from the outside of the motor 1, the assembly can be easily performed.
Furthermore, since the sensor lead wire 22 can be pulled out of the motor 1, there is no short circuit with the terminals 8, 11, 12 provided inside the motor 1.
Further, since the clamp 28 is attached to the outside of the motor 1, the clamp 28 is not released and does not fall into the motor 1.

Embodiment 2. FIG.
6 is a front view showing a DC brushless motor according to Embodiment 2 of the present invention, and FIG. 7 is a side sectional view.
In the figure, an electronic control unit (ECU) 31 is directly joined to the housing 2 by screws (not shown), and a terminal 32 and a terminal 11 provided directly on the ECU 31 are connected by screws.
The sensor lead wire 22 is also directly connected to the ECU 31.

In the first embodiment, since the ECU 31 is connected to the ECU 31 through components such as the motor lead wire 14 and a connector (not shown), there is a problem that a space for storing these components is required and work efficiency is poor.
Therefore, in the present embodiment, the work can be easily performed by reducing these parts.

Embodiment 3 FIG.
8 is a front view showing a DC brushless motor according to Embodiment 3 of the present invention, and FIG. 9 is a side sectional view.
In the present embodiment, a part of the housing inlay 27 and a part of the mounting surface for the gear (part B shown by hatching in FIG. 8) are cut out. The motor lead wire 14 and the sensor lead wire 22 are assembled from the front side.
By constructing as described above, since the motor lead wire 14 and the sensor lead wire 22 can be wired using the cutout portion C after the motor 1 is assembled, the work can be easily performed. .

As an application example of the present invention, the DC brushless motor configured as described above can be used as an electric power steering motor (EPS).
In contrast to the hydraulic power steering that uses the hydraulic pressure generated by the oil pump to reduce the steering force, the type of power steering that uses the power of the motor is called electric power steering.

According to the electric power steering motor, the battery is used to rotate the motor so that the steering operation force is reduced only when necessary. Thus, the application range is expanded by applying to the motor for electric power steering.
Further, the resolver mounting structure described above is not limited to the DC brushless motor, and can be applied to any rotating electric machine.

It is a front view which shows the DC brushless motor by Embodiment 1 of this invention. It is side surface sectional drawing which shows the DC brushless motor by Embodiment 1 of this invention. It is a front view which shows a resolver. It is a side view which shows a resolver. It is side surface sectional drawing which shows DC brushless motor. It is a front view which shows the DC brushless motor by Embodiment 2 of this invention. It is side surface sectional drawing which shows the DC brushless motor by Embodiment 2 of this invention. It is a front view which shows the DC brushless motor by Embodiment 3 of this invention. It is side surface sectional drawing which shows the DC brushless motor by Embodiment 3 of this invention.

Explanation of symbols

2 Housing 3 Frame 4 Stator 15 Rotor 19 Resolver 21 Connector 24 Resolver Rotor 26 Resolver Stator 27 Inlay Part 31 Electronic Control Unit

Claims (4)

  A stator is fixed to a frame fitted in a housing, a rotor is rotatably supported in the stator, a resolver rotor is installed in the rotor, and a resolver stator is fixed to the housing. In the rotating electrical machine to which the resolver is attached by the above, the opening of the connector attached to the resolver is arranged facing the outside of the rotating electrical machine.   2. The rotating electrical machine according to claim 1, wherein a notch portion is provided in a part of the inlay portion and the gear mounting surface constituting the housing.   3. The rotating electrical machine according to claim 1, wherein an electronic control unit is joined to the housing.   The rotating electrical machine according to any one of claims 1 to 3, wherein the rotating electrical machine is used as an electric power steering motor.

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