JP2002084724A - Alternating current electric machine for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain an AC electric machine for vehicles, which reduces noise generated in a rotation position detector for controlling, and detects a rotation angle accurately. SOLUTION: This AC machine is provided with an AC electric machine body 100, a second shaft 30, a second rotor 21, and a rotational position detector 20 for controlling. The machine body 100 has a rotor 10 having a first shaft 12 supported in a freely rotatable way with a pair of bearings 16, 17, a rotor core 8 stuck to the first shaft 12, and a field coil 9 wound on the rotor core 8, and a stator 3 having a stator core 1 counterposed to the rotor 10, and multiphase stator coil 2 wound on the stator core 1. The second shaft 30 is connected to the first shaft 12 through large magnetic reluctance areas 32, 33. The second rotor is stuck to the second shaft 30, and the position detector 20 has a second stator coil 22a which generates output voltage on the basis of the rotation of the second rotor 21.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an AC motor for a vehicle which is mounted on a vehicle and operates as a motor and a generator.
In particular, the present invention relates to an AC electric machine for a vehicle including a rotational position detector provided for control.

[0002]

2. Description of the Related Art FIG. 5 is a sectional view showing a conventional automotive alternator provided with a control rotational position detector. This AC electric machine has a pulley 60 at one end on the right side in FIG. 5 for enabling bidirectional power transmission with the engine. The pulley 60 is fixed to an end of the rotating shaft 12 with a nut 61.

A rotor core 8 is fixed to the rotating shaft 12, and a field winding 9 is wound around the rotor core 8.
The rotor 1 includes a rotor core 8, a field winding 9 and a rotating shaft 12.
0. The stator core 1 is arranged so as to face the rotor 10. A multi-phase stator winding 2 is wound around the stator core 1. The stator 3 is composed of the stator core 1 and the multi-phase stator winding 2.

The rotor 10 and the stator 3 are connected to a bracket 8
It is stored in 0. The rotor 10 includes a pair of bearings 1
6 and 17 are rotatably supported. Bearing 16,1
7 and the stator 3 are fixed in a bracket 80. A slip ring 15 for supplying a current to the field winding 9 is provided on one side of the rotating shaft 12. Further, a pair of brushes 13 that are in sliding contact with the slip ring 15 are provided. Further, a brush holder containing a spring 14 for pressing the brush 13 against the slip ring 15 is provided.

[0005] A resolver 2 as a control rotational position detector is provided on the opposite side of the pulley 60 behind the AC electric machine.
0 is provided. The resolver 20 includes a rotor 21 and a stator 22. The rotor 21 is fixed to the end 12 a of the rotating shaft 12. The stator 22 includes a stator winding 2
2a.

[0006] The resolver 20 is fixed to a resolver bracket 80a by a retainer 24 and a screw 23 for fixing the stator 22 in the axial direction. The retainer 24 has an annular shape and is fastened to the resolver bracket 80a with a screw 23. Then, a cover 25 is provided outside the resolver 20 to protect the resolver 20 against intrusion from outside.

Next, the operation will be described. When an exciting current is supplied to the field winding 9 via the brush 13 and the slip ring 15, a magnetic flux is generated in the rotor core 8. When the engine is started by the operation of the electric motor, in this state, the other-phase alternating current is supplied to the multi-phase stator winding 2 to generate a torque in the rotor 10 and transmit the torque by the belt via the pulley 60. And the engine is driven. In this embodiment, the pulley 60 and the poly-V belt are used as the torque transmitting means, but the belt may be a toothed belt or a chain.

On the other hand, when electric power is supplied to the vehicle electric load by the operation of the generator, the exciting current is supplied to the field winding 9 via the brush 13 and the slip ring 15 and the magnetic flux is generated in the iron core 8. Is transmitted from the engine to the pulley 60 via a belt, and when the rotor rotates, electric power is generated in the multi-phase stator winding 2.

In the vehicle AC electric machine having such a configuration, when the rotor 21 of the resolver 20 is rotated and the excitation winding of the stator 22 of the resolver 20 is energized, the stator 2
The two windings generate a two-phase output voltage that varies according to a sine curve and a cosine curve. Then, the rotation angle (absolute position) is calculated by comparing the two.

[0010]

In the conventional vehicular AC electric machine having such a configuration, as described above, the resolver 20 as the control rotational position detector is provided with the stator winding wound around the stator 22. The rotation angle is calculated based on the voltage induced on the line 22a. Therefore, there is a problem that when the leakage magnetic flux from the AC electric machine main body 100 is linked to the stator winding 22a, an accurate rotation angle cannot be detected.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problem, and it is possible to reduce noise generated in a control rotational position detector and to accurately detect a rotational angle. The purpose of this is to obtain an AC electric machine.

[0012]

In a vehicle AC electric machine according to the present invention, a first rotating shaft rotatably supported by a pair of bearings, a rotor core fixed to the first rotating shaft, and A rotor having a field winding wound on the rotor core, a stator having a stator core disposed opposite to the rotor, and a stator having a polyphase stator winding wound on the stator core, An AC electric machine main body having a pair of bearings and a bracket for supporting the stator, a second rotating shaft coupled to the first rotating shaft via a large magnetic resistance, and fixed to the second rotating shaft; And a control rotational position detector having a second stator winding for generating an output voltage based on the rotation of the second rotor.

The majority of the magnetoresistance is a coupling coupled via a non-magnetic substance.

The large magnetic resistance portion is a small shaft diameter portion provided between the first rotating shaft and the second rotating shaft.

[0015] The second rotating shaft is made of a non-magnetic substance.

Further, only a washer is used as a fixing means of the control rotational position detector.

Further, the AC electric machine main body is installed in the engine of the vehicle so as to be capable of bidirectional power transmission by a transmission means such as a belt or a chain, so that the engine can be started by the operation of the motor and the power can be supplied to the vehicle by the operation of the generator. It is.

Further, the large part of the magnetic resistance and the control rotational position detector are provided on the side of the AC electric machine main body opposite to the transmitting means.

[0019]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiment 1 FIG. 1 is a cross-sectional view showing an embodiment of the automotive alternator of the present invention. In FIG. 1, this AC electric machine has a pulley 60 at one end for enabling bidirectional power transmission with the engine. The pulley 60 is fixed to an end of the rotating shaft 12 as a first rotating shaft with a nut 61.

The rotor core 8 is fixed to the rotating shaft 12. A field winding 9 is wound around the rotor core 8. The rotor 10 includes the rotor core 8, the field winding 9, and the rotating shaft 12. Stator iron core 1 is arranged so as to face rotor 10. A multi-phase stator winding 2 is wound around the stator core 1. The stator 3 is composed of the stator core 1 and the multi-phase stator winding 2.

The rotor 10 and the stator 3 are connected to the bracket 8
It is stored in 0. The rotor 10 includes a pair of bearings 1
6 and 17 are rotatably supported. Bearing 16,1
7 and the stator 3 are fixed in a bracket 80. A slip ring 15 for supplying a current to the field winding 9 is provided on one side of the rotating shaft 12. Further, a pair of brushes 13 that are in sliding contact with the slip ring 15 are provided. Further, a brush holder containing a spring 14 for pressing the brush 13 against the slip ring 15 is provided. The above parts, that is, the rotor 10, the stator 3, the bracket 80, the pulley 60, and the slip ring 1
The brush 5, the brush 13, and the spring 14 constitute an AC electric machine main body 100 as a main part of the AC electric machine.

On the opposite side of the pulley 60 behind the AC electric machine main body 100, a resolver 20 as a control rotational position detector is provided. The resolver 20 has a second
And a stator 22 as a second stator. The stator 22 has a stator winding 22a as a second stator winding. Resolver 20
Has a very small output of 2 to 3 V and has no function as a generator. The resolver 20 forms a control rotation position detector, that is, a pickup of the AC electric machine main body 100.

The rotor 21 is fixed to a rotating shaft 30 as a second rotating shaft. The rotating shaft 30 is rotatably supported by a bearing 31. The bearing 31 is fixed to the resolver bracket 80a with a retaining ring 34. Rotary axis 3
0 is made of a non-magnetic metal such as stainless steel, copper, or aluminum.

The first rotating shaft 12 and the second rotating shaft 30 are connected by a coupling 32 connected via a non-magnetic material 33 such as stainless steel. Substance 33
The coupling 32 forms a large part of the magnetic resistance that reduces the magnetic flux leaking from the first rotating shaft 12 to the second rotating shaft 30.

The resolver 20 is fixed to a resolver bracket 80a by a retainer 24 and a screw 23 for fixing the stator 22 in the axial direction. The retainer 24 has an annular shape and is fastened to the resolver bracket 80a with a screw 23. Then, a cover 25 is provided outside the resolver 20 to protect the resolver 20 against intrusion from outside.

For this reason, in the automotive alternator according to the present embodiment, the first rotating shaft 12 and the first rotating shaft 12 rotatably supported by the pair of bearings 16 and 17 are provided.
A rotor core 10 fixed to the rotor core, a rotor 10 having a field winding 9 wound around the rotor core 8, a stator core 1 opposed to the rotor 10, and a stator core 1. A stator 3 having a wound polyphase stator winding 2 and a bracket 8 supporting a pair of bearings 16 and 17 and the stator 3
0 and the first rotating shaft 12
A second rotating shaft 30, which is coupled to a large part of the magnetic resistance,
And the second rotor 2 fixed to the second rotating shaft 30
1 and a resolver 20 having a second stator winding 22a for generating an output voltage based on the rotation of the second rotor 21.
And In such a winding field type rotary electric machine, the magnetic flux linked to the stator winding 22a of the resolver 20 is generated by the large magnetic resistance provided between the first and second rotating shafts 12 and 30. Therefore, the noise generated in the resolver 20 is reduced, and the rotation angle can be accurately detected.

The majority of the magnetic resistance is made of a non-magnetic substance 33.
Through the coupling 32. Therefore, the magnetic flux linked to the stator winding 22a of the resolver 20 is reduced by the non-magnetic substance 33 provided between the first and second rotating shafts 12 and 30 becoming a magnetic resistance,
Noise generated in the resolver 20 is more reliably reduced, and the rotation angle can be detected more accurately.

The second rotation shaft 30 is made of a non-magnetic substance. The second rotating shaft 30 for fixing the rotor 21 of the resolver 20 is made of a non-magnetic substance, that is, a non-magnetic metal or resin.
Does not constitute a magnetic circuit, the magnetic flux linked to the stator winding 22a of the resolver 20 is reduced, and the resolver 20
Is reduced, and the rotation angle can be detected more accurately.

The AC motor main body 100 is installed in the engine of the vehicle so as to be capable of bidirectional power transmission by a transmission means such as a belt or a pulley 60, and starts the engine by the operation of the electric motor and supplies electric power to the vehicle by the operation of the generator. Is possible. At the time of starting the engine by the operation of the motor of the AC electric machine main body 100 and at the time of supplying power to the vehicle by the operation of the generator,
The magnetic flux linked to the stator winding 22a of the resolver 20 is reduced, and the noise generated in the resolver 20 is reduced, so that the controllability of the vehicle is improved.

Further, most of the magnetic resistance and the resolver 2
0 is provided on the side opposite to the transmission means such as the pulley 60 of the AC electric machine main body 100. Therefore, a space for installing the resolver 20 can be easily secured, and the first rotating shaft 12 and the second rotating shaft 30 can be provided on the same axis, thereby simplifying the configuration. Can be.

In the present embodiment, the non-magnetic substance 33 is made of stainless steel or the like, but may be a non-magnetic metal such as copper or aluminum, or air or resin.
Here, when air is used as the non-magnetic substance 33, the coupling 32 is a double-sided bottomed cylinder that traps air therein.

In the present embodiment, the large part of the reluctance and the resolver 20 are provided on the side opposite to the transmitting means. However, as long as the space and the connecting mechanism can be constituted, the transmitting means, that is, the It may be provided on the front side.

Embodiment 2 FIG. FIG. 2 is a sectional view showing another embodiment of the automotive alternator of the present invention. In the present embodiment, the first rotating shaft 12 is extended to the side opposite to the pulley 60 to form the second rotating shaft 36.
A small shaft diameter portion 37 is provided between the first rotation shaft 12 and the second rotation shaft 36 as a large magnetic resistance portion. The small shaft diameter portion 37 reduces the magnetic flux leaking from the first rotating shaft 12 to the second rotating shaft 30. Other configurations are described in Embodiment 1.
Is the same as

As described above, in the present embodiment, the large magnetic resistance portion is the small shaft diameter portion 37 provided between the first rotating shaft 12 and the second rotating shaft 36. The magnetic flux linked to the stator winding 22a of the resolver 20 is reduced by the small shaft diameter portion 37 provided between the first and second rotating shafts 12 and 36, and the noise generated in the resolver 20 is reduced. The rotation angle can be detected more accurately. Further, since the large portion of the magnetic resistance is the small shaft diameter portion 37, it can be easily provided, and the AC electric machine can be made compact without increasing the overall length.

Embodiment 3 FIG. FIG. 3 is a cross-sectional view showing still another embodiment of the automotive alternator of the present invention. FIG. 4 is a view on arrow P in FIG. In the present embodiment,
Resolver bracket 80a of stator 22 of resolver 20
The structure is such that the iron core of the stator 20 is pressed with a washer 26 and fixed with a screw 23. That is,
The fixation of the resolver 20 is performed only by the washer 26, and the annular retainer used in the first embodiment and the conventional example is not used. Since a large load is not applied to the resolver 20 in the axial direction, only the washer 26 is sufficient for fixing. Other configurations are the same as those of the first embodiment.

As described above, in this embodiment, only the washer 26 is used as the fixing means of the resolver 20. Since the retainer is abolished, the number of parts is reduced, and assembling workability is improved. Further, the material can be reduced, and the cost can be reduced.

[0037]

According to the AC motor for a vehicle according to the present invention, the first rotating shaft rotatably supported by the pair of bearings, the rotor core fixed to the first rotating shaft, and the rotor core A rotor having a wound field winding, a stator having a stator core disposed opposite to the rotor, and a stator having a polyphase stator winding wound on the stator core, and a pair of bearings. An AC electric machine main body having a bracket for supporting the stator, a second rotating shaft coupled to the first rotating shaft via a large magnetic resistance portion, and a second rotating shaft fixed to the second rotating shaft. And a control rotational position detector having a second stator winding that generates an output voltage based on the rotation of the second rotor. In a winding field type rotary electric machine, a field winding is wound around a rotor core and fixed to a rotating shaft. Therefore, when a field current is applied to the field winding and a magnetic flux is generated in the rotor core, a leakage magnetic flux having a rotating shaft as a magnetic path is generated, and the stator winding of the control rotation position detector is connected to the stator winding. Although the linkage has been a cause of noise, as described above, the magnetic flux linked to the stator winding of the control rotational position detector is the first magnetic flux.
The noise is reduced by the large part of the magnetic resistance provided between the second rotation shafts, the noise generated in the control rotation position detector is reduced, and the rotation angle can be accurately detected.

The majority of the magnetoresistance is a coupling coupled via a non-magnetic substance. The magnetic flux linked to the stator winding of the control rotation position detector is reduced by the non-magnetic substance provided between the first and second rotation shafts becoming magnetic resistance, and the control rotation position is reduced. Noise generated in the detector is more reliably reduced, and the rotation angle can be detected more accurately.

The large magnetic resistance portion is provided between the first rotating shaft and the second rotating shaft and has a small shaft diameter. The magnetic flux linked to the stator winding of the control rotational position detector is reduced by a small shaft diameter portion provided between the first and second rotating shafts,
Noise generated in the control rotation position detector is reduced, and the rotation angle can be detected more accurately. Further, the large part of the magnetic resistance can be easily provided, and the AC electric machine can be made compact without increasing the overall length.

The second rotating shaft is made of a non-magnetic substance. Since the second rotation axis for fixing the rotor of the control rotation position detector is made of a non-magnetic substance, that is, a non-magnetic metal or resin, the second rotation axis does not form a magnetic circuit. The magnetic flux linked to the stator winding of the control rotation position detector is reduced, the noise generated in the control rotation position detector is reduced, and the rotation angle can be detected more accurately.

Further, only a washer is used as a fixing means of the control rotational position detector. By using only the washer as a fixing means of the control rotational position detector, the retainer can be eliminated, so that the number of parts is reduced and the assembling workability is improved. Further, the material can be reduced, and the cost can be reduced.

Further, the AC electric machine main body is installed in the engine of the vehicle so as to be capable of bidirectional power transmission by a transmission means such as a belt or a chain, so that the engine can be started by the operation of the motor and the power can be supplied to the vehicle by the operation of the generator. It is. Even when the engine is started by the operation of the motor of the AC electric machine and when power is supplied to the vehicle by the operation of the generator, the magnetic flux linked to the stator winding of the control rotation position detector is reduced, and the control rotation position is reduced. Since the noise generated in the detector is reduced, the controllability of the vehicle is improved.

Further, the large part of the magnetic resistance and the control rotational position detector are provided on the side of the AC electric machine main body opposite to the transmitting means. On the front side of the AC electric machine main body, a pulley or the like as a transmission means is provided, and it is difficult to provide a space for installing a control rotational position detector and a connecting means for the control rotational position detector and the AC electric machine main body, On the side opposite to the transmission means, a space for installing the control rotational position detector can be easily secured, and the first rotational axis and the second rotational axis can be provided on the same axis. Therefore, the configuration can be simplified.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view illustrating an embodiment of a vehicular AC electric machine according to the present invention.

FIG. 2 is a sectional view showing another embodiment of the vehicular AC electric machine of the present invention.

FIG. 3 is a sectional view showing still another embodiment of the vehicular AC electric machine of the present invention.

FIG. 4 is a view as seen from an arrow P in FIG. 3;

FIG. 5 is a cross-sectional view showing a conventional automotive alternator provided with a control rotational position detector.

[Explanation of symbols]

1 stator core, 2 polyphase stator winding, 3 stator, 8
Rotor core, 9 field windings, 10 rotors, 12 first rotating shaft, 16, 17 bearing, 20 resolver (control rotational position detector), 21 second rotor, 22 second stator , 22a second stator winding, 26 washer, 30, 36 second rotation axis, 32 coupling (large reluctance), 33 non-magnetic material (large reluctance),
37 shaft diameter small part (large magnetic resistance part), 60 pulleys (transmission means), 80, 80a bracket, 100 AC electric machine main body.

Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat II (reference) H02K 11/00 H02K 19/22 19/22 24/00 24/00 H02P 9/04 L H02P 9/04 J H02K 11 / 00C (72) Inventor Yoshinobu Utsumi 2-6-1 Otemachi, Chiyoda-ku, Tokyo F-term in Mitsubishi Electric Engineering Co., Ltd. (reference) 5H590 AA05 AA22 CB10 CC01 CC18 CC23 CC29 DD02 HA02 5H607 BB01 BB02 BB05 BB14 CC01 CC03 CC05 CC07 DD01 DD02 DD03 DD07 DD09 DD17 EE28 FF11 FF22 FF24 GG01 GG08 HH01 HH03 HH06 5H611 AA01 BB01 BB02 BB04 PP05 QQ01 QQ03 QQ06 RR01 UA01 UA07 5H619 AA13 BB01 BB02 BB06 PP20

Claims (7)

[Claims] A first rotating shaft rotatably supported by a pair of bearings; a rotor core fixed to the first rotating shaft;
A rotor having a field winding wound around the rotor core, a stator core disposed opposite to the rotor, and a multi-phase stator winding wound around the stator core. A stator, an AC electric machine main body having a bracket supporting the pair of bearings and the stator, a second rotating shaft coupled to the first rotating shaft via a large magnetic resistance portion, and A second rotor fixed to the second rotating shaft; and a control rotational position detector having a second stator winding that generates an output voltage based on the rotation of the second rotor. An AC electric machine for a vehicle, comprising: 2. The AC electric machine for a vehicle according to claim 1, wherein the major part of the magnetic resistance is a coupling coupled via a non-magnetic substance. 3. The vehicle according to claim 1, wherein the large reluctance portion is a small shaft diameter portion provided between the first rotation shaft and the second rotation shaft. AC electric machine. 4. The AC electric machine for a vehicle according to claim 1, wherein the second rotating shaft is made of a non-magnetic substance. 5. The automotive alternator according to claim 1, wherein only a washer is used as the fixing means of the control rotational position detector. 6. The AC electric machine main body is installed in the engine of the vehicle so as to be capable of bidirectional power transmission by a transmission means such as a belt or a chain, and starts the engine by an electric motor operation and supplies electric power to the vehicle by a generator operation. The AC machine for a vehicle according to any one of claims 1 to 5, wherein the AC machine is capable of being used. 7. The alternating current for a vehicle according to claim 6, wherein the large part of the magnetic resistance and the rotational position detector for control are provided on a side of the AC electric machine main body opposite to the transmitting means. Electric machine.