JP2010166745A - Variable characteristics rotating electrical machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rotating electrical machine capable of reducing an induced voltage at high-speed rotation, without incurring a drop in reluctance torque. <P>SOLUTION: By supplying the armature coils 7 and 8 of a stator 1 with currents to drive the rotating electrical machine, a magnetic path &alpha;m by a permanent magnet row 13 arise between a stator 1 and a rotor 2, and a magnetic path &alpha;r by a salient pole row 16, which does not include a permanent magnet, arises between the stator 1 and the rotor 3, so as to drive the rotating machine. At high-speed rotation in which an induced voltage is generated, it displaces the rotor 2 right in the figure from a position at high-speed rotation as shown in Fig.(a), and brings a magnetic short-circuiting projection 14 close to the stator 1 to reduce the induced voltage by the magnetic short-circuit of the rotor 2. In such reduction of the induced voltage, it merely performs the magnetic short-circuit of the rotor 2 by bringing only the rotor 2 close to the stator 1, so that it can suppress a drop in reluctance torque. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

  The present invention relates to an axial gap type or radial gap type rotating electrical machine including a stator concentrically arranged with a predetermined air gap in a radial direction or an axial direction, and at least two rotors, and particularly has operating characteristics. The present invention relates to a variable characteristic rotating electrical machine that is variable.

As this type of variable-characteristic rotating electric machine, there has conventionally been known one as described in Patent Document 1, for example.
This variable characteristic rotating electric machine is an axial gap type rotating electric machine having a stator and a rotor arranged concentrically and concentrically with a predetermined air gap in the axial direction.
The rotor can be displaced in the axial direction, and at the time of high speed rotation, the rotor is displaced in the axial direction relative to the stator and magnetically short-circuited to reduce the induced voltage that becomes noticeable at the time of high speed rotation.

Japanese Patent Laid-Open No. 2002-325412

However, if all rotors are displaced in the axial direction relative to the stator as in the past, the induced voltage during high-speed rotation can be reduced by reducing the no-load magnetic flux,
The inductance of the rotor shaft increases, the rotor salient pole ratio decreases, and the reluctance torque decreases.

  For this reason, in the rotating electrical machine in which the rotor rotated by the reluctance torque exists, there is a problem that the output torque of the rotating electrical machine decreases due to the decrease in the reluctance torque.

  In view of the above problems, an object of the present invention is to provide a variable characteristic rotating electrical machine that can reduce an induced voltage during high-speed rotation while suppressing a decrease in reluctance torque.

For this purpose, the variable characteristic rotating electric machine according to the present invention is as described in claim 1,
A stator having a predetermined air gap and concentrically arranged, and at least two rotors,
In the variable characteristic rotating electrical machine in which the rotor is magnetically short-circuited and the characteristics are changed by the magnetic field change accompanying this,
Different salient pole ratios between the rotors,
Between the rotor of one of these rotors and the stator, a field is formed by a permanent magnet, and a magnetic path passing through the yoke of the stator is formed to generate an induction torque.
A field that does not include a permanent magnet is formed between the other rotor and the stator, and a magnetic path that passes through the yoke of the stator is formed to generate reluctance torque.
Only one of the rotors having different salient pole ratios is magnetically short-circuited to cause the characteristic change.

According to the variable characteristic rotating electric machine of the present invention,
Because it is configured to change the characteristics of the rotating electrical machine by magnetically short-circuiting only one of the rotors with different salient pole ratios,
The desired purpose can be achieved without magnetically shorting all the rotors, thus changing the characteristics of the rotating electrical machine without causing a situation where the inductance of the rotor shaft increases and the reluctance torque decreases. Can be made.

  For this reason, even in a rotating electrical machine in which a rotor that is rotated by reluctance torque exists, the characteristics of the rotating electrical machine are changed to characteristics for high-speed rotation in which the induced voltage is suppressed without being accompanied by a reduction in output torque of the rotating electrical machine. can do.

1 shows a variable characteristic rotating electric machine according to a first embodiment of the present invention, (a) is a longitudinal side view of the main part thereof, (b) is a partially broken front view of one rotor, and (c) is the other side of the rotor. It is a front view of a rotor. FIG. 2 shows a variable characteristic rotating electrical machine according to a second embodiment of the present invention, (a) is a longitudinal sectional side view of the main part, (b) is a partially broken front view of one rotor, and (c) is the other side. It is a front view of a rotor. FIG. 7 is a longitudinal sectional side view of a main part similar to FIG. 1 (a), showing a variable characteristic rotating electrical machine according to a third embodiment of the present invention. FIG. 9 is a longitudinal sectional side view of a main part similar to FIG. 1 (a), showing a variable characteristic rotating electrical machine according to a fourth embodiment of the present invention. FIG. 10 is a longitudinal sectional side view of a main part similar to FIG. 1 (a), showing a variable characteristic rotating electrical machine according to a fifth embodiment of the present invention. It is a characteristic diagram showing the change characteristic of the output torque with respect to the electrical angle of the variable characteristic rotating electric machine in the first to fifth embodiments, (a) is a characteristic showing the output torque change characteristic of the variable characteristic rotating electric machine before the magnetic short circuit (B) is a characteristic diagram showing the output torque change characteristic of the variable-characteristic rotating electrical machine after the magnetic short-circuit, and (c) is a comparison of the output torque change characteristics of the variable-characteristic rotating electrical machine before and after the magnetic short-circuit. FIG.

Hereinafter, embodiments of the present invention will be described in detail based on illustrated first to fifth embodiments.
<First embodiment>
FIG. 1 (a) is a longitudinal sectional side view showing a main part of a variable characteristic rotating electric machine according to a first embodiment of the present invention, in which 1 indicates a stator, and 2 and 3 indicate rotors.
The stator 1 has armature windings 7 and 8 wound around yokes 5 and 6 projecting to both sides in the axial direction of the annular armature core 4, and the armature core 4 and the armature windings 7 and 8 are made of resin. Covered with mold 9 to make an annular shape.
Such an annular stator 1 has its outer peripheral surface fitted into the housing 10.

  The rotors 2 and 3 are coaxially arranged opposite to each other with predetermined axial air gaps on both sides in the axial direction of the stator 1, and these rotors 2 and 3 are supported on the rotor shaft 11.

One rotor 2 is configured by providing a permanent magnet row 13 on an annular rotating field core 12, and this permanent magnet row 13 is disposed so as to face the arrangement circle of the stator yoke 5 in the axial direction.
As shown in FIG. 1 (b), the permanent magnet array 13 is configured by alternately arranging N-pole permanent magnets 13a and S-pole permanent magnets 13b in the circumferential direction, and these N-pole permanent magnets 13a and S-pole permanent magnets 13b are arranged. The salient pole ratio of the rotor 2 is made relatively small so that there is no gap between them.

When the rotor 2 is supported on the rotor shaft 11, the rotor 2 is rotationally engaged on the rotor shaft 11 but supported so as to be axially displaceable.
Then, when the rotor 2 approaches the stator 1 due to such axial displacement, a magnetic short-circuit projection 14 that magnetically shorts the rotor 2 to cause a field change is fixed to the surface of the rotor 2 facing the stator 1 To do.

As shown in FIG. 1 (a), the other rotor 3 is configured by providing a salient pole row 16 on an annular rotating field core 15, and this salient pole row 16 is opposed to the arrangement circle of the stator yoke 6 in the axial direction. Arrange to do.
As shown in FIG. 1 (c), the salient pole row 16 is configured by alternately arranging the convex poles 16a and the concave parts 16b in the circumferential direction so that the salient pole ratio of the rotor 3 is larger than the salient pole ratio of the rotor 2. .

  When the rotor 3 is supported on the rotor shaft 11, the rotor 3 is rotationally engaged on the rotor shaft 11 and supported so as not to be displaced in the axial direction.

The operation of the variable characteristic rotating electrical machine according to the first embodiment will be described below.
When driving the rotating electrical machine of this embodiment, current is supplied to the armature windings 7 and 8 of the stator 1.
At this time, as shown in FIG. 1 (a), an axial magnetic path αm having a field by the permanent magnet array 13 is generated between the stator 1 and the rotor 2, and between the stator 1 and the rotor 3, a permanent magnetic path αm is generated. An axial magnetic path αr having a field due to the salient pole row 16 not including a magnet is generated.

  By the way, during low-speed rotation, the rotor 2 having a small salient pole ratio among the rotors 2 and 3 is arranged so that an axial air gap for low-speed rotation exists between the stator 2 and the stator 1, as shown in FIG. Keep away from 1.

In this case, the induction torque Tm by the field including the permanent magnet array 13 (by the induction motor) and the reluctance torque Tr by the field via the salient pole array 16 not including the permanent magnet array 13 (by the reluctance motor) are respectively , With respect to the β angle (electrical angle) of the current supplied to the armature windings 7 and 8, as shown in FIG. 6 (a) by a one-dot chain line and two-dot chain line,
The total output torque Ttotal (= Tm + Tr) of the rotating electrical machine, which is the sum of these values, is as shown by the solid line in FIG. 6 (a).

On the other hand, during high-speed rotation where the induced voltage increases, rotor 2 with a small salient pole ratio among rotors 2 and 3 is displaced from the position shown in FIG. Make the axial air gap between 1 and 2 small for high speed rotation.
As a result, the magnetic short-circuit protrusion 14 approaches the stator 1 to magnetically short-circuit the rotor 2, and the induced voltage during high-speed rotation can be reduced by reducing the no-load magnetic flux.

Incidentally, in this case, the induction torque Tm due to the field including the permanent magnet array 13 and the reluctance torque Tr due to the field via the salient pole array 16 not including the permanent magnet array 13 are respectively transferred to the armature windings 7 and 8. The electrical angle β of the current to be supplied is as shown by a one-dot chain line and a two-dot chain line in FIG.
The total output torque Ttotal (= Tm + Tr) of the rotating electrical machine, which is the sum of these values, is as shown by a broken line in FIG. 6 (b).

However, when reducing the induced voltage, only the rotor 2 having a small salient pole ratio is displaced in the axial direction so as to approach the stator 1, and the rotor 2 is magnetically short-circuited. In order to keep the axial air gap between
As is clear from the comparison between the two-dot chain line in FIG. 6 (a) and the two-dot chain line in FIG. 6 (b), the decrease of the reluctance torque Tr from before the magnetic short circuit to after the magnetic short circuit can be suppressed. ,
The decrease in the overall output torque Ttotal of the rotating electrical machine from before the magnetic short-circuit to after the magnetic short-circuit can be suppressed to the level from the solid line level in FIG. 6 (c) to the broken line level.

As is clear from the comparison of the output torque Ttotal (before magnetic short circuit) indicated by the solid line in FIG. 6 (c) and the output torque Ttotal (after magnetic short circuit) indicated by the broken line,
The electrical angle β of the current supplied to the armature windings 7 and 8 is preferably changed so that the absolute value thereof increases as the induction torque Tm decreases. Of course.

<Second embodiment>
FIG. 2 shows a variable characteristic rotating electric machine according to a second embodiment of the present invention.
In this embodiment, as shown in FIG. 2 (a), the stator 1 is arranged in an annular shape with an armature core 21, an armature winding 23 that is toroidally wound around a yoke 22 that extends in the circumferential direction, and these The armature core 21 and the armature winding 23 are covered with a resin mold 24 to make an annular shape,
The outer peripheral surface of the annular stator 1 is fitted in the housing 10 and the stator 1 is accommodated in the housing 10.

The rotors 2 and 3 are respectively configured in the same manner as in the first embodiment as shown in FIGS. 2 (b) and 2 (c), and the rotors 2 and 3 are respectively stators in the same manner as in the first embodiment. For example, they are placed opposite to each other in the axial direction of 1
As described above, the same configuration as that of the first embodiment shown in FIGS. 1 and 2 is followed except that the coil of the stator 1 is the toroidal winding 23.

Therefore, the variable characteristic rotating electric machine according to the second embodiment described above can also be operated in the same manner as in the first embodiment to achieve the same effect.
In the second embodiment, the axial dimension of the stator 1 can be reduced by using the toroidal winding 23 as the coil of the stator 1.

<Third embodiment>
FIG. 3 is a longitudinal sectional side view of an essential part showing a variable characteristic rotating electric machine according to a third embodiment of the present invention.
This embodiment is basically configured in the same manner as the first embodiment shown in FIG. 1 (a), except that the stator 1 and the rotors 2 and 3 are as follows.

That is, a pair of yokes 5-1, 5-2 and 6-1, 6-2 are provided so as to protrude on both sides in the axial direction of the annular armature core 4,
Armature windings 7-1, 7-2 and 8-1, 8-2 are wound around each yoke 5-1, 5-2 and 6-1, 6-2,
The armature core 4 and the armature windings 7-1, 7-2 and 8-1, 8-2 are covered with a resin mold 9 to make an annular shape.
Such an annular stator 1 has its outer peripheral surface fitted into the housing 10.

  Each of the rotors 2 and 3 arranged coaxially facing each other with a predetermined axial air gap on both sides in the axial direction of the stator 1 is configured as follows.

One rotor 2 is configured by providing permanent magnet rows 13-1 and 13-2 on an annular rotating field core 12, and these permanent magnet rows 13-1 and 13-2 are respectively formed as stator yokes 5-1, It is arranged so as to face the array circle of 5-2 in the axial direction.
Each of the permanent magnet arrays 13-1 and 13-2 is constituted by alternately arranging the N pole permanent magnets and the S pole permanent magnets in the circumferential direction, like the permanent magnet array 13 shown in FIG. The salient pole ratio of the rotor 2 is made relatively small so that there is no gap between the pole permanent magnet and the S pole permanent magnet.

The rotor 2 is supported on the rotor shaft 11, and at this time, the rotor 2 is rotationally engaged on the rotor shaft 11 but supported so as to be axially displaceable.
Then, when the rotor 2 approaches the stator 1 due to such axial displacement, a magnetic short-circuit projection 14 that magnetically shorts the rotor 2 to cause a field change is fixed to the surface of the rotor 2 facing the stator 1 To do.

The other rotor 3 is configured by providing salient pole rows 16-1 and 16-2 on an annular rotating field iron core 15, and these salient pole rows 16-1 and 16-2 are formed by stator yokes 6-1, 6-2. Arrange it to face the array circle of -2 in the axial direction.
Each of the salient pole rows 16-1 and 16-2 is configured by alternately arranging convex poles and concave portions in the circumferential direction, like the salient pole row 16 shown in FIG. Is larger than the salient pole ratio of the rotor 2.

The rotor 3 is supported on the rotor shaft 11, and at this time, the rotor 3 is rotationally engaged with the rotor shaft 11 and supported so as not to be displaced in the axial direction.
Other than that, the configuration is the same as that of the first embodiment shown in FIG.

The operation of the variable characteristic rotating electrical machine according to the third embodiment will be described below.
When driving the rotating electrical machine of the present embodiment, current is supplied to the armature windings 7-1, 7-2 and 8-1, 8-2 of the stator 1.
At this time, as shown in FIG. 3, an axial magnetic path αm having a field due to the permanent magnet arrays 13-1 and 13-2 is generated between the stator 1 and the rotor 2, and between the stator 1 and the rotor 3 is generated. Generates an axial magnetic path αr having a field by salient pole rows 16-1 and 16-2 not including a permanent magnet.

  By the way, in the present embodiment, the unique stator yokes 5-1, 5-2 and 6-1, 6-2 (armature windings 7-1, 7-2 and 8-1, 8-2) described above are used. Due to the configuration, the unique configuration of the permanent magnet rows 13-1 and 13-2 related to the rotor 2, and the unique configuration of the salient pole rows 16-1 and 16-2 related to the rotor 3, The paths αm and αr are shortened, the iron loss is reduced, and the efficiency of the rotating electrical machine can be improved.

  When the rotating electrical machine rotates at a low speed, the rotor 2 having a small salient pole ratio among the rotors 2 and 3 has a stator 1 so that an axial air gap for low-speed rotation exists between the rotor 1 and the stator 1, as shown in FIG. Keep away from.

In this case, the induction torque Tm by the field including the permanent magnet rows 13-1 and 13-2 (by the induction motor) and the salient pole rows 16-1 and 16 not including the permanent magnet rows 13-1 and 13-2 The reluctance torque Tr due to the field via -2 (by the reluctance motor) is the β angle (electrical angle) of the current supplied to the armature windings 7-1,7-2 and 8-1,8-2, respectively. On the other hand, as shown in FIG. 6 (a) by a one-dot chain line and a two-dot chain line,
The total output torque Ttotal (= Tm + Tr) of the rotating electrical machine, which is the sum of these values, is as shown by the solid line in FIG. 6 (a).

On the other hand, during high-speed rotation where the induced voltage increases, rotor 2 with a small salient pole ratio among rotors 2 and 3 is displaced to the right in the figure from the position shown in FIG. Make the axial air gap between them small for high speed rotation.
As a result, the magnetic short-circuit protrusion 14 approaches the stator 1 to magnetically short-circuit the rotor 2, and the induced voltage during high-speed rotation can be reduced by reducing the no-load magnetic flux.

Incidentally, in this case, the induction torque Tm caused by the field including the permanent magnet rows 13-1 and 13-2 and the salient pole rows 16-1 and 16-2 not including the permanent magnet rows 13-1 and 13-2 are used. The reluctance torque Tr due to the magnetic field is shown in FIG. 6 (b) with respect to the electrical angle β of the current supplied to the armature windings 7-1, 7-2 and 8-1, 8-2. It will be as shown by the chain line,
The total output torque Ttotal (= Tm + Tr) of the rotating electrical machine, which is the sum of these values, is as shown by a broken line in FIG. 6 (b).

However, when reducing the induced voltage, only the rotor 2 having a small salient pole ratio is displaced in the axial direction so as to approach the stator 1, and the rotor 2 is magnetically short-circuited. In order to keep the axial air gap between
As is clear from the comparison between the two-dot chain line in FIG. 6 (a) and the two-dot chain line in FIG. 6 (b), the decrease of the reluctance torque Tr from before the magnetic short circuit to after the magnetic short circuit can be suppressed. ,
The decrease in the overall output torque Ttotal of the rotating electrical machine from before the magnetic short-circuit to after the magnetic short-circuit can be suppressed to the level from the solid line level in FIG. 6 (c) to the broken line level.

<Fourth embodiment>
FIG. 4 shows a variable characteristic rotating electric machine according to a fourth embodiment of the present invention. This embodiment has the effect of shortening the magnetic paths αm and αr as in the third embodiment of FIG. It can be achieved by different configurations.

For this purpose, in this embodiment, the rotors 2 and 3 have the same configuration as that of the third embodiment shown in FIG. 3, but the stator 1 has the following unique configuration.
In other words, the stator 1 is arranged in an annular shape with the armature cores 31, the armature winding 33 wound around the yoke 32 of the armature core 31 extending in the radial direction indicated by the arrow A, the armature cores 31 and The armature winding 33 is covered with a resin mold 34 to make an annular shape,
The outer peripheral surface of the annular stator 1 is fitted in the housing 10 and the stator 1 is accommodated in the housing 10.

According to the variable characteristic rotating electric machine of the fourth embodiment, when a current is supplied to the armature winding 33 of the stator 1 when driving the rotating electric machine,
Between the stator 1 and the rotor 2, an axial magnetic path αm having a field by the permanent magnet arrays 13-1 and 13-2 is generated, and between the stator 1 and the rotor 3, salient poles that do not include a permanent magnet. An axial magnetic path αr having a field by the columns 16-1 and 16-2 is generated.

These axial magnetic paths αm, αr are the same as those in the third embodiment shown in FIG. 3, and the magnetic paths αm, αr are short, and iron loss can be reduced.
As a result, the efficiency of the rotating electrical machine can be improved in the same manner as in the third embodiment, but with a different configuration.

<Fifth embodiment>
FIG. 5 shows a variable characteristic rotating electric machine according to a fifth embodiment of the present invention. In this embodiment, a radial gap type rotating electric machine is obtained such that the same operational effects as those of the respective embodiments described above can be obtained. It is.

  For this reason, the rotating electrical machine includes an annular stator 41, an outer rotor 42 concentrically arranged with a predetermined radial air gap radially outward of the stator 41, and a predetermined inner diameter of the stator 41. The inner rotor 43 is concentrically arranged with a radial air gap.

The stator 41 includes an armature core 44 arranged in an annular shape, an armature winding 46 wound around a yoke 45 of the armature core 44 extending in the axial direction indicated by an arrow C, the armature core 44 and the electric machine The child winding 46 is covered with a resin mold 47 to make an annular shape,
The outer peripheral surface of the annular stator 41 is fitted into the housing 10, and the stator 41 is accommodated in the housing 10 so as to be capable of axial stroke but not to rotate.

The outer rotor 42 positioned radially outward of the stator 41 is configured by providing permanent magnet rows 13-1 and 13-2 at locations on the inner peripheral surface of the stator 41 facing the armature core 44.
Each of the permanent magnet arrays 13-1 and 13-2 is constituted by alternately arranging the N pole permanent magnets and the S pole permanent magnets in the circumferential direction, like the permanent magnet array 13 shown in FIG. The salient pole ratio of the rotor 2 is made relatively small so that there is no gap between the pole permanent magnet and the S pole permanent magnet.
The outer rotor 42 is supported on the rotor shaft 11, and at this time, the rotor 2 is rotationally engaged on the rotor shaft 11 so as not to be axially displaceable.

The inner rotor 43 positioned radially inward of the stator 41 is configured by providing salient pole rows 16-1 and 16-2 on the outer peripheral surface of the stator 41 facing the armature core 44.
Each of the salient pole rows 16-1 and 16-2 is formed by alternately arranging convex poles and concave portions in the circumferential direction, like the salient pole row 16 shown in FIG. The ratio is made larger than the salient pole ratio of the outer rotor 42.
The rotor 43 is supported on the rotor shaft 11. At this time, the rotor 43 is rotationally engaged with the rotor shaft 11 and supported so as not to be displaced in the axial direction.

The housing 10 is provided with an actuator 48 for causing the annular stator 41 to stroke in the axial direction within the housing 10.
Then, when the stator 47 is stroked to the left in FIG. 5 by the actuator 48, the magnetic short-circuit protrusion 50 is provided on the shoulder surface 49 of the stator 41 approaching the outer rotor.
When the stator 47 is stroked to the left in FIG. 5 by the actuator 48, the protrusion 50 approaches the outer rotor 42 and magnetically shorts the outer rotor 42 to cause a field change.

The operation of the variable characteristic rotating electrical machine according to the fifth embodiment will be described below.
When driving the rotating electrical machine of this embodiment, a current is supplied to the armature winding 46 of the stator 41.
At this time, a magnetic path αm having a field by the permanent magnet arrays 13-1 and 13-2 is generated between the stator 41 and the outer rotor 42, and a permanent magnet is included between the stator 41 and the inner rotor 43. An axial magnetic path αr having a field due to the no salient pole rows 16-1 and 16-2 is generated.

  By the way, in the present embodiment, the unique configuration of the stator yoke 45 (armature winding 46) described above, the unique configuration of the permanent magnet rows 13-1 and 13-2 related to the outer rotor 42, and the inner rotor Due to the unique arrangement of the salient pole rows 16-1 and 16-2 related to 43, the magnetic paths αm and αr are shortened, the iron loss is reduced, and the efficiency of the rotating electrical machine can be improved.

When the rotating electric machine rotates at a low speed, the actuator 41 keeps the stator 41 at the stroke position shown in the figure.
At this time, the magnetic short-circuit projection 50 is separated from the outer rotor 42 so that an air gap for low-speed rotation exists between the outer rotor 42 having a small salient pole ratio.

In this case, the induction torque Tm by the field including the permanent magnet rows 13-1 and 13-2 (by the induction motor) and the salient pole rows 16-1 and 16 not including the permanent magnet rows 13-1 and 13-2 The reluctance torque Tr due to the field via -2 (by the reluctance motor) is shown by a one-dot chain line and a two-dot chain line in FIG. It ’s like an example,
The total output torque Ttotal (= Tm + Tr) of the rotating electrical machine, which is the sum of these values, is as shown by the solid line in FIG. 6 (a).

On the other hand, during high-speed rotation when the induced voltage increases, the actuator 48 strokes the stator 41 from the position shown in the figure to the left in the figure, and the magnetic short-circuit projection 50 is brought close to the outer rotor 42 having a small salient pole ratio. The air gap between the two is made small for high speed rotation.
At this time, the magnetic short-circuit protrusion 50 can magnetically short-circuit the outer rotor 42 when approaching the outer rotor 42, and can reduce the induced voltage during high-speed rotation by reducing the no-load magnetic flux.

Incidentally, in this case, the induction torque Tm caused by the field including the permanent magnet rows 13-1 and 13-2 and the salient pole rows 16-1 and 16-2 not including the permanent magnet rows 13-1 and 13-2 are used. The reluctance torque Tr due to the magnetic field is as shown by the one-dot chain line and the two-dot chain line in FIG. 6 (b) with respect to the electrical angle β of the current supplied to the armature winding 46,
The total output torque Ttotal (= Tm + Tr) of the rotating electrical machine, which is the sum of these values, is as shown by a broken line in FIG. 6 (b).

However, when reducing the induced voltage, only the outer rotor 42 having a small salient pole ratio is magnetically short-circuited, and the magnetic field of the inner rotor 43 is not changed.
As is clear from the comparison between the two-dot chain line in FIG. 6 (a) and the two-dot chain line in FIG. 6 (b), the decrease of the reluctance torque Tr from before the magnetic short circuit to after the magnetic short circuit can be suppressed. ,
The decrease in the overall output torque Ttotal of the rotating electrical machine from before the magnetic short-circuit to after the magnetic short-circuit can be suppressed to the level from the solid line level in FIG. 6 (c) to the broken line level.

1,41 stator
2,3,42,43 Rotor
4,21,31,44 Armature core
5, 5-1,5-2,6, 6-1,6-2,22,32,45 Yoke
7, 7-1,7-2,8,8-1,8-2,23,33,46 Armature winding
9,24,34,47 Resin mold
10 Housing
11 Rotor shaft
12,15 Rotating field core
13,13-1,13-2 Permanent magnet array
14,50 Magnetic short-circuit projection
16 Salient pole array
48 Actuator

Claims (5)

A stator having a predetermined air gap and concentrically arranged, and at least two rotors,
In the variable characteristic rotating electrical machine in which the rotor is magnetically short-circuited and the characteristics are changed by the magnetic field change accompanying this,
Different salient pole ratios between the rotors,
Between the rotor of one of these rotors and the stator, a field is formed by a permanent magnet, and a magnetic path passing through the yoke of the stator is formed to generate an induction torque.
A field that does not include a permanent magnet is formed between the other rotor and the stator, and a magnetic path that passes through the yoke of the stator is formed to generate reluctance torque.
A variable characteristic rotating electric machine characterized in that only one of the rotors having different salient pole ratios is magnetically short-circuited to cause the characteristic change. In the variable characteristic rotating electrical machine according to claim 1,
The variable characteristic rotating electric machine according to claim 1, wherein a yoke of the stator extends in an axial direction or a radial direction of the stator to form the magnetic path in the yoke extending direction. In the variable characteristic rotating electrical machine according to claim 2,
When the stator yoke extends in the axial direction of the stator, the stator winding is wound so as to circulate in the axial direction;
When the yoke of the stator extends in the radial direction of the stator, the variable characteristic rotating electric machine is characterized in that the winding of the stator is wound around the radial direction. In the variable characteristic rotating electrical machine according to claim 1,
The variable characteristic rotating electric machine according to claim 1, wherein the winding of the stator is a toroidal winding wound around the yoke of the stator. In the variable characteristic rotating electrical machine according to any one of claims 1 to 4,
A variable characteristic rotating electrical machine configured to increase the β angle of the current supplied to the winding of the stator as the induction torque decreases.

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