JP2001197711A - Compound rotating electronic machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a compound rotating electric machine which has a winder operating range and prevents deterioration of permanent magnets used for its rotor, by reducing torque variation caused by reluctance torque of a nonexcited compound. SOLUTION: An internal rotor control part 33 obtains a rear torque τi of an internal rotor 7 on the basis of a current ifi detected by a current sensor 31 and a q-axis current iq computed by a stator control part 25, and computes a command field current ifi which makes the rear torque τi equal to a given internal torque command Ti. Besides, the command field current ifi is converter into ON/OFF duties Ton, Toff, and they are outputted to a boosting/deboosting chopper 35. From the chopper 35, current is supplied to internal field windings Li1-Li4 formed in the internal rotor 7.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a composite rotating electric machine that drives two rotors with one stator and a composite rotating electric machine that connects two rotors in cascade.

[0002]

2. Description of the Related Art Conventionally, as a complex rotating electric machine in which one stator drives two rotors, Japanese Patent Application No. 10-3233 is disclosed.
No. 42 has proposed a “rotating electric machine”. In a conventional composite rotating electric machine, as shown in FIG.
03 and the outer rotor 205 are embedded with permanent magnets having different numbers of pole pairs, respectively. In order to control each of the rotors independently, a plurality of single coils 209 constituting the stator 207 are independently expressed by a sine wave function. Drive current. Specifically, the torque control of the two rotors was controlled completely independently of each other.

[0003]

However, the spatial distribution of the inductance generated in the stator is largely distorted, and even if the field control is performed by controlling the current of the magnetic flux of the two rotors, the reluctance corresponding to the non-excitation. It is conceivable that the torque fluctuation due to the torque becomes large and the operating range of the rotating electric machine is actually narrowed. When rotating,
When the permanent magnets embedded on the two rotors are located at positions opposing each other, the demagnetizing action of the permanent magnets is promoted and deteriorated.

[0004] The present invention has been made in view of the above,
The purpose is to reduce the torque fluctuation due to the reluctance torque of the non-excited state, and the operating range is widened, and
An object of the present invention is to provide a composite rotating electric machine that can prevent deterioration of a permanent magnet used for a rotor.

[0005]

According to the first aspect of the present invention,
In order to solve the above-mentioned problems, a triple structure including two rotors provided on an inner circumference and an outer circumference of a stator and connected to different rotating shafts is provided. In a composite rotating electric machine in which a composite current flows so as to generate the same number of rotating magnetic fields as the number of the rotors, at least one or more of the rotors has a field winding.

According to a second aspect of the present invention, in order to solve the above problem, the field winding is connected to a slip ring provided on a rotating shaft of the rotor.

According to a third aspect of the present invention, in order to solve the above problems, the field winding is characterized in that a combination of the number of pole pairs generated on the rotor can be changed.

According to a fourth aspect of the present invention, there is provided a triple structure comprising an inner rotor and an outer rotor provided on the inner and outer circumferences of the stator and connected to different rotating shafts. A composite rotating electric machine in which one coil is formed and a composite current is caused to flow in the single coil so that a rotating magnetic field of the same number as the number of the inner rotor and the outer rotor is generated, wherein the outer rotor has a rotating shaft. The gist is made of a magnetic material having a claw shape in the direction, and has a pair of field windings at both ends on the outer periphery of the outer rotor.

According to a fifth aspect of the present invention, in order to solve the above-mentioned problems, two rotating electric machines having an outer rotor provided on an outer periphery of a stator and connected to a rotating shaft are cascade-connected so as to be independently rotatable. In a composite rotating electric machine in which a single coil is formed in the stator and a composite current is caused to flow so that the same number of rotating magnetic fields as the number of the outer rotors are generated in the single coil, the outer rotor rotates. The gist of the present invention is that a pair of field windings are formed at both ends of the outer periphery of the outer rotor connected in cascade with a claw shape in the axial direction.

According to a sixth aspect of the present invention, there is provided a DC power supply for supplying a DC power to the field winding.

[0011]

According to the first aspect of the present invention, there is provided a triple structure including two rotors provided on the inner and outer circumferences of the stator and connected to different rotating shafts, and a single coil is formed on the stator. Then, a composite current is caused to flow in the single coil so as to generate the same number of rotating magnetic fields as the number of rotors, and at least one or more rotors have a field winding, so that , A controllable magnetic field can be generated from the field winding, and the torque fluctuation due to the reluctance torque corresponding to the non-excitation can be reduced, and the operating range can be widened.

According to the second aspect of the present invention, the field winding is connected to the slip ring provided on the rotating shaft of the rotor, so that the field current is applied to the rotating field winding. Can be supplied.

According to the third aspect of the present invention, the field winding can change the combination of the number of pole pairs generated on the rotor, so that the two rotors operate with exactly the same rotational characteristics. Even in this case, it can be operated with very low loss. In addition, it is possible to reduce the torque fluctuation due to the reluctance torque corresponding to the non-excitation, thereby expanding the operation range.
In addition, the deterioration of the permanent magnet provided on the rotor can be prevented.

According to the present invention, the outer rotor is made of a magnetic material having a claw shape with respect to the rotation axis direction, and a pair of field windings is provided at both ends on the outer periphery of the outer rotor. By having the wire, a field current is supplied to the pair of field windings to excite the magnetic body, so that a pair of magnetic poles can be formed in the rotation axis direction, and the magnetic body has a claw shape. Therefore, a magnetic pole can be formed on the outer rotor. As a result, the torque fluctuation due to the reluctance torque for the non-excitation can be reduced, and the operation range can be widened.

According to the fifth aspect of the present invention, the outer rotor is made of a magnetic material having a claw shape with respect to the rotation axis direction, and a pair of outer rotors is provided at both ends of the outer periphery of the cascade-connected outer rotor. By exciting the magnetic material by supplying a field current to the pair of field windings, a pair of magnetic poles can be formed on each outer rotor in the rotation axis direction. Since the magnetic body has a claw shape, a magnetic pole can be formed on each outer rotor. As a result, the torque fluctuation due to the reluctance torque for the non-excitation can be reduced, and the operation range can be widened.

According to the present invention, a DC power supply for supplying DC power to the field winding is provided.
The field winding can be excited only during the operation of the rotating electric machine, and deterioration of the permanent magnet used for the rotor can be prevented.

[0017]

Embodiments of the present invention will be described below with reference to the drawings. (First Embodiment) FIG. 1 is a sectional view showing a configuration of a composite rotating electric machine 1 according to a first embodiment of the present invention. In FIG. 1, a composite rotating electric machine 1 includes a stator 3 including a plurality of single coils (hereinafter, referred to as coils), an outer rotor 5 with a predetermined gap between an outer periphery and an inner periphery of the cylindrical stator 3. The inner rotor 7 and the inner rotor 7 are arranged to have a triple structure, and the outer rotor 5 and the inner rotor 7 are provided rotatably with respect to the outer frame to be covered.

The inner rotor 7 has an inner field winding L
The outer rotor 5 has two pairs of outer field windings Lo1 to Lo4 such that the outer rotor 5 has twice the number of poles per pole of the inner rotor 7. Are arranged. The stator 3 is composed of three coils 9 per magnetic pole of the outer rotor 5,
Two (= 3 × 4) coils 9 are equally arranged on the same circumference. Reference numeral 11 denotes a core around which the coil is wound, and the same number of cores 11 as the coil 9 are arranged on the circumference at regular intervals (gap) 13.

Next, FIG. 2 is a diagram showing the configuration of the inner rotating shaft 15 of the composite rotating electric machine 1. In the figure, an inner rotating shaft 15 has inner field windings Li1, L connected in series.
Slip rings SL1 and SL2 for supplying power from a step-up / step-down chopper described later are connected to i2.

Next, FIG. 3 is a diagram showing a configuration of the outer rotating shaft 17 of the composite rotating electric machine 1. In the figure, the outer rotating shaft 17 has outer field windings Lo <b> 1 to L <b> 1 connected in series.
O4 is connected to slip rings SL3 and SL4 for supplying power from a step-up / step-down chopper described later.

Next, FIG. 4 is a side sectional view of the composite electric rotating machine 1 and a block diagram showing a control device 24 for controlling the composite electric rotating machine 1. In order to rotate the respective rotors 5 and 7 synchronously, the composite rotary electric machine 1
Outer rotor position sensor 21 and outer rotor position sensor 2 for detecting the rotor position represented by each rotational phase θo, θi
3 are provided, and pulse signals from these sensors 21 and 23 are input to the stator control unit 25.

The stator control unit 25 is based on the outer torque command value To and the inner torque command value Ti given to the outer rotor 5 and the inner rotor 7, and the rotor positions θo and θi of the outer rotor 5 and the inner rotor 7, respectively. And the outer rotor 5
A PWM signal is generated as a composite current command value so that a rotating magnetic field is generated between the inner rotor 7 and the stator 3. Further, the stator control unit 25 calculates the q-axis current iq based on the output currents i1 to i12 of the respective phases, and supplies the calculated current to the inner rotor control unit 33 and the outer rotor control unit 39.

The multi-phase inverter 27 includes a stator control unit 2
5 based on the PWM signal given from
Is converted into an alternating current, and composite currents 1 to I12 are supplied to the coil 9 provided on the stator 3. Since the sum of all the instantaneous currents of the composite currents I1 to I12 is 0, the Kome inverter 27 is equivalent to a normal three-phase bridge type inverter having 12 phases, and has the same number as 24 transistors. It is composed of diodes. A current sensor is provided at each output terminal of the bridge type inverter of each phase, and outputs the output currents i1 to i12 to the stator control unit 25.

The current sensor 31 is connected to brushes Br1, Br2, slip rings SL1, SL from the step-up / step-down chopper 35.
2, the inner field winding Li provided on the inner rotor 7 via
1, a current ifi supplied to Li2 is detected. The inner rotor control unit 33 outputs the current ifi detected by the current sensor 31.
And a command field current ifi based on the q-axis current iq calculated by the stator control unit 25, and further converts the command field current ifi into ON / OFF duties Ton and Toff to convert the step-up / step-down chopper 35.

The step-up / step-down chopper 35 includes ON / OFF duties Ton and Tof given from the inner rotor control unit 33.
f, controlling a plurality of transistors provided therein to perform a step-up operation or a step-down operation with respect to the voltage supplied from the battery 29, and to reduce the output current to the slip ring SL.
1 and SL2 to the inner field windings Li1 and Li2 provided on the inner rotor 7. The current sensor 3
7, the configuration of the outer rotor control unit 39 and the step-up / step-down chopper 41 are the same as those of the current sensor 31, the outer rotor control unit 33,
Since the configuration is the same as that of the step-up / step-down chopper 35,
The description is omitted.

Next, with reference to FIG. 4, the operation of the composite rotating electric machine 1 and the control device 24 will be described.

First, at the time of startup, the inner rotor control unit 33
Sets a predetermined initial value for the command field current ifi, and further turns ON / OFF the command field current ifi.
The duty ratio is converted to Ton and Toff, and the step-up / step-down chopper 35
Output to

The step-up / step-down chopper 35 is provided with an ON / OFF duty T given from the inner rotor controller 33.
A plurality of transistors provided inside are controlled in accordance with on and Toff, and a voltage supplied from the battery 29 is stepped up or stepped down to output an output current of the brush Br.
1 and Br2, and supply them to the inner field windings Li1 and Li2 provided on the inner rotor 7 via the slip rings SL1 and SL2. As a result, a current is supplied to the inner field windings Li1 and Li2 provided on the inner rotor 7, and the respective field windings are excited to, for example, S and N poles.

Similarly, at the time of startup, the outer rotor control unit 3
9 sets a predetermined initial value for the command field current ifo, and further sets the command field current ifo to ON / OF.
Step up / down chopper 4
Output to 1.

The step-up / step-down chopper 41 uses the ON / OFF duty T given by the outer rotor control unit 39.
A plurality of transistors provided inside are controlled in accordance with on and Toff, and a voltage supplied from the battery 29 is stepped up or stepped down to output an output current of the brush Br.
3, Br4 and the outer field windings Lo1 to Lo4 provided on the outer rotor 5 via the slip rings SL3 and SL4. As a result, a current is supplied to the outer field windings Lo1 to Lo4 provided on the outer rotor 5, and the respective field windings are excited to, for example, S pole, N pole, S pole, and N pole.

At the same time, the stator control unit 25 determines the outer torque command value To and the inner torque command value Ti given to the outer rotor 5 and the inner rotor 7, and the rotor positions θo and θi of the outer rotor 5 and the inner rotor 7, respectively. Is set as a composite current command value such that a rotating magnetic field is generated between the outer rotor 5 and the inner rotor 7 and the stator 3 on the basis of
Generate an M signal.

The multi-phase inverter 27 converts a DC current supplied from the battery 29 into an AC current based on the PWM signal supplied from the stator control unit 25,
The composite current 1 to I12 is applied to the coil 9 provided on the stator 3.
Supply. As a result, a rotating magnetic field is generated between the excited outer rotor 5 and inner rotor 7 and the stator 3, respectively, and the outer rotor 5 and the inner rotor 7 respectively start rotating.

Here, since current sensors are provided at the output terminals of the bridge type inverters of each phase provided in the multi-phase inverter 27, the output currents i1 to i12 are output from these current sensors to the stator control section. 25. Then, the stator control unit 25 outputs the output current i
The q-axis current iq is calculated based on 1 to i12, and given to the inner rotor controller 33 and the outer rotor controller 39. The q-axis current iq is calculated for a d-axis parallel to the magnetic pole direction and a q-axis orthogonal to the magnetic pole direction.

Then, the inner rotor control unit 33 controls the current ifi detected by the current sensor 31 and the stator control unit 25
The actual torque τi of the inner rotor 7 is obtained based on the q-axis current iq calculated by

Τi ∝ifi × iq Then, a command field current ifi is calculated such that the actual torque τi is equal to the inner torque command value Ti given to the inner rotor 7, and further this command field current is calculated. ifi ON /
The duty ratio is converted to the OFF duty Ton and Toff and output to the step-up / step-down chopper 35. Then, a current is supplied from the step-up / step-down chopper 35 to the inner field windings Li1 to Li4 provided on the inner rotor 7, and the magnetic fields of the respective field windings are changed. As a result, the inner rotor 7 receives the inner torque command. Value Ti
It will rotate according to.

Further, the outer rotor control section 39 obtains the actual torque τo of the outer rotor 5 based on the current ifo detected by the current sensor 37 and the q-axis current iq calculated by the stator control section 25.

[0036]

Τo ∝ifo × iq Then, a command field current ifo is calculated such that the actual torque τo is equal to the outer torque command value To given to the outer rotor 5, and further, this command field current is calculated. ON ifo /
The duty ratio is converted to OFF duty Ton and Toff and output to the step-up / step-down chopper 41. Then, a current is supplied from the step-up / step-down chopper 41 to the outer field windings Lo1 to Lo4 provided on the outer rotor 5, and the magnetic fields generated by the respective field windings are changed. As a result, the outer rotor 5 receives the outer torque command. Value To
It will rotate according to.

An advantage of the first embodiment of the present invention is that at least one or more rotors have a field winding so that a controllable magnetic field is generated from the field winding on the rotor. Thus, the torque fluctuation due to the reluctance torque for the non-excitation can be reduced, and the operating range can be widened. The field winding is connected to a slip ring provided on the rotating shaft of the rotor, so that a field current can be supplied to the rotating field winding.

(Second Embodiment) FIG. 5 is a sectional view showing a configuration of a composite rotating electric machine 51 according to a second embodiment of the present invention. Note that the second embodiment has the same basic configuration as the composite rotating electric machine 1 corresponding to the first embodiment shown in FIG. 1, and the same components are denoted by the same reference numerals. The description is omitted.

In the figure, a composite rotating electric machine 51 includes a stator 3 composed of a plurality of single coils (hereinafter, referred to as coils), and a predetermined gap between the outer circumference and the inner circumference of the cylindrical stator 3. The outer rotor 55 and the inner rotor 57 are disposed to have a triple structure, and the outer rotor 55 and the inner rotor 57 are provided.
Is rotatably provided with respect to the outer frame to be covered.
The inner rotor 57 is formed of two pairs of permanent magnets, while the outer rotor 55 has salient poles formed of eight pairs of permanent magnets and outer field windings Lo1 to Lo4.

FIG. 6 is a diagram showing the configuration of the outer rotating shaft 59 of the composite rotating electric machine 51. As shown in FIG.

In the figure, slip rings SL1 and SL2 for supplying power from a step-up / down chopper to be described later to outer field windings Lo1 and Lo3 connected in series are connected to the outer rotating shaft 59. And slip rings SL3 and SL4 for supplying power from a step-up / down chopper to be described later to outer field windings Lo2 and Lo4 connected in series.
Is connected. Therefore, the outer field windings Lo1, Lo
3 are excited to the same polarity, and the outer field windings Lo2 and Lo4 are excited to the same polarity.

FIG. 7 is a side sectional view of the composite rotating electric machine 51 and a control device 61 for controlling the composite rotating electric machine 51.
FIG. SW1 is a switch for switching the combination of the polarity of the voltage applied to each outer field winding.

The connection portion 63 is provided between the step-up / step-down chopper 41 and the brushes Br1 to Br4, and switches the polarity of the voltage applied to each outer field winding of the outer rotor 55 according to the setting state of SW1.

Here, the relationship between the setting state of SW1 and the polarity of the voltage applied to each outer field winding of the outer rotor 55 will be described with reference to FIG. When SW1 is in the open state and becomes logic (1), the brush Br is
The polarities of the voltages output to 1 to Br4 are as shown in FIG. As a result, the outer field windings Lo1 to Lo4 are excited to S pole, N pole, S pole, and N pole, respectively. Here, the permanent magnets on both sides of the outer field windings Lo1 to Lo4 have magnetic poles of S pole, N pole, S pole, and N pole, respectively, so that the number of pole pairs of the outer rotor 55 is four pole pairs.

On the other hand, the switch SW1 is grounded and the logic (0) is set.
In this case, the polarity of the voltage output from the connection unit 63 to the brushes Br1 to Br4 is as shown in FIG. As a result, the outer field windings Lo1 to Lo4 have N pole and S pole, respectively.
, N and S poles. Here, the outer field winding L
The permanent magnets on both sides of o1 to Lo4 have S pole and N pole respectively.
Poles, S poles, and N poles.
Is 12 pole pairs.

The description of the operations of the composite rotating electric machine 51 and the control device 61 is the same as the operation of the composite rotating electric machine 1 and the control device 24 described in the first embodiment, and therefore will not be repeated. And In the second embodiment, the case where the number of pole pairs of the outer field winding provided on the outer rotor 55 is changed has been described. However, the present invention is not limited to such a case. The rotor 57 may be provided with an inner field winding and the number of pole pairs may be changed in the same manner.

An advantage of the second embodiment of the present invention is that the field winding provided on the rotor is connected to a slip ring provided on the rotating shaft of the rotor.
A field current can be supplied to the rotating field winding.

The field winding provided on the rotor is
Since the combination of the number of pole pairs generated on the rotors can be changed, it is possible to operate the two rotors with extremely low loss even when they operate with exactly the same rotational characteristics.
Further, it is possible to reduce the torque fluctuation due to the reluctance torque corresponding to the non-excitation, expand the operation range, and prevent deterioration of the permanent magnet provided on the rotor.

(Third Embodiment) FIG. 9 is a sectional view showing a configuration of a complex rotating electric machine 71 according to a third embodiment of the present invention. Note that the third embodiment has the same basic configuration as the composite rotating electric machine 1 corresponding to the first embodiment shown in FIG. 1, and the same components are denoted by the same reference numerals. The description is omitted.

In the figure, a composite rotating electric machine 71 has a stator 3 composed of a plurality of single coils (hereinafter, referred to as coils), and a predetermined gap between the outer circumference and the inner circumference of the cylindrical stator 3. The outer rotors 75 and 77 and the inner rotor 73 are arranged to have a triple structure, and the outer rotors 75 and 77 and the inner rotor 73 are rotatably provided.

The inner rotor 73 is formed of a pair of permanent magnets, while the outer rotors 75 and 77 are provided with six pairs of magnetic bodies A and A '.

Next, FIG. 10 is a sectional view of the composite rotating electric machine 71 in the direction of the rotation axis. The six pairs of magnetic bodies A and A 'disposed on the outer rotors 75 and 77 are provided with comb-shaped convex portions and concave portions, respectively.
Have a claw-shaped configuration in which the respective convex portions and concave portions are alternately arranged with a gap of a magnetically unaffected degree. Further, a narrow gap is formed between the stator 3 and the outer rotors 75 and 77 to such an extent that it is magnetically affected.

Next, FIG. 11 is a side sectional view of the composite rotating electric machine 71 and a control device 8 for controlling the composite rotating electric machine 71.
FIG. The stator 3 is fixed to a case (not shown), and the coils 9 provided inside the stator 3 are connected to output terminals of the multi-phase inverter 27, respectively. The rotation axis of the inner rotor 73 is
It is rotatably supported by the stator 3 via bearings 79a and 81a. Similarly, the rotating shafts of the outer rotors 75 and 77 are rotatably supported by the stator 3 via bearings 79b and 81b. The outer rotor 7
The rotation shafts 5 and 77 are rotatably supported by a case (not shown) via a bearing (not shown).

The excitation windings L11 and L12 are connected to the outer rotor 7
A pair of coils arranged on the outer periphery of 5,77
The excitation windings L11 and L12 are connected to a step-up / step-down chopper 41. The excitation winding controller 85 calculates a command field current ifo based on the current ifo detected by the current sensor 37 and the q-axis current iq calculated by the stator controller 25,
Further, the command field current ifo is converted into ON / OFF duties Ton and Toff and output to the step-up / step-down chopper 41.

Next, referring to FIG.
The flow direction of the magnetic flux in the outer rotors 75 and 73 provided on 1 will be described. As shown in FIG. 10, the excitation winding L1
When an exciting current is applied from the step-up / step-down chopper 41 to L1 and L12, they are excited to generate a magnetic flux in the direction of the arrow.
The magnetic flux generated in the field winding L11 is
A gap between the outer rotor 75 and the stator 3, a gap between the stator 3, the stator 3 and the outer rotor 77,
The magnetic flux is transmitted to the exciting winding L12 via the outer rotor 77 to form a magnetic flux loop. As a result, the outer rotor 75 is excited to the N-pole, the outer rotor 77 is excited to the S-pole, and in the entire outer rotor, the S-pole and the N-pole are alternately excited by six pole pairs.

Next, referring to FIG.
1 and the operation of the control device 83 will be described. First, at the time of startup, the excitation winding control unit 85 sets a predetermined initial value for the command field current ifo, and further converts the command field current ifo into ON / OFF duties Ton and Toff. And outputs it to the step-up / step-down chopper 41.

The step-up / step-down chopper 41 outputs the ON / OFF duty To given by the excitation winding controller 85.
A plurality of transistors provided inside are controlled in accordance with n and Toff, and the voltage supplied from the battery 29 is stepped up or stepped down to output current to the outer rotor 7.
5, 77 are supplied to the excitation windings L11 and L12. As a result, a current is supplied to the excitation windings L11 and L12 provided on the outer rotors 75 and 77, and the respective excitation windings are excited, and the outer rotors 75 and 77 made of a magnetic material are excited.
Are excited to the N and S poles, respectively.

At the same time, the stator controller 25 controls the outer and inner rotors 75 and 77 and the inner and outer rotors 73 and 73, and the rotors of the outer and inner rotors 75 and 77 and 73, respectively. Position θo,
Based on θi, a PWM signal is generated as a composite current command value such that a rotating magnetic field is generated between the outer rotor 75 and the inner rotor 73 and the stator 3, respectively.

The multi-phase inverter 27 converts the DC current supplied from the battery 29 into an AC current based on the PWM signal given from the stator control unit 25,
The composite current 1 to I12 is applied to the coil 9 provided on the stator 3.
Supply. As a result, a rotating magnetic field is generated between the excited outer rotors 75 and 77 and the inner rotor 73 and the stator 3, respectively, and the outer rotors 75 and 77 and the inner rotor 73 start rotating, respectively.

Here, current sensors are provided at the output terminals of the bridge type inverters of the respective phases provided in the multi-phase inverter 27. The output currents i1 to i12 are output from these current sensors to the stator control unit. 25.

Then, the stator control unit 25 calculates a q-axis current iq based on the output currents i 1 to i 12 of the respective phases, and supplies it to the exciting winding control unit 85.

The exciting winding control unit 85 obtains the actual torque τo of the outer rotor 5 based on the current ifo detected by the current sensor 37 and the q-axis current iq calculated by the stator control unit 25. .

[0063]

Τo ∝ifo × iq Then, a command field current ifo is calculated such that the actual torque τo is equal to the outer torque command value To given to the outer rotors 75 and 77. Magnetic current ifo
Is converted into ON / OFF duties Ton and Toff and output to the step-up / step-down chopper 41. And the buck-boost chopper 4
1 to the excitation winding L1 provided on the outer rotors 75 and 77
1, L12 is supplied with a current, and the magnetic field generated by each excitation winding is changed. As a result, the outer rotors 75, 77 rotate according to the outer torque command value To.

The effect of the third embodiment of the present invention is that the outer rotor is made of a magnetic material having a claw shape with respect to the rotation axis direction, and a pair of magnetic fields is provided at both ends on the outer periphery of the outer rotor. By having the windings, a field current is supplied to the pair of field windings to excite the magnetic body, so that a pair of magnetic poles can be formed in the rotation axis direction, and the magnetic body has a claw shape. As a result, a magnetic pole can be formed on the outer rotor. As a result, the torque fluctuation due to the reluctance torque for the non-excitation can be reduced, and the operation range can be widened.

Further, by having a step-up / step-down chopper for supplying DC power to the field winding, the field winding can be excited only during operation of the rotating electric machine, thereby preventing deterioration of the permanent magnet used for the rotor. be able to.

(Fourth Embodiment) FIG. 12 is a sectional view showing a configuration of a composite rotating electric machine 91 according to a fourth embodiment of the present invention. Note that the fourth embodiment has the same basic configuration as the composite rotating electric machine 71 corresponding to the third embodiment shown in FIG. 9, and the same components are denoted by the same reference numerals. The description is omitted.

In the figure, a composite rotating electric machine 91 includes a first rotor 3 having a plurality of single coils (hereinafter, referred to as coils) and a first rotor 3 having a predetermined gap formed around the outer periphery of the cylindrical stator 3. 93A and 93A 'are arranged to provide a double structure. In the first rotor 93A, 93A ', six pairs of magnetic bodies A, A' are arranged.

FIG. 13 is a side sectional view of the composite rotating electric machine 91 and a control device 1 for controlling the composite rotating electric machine 91.
It is a block diagram which shows 07. In the figure, a composite rotating electric machine 91 includes a first rotating electric machine 91a and a second rotating electric machine 91b.
, And both rotate independently.

The stator 3 is fixed to a case (not shown), and the coils 9 provided inside the stator 3 are connected to output terminals of the multi-phase inverter 27, respectively. The rotating shafts of the first rotors 93A and 93A 'are rotatably supported by the stator 3 via bearings 95. The rotating shafts of the first rotors 93A and 93A 'are connected to a case (not shown) via a bearing (not shown).
It is assumed that it is supported rotatably.

The basic structure of the second rotating electric machine 91b is the first rotating electric machine 91b.
Since it has the same structure as the rotating electric machine 91a,
Only the differences between the two will be described. First rotating electric machine 9
1a of the first rotor 93A ′ and the second rotating electric machine 91b of the second
A concave magnetic coupling portion 99a made of a magnetic material and rotating integrally with the first rotor 93A 'is provided between the rotor 101B' and the rotor 101B ', and integrally formed with the second rotor 101B' and rotating. A convex magnetic coupling portion 99b is provided. A gap is provided between the magnetic coupling portions 99a and 99b so that the first rotor 93A 'and the second rotor 101B' can be magnetically coupled and can rotate independently of each other. Further, the magnetic coupling parts 99a, 99
The rotating shaft 9b is rotatably supported by a case (not shown) via a bearing (not shown).

The exciting windings L11 and L12 are respectively connected to the first windings.
The pair of coils is a pair of coils arranged on the outer periphery of the rotor 93A and the second rotor 101B, and the excitation windings L11 and L12 are connected to the step-up / step-down chopper 41. Excitation winding control unit 1
13 is a current ifo detected by the current sensor 37 and a q-axis current iq calculated by the stator control units 109 and 111.
A command field current ifo is calculated on the basis of 1,1q2, and the command field current ifo is further converted into ON / OFF duties Ton and Toff and output to the step-up / step-down chopper 41.

The stator control unit 109 includes the first rotating electric machine 9
1a based on the torque command value T1 given to the first rotor 93a and the rotor position θ1 of the first rotor 93A.
A PWM signal is generated as a composite current command value so that a rotating magnetic field is generated between A, 93A 'and the stator 3, respectively. In addition, the stator control unit 109 controls each phase output current i
The q-axis current iq1 is calculated based on 1 to i12, and given to the excitation winding control unit 113. Note that the configuration of the stator control unit 111 is the same as that of the stator control unit 109, and a description thereof will be omitted.

Next, the flow direction of the magnetic flux of the composite rotating electric machine 91 shown in FIG. 13 will be described. When an exciting current is applied to the exciting windings L11 and L12 from the step-up / step-down chopper 41, each is excited to generate a magnetic flux. The magnetic flux generated by the field winding L11 is transmitted to the first rotor 93A (N pole) and the first rotor 93A.
A, the gap between the stator 3, the stator 3, the gap between the stator 3 and the first rotor 93 A ′, the first rotor 93 A ′ (S pole), the magnetic coupling portion 99 a of the first rotor 93 A ′, the second Magnetic coupling portion 99b of rotor 101B ', second rotor 101B' (N pole), gap between second rotor 101B 'and stator 3, stator 3, stator 3
Is transmitted to the exciting winding L12 via the second rotor 101B and the second rotor 101B (S-pole) to form a magnetic flux loop. As a result, the first rotor 93A and the second rotor 101B
Are excited to the N pole, and the first rotor 93A 'and the second rotor 1
01B is excited to the S pole, and in the whole of the two rotating electric machines, the S pole and the N pole are alternately excited by 6 pole pairs.

Next, referring to FIG.
1 and the operation of the control device 107 will be described. First, at the time of startup, the excitation winding control unit 85 sets a predetermined initial value for the command field current ifo, and further converts the command field current ifo into ON / OFF duties Ton and Toff. And outputs it to the step-up / step-down chopper 41.

The step-up / step-down chopper 41 uses the ON / OFF duty T given from the exciting winding control unit 113.
A plurality of transistors provided inside are controlled according to on and Toff, and the voltage supplied from the battery 29 is stepped up or stepped down to output an output current to the first rotor 9.
3A, excitation winding L1 provided on second rotor 101B
1, supply to L12.

As a result, current is supplied to the excitation windings L11 and L12 provided on the first rotor 93A and the second rotor 101B, and the respective excitation windings are excited, and the first rotors 93A and 93A made of a magnetic material are excited. ', The second rotor 101
B ′ and 101B are excited to N-pole and S-pole, respectively.

At the same time, based on the torque command value T1 given to the rotating electric machine 91a and the rotor position θ1, the stator control section 25 generates a rotating magnetic field between the first rotors 93A, 93A 'and the stator 3. A PWM signal is generated as a composite current command value to be generated. The multi-phase inverter 27 is provided with a PWM signal supplied from the stator control unit 25.
Based on the signal, the DC current supplied from the battery 29 is converted into an AC current, and the coil 9 provided on the stator 3
Are supplied with composite currents 1 to I12.

As a result, between the excited first rotors 93A, 93A 'and the stator 3, the second rotor
A rotating magnetic field is generated between 1B, 101B 'and stator 3, respectively, and rotating electric machines 91a, 91b start rotating, respectively.

Here, current sensors are provided at the output terminals of the bridge type inverters of each phase provided in the multi-phase inverter 27, and the output currents i1 to i12 are output from these current sensors to the stator control section. 109, 11
1 is output.

Then, the stator control units 109 and 111
Is a q-axis current iq1, based on each phase output current i1 to i12.
iq2 is calculated and given to the excitation winding control unit 113.

Then, the exciting winding controller 113 compares the current ifo detected by the current sensor 37 with the stator controller 10.
Based on the q-axis currents iq1 and iq2 calculated in steps 9 and 111, the actual torques τ1 and τ2 of the rotary electric machines 91a and 91b are determined.
Ask for.

[0082]

Τ 1 ∝ifo × iq 1, τ 2 ∝ifo iq 2 Then, the command field current ifo such that the torque command values T 1 and T 2 given to the rotating electric machines 91 a and 91 b become the actual torques τ 1 and τ 2, respectively. Is calculated, and the command field current ifo is converted into ON / OFF duties Ton and Toff and output to the step-up / step-down chopper 41. Then, a current is supplied from the step-up / step-down chopper 41 to the exciting windings L11 and L12 provided in the rotating electric machines 91a and 91b, and the magnetic fields generated by the respective exciting windings are changed.
1a and 91b rotate according to the torque command values T1 and T2.

The effect of the fourth embodiment of the present invention is that the outer rotor is made of a magnetic material having a claw shape with respect to the rotation axis direction, and one end is provided at both ends of the outer periphery of the cascade-connected outer rotor. By having a pair of field windings, a field current is supplied to the pair of field windings to excite the magnetic material, so that a pair of magnetic poles can be formed on each outer rotor in the direction of the rotation axis. Since the magnetic body has a claw shape, a magnetic pole can be formed on each outer rotor. As a result, the torque fluctuation due to the reluctance torque for the non-excitation can be reduced, and the operation range can be widened.

Further, by providing a step-up / step-down chopper for supplying DC power to the field winding, the field winding can be excited only during operation of the rotating electric machine, thereby preventing deterioration of the permanent magnet used for the rotor. be able to.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view illustrating a configuration of a composite rotating electric machine 1 according to a first embodiment of the present invention.

FIG. 2 is a diagram showing a configuration of an inner rotating shaft 15 of the composite rotating electric machine 1.

FIG. 3 is a diagram showing a configuration of an outer rotating shaft 17 of the composite rotating electric machine 1.

FIG. 4 is a side sectional view of the composite rotating electric machine 1 and the composite rotating electric machine 1;
FIG. 2 is a block diagram showing a control device 24 for controlling the control.

FIG. 5 is a cross-sectional view illustrating a configuration of a compound rotating electric machine 51 according to a second embodiment of the present invention.

FIG. 6 is a diagram showing a configuration of an outer rotating shaft 59 of the composite rotating electric machine 51.

FIG. 7 is a side sectional view of the composite electric rotating machine 51 and a block diagram showing a control device 61 for controlling the composite electric rotating machine 51.

FIG. 8 is a diagram showing a relationship between a setting state of SW1 and a polarity of a voltage applied to each outer field winding of the outer rotor 55.

FIG. 9 is a cross-sectional view illustrating a configuration of a compound rotating electric machine 71 according to a third embodiment of the present invention.

FIG. 10 is a cross-sectional view of the composite rotating electric machine 71 in a rotation axis direction.

11 is a block diagram showing a side sectional view of the composite rotating electric machine 71 and a control device 83 for controlling the composite rotating electric machine 71. FIG.

FIG. 12 is a cross-sectional view illustrating a configuration of a compound rotating electric machine 91 according to a fourth embodiment of the present invention.

FIG. 13 is a side sectional view of the composite rotating electric machine 91 and a block diagram showing a control device 107 for controlling the composite rotating electric machine 91.

FIG. 14 is a cross-sectional view of a conventional composite electric rotating machine in a rotation axis direction.

[Explanation of symbols]

 1, 51, 71, 91 composite rotating electric machine 3 stator 5, 55, 73 outer rotor 7, 57, 75, 77 inner rotor 15 inner rotating shaft 17 outer rotating shaft 21 outer rotor position sensor 23 inner rotor position sensor 24, 61, 83, 107 control device 25, 109, 111 stator control unit 27 polyphase inverter 29 battery 31 current sensor 33 inner rotor control unit 35 step-up / step-down chopper 39 outer rotor control unit 91a, 91b rotating electric machine 97, 105 rotor position sensor Li1, Li2 Inner field winding Lo1 to Lo4 Outer field winding SL1, SL2, SL3, SL4 Slip ring

Claims (6)

[Claims] 1. A triple structure comprising two rotors provided on an inner circumference and an outer circumference of a stator and connected to different rotation shafts, a single coil is formed on the stator, and the rotor is mounted on the single coil. A composite rotating electric machine in which a composite current is caused to flow so as to generate the same number of rotating magnetic fields as in (1), wherein at least one or more of the rotors has a field winding. 2. The composite rotating electric machine according to claim 1, wherein said field winding is connected to a slip ring provided on a rotating shaft of said rotor. 3. The composite rotating electric machine according to claim 1, wherein the field winding can change a combination of the number of pole pairs generated on the rotor. 4. A triple structure comprising an inner rotor and an outer rotor provided on the inner and outer circumferences of the stator and connected to different rotating shafts, a single coil is formed on the stator, and the single coil is formed on the single coil. In a composite rotating electric machine wherein a composite current is caused to flow so as to generate the same number of rotating magnetic fields as the number of the inner rotor and the outer rotor, the outer rotor is made of a magnetic material having a claw shape with respect to a rotation axis direction. A composite rotating electric machine having a pair of field windings at both ends on the outer periphery of an outer rotor. 5. A rotating machine having an outer rotor provided on an outer periphery of a stator and connected to a rotating shaft is cascaded independently and rotatably, and a single coil is formed on the stator. In a composite rotating electric machine in which a composite current flows so as to generate the same number of rotating magnetic fields as the number of the outer rotors in one coil, the outer rotor is made of a magnetic material having a claw shape with respect to a rotation axis direction. A composite rotating electric machine having a pair of field windings at both ends of the outer periphery of an outer rotor connected in cascade. 6. The composite rotating electric machine according to claim 4, further comprising a DC power supply for supplying a DC power to the field winding.