JP3506084B2 - Compound rotating electric machine - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a composite rotary electric machine in which one stator drives two rotors, and a composite rotary electric machine in which two rotors are connected in cascade.

[0002]

2. Description of the Related Art Conventionally, Japanese Patent Application No. 10-3233 discloses a compound rotary electric machine in which one stator drives two rotors.
A "rotary electric machine" described in No. 42 has been proposed. In the conventional combined rotary electric machine, as shown in FIG.
03 and the outer rotor 205 are embedded with permanent magnets having different numbers of pole pairs, and in order to control each rotor independently, a plurality of single coils 209 constituting the stator 207 are independently represented by a sine wave function. Was given a drive current. Specifically, the torque control of the two rotors were controlled completely independently, respectively.

[0003]

However, the spatial distribution of the inductance generated in the stator is greatly distorted, and even if an attempt is made to control the field by controlling the magnetic flux components of the two rotors, the reluctance of the non-excited component will be obtained. It is conceivable that the torque fluctuation due to the torque increases and the operating range of the rotating electric machine is actually narrowed. Also, when rotating,
The permanent magnets embedded on the two rotors are paired with each other .
At the facing position, the demagnetizing action of the permanent magnet was promoted and deteriorated.

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 part, widen the operating range, 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]

The invention according to claim 1 is
In order to solve the above 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, and the stator has the two rotors.
A common coil for generating different rotating magnetic fields is formed, and a current corresponding to each rotor is applied to the common coil so that the same number of rotating magnetic fields as the number of rotors are generated.
In a composite rotating electric machine configured to flow combined composite current , at least one of the two rotors is
At least one pair of field windings are evenly arranged, and
The torque fluctuation due to reluctance torque is reduced.
Thus, the gist is to control the value of the current flowing through the field winding .

In order to solve the above-mentioned problems, a second aspect of the present invention is characterized in that the field winding is connected to a slip ring provided on a rotating shaft of the rotor.

In order to solve the above-mentioned problems, the invention according to claim 3 is summarized in that the field winding can change the combination of the number of pole pairs generated on the rotor.

In order to solve the above-mentioned problems, the invention according to claim 4 is provided with a triple structure including an inner rotor and an outer rotor which are provided on an inner circumference and an outer circumference of the stator and are connected to different rotating shafts, and the stator is provided with : For the two rotors
Form a common coil to generate separate rotating magnetic fields ,
Corresponding to each rotor so that the same number of rotating magnetic fields as the inner rotor and the outer rotor are generated in the common coil .
In the combined rotating electric machine in which a combined current is added , 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 magnets is provided at both ends of the outer rotor. Winding provided and reluctant stole
In order to reduce torque fluctuation due to
The point is to control the value of the current flowing through the winding .

In order to solve the above problems, the invention according to claim 5 independently rotatably cascade-connects two rotating electric machines each having an outer rotor provided on the outer periphery of the stator and connected to a rotating shaft, Two outsides on the stator
A common coil is formed to generate different rotating magnetic fields for the rotors, and the common coils are paired with the outer rotors so that the same number of rotating magnetic fields as the outer rotors are generated .
In the combined rotating electrical machine configured to flow a combined current including the corresponding currents, the outer rotor is made of a magnetic material having a claw shape with respect to the rotation axis direction, and both ends of the outer circumference of the outer rotors are connected in cascade. A pair of field windings is installed on the
And reduce torque fluctuation due to reluctance torque
To control the value of the current flowing through the pair of field windings.
And summarized in that that.

In order to solve the above-mentioned problems, the invention according to claim 6 has a direct current power supply for supplying direct current power to the field winding.

[0011]

According Effect of the Invention] The present invention according to claim 1, further comprising a triple structure consisting of two rotors that are connected to different rotational shaft provided on the inner periphery and outer periphery of the stator, the stator, 2
One of the form a common coil for generating a separate rotating magnetic field to the rotor, so that the rotational magnetic field equal to the number of rotor to said common coil generates a current corresponding to each rotor
Make sure to pass the combined combined current, and at least
Also one or more rotors have at least one pair of field windings
Since There are disposed equally, it is possible to generate a controllable magnetic field from the field winding on the rotor, can be operating range can reduce torque fluctuations due to reluctance torque of the non-excitation component is widely .

According to the second aspect of the present invention, the field winding is connected to a slip ring provided on the rotating shaft of the rotor, so that the field current flowing through the rotating field winding is increased. 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 rotors, so that the two rotors operate with exactly the same rotation characteristics. In this case, it can be operated with extremely low loss. In addition, it is possible to reduce the torque fluctuation due to the reluctance torque of the non-excited component and expand the operating range,
In addition, it is possible to prevent deterioration of the permanent magnet provided on the rotor.

According to the fourth 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 field windings are provided at both ends of the outer periphery of the outer rotor. By having the wires, 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, the magnetic poles can be formed on the outer rotor. As a result, the torque fluctuation due to the reluctance torque of the non-excited component can be reduced and the operating 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 are connected in series at both ends of the outer periphery of the outer rotor. Since the field winding is provided to supply the field current to the pair of field windings to excite the magnetic body, a pair of magnetic poles can be formed on each outer rotor in the rotation axis direction. Since this magnetic body has a claw shape, magnetic poles can be formed on each outer rotor. As a result, the torque fluctuation due to the reluctance torque of the non-excited component can be reduced and the operating range can be widened.

According to the present invention of claim 6,
By having a DC power source for supplying DC power to the field winding, can be excited only field winding during operation of the rotary electric machine, it is possible to prevent deterioration of the permanent magnets used in the rotor.

[0017]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. (First Embodiment) FIG. 1 is a sectional view showing a structure of a composite rotary electric machine 1 according to a first embodiment of the present invention. At the drawing, the composite rotary electric machine 1, a plurality of single coils (hereinafter, referred to as coil) and the stator 3 formed of an outer rotor 5 at a predetermined gap in the inner circumference and the outer circumference of the cylindrical stator 3 The inner rotor 7 is arranged to have a triple structure, and the outer rotor 5 and the inner rotor 7 are rotatably provided with respect to the outer frame to be covered.

The inner rotor 7, a pair of salient poles are formed consisting of the inner field windings Li1, Li2 each half,
On the other hand, the outer rotor 5 is provided with two pairs of convex poles composed of the outer field windings Lo1 to Lo4 so as to have twice the number of poles per pole of the inner rotor 7. The stator 3 is composed of three coils 9 for each magnetic pole of the outer rotor 5, and a total of 12 (= 3 × 4) coils 9 are evenly arranged on the same circumference. Reference numeral 11 denotes a core around which a coil is wound, and the same number of cores 11 as the coils 9 are arranged on the circumference at equal intervals with a predetermined gap (gap) 13.

Next, FIG. 2 is a view showing the structure of the inner rotary shaft 15 of the combined rotary electric machine 1. In the figure, the inner rotating shaft 15 has inner field windings Li1, L connected in series.
Slip rings SL1 and SL2 for supplying power from a buck-boost chopper described later are connected to i2.

Next, FIG. 3 is a diagram showing the structure of the outer rotary shaft 17 of the combined rotary electric machine 1. In the figure, the outer rotary shaft 17 has outer field windings Lo1 to L1 connected in series.
Slip rings SL3 and SL4 for supplying power from a buck-boost chopper described later are connected to o4.

Next, FIG. 4 is a side sectional view of the combined rotary electric machine 1 and a block diagram showing a control device 24 for controlling the combined rotary electric machine 1. In the combined rotary electric machine 1, since the rotors 5 and 7 are synchronously rotated respectively, the rotors 5 and 7 are rotated.
Outer rotor position sensor 21 and inner rotor position sensor 2 for detecting the rotor position represented by each rotation phase θo, θi of
3 is 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. 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 each phase, and supplies the q-axis current iq to the inner rotor control unit 33 and the outer rotor control unit 39.

The multi-phase inverter 27 uses the PWM signal provided from the stator control unit 25 to drive the battery 2
The DC current supplied from 9 is converted into an AC current, and the composite currents I1 to I12 are supplied to the coil 9 provided in the stator 3. Since the sum of all the instantaneous currents of the composite currents I1 to I12 becomes 0, this inverter 27 is equivalent to a normal three-phase bridge type inverter configured in 12 phases, and has the same number as 24 transistors. It is composed of a diode. A current sensor is provided at each output terminal of the bridge type inverters of each phase, and outputs the output currents i1 to i12 to the stator control unit 25.

The current sensor 31 includes the buck-boost chopper 35, the brushes Br1 and Br2, the slip rings SL1 and SL.
Inner field winding Li provided on the inner rotor 7 via
1, the current ifi supplied to Li2 is detected. The inner rotor control unit 33 uses the current ifi detected by the current sensor 31.
And the command field current ifi is calculated based on the q-axis current iq calculated by the stator control unit 25, and the command field current ifi is further converted into ON / OFF duty Ton, Toff to obtain the buck-boost chopper. To 35.

The step-up / step-down chopper 35 has ON / OFF duty Ton, Tof provided by the inner rotor control unit 33.
A plurality of transistors provided inside is controlled according to f, and a boosting operation or a dropping operation is performed with respect to the voltage supplied from the battery 29 to output the output current to the slip ring SL.
It is supplied to inner field windings Li1 and Li2 provided in the inner rotor 7 via 1 and SL2. The current sensor 3
7, the outer rotor control unit 39, and the buck-boost chopper 41 are configured by the above-described current sensor 31, outer rotor control unit 33,
Since the configuration of the step-up / step-down chopper 35 is the same,
The description will be omitted.

Next, the operation of the combined rotary electric machine 1 and the controller 24 will be described with reference to FIG.

First, at startup, the inner rotor control unit 33
Sets a predetermined initial value for the command field current ifi, and further turns on / off this command field current ifi.
Converting to duty Ton, Toff, buck-boost chopper 35
Output to.

The step-up / down chopper 35 has an ON / OFF duty T supplied from the inner rotor control unit 33.
A plurality of transistors provided inside are controlled according to on and Toff to perform a step-up operation or a step-down operation with respect to the voltage supplied from the battery 29 to output the output current to the brush Br
1, Br2, and slip rings SL1, SL2 to supply to the inner field windings Li1, Li2 provided in the inner rotor 7. As a result, 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, the S pole and the N pole.

Similarly, at startup, the outer rotor control section 3
9 sets a predetermined initial value for the command field current ifo, and further turns on / off this command field current ifo.
Buck-boost chopper 4 converted to F duty Ton, Toff
Output to 1.

The step-up / step-down chopper 41 has an ON / OFF duty T supplied from the outer rotor control section 39.
A plurality of transistors provided inside are controlled according to on and Toff to perform a step-up operation or a step-down operation with respect to the voltage supplied from the battery 29 to output the output current to the brush Br.
3, Br4, and slip rings SL3, SL4 to supply to the outer field windings Lo1 to Lo4 provided on the outer rotor 5. 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 into, for example, S pole, N pole, S pole, and N pole.

At the same time, the stator control section 25 controls 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. PW as the composite current command value so that a rotating magnetic field is generated between the outer rotor 5 and the inner rotor 7 and the stator 3, respectively.
Generate the M signal.

Then, the multi-phase inverter 27 converts the direct current supplied from the battery 29 into an alternating current based on the PWM signal given from the stator control unit 25, and the composite current is supplied to the coil 9 provided in the stator 3. I 1-
Supply I12. As a result, a rotating magnetic field is generated between the outer rotor 5 and the inner rotor 7 and the stator 3 which are respectively excited, and the outer rotor 5 and the inner rotor 7 are respectively generated.
Each starts to rotate.

Since 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 as the stator control section. 25 is output. Then, the stator control unit 25 determines the output current i of each phase.
The q-axis current iq is calculated on the basis of 1 to i12 and given to the inner rotor control unit 33 and the outer rotor control unit 39. The q-axis current iq is calculated for the q-axis orthogonal to the magnetic pole direction with respect to the d-axis parallel to the magnetic pole direction.

Then, the inner rotor controller 33 controls the current ifi detected by the current sensor 31 and the stator controller 25.
The actual torque .tau.i of the inner rotor 7 is obtained based on the q-axis current iq calculated in.

[Mathematical formula-see original document] τi ∝ifi × iq Then, a command field current ifi is calculated such that the actual torque τi becomes the inner torque command value Ti given to the inner rotor 7, and this command field current is further calculated. turn on if /
The OFF duty Ton and Toff are converted and output to the step-up / down chopper 35. Then, a current is supplied from the step-up / down chopper 35 to the inner field windings Li1 to Li4 provided on the inner rotor 7, and the magnetic fields by the respective field windings are changed. As a result, the inner rotor 7 outputs the inner torque command. Value Ti
It will rotate according to.

The outer rotor control unit 39 also determines 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.

[0036]

[Formula 2] τ o ∝ ifo × iq Then, the command field current ifo is calculated such that the actual torque τ o becomes the outer torque command value To given to the outer rotor 5, and this command field current is further calculated. Turn on ifo /
The OFF duty Ton and Toff are converted and output to the step-up / down chopper 41. Then, a current is supplied from the step-up / down chopper 41 to the outer field windings Lo1 to Lo4 provided in the outer rotor 5, and the magnetic fields of the respective field windings are changed. As a result, the outer rotor 5 outputs the outer torque command. Value To
It will rotate according to.

As an effect of the first embodiment of the present invention, at least one or more rotors have field windings, and the field windings on the rotors generate a controllable magnetic field. Therefore, it is possible to reduce the torque fluctuation due to the reluctance torque of the non-excitation portion, and it is possible to widen the operation range. Further, the field winding can supply a field current to the rotating field winding by being connected to the slip ring provided on the rotating shaft of the rotor.

(Second Embodiment) FIG. 5 is a sectional view showing the structure of a combined rotary electric machine 51 according to a second embodiment of the present invention. The second embodiment has a basic configuration similar to that of the combined rotary electric machine 1 corresponding to the first embodiment shown in FIG. 1, and the same components are designated by the same reference numerals. However, the description thereof will be omitted.

[0039] In the figure, the outer composite rotary electric machine 51 has a plurality of single coils (hereinafter, referred to as coils) at a stator 3 made of a predetermined gap in the inner circumference and the outer circumference of the cylindrical stator 3 The rotor 55 and the inner rotor 57 are arranged to have a triple structure, and the outer rotor 55 and the inner rotor 57 are arranged.
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 is provided with a salient pole composed of eight pairs of permanent magnets and outer field windings Lo1 to Lo4.

Next, FIG. 6 is a diagram showing the structure of the outer rotary shaft 59 of the composite rotary electric machine 51.

In the figure, slip rings SL1 and SL2 for supplying power from a buck-boost chopper, which will be described later, to the outer field windings Lo1 and Lo3 connected in series are connected to the outer rotating shaft 59. , Slip rings SL3, SL4 for supplying power to the outer field windings Lo2, Lo4 connected in series from a buck-boost chopper described later.
Are connected. Therefore, the outer field windings Lo1, Lo
3 is excited to have the same polarity, and the outer field windings Lo2 and Lo4 are excited to have the same polarity.

Next, FIG. 7 is a side sectional view of the composite rotary electric machine 51 and a controller 61 for controlling the composite rotary electric machine 51.
It is a block diagram showing. SW1 is a switch for switching the combination of the polarities of the voltages applied to the outer field windings.

The connecting portion 63 is provided between the step-up / 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 in accordance with 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 from the connection portion 63
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 the S pole, N pole, S pole, and N pole, respectively. Here, since the permanent magnets on both sides of the outer field windings Lo1 to Lo4 have magnetic pole characteristics of S pole, N pole, S pole, and N pole, respectively, the number of pole pairs of the outer rotor 55 is four pole pairs.

On the other hand, SW1 is grounded and logic (0)
In this case, the polarities of the voltages output from the connecting portion 63 to the brushes Br1 to Br4 are as shown in FIG. As a result, the outer field windings Lo1 to Lo4 have N poles and S poles, respectively.
It is excited by the pole, N pole and S pole. Where the outer field winding L
The permanent magnets on both sides of o1 to Lo4 are S pole and N pole, respectively.
The outer rotor 55 has magnetic poles, S poles, and N poles.
The number of pole pairs of is 12 pole pairs.

The description of the operation of the combined rotary electric machine 51 and the control device 61 is the same as the operation of the combined rotary electric machine 1 and the control device 24 described in the first embodiment, so the description thereof is omitted. And Further, in the second embodiment, a case has been described in which the number of pole pairs of the outer field winding provided on the outer rotor 55 is changed, but the present invention is not limited to such a case, and for example, the inner side may be used. An inner field winding may be provided on the rotor 57 and the number of pole pairs may be similarly changed.

The effect of the second embodiment of the present invention is that the field winding provided on the rotor is connected to the slip ring provided on the rotary 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, even when the two rotors are operated with exactly the same rotation characteristics, they can be operated with extremely low loss.
Further, it is possible to reduce the torque fluctuation due to the reluctance torque of the non-excited portion, to expand the operation range, and to prevent the deterioration of the permanent magnet provided in the rotor.

(Third Embodiment) FIG. 9 is a sectional view showing the structure of a composite rotating electric machine 71 according to a third embodiment of the present invention. The third embodiment has the same basic configuration as the combined rotary electric machine 1 corresponding to the first embodiment shown in FIG. 1, and the same components are designated by the same reference numerals. However, the description thereof will be omitted.

[0050] In the figure, the outer composite rotary electric machine 71 has a plurality of single coils (hereinafter, referred to as coils) at a stator 3 made of a predetermined gap in the inner circumference and the outer circumference of the cylindrical stator 3 The 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 combined rotary electric machine 71 in the direction of the rotation axis. The six pairs of magnetic bodies A and A ′ arranged on the outer rotors 75 and 77 are provided with comb-shaped convex portions and concave portions alternately, respectively.
The respective convex portions and concave portions are alternately arranged with a gap having a magnetically uninfluenced degree to form a claw shape. Further, a narrow gap is formed between the stator 3 and the outer rotors 75 and 77 so as to be magnetically affected.

Next, FIG. 11 is a side sectional view of the composite rotary electric machine 71 and a control device 8 for controlling the composite rotary electric machine 71.
3 is a block diagram showing FIG. The stator 3 is fixed to a case (not shown), and the coils 9 provided inside the stator 3 are connected to the output terminals of the multiphase 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 rotation shafts of the outer rotors 75 and 77 are rotatably supported by the stator 3 via bearings 79b and 81b. The outer rotor 7
It is assumed that the rotary shafts of 5, 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 circumference of 5,77,
The excitation windings L11 and L12 are connected to the step-up / down chopper 41. The excitation winding control unit 85 calculates the 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 control unit 25,
Further, the command field current ifo is converted into ON / OFF duty Ton, Toff and output to the buck-boost chopper 41.

Next, with reference to FIG. 10, the flow direction of the magnetic flux in the outer rotors 75, 77 provided on the composite rotating electric machine 71 will be described. As shown in FIG. 10, the excitation winding L1
When an exciting current is applied to 1 and L12 from the buck-boost chopper 41, each is excited and magnetic flux in the direction of the arrow is generated.
The magnetic flux generated in the field winding L11 is generated by the outer rotor 75,
A gap between the outer rotor 75 and the stator 3, a stator 3, a gap between the stator 3 and the outer rotor 77,
It is transmitted to the excitation 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 6 pole pairs.

Next, referring to FIG. 11, the composite rotating electric machine 7
1 and the operation of the control device 83 will be described. First, at startup, the excitation winding control unit 85 sets a predetermined initial value for the command field current ifo, and further converts this command field current ifo into ON / OFF duty Ton, Toff. Output to the step-up / down chopper 41.

The step-up / step-down chopper 41 has an ON / OFF duty To supplied from the excitation winding control unit 85.
A plurality of transistors provided inside are controlled according to n and Toff to perform a step-up operation or a step-down operation with respect to the voltage supplied from the battery 29 to output the output current to the outer rotor
It supplies to the excitation winding L11, L12 provided in 5,77. As a result, a current is supplied to the excitation windings L11 and L12 provided on the outer rotors 75 and 77, the respective excitation windings are excited, and the outer rotors 75 and 77 made of a magnetic material.
Are excited to the N pole and the S pole, respectively.

At the same time, the stator control section 25 controls the outer rotors 75, 77 and the inner rotor 73 with the outer torque command value To and the inner torque command value Ti, and the rotors of the outer rotors 75, 77 and the inner rotor 73. Position θo,
Based on θi, a PWM signal is generated as a composite current command value so that a rotating magnetic field is generated between each of outer rotor 75 and inner rotor 73 and stator 3.

Then, the multi-phase inverter 27 converts the direct current supplied from the battery 29 into an alternating current based on the PWM signal given from the stator control unit 25, and outputs the composite current to the coil 9 provided in the stator 3. I 1-
Supply I12. As a result, rotating magnetic fields are generated between the outer rotors 75 and 77 and the inner rotor 73 and the stator 3 which are respectively excited, and the outer rotors 75 and 7 are excited.
7 and the inner rotor 73 start to rotate.

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

Then, the stator control unit 25 calculates the q-axis current iq based on the output currents i1 to i12 of each phase, and supplies it to the excitation winding control unit 85.

Then, the excitation 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]

[Mathematical formula-see original document] τ o ∝ ifo × iq Then, a command field current ifo is calculated such that the actual torque τ o becomes the outer torque command value To given to the outer rotors 75 and 77, and this command field is further calculated. Magnetic current ifo
Is converted into ON / OFF duty Ton, Toff and output to the buck-boost chopper 41. And the buck-boost chopper 4
1 to the excitation winding L1 provided on the outer rotors 75 and 77
Currents are supplied to 1 and L12, the magnetic fields generated by the respective excitation windings are changed, and as a result, the outer rotors 75 and 77 rotate according to the outer torque command value To.

As an effect of the third embodiment 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 field magnets is provided at both ends of the outer circumference 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 there is one
A pair of magnetic poles can be formed, and further, since the magnetic body has a claw shape, the magnetic pole can be formed on the outer rotor. As a result, it is possible to widen the operating range can reduce torque fluctuations due to reluctance torque of the non-excitation minute.

Further, since the step-up / step-down chopper for supplying DC power to the field winding is provided, the field winding can be excited only when the rotating electric machine is in operation, and deterioration of the permanent magnet used for the rotor is prevented. be able to.

(Fourth Embodiment) FIG. 12 is a sectional view showing the structure of a composite rotating electric machine 91 according to a fourth embodiment of the present invention. It should be noted that the fourth embodiment has the same basic configuration as the compound rotating electrical machine 71 corresponding to the third embodiment shown in FIG. 9, and the same components are designated by the same reference numerals. However, the description thereof will be omitted.

[0067] In the figure, the composite rotary electric machine 91 has a plurality of single coils (hereinafter, referred to as coil) and the stator 3 made of a first rotor 93A with a predetermined gap on the outer periphery of the cylindrical stator 3 , 93A ′ are arranged to provide a double structure. Six pairs of magnetic bodies A and A'are arranged in the first rotors 93A and 93A '.

Next, FIG. 13 is a side sectional view of the combined rotary electric machine 91 and a block diagram showing a control device 107 for controlling the combined rotary electric machine 91. At the drawing, the composite rotary electric machine 91, the first rotary electric machine 91a and the second rotary electric machine 91
It is a complex with b, and both are supposed to rotate independently.

The stator 3 is fixed to a case (not shown), and the coils 9 provided inside the stator 3 are connected to the output terminals of the multiphase 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 provided with a bearing (not shown) through a case (not shown).
It shall be rotatably supported by.

The basic structure of the second rotating electric machine 91b is the first
Since it has the same structure as the rotating electric machine 91a,
Only the differences between the two will be explained. First rotating electric machine 9
The first rotor 93A ′ of 1a and the second rotor of the second rotating electric machine 91b
Between the rotor 101B ′, a concave magnetic coupling part 99a made of a magnetic material and rotating integrally with the first rotor 93A ′, and a magnetic rotor made of a magnetic material and rotating integrally with the second rotor 101B ′. 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 portions 99a, 9
The rotating shaft 9b is rotatably supported by a case (not shown) via a bearing (not shown).

The excitation windings L11 and L12 are respectively the first
Exciting windings L11 and L12 are a pair of coils arranged around the outer circumference of the rotor 93A and the second rotor 101B, and are connected to the step-up / down chopper 41. Excitation winding control unit 1
13 is the current ifo detected by the current sensor 37 and the q-axis current iq calculated by the stator control units 109 and 111.
A command field current ifo is calculated based on 1, iq2, and this command field current ifo is further converted into ON / OFF duty Ton, Toff and output to the buck-boost chopper 41.

The stator control unit 109 includes the first rotary 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 each of A, 93A ′ and the stator 3. Further, the stator control unit 109 controls the output current i of each phase.
The q-axis current iq1 is calculated based on 1 to i12 and given to the excitation winding control unit 113. The configuration of the stator control unit 111 is the same as that of the stator control unit 109, and therefore its description is omitted.

Next, the flow direction of the magnetic flux of the combined rotary 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 buck-boost chopper 41, the exciting windings L11 and L12 are excited to generate magnetic flux. The magnetic flux generated in the field winding L11 is generated by the first rotor 93A (N pole) and the first rotor 93A.
A gap between A and the stator 3, a stator 3, a gap between the stator 3 and the first rotor 93A ', a first rotor 93A' (S pole), a magnetic coupling portion 99a of the first rotor 93A ', a second The magnetic coupling portion 99b of the rotor 101B ', the second rotor 101B' (N pole), the gap between the second rotor 101B 'and the stator 3, the stator 3, the stator 3
And is transmitted to the excitation 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
Is excited to the N pole, and the first rotor 93A 'and the second rotor 1
01B is excited by the S pole, and in the entire rotary electric machine, the S pole and the N pole are alternately excited by 6 pole pairs.

Next, with reference to FIG. 13, the operation of the combined rotary electric machine 91 and the control device 107 will be described. First, at startup, the excitation winding control unit 113 sets a predetermined initial value for the command field current ifo, and further converts this command field current ifo into ON / OFF duty Ton, Toff. Output to the step-up / down chopper 41.

The step-up / step-down chopper 41 has an ON / OFF duty T supplied from the excitation winding controller 113.
A plurality of transistors provided inside are controlled according to on and Toff to perform a step-up operation or a step-down operation with respect to the voltage supplied from the battery 29 to output the output current to the first rotor 9
3A, excitation winding L1 provided on the second rotor 101B
Supply to 1, L12.

As a result, a 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. ', The second rotor 101
B ′ and 101B are excited to the N pole and the S pole, respectively.

At the same time, the stator control unit 109 , based on the torque command value T1 given to the rotating electric machine 91a and the rotor position θ1, the first rotors 93A, 93A ′.
A PWM signal is generated as a composite current command value so that a rotating magnetic field is generated between the stator 3 and the stator 3. Then, the multi-phase inverter 27 converts the direct current supplied from the battery 29 into an alternating current based on the PWM signal given from the stator control unit 109, and the composite current I 1 to the coil 9 provided in the stator 3 is changed. Supply I12.

As a result, between the respectively excited first rotors 93A, 93A 'and the stator 3, the second rotor 10
Rotating magnetic fields are generated between 1B and 101B ′ and the stator 3, and the rotating electric machines 91a and 91b start rotating.

Since 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 from these current sensors are output to the stator controller. 109, 11
It is output to 1.

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

Then, the excitation winding control unit 113 detects the current ifo detected by the current sensor 37 and the stator control unit 10
Based on the q-axis currents iq1 and iq2 calculated in 9, 111, the actual torques τ1 and τ2 of the rotating electric machines 91a and 91b are calculated.
Ask for.

[0082]

[Formula 4] τ1 ∝ifo × iq1, τ2 ∝ifo × iq2 Then, the command field current ifo such that the actual torque τ1, τ2 becomes the torque command values T1, T2 given to the rotating electric machines 91a, 91b. Is calculated, and this command field current ifo is converted into ON / OFF duty Ton, Toff and output to the buck-boost chopper 41. Then, a current is supplied from the step-up / down chopper 41 to the excitation windings L11 and L12 provided in the rotary electric machines 91a and 91b, and the magnetic fields due to the respective excitation windings are changed. As a result, the rotary electric machine 9
1a and 91b rotate according to the torque command values T1 and T2.

As an effect of the fourth embodiment of the present invention, the outer rotor is made of a magnetic material having a claw shape with respect to the direction of the rotation axis, and the outer rotors are connected in series at both ends of the outer periphery of the outer rotor. By having a pair of field 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 on each outer rotor in the rotation axis direction. Since the magnetic body has a claw shape, magnetic poles can be formed on each outer rotor. As a result, the torque fluctuation due to the reluctance torque of the non-excited component can be reduced and the operating range can be widened.

Further, by having the step-up / down chopper for supplying DC power to the field winding, the field winding can be excited only when the rotating electric machine is in operation, and the permanent magnet used for the rotor is prevented from deterioration. be able to.

[Brief description of drawings]

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

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

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

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

FIG. 5 is a cross-sectional view showing a configuration of a combined rotary electric machine 51 according to a second embodiment of the present invention.

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

7 is a side cross-sectional view of the combined rotary electric machine 51 and a block diagram showing a control device 61 for controlling the combined rotary electric machine 51. FIG.

8 is a diagram showing 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. FIG.

FIG. 9 is a cross-sectional view showing a configuration of a composite rotary electric machine 71 according to a third embodiment of the present invention.

FIG. 10 is a cross-sectional view of a combined rotary electric machine 71 in a rotation axis direction.

11 is a side cross-sectional view of the combined rotary electric machine 71 and a block diagram showing a control device 83 for controlling the combined rotary electric machine 71. FIG.

FIG. 12 is a cross-sectional view showing a configuration of a combined rotary electric machine 91 according to a fourth embodiment of the present invention.

13 is a side cross-sectional view of the combined rotary electric machine 91 and a block diagram showing a control device 107 for controlling the combined rotary electric machine 91. FIG.

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

[Explanation of symbols]

1, 51, 71, 91 compound rotating electric machine 3 stator 5, 55, 75, 77 outer rotor 7, 57, 73 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 part 27 Multi-phase inverter 29 Battery 31 Current sensor 33 Inner rotor control part 35 Buck-boost chopper 39 Outer rotor control part 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)

(57) [Claims] 1. A triple structure comprising two rotors provided on an inner circumference and an outer circumference of a stator and connected to different rotating shafts, wherein the stator is separately provided for the two rotors.
A common coil form for the generating a rotating magnetic field, said co
In the compound rotating electric machine, in which a combined current obtained by adding currents corresponding to the respective rotors is caused to flow in the common coil so that the same number of rotating magnetic fields as the number of the rotors are generated , At least one of the rotors should be at least
Also, one or more pairs of field windings are evenly arranged, and
To reduce torque fluctuation due to reluctance torque
In addition, a composite rotating electric machine is characterized in that the value of current flowing through the field winding is controlled . 2. The composite rotating electric machine according to claim 1, wherein the field winding is connected to a slip ring provided on a rotation shaft of the rotor. 3. The composite rotating electric machine according to claim 1, wherein the field winding is capable of changing 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, wherein the stator has the two rotors.
Form a common coil for generating different rotating magnetic field for the common coil, so as many rotating magnetic field of the inner rotor and the outer rotor occurs, pairs each rotor
In the combined rotating electric machine configured to allow a combined current to flow, the outer rotor is made of a magnetic material having a claw shape with respect to the rotation axis direction, and a pair of fields is provided at both ends of the outer rotor. Provide a magnetic winding and
In order to reduce torque fluctuation due to lacance torque,
A composite rotating electric machine characterized by controlling a value of a current flowing through the pair of field windings . 5. Two rotating electric machines each having an outer rotor provided on the outer periphery of the stator and having an outer rotor connected to a rotating shaft are rotatably and independently tandem-connected , and two stators are connected to the stator.
A common coil that generates different rotating magnetic fields is formed on the outer rotors, and each outer rotor is formed so that the same number of rotating magnetic fields as the outer rotors are generated in the common coil.
In the combined rotating electrical machine configured to flow a combined current corresponding to the above, the outer rotor is made of a magnetic material having a claw shape with respect to the rotation axis direction, and the outer rotors of the outer rotors are connected in cascade. A pair of field windings is provided at both ends , and the torque change due to reluctance torque
Value of the current flowing through the pair of field windings so as to reduce movement.
A composite rotating electric machine characterized by controlling 6. The composite rotary electric machine according to any one of claims 4 or 5, characterized in that it has a DC power source for supplying DC power to the field winding.