JP2011234513A - Control unit-integrated rotary electric machine - Google Patents

Abstract

An object of the present invention is to improve the detection accuracy of a rotor position detection sensor of a controller-integrated rotating electrical machine.
A stator 10, a rotor 8 fixed to a rotating shaft 7, a front bearing 5 and a rear bearing 6 that support the rotating shaft 7 on both sides of the rotor 8, and a stator 10 are held, and the rotor 8 is fixed. From the motor unit 1 including the housing 4 held via the bearings 5 and 6, the power circuit unit 18, the control circuit unit 19, and the sensor rotor 30 and the sensor stator 23 for detecting the rotation angle of the rotor 8. And a rotor position detection sensor 14. A cylindrical portion 4 a extending in the axial direction from the central portion of the axial wall portion of the housing 4 is provided. A rear bearing 6 is provided in the cylindrical portion 4 a. The sensor rotor 30 is attached to the rear side end of the sensor stator 23. The sensor stator 23 is directly inside the cylindrical portion 4a so that the outer peripheral surface of the sensor rotor 30 and the inner peripheral surface of the sensor stator 23 face each other. It has been written order.
[Selection] Figure 1

Description

  The present invention relates to a controller-integrated rotating electrical machine, and more particularly, to improve detection angle accuracy by improving positioning accuracy of a rotor position detection sensor.

  As a structure of a conventional general controller-integrated rotating electrical machine, a motor unit including a rotor and a stator, and a housing (bracket) that holds the stator and holds the rotor through a bearing ( Rotating electrical machine main body), power circuit unit that performs switching control of current supplied to the stator coil of the stator, control board having a control circuit that controls the power circuit unit, and detecting the rotational speed and rotational position of the rotor of the motor unit A rotor position detection sensor, a control board, and a resin case portion that holds a sensor stator of the rotor position detection sensor. The rotor position detection sensor has a ring-shaped rotor sensor and a ring-shaped sensor stator facing the outer peripheral surface of the rotor sensor, and the rotor sensor of the rotor position detection sensor is attached to the end of the rotating shaft of the rotor. It has been.

  The resin case portion has a cylindrical first fitting protrusion at the center thereof, and a sensor stator is fitted on the inner periphery of the first fitting protrusion. The housing is provided with a cylindrical second fitting protrusion, the bearing is fixed to the inner periphery of the second fitting protrusion, the rotation shaft is supported by the bearing, and the rotor sensor is provided at the end of the rotation shaft. It is attached. The outer periphery of the first fitting protrusion is fitted into the inner periphery of a cylindrical second fitting protrusion provided on the motor part housing, and is fixed to the motor part housing. (For example, see Patent Document 1)

Japanese Patent No. 4407968 (page 3, FIG. 1)

  In the conventional controller-integrated rotating electrical machine as in Patent Document 1, the sensor stator is fitted into the cylindrical first fitting projection of the resin case portion, and the first fitting projection is provided on the housing. Since the relative position between the sensor stator and the sensor rotor is determined by fitting into the second fitting protrusion, the relative position of the sensor stator and the sensor rotor in the axial direction may be shifted, or the first fitting protrusion. Further, there is a problem in that the relative accuracy between the center axis of the sensor stator and the center axis of the sensor rotor is caused by the processing accuracy of both the second fitting protrusions and the detection angle accuracy is lowered.

  The present invention has been made to solve the above-described problems, and aims to improve the positioning accuracy of the rotor position detection sensor and improve the detection accuracy of the detection angle.

A controller-integrated rotating electrical machine according to the present invention includes a cylindrical stator, a rotor that is fixed to a rotating shaft and rotates within the stator, a front bearing that supports the rotating shaft on both axial sides of the rotor, and A motor unit having a housing for holding a rear bearing, the stator, and holding the rotor via a front bearing and a rear bearing;
A power circuit unit having a DC-AC mutual conversion circuit for passing a current to the stator and a field current switching circuit for passing a field current to the rotor;
A control circuit unit equipped with a control circuit for controlling the power circuit unit;
In a controller-integrated dynamoelectric machine comprising a ring-shaped sensor rotor for detecting the rotation angle of the rotor and a rotor position detection sensor comprising a ring-shaped sensor stator whose inner circumference faces the sensor rotor,
A cylindrical portion extending in the axial direction is provided in the center of the rear side wall portion of the housing, the rear bearing is provided in the cylindrical portion, the sensor rotor is attached to a rear side end portion of the rotating shaft, and The rear side of the rotating shaft is supported by the rear bearing so that the sensor rotor is located inside the cylindrical portion,
The sensor stator is directly fitted into the cylindrical portion so that the inner peripheral surface thereof faces the outer peripheral surface of the sensor rotor.

According to the controller-integrated rotating electrical machine according to the present invention, the cylindrical stator, the rotor that is fixed to the rotating shaft and rotates within the stator, and the front that supports the rotating shaft on both axial sides of the rotor. A motor unit including a housing that holds a bearing and a rear bearing, the stator and holds the rotor via a front bearing and a rear bearing;
A power circuit unit having a DC-AC mutual conversion circuit for passing a current to the stator and a field current switching circuit for passing a field current to the rotor;
A control circuit unit equipped with a control circuit for controlling the power circuit unit;
In a controller-integrated dynamoelectric machine comprising a ring-shaped sensor rotor for detecting the rotation angle of the rotor and a rotor position detection sensor comprising a ring-shaped sensor stator whose inner circumference faces the sensor rotor,
A cylindrical portion extending in the axial direction is provided in the center of the rear side wall portion of the housing, the rear bearing is provided in the cylindrical portion, the sensor rotor is attached to a rear side end portion of the rotating shaft, and The rear side of the rotating shaft is supported by the rear bearing so that the sensor rotor is located inside the cylindrical portion,
Since the sensor stator is directly fitted into the cylindrical portion so that the inner peripheral surface thereof faces the outer peripheral surface of the sensor rotor, the detection accuracy of the detection angle of the rotor position detection sensor is improved. be able to.

It is sectional drawing which shows Embodiment 1 of the control apparatus integrated rotary electric machine which concerns on this invention. It is sectional drawing which shows Embodiment 1 of the control apparatus integrated rotary electric machine which concerns on this invention. It is sectional drawing which shows the structure of the control apparatus integrated rotary electric machine of Embodiment 3 of this invention. It is the front view (a) of a resolver, and sectional drawing (b) of a resolver.

Embodiments of a rotating electrical machine according to the present invention will be described below with reference to the drawings.
Embodiment 1 FIG.
1 and 2 are sectional views showing Embodiment 1 of the control apparatus-integrated dynamoelectric machine according to the present invention. As shown in FIGS. 1 and 2, the controller-integrated rotating electrical machine according to the first embodiment includes a cylindrical stator 10, a rotor 8 that is fixed to the rotating shaft 7, and rotates within the stator 10, and rotates. An aluminum front bracket that holds the front bearing 5, the rear bearing 6, and the stator 10 that support the rotating shaft 7 on both sides in the axial direction of the child 8 and that holds the rotor 8 via the front bearing 5 and the rear bearing 6. 3 and a power supply circuit having a motor unit having a housing 4 composed of a rear bracket 2, a DC / AC mutual conversion circuit 16 for supplying current to the stator 10, and a field current switching circuit 17 for supplying field current to the rotor 8. Unit 18, a control circuit unit 19 having a control circuit for controlling the power circuit unit 18, and a ring-shaped sensor robot for detecting the rotation angle of the rotor 8. The inner periphery and a rotor position detection sensor 14 composed of a ring-shaped sensor stator 23 that faces the motor and the sensor rotor 30.
An end portion of the rotary shaft 7 on the front side in the axial direction of the front bearing 5 protrudes from the front bracket 3, and a pulley 15 is fixed to a tip portion thereof.

  In the housing 4, there is a power circuit section having a DC / AC mutual conversion circuit 16 for supplying phase-controlled three-phase AC power to the stator winding 24 and a field current switching circuit 17 connected to the brush holder 13. 18 (see FIG. 1) is provided, and the power circuit unit 18 supplies power to the field winding 9 via the brush 12 and the slip ring 11 provided in the brush holder 13. A control circuit unit 19 is arranged on the axially rear side of the DC / AC mutual conversion circuit 16 and the field current switching circuit 17. The control circuit unit 19 includes an external device connector 20 that relays signals between an external device provided in the vehicle and the controller-integrated rotating electrical machine.

  The control circuit unit 19 includes a control circuit unit 19 for controlling the DC / AC mutual conversion circuit 16 for supplying phase-controlled three-phase AC power to the stator winding 24 of the controller-integrated rotating electrical machine, and a field winding. A control board 21 for controlling the field current switching circuit 17 for supplying power to the line 9 is mounted, and a sensor converter for converting the detection signal of the rotor position detection sensor 14 into an angle signal on the control board 21. 22 is implemented.

  A cylindrical portion 4 a extending in the axial direction is provided at the central portion of the rear end of the housing 4 in the axial direction, a rear bearing 6 is provided in the cylindrical portion 4 a, and the rotational speed of the rotor 8 is provided at the rear end of the rotary shaft 7. A sensor rotor 30 of a rotor position detection sensor 14 for detecting the rotation position is attached, and the rear end side of the rotary shaft 7 is supported by the rear bearing 6 so that the sensor rotor 30 is positioned inside the cylindrical portion 4a. The sensor stator 23 is directly fitted into the cylindrical portion 4 a so that the inner peripheral surface thereof faces the outer peripheral surface of the sensor rotor 30, and is electrically connected to the control circuit unit 19. The output signal of the sensor stator 23 is supplied to the sensor converter 22 mounted on the control board 21 through a signal line, and is converted into an angle signal by the sensor converter 22, and this angle signal is converted into the DC / AC mutual conversion circuit 16 and the field. The current is supplied to the control circuit unit 19 that controls the current switching circuit 17 and is controlled by the DC / AC mutual conversion circuit 16 and the field current switching circuit 17 based on the angle signal. Current control is performed and control of the controller-integrated rotating electrical machine is executed.

  In the first embodiment, the cylindrical portion 4a is provided on the axial end surface on the rear side of the housing 4 (the axial end surface of the rear bracket 2), the rear bearing 6 is provided in the cylindrical portion 4a, and the rear end of the rotary shaft 7 is provided. The rear end side of the rotary shaft 7 is supported by the rear bearing 6 so that the sensor rotor 30 attached to the side end portion is positioned inside the cylindrical portion 4a. The sensor stator 23 is directly fitted into the cylindrical portion 4 a so that the inner peripheral surface thereof faces the outer peripheral surface of the sensor rotor 30. Conventionally, the first fitting protrusion and the second fitting protrusion are fitted together so that the sensor stator 23 and the sensor rotor 30 are positioned. Although the high-precision positioning could not be performed due to the processing accuracy of the second fitting protrusion, according to the first embodiment, the sensor stator 23 and the sensor rotor 30 are formed using only the cylindrical portion 4a. Since the positioning is performed, the relative position in the axial direction between the sensor stator 23 and the sensor rotor 30 of the rotor position detection sensor 14 can be easily determined, and the center axis of the sensor stator 23 and the sensor rotor can be easily positioned. Since the 30 central axes can be matched, the detection accuracy of the rotor position detection sensor 14 is improved.

  Further, as shown in FIG. 1, since the power circuit unit 18 is installed inside the housing 4 in the motor unit 1, the power circuit unit 18 that is vulnerable to external impacts can be protected from external impacts. Can lead to improved reliability.

  In addition, as shown in FIG. 2, by installing the power circuit unit 18 on the end surface in the axial direction of the housing 4, heat is radiated from the surface case of the power circuit unit 18, so that a sufficient cooling effect is obtained. In addition, the power circuit unit 18 is disposed outside, and the distance between the power circuit unit 18 and the rotor position detection sensor 14 is taken to accompany the switching of the semiconductor that controls the current of the stator three-phase and rotor field. The detection angle accuracy can be improved by reducing the generation of noise by superimposing the magnetic field generated by the change of the power circuit loop current on the sensor stator 30 of the rotor position detection sensor 14.

Embodiment 2. FIG.
The second embodiment of the rotating electrical machine structure according to the present invention will be described below.
In the second embodiment, the power circuit unit 18 and the control circuit unit 19 are used to deliver signals from the power circuit unit 18 and the control circuit unit 19 or signals from the rotor position detection sensor 14 and the control circuit unit 18. Are connected by a connector 31a, and the rotor position detection sensor 14 and the control circuit unit 18 are connected by a connector 31b.

  According to the second embodiment, the power circuit unit 18 and the control circuit unit 19 are connected by the connector 31b, and the rotor position detection sensor 14 and the control circuit unit 19 are connected by the connector 31a. Can be improved.

  Moreover, the reliability and durability can be improved by making the connector 31b and the connector 31a waterproof.

  Moreover, since removal is simple, it leads to the improvement of maintenance property, such as repair and replacement | exchange of connectors 31a and 31b.

Embodiment 3 FIG.
The third embodiment of the rotating electrical machine according to the present invention will be described below.
3 is a cross-sectional view showing a configuration of a rotating electrical machine according to Embodiment 3 of the present invention. FIG. 4 (a) is a front view of the resolver, and FIG. 4 (b) is a cross-sectional view of the resolver.

  In the third embodiment, a resolver 25 (see FIG. 4) is used as the rotor position detection sensor 14, and the other configuration is the same as in the first and second embodiments.

  A resolver 25 that is a rotor position detection sensor 14 has an annular sensor stator 23 formed by laminating thin silicon steel plates, and a plurality of teeth 26 that are formed radially inward from the sensor stator 23 are received by an insulator 27. A sensor coil 28 is wound around each tooth 26 a plurality of times via an insulator 27. The leading end of the lead wire of the sensor coil 28 wound around the tooth 26 is wound a plurality of times on a terminal 29 fixed by integral molding or press-fitting to an insulator 27 formed so as to protrude outside the sensor stator 23, and is soldered or welded. To the terminal 29. A sensor rotor 30 is provided on the central axis of the sensor stator 23 and is fixed to the rotating shaft 7 of the controller-integrated rotating electrical machine and rotates with the rotation of the rotating shaft 7. The sensor rotor 30 has a salient pole shape in which the gap permeance changes sinusoidally with respect to the angle.

  According to the third embodiment, by using the resolver 25 for the rotor position detection sensor 14, higher detection accuracy and durability than the other rotor position detection sensors 14 can be obtained.

  Examples of other general rotor position detection sensors 14 include a hall sensor and an optical encoder. The Hall sensor is excellent in reliability and durability, but the resolution is low, and the optical encoder is excellent in resolution, but inferior in reliability. For example, when mounting in an engine room of an automobile is considered, it is possible to detect the rotor position with higher accuracy by employing the resolver 25 having excellent heat resistance, vibration resistance, and noise resistance. Further, although the detection accuracy of the resolver 25 varies depending on the relative position between the sensor rotor 30 and the sensor stator 23, the sensor stator 23 and the sensor rotor are directly fitted to the cylindrical portion 4 a of the housing 4. 30 center axes can be aligned, and the detection accuracy of the detection position can be improved.

  The controller-integrated rotating electrical machine according to the present invention can be effectively used for a vehicle such as an automobile.

1 Motor part, 2 Front bracket, 3 Rear bracket, 4 Housing,
4a cylindrical portion, 5 front bearing, 6 rear bearing, 7 rotating shaft,
8 rotors, 9 field windings, 10 stators, 11 slip rings, 12 brushes,
13 brush holder, 14 rotor position detection sensor, 15 pulley,
16 DC-AC mutual conversion circuit part, 17 Field current switching circuit part,
18 power circuit section, 19 control circuit section, 20 external device connector,
21 Control board, 22 Sensor converter, 23 Sensor stator, 24 Stator winding,
25 resolver, 26 teeth, 27 insulator, 28 sensor coil,
29 terminals, 30 sensor rotors, 31a, 31b connectors.

Claims (7)

A cylindrical stator, a rotor that is fixed to a rotating shaft and rotates in the stator, a front bearing and a rear bearing that support the rotating shaft on both sides in the axial direction of the rotor, and holds the stator, and A motor unit having a housing for holding the rotor via a front bearing and a rear bearing;
A power circuit unit having a DC-AC mutual conversion circuit for passing a current to the stator and a field current switching circuit for passing a field current to the rotor;
A control circuit unit equipped with a control circuit for controlling the power circuit unit;
In a controller-integrated dynamoelectric machine comprising a ring-shaped sensor rotor for detecting the rotation angle of the rotor and a rotor position detection sensor comprising a ring-shaped sensor stator whose inner circumference faces the sensor rotor,
A cylindrical portion extending in the axial direction is provided in the center of the rear side wall portion of the housing, the rear bearing is provided in the cylindrical portion, the sensor rotor is attached to a rear side end portion of the rotating shaft, and The rear side of the rotating shaft is supported by the rear bearing so that the sensor rotor is located inside the cylindrical portion,
The controller stator-integrated rotating electrical machine, wherein the sensor stator is directly fitted into the cylindrical portion so that an inner peripheral surface thereof faces an outer peripheral surface of the sensor rotor. The control device-integrated dynamoelectric machine according to claim 1, wherein the power circuit unit is installed inside the housing. The control device-integrated dynamoelectric machine according to claim 1, wherein the power circuit unit is installed on the axial outer wall of the housing. 4. The controller-integrated rotating electrical machine according to claim 1, wherein a sensor stator of the rotor position detection sensor and the control circuit unit are connected by a connector. 5. 5. The control device-integrated dynamoelectric machine according to claim 1, wherein the power circuit unit and the control circuit unit are connected by a connector. 6. The controller-integrated rotating electrical machine according to claim 4, wherein the connector has a waterproof structure. The controller integrated rotary electric machine according to any one of claims 1 to 6, wherein a resolver is used as the rotor position detection sensor.

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