JP2002238296A - Compound current drive rotary electric machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the loss of an inverter in a compound type rotary electric machine for transmitting power by pluralities of electromagnetically coupled rotary mechanisms. SOLUTION: The compound current drive rotary electric machine has first and second rotors 3 and 5, and first and second stators 4 and 6 that face each rotor. In a coil provided in each stator, the current of a phase that correlates with its own rotor flows. Each phase of both stator coils is connected in parallel so that the other party is set to the in-phase and becomes a phase where the current does not flow for connecting to a phase corresponding to a common polyphase inverter 11. A compound current is supplied from the polyphase inverter 11. As a result, torque and power are transferred between a first rotary electric machine comprising the first rotor and stator, and a second one comprising the second rotor and stator. A loss that is generated inside the common polyphase inverter is smaller than the sum of the loss that is generated inside each inverter when each rotary electric machine is driven by an exclusive inverter, thus reducing the loss in the inverter.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a complex current driven rotating electric machine, and more particularly to a technique for reducing a loss of an inverter for supplying drive power.

[0002]

2. Description of the Related Art An apparatus for transmitting power using a plurality of electromagnetically coupled rotation mechanisms is disclosed in, for example, Japanese Patent Application Laid-Open No. 9-4.
There is an apparatus described in JP-A-6965.

[0003]

However, in such a conventional power transmission device, power is supplied to the rotating mechanisms for power generation and driving by dedicated inverters, respectively. All pass through the inverter. Therefore, there is a problem that the loss generated in the inverter is inevitably increased, and the cooling device of the inverter is also enlarged accordingly.

The present invention has been made to solve the problems of the prior art as described above, and an object of the present invention is to provide a composite current driven rotary electric machine capable of reducing inverter loss.

[0005]

In order to achieve the above object, the present invention is configured as described in the appended claims. That is, according to claim 1, the input shaft mechanically coupled to the prime mover, the first rotor mechanically coupled to the input shaft, and the first rotor electromagnetically coupled to the first rotor. A first stator mechanically coupled to an output shaft, a second rotor mechanically coupled to the output shaft, and electromagnetically coupled to the second rotor. And a second stator that is coupled and fixed to the outside.
By supplying a composite current from a common polyphase inverter to the coil of the first stator and the coil of the second stator, the first rotating electric machine including the first rotor and the first stator, and the second rotor It is configured to transmit and receive torque and electric power to and from a second rotating electric machine including the second stator. As described above, in claim 1, the power generation current and the drive current are supplied as a composite current from the common inverter, so that the loss occurring inside the inverter is reduced when each rotating electric machine is driven by the dedicated inverter. Since the sum is smaller than the sum of the losses generated inside the inverter, the loss in the inverter can be reduced.

[0006] Claim 2 is based on claim 1.
This defines the connection between the coils of the stator and the coils of the second stator. By connecting the coils of the first stator and the coils of the second stator in parallel to supply a composite current by connecting the coils as described in claim 2, the current required for each coil is separated. Can be supplied.

According to a third aspect of the present invention, the multi-phase inverter supplies the sum of the current to be supplied to the coil of the first stator and the current to be supplied to the coil of the second stator. .

In the present invention, the distribution of the current supplied to the coil of the second stator is determined for each pole pair of the second stator according to the value of the current supplied to the coil of the first stator. Make up.

According to a fifth aspect of the present invention, when an arbitrary phase current supplied to the coil of the first stator approaches an allowable current value of the power device forming the multi-phase inverter, the phase is changed to a phase other than the permissible current value. The current is selectively supplied to the second stator.

[0010]

According to the first aspect of the present invention, the loss that occurs in a common inverter that supplies a composite current to two rotating electric machines is the loss that occurs in each inverter when each rotating electric machine is driven by a dedicated inverter. , The loss in the inverter can be reduced, and the transmission efficiency can be further improved. Further, since the loss in the inverter can be reduced, the heat generated in the power device can also be reduced, so that the cooling device can be downsized. Further, by using a multi-phase inverter, it is possible to obtain an effect that even if one of the arms is broken, the arm can be rotated in the remaining phase.

[0011] Further, by connecting as described in claim 2, the composite current is simply supplied from the inverter.
Since the current to the first stator coil and the second stator coil can be naturally distributed, the ineffective current when two coils of the same polarity in the two stator coils are connected in parallel is suppressed, and the overall efficiency is improved. Can be done. According to the third aspect, by setting the sum of the effective currents of the coil of the first stator and the coil of the second stator, a predetermined torque can be obtained without flowing unnecessary current. According to the fourth and fifth aspects, the current flowing through the power device of the inverter can be made uniform.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a block diagram (partly a schematic cross-sectional view) showing the entire configuration of an embodiment of the present invention. 1 includes an input shaft 2 for transmitting an output torque of a prime mover 1 (for example, an internal combustion engine);
A first rotor 3 mechanically coupled to the input shaft 2, an electromagnetically coupled first rotor 3, rotatable relative to the first rotor 3, and a mechanically coupled output shaft 8. The first stator 4 is mechanically coupled to the output shaft 8, the second rotor 5 is mechanically coupled to the output shaft 8, and the second rotor 5 is electromagnetically coupled to the second rotor 5 and is fixed to the outside (for example, an outer frame). Stator 6
And a slip ring 7 for supplying electric power to the coil of the first stator 4 and an output shaft 8 for transmitting the output torque of the first stator 4 and the second rotor 5 to the outside. The first rotor 3 and the first stator 4 constitute a first rotating electric machine, and the second rotor 5 and the second stator 6 constitute a second rotating electric machine. The coils of the first stator 4 and the second stator 6 have their respective phases connected in parallel,
It is connected to a common polyphase inverter 11. The method of connecting the coils of the first stator 4 and the second stator 6 will be described later in detail. In addition, the rotation of the first encoder 9 and the second rotor 5 (therefore, the first stator 4 and the output shaft 8) for detecting the rotation angle and the rotation speed (rotation speed) of the first rotor 3 (therefore, the prime mover 1 and the input shaft 2). A second encoder 10 for detecting an angle and a rotation speed (rotation speed) is provided.

The multi-phase inverter 11 has a DC power supply 14
It comprises a C-link capacitor 15 and a power device. The power device is a circuit in which two parallel circuits of a transistor and a diode are connected in series for the number of phases, and two transistors of each phase are supplied with opposite-phase gate signals. Therefore, when one transistor is on, the other is off, and a current flows in a phase in which the + transistor of the DC power supply 14 is on. The output current of the multi-phase inverter 11 is detected by the current sensor 12. In the case of three-phase AC, a total of four current sensors are provided for each of the first rotating electric machine and the second rotating electric machine for two phases. Further, the voltage of the DC power supply 14 is detected by the voltage sensor 13.

The signals of the first encoder 9, the second encoder 10, the current sensor 12 and the voltage sensor 13 are
It is sent to the multiphase inverter composite current controller 16.
The host controller 17 is, for example, a basic controller for vehicle control, and requires a target output torque signal (and a target motor rotation speed) based on an operation amount of an accelerator pedal, a vehicle speed, and the like.
Is generated and sent to the multiphase inverter composite current controller 16. The multiphase inverter composite current controller 16 calculates a gate signal for controlling the composite current drive rotating electric machine based on the various input signals as described above, and sends the gate signal to the polyphase inverter 11.

Next, the operation of the apparatus shown in FIG. 1 will be described. By the input torque from the prime mover 1, the first rotor 3 mechanically connected thereto rotates. At this time, a three-phase current having a frequency corresponding to the difference between the rotation speed of the first rotor 3 (that is, the rotation speed of the input shaft 2) and the rotation speed of the output shaft 8 is supplied through the slip ring 7 to the first stator 4. Accordingly, a torque having the same magnitude in the opposite direction to the torque of the first rotor 3 can be generated on the output shaft 8. At this time, the first rotor 3 can generate electric power and electric power through the stator 4 according to the torque generated by the prime mover 1, the rotation speed of the first rotor 3, and the rotation speed of the output shaft 8. Thus, the rotation speed of the first rotor 3 (the rotation speed of the input shaft 2)> the output shaft 8
If the number of rotations is, a part of the energy generated by the prime mover 1 can be regenerated by supplying a current having a frequency that is the difference between the two. At this time, torque assist is enabled by applying a three-phase current to the coil of the second stator 6 using the regenerative energy. The second rotor 5 is in a powering state (a state of driving the outside), which means that the multi-phase inverter 11 emits energy. Since the loss that occurs inside a common inverter that supplies a composite current to two rotating electric machines is smaller than the sum of the losses that occur inside each inverter when each rotating electric machine is driven by a dedicated inverter, the loss in the inverter is reduced. The transmission efficiency can be further improved.

The details of the multi-phase inverter composite current controller 16 will be described below. FIG. 2 is a block diagram illustrating an example of the multi-phase inverter composite current controller 16. In FIG. 2, among the signals input to the multi-phase inverter composite current controller 16, the first rotor rotation speed (actual value) and the first rotor rotation angle are signals from the first encoder 9. Similarly, the second rotor rotation speed and the second rotor rotation angle are signals from the second encoder 10. Further, the motor target rotation speed and the target output torque are signals from the host controller 17. The phase current is a signal from the current sensor 12, and the voltage of the DC power supply 14 is a signal from the voltage sensor 13.

First, the target torque calculating section 20 calculates the first rotor target torque using the motor target rotation speed and the first rotor rotation speed. Next, the first target current calculator 21
Then, the target d-axis current and the target q-axis current for the first stator are calculated from the first rotor target torque. At this time, the first target current calculation unit 21 outputs the first rotor speed and the second
The difference rotation speed of the rotor rotation speed is used.

Next, the second target current calculation section 22 determines the target torque of the second rotor by calculating the difference between the target output torque and the first rotor target torque.
Target d for the second stator using the rotor speed
An axis current and a target q-axis current are calculated. Further, the current separation calculation unit 23 separates two components of the first stator current and the second stator current from the detected entire phase current.

Next, in the current conversion operation section 24, the first stator phase current detected in the current separation operation section 23 is used to determine the relative position of the rotor using the rotational speed difference between the first rotor and the second rotor. Thus, the d-axis current for the first stator,
Convert to q-axis current. Similarly, the second stator phase current detected by the current separation calculation unit 23 is used to determine the rotor position (angle) using the second rotor speed (angle), thereby obtaining the d-axis current and q for the second stator. Convert to shaft current.

Next, the first target voltage calculation section 25
The target d-axis current and the target q-axis current for the first stator obtained by the target current calculator 21 and the current conversion calculator 24
A target d-axis voltage and a target q-axis voltage for the first stator are calculated from the actual d-axis current and the q-axis current for the first stator obtained in (1). Similarly, the second target voltage calculator 26
Then, the target d-axis current and the target q-axis current for the second stator obtained by the second target current calculation unit 22 and the actual d-axis current and the q-axis current for the second stator obtained by the current conversion calculation unit 24 Then, the target d-axis voltage and the target q-axis voltage for the second stator are calculated.

Next, a composite voltage generator 27 converts a target d-axis voltage and a target q-axis voltage for the first stator into a three-phase voltage into a first converter 29, and a target d-axis voltage for the second stator. It comprises a second converter 30 for converting the target q-axis voltage into a three-phase voltage and an adder 31 for obtaining the sum of the two. The target d for both stators is obtained using the first rotor rotation angle and the second rotor rotation angle. After converting the shaft voltage and the target q-axis voltage into three-phase voltages, a composite voltage target value is generated by calculating the sum of the three voltages.

Next, the normalizing and correcting section 28 normalizes the composite voltage target value using the voltage of the DC power supply 14 and adds a dead time compensation to generate a PWM modulated signal. By modulating the PWM modulated signal with a carrier signal (for example, a triangular wave signal), a PWM gate signal for driving the polyphase inverter 11 is output.

By opening and closing the power device (switching element) of the polyphase inverter 11 using the gate signal generated as described above, each of the first stator 4 and the second stator 6 connected in parallel to each other is opened. A required current can be supplied to each coil (details will be described later).

FIG. 3 is a block diagram showing another embodiment of the present invention. FIG. 3 shows a portion to be added to the circuit shown in FIG. 2, and FIG. 2 shows only the portion of the composite voltage generation unit 27.

In the present invention, a composite current is supplied from the common multi-phase inverter 11 to the coils of the first stator 4 and the second stator 6 connected in parallel.
Therefore, when the current to be supplied to both the first stator 4 and the second stator 6 for a certain phase among the three phases increases, the load on the elements of the power device of the multiphase inverter 11 becomes unbalanced. For example, when the difference between the rotation speed of the first rotor 3 and the rotation speed of the second rotor 5 (hereinafter referred to as the slip rotation speed) is small and the torque generated by the prime mover 1 is large, the low-frequency large current Power is supplied to the coil of one stator 4. When a large current flows through the first stator 4 as described above, the distribution of the current supplied to the coil of the second stator 6 is changed according to the value of the current supplied to the coil of the first stator 4. By determining for each pole pair, it is possible to equalize the current flowing through the power device of the multi-phase inverter 11.

In FIG. 3, the minimum current phase calculator 33 compares the actual U-phase, V-phase, and W-phase currents of the first stator to determine the three-pole pair (for a rotating electric machine having three pole pairs, details are shown). Among them, a pole having a small current value is detected. And the second
The stator passage electrode searching unit 34 searches for a pole having a small current value as a pole through which a large current can flow to the second stator. As described above, a large current is caused to flow only to the second stator of the phase in which the current flowing to the first stator 4 is small.

First, the current separation calculator 35 separates the component of the second stator current from the detected entire phase current. Next, the target current calculator 36 calculates a target d-axis current and a target q-axis current for the second stator using the second stator current value and the second rotor speed.

The current conversion calculating section 37 uses the torque command value for the second rotor and the second rotor speed to calculate 1
A target d-axis current and a target q-axis current per pole pair are calculated.
The target voltage calculator 38 calculates the target d-axis current and target q-axis current for the second stator obtained by the target current calculator 36 and the target d-axis current and target q-axis current obtained by the current conversion calculator 37. A target d-axis voltage and a target q-axis voltage for the second stator are calculated.

The distribution calculator 39 converts the target d-axis voltage and the target q-axis voltage for the second stator into three-phase voltages, and then supplies the values and the large current obtained by the second stator through electrode searching unit 34. The amount of current supplied to the coil of the second stator is distributed according to the obtained pole. For example, as shown in the output of the distribution calculation unit 39 in FIG. 3, the target voltage is set to be small (for example, 0) for two poles having a large current flowing through the first stator, and is set to be small (for example, 0) for the two poles having small current flowing through the first stator. Increase the target voltage. The correction for the pole through which the large current flows may be, for example, a correction for multiplying the calculated current value by an integer.

The target voltage is switched to a three-phase voltage for the second stator sent from the second converter 30 in FIG. 2 via a switch 32 provided in the composite voltage generator 27.
A composite voltage target value is generated by obtaining the sum of the sum and the three-phase voltage for the first stator. The switching unit 32
Is switched by a switching signal according to the magnitude of the first stator current or the like. For example, when the first stator current is equal to or more than a predetermined value, a corrected target voltage is selected.

As described above, by using a target voltage obtained by performing a large current distribution to a phase having a small first stator current instead of the normal target voltage for the second stator, the power device of the multi-phase inverter 11 can be used. The current flowing can be made uniform.

FIG. 4 shows a more specific embodiment of the circuit shown in FIG. 3, in which an arbitrary phase current supplied to the coil of the first stator 4 forms a multi-phase inverter 11. This is an example in which a current to the second stator is selectively passed to a phase other than the allowable current value when the current value approaches the allowable current value. In this case, the current sensor 12 shown in FIG.
Is to detect the current for each of 9 phases (3 phases × 3).

When a low-frequency, large current is applied to the first stator 4, if a current in one phase is small due to three-phase alternating current, a large current flows in the other two phases for a relatively long time. ing. Therefore, by distributing a large current to the first stator 4 for the two phases and supplying a large current to the second stator 6 for the remaining one phase, the current imbalance of the polyphase inverter 11 as a whole is reduced. Can be eliminated.

In FIG. 4, the current judging section 40 finds the difference between the actual current value of the first stator 4 and the allowable current of the power device of the multi-phase inverter 11 for each of the nine phases of the composite current. Is smaller than a predetermined value, that is, when the allowable current of the power device is likely to be saturated only by the current flowing through the first stator 4, the composite voltage generation unit 27
The current supplied to the second stator 6 is stopped for the phase in which the allowable current is likely to be saturated by switching the switching unit 32 provided therein. Then, a large current flows to the second stator 6 only for the phase in which the current of the first stator 4 is small.

The calculation of the current value is the same as that of FIG. 3, and the target d per one pole pair is calculated from the torque command value for the second rotor.
An axis current and a target q-axis current are calculated, and a target voltage is generated from the actual d-axis current and the q-axis current. As a result, power is supplied to the first stator 4 for the six phases of the polyphase inverter 11 (in this case, nine phases), and the second stator is supplied for the three phases (the phase where the current of the first stator 4 is small). Power is supplied to 6.

Next, one phase is energized to the first stator 4, and when the current is large, half of the current is applied to the remaining two phases. Of current. First, d that can be obtained with the one pole pair described above
The shaft current and the q-axis current are calculated, and the target d-axis current and the target q-axis current are calculated as a two-pole pair motor so as not to generate any more torque in the two-pole pair. After that, the actual d-axis current,
A target d-axis voltage and a target q-axis voltage are generated from the q-axis current.
At this time, power is supplied to the first stator 4 for three phases of the nine-phase inverter, and power is supplied to the second stator 6 for six phases.

Next, the first stator 4 and the second stator 4 shown in FIG.
The method of connecting the coils of the stator 6 will be described in detail. As a complex type rotating electric machine, there is one described in Japanese Patent Application Laid-Open No. 11-275826 filed by the present applicant before. The arrangement and the like of the rotor magnetic poles and the stator coils in the rotating electric machine of the present invention are basically the same as in the above-mentioned document.
In addition, Japanese Patent Application No. 11-3516, filed by the present applicant, has previously filed.
No. 13 and Japanese Patent Application No. 2000-358004 (both not disclosed) are composite rotating electric machines having a stator coil and a rotor independently, each having two rotors and a stator facing each rotor. A current having a phase correlated with its own rotor flows through the coil provided on the stator of the inverter, and the other party connects the respective phases of the coils of both stators in parallel so that the phase becomes the phase in which the current does not flow. By connecting to the corresponding phase and supplying a composite current from the inverter to control both rotors independently, it is possible to suppress the invalid current when the coils of the same polarity in the two stator coils are connected in parallel, A rotating electric machine with improved overall efficiency is described.

In the above rotating electric machine, when one of the rotors is operated as a motor and the other is operated as a generator, it is only necessary to supply a current corresponding to the difference between the motor driving power and the generated power to a common coil. Can be greatly improved. When only one inverter is required for two stator coils, and one of the rotors is operated as a motor and the other is operated as a generator, as described above, the difference between the motor driving power and the generated power is calculated as described above. Only needs to flow the current through the common coil,
The capacitance of the power switching transistor of the inverter can be reduced, thereby improving the switching efficiency and further improving the overall efficiency. However, when the stator coils of the two rotating electric machines are simply connected in parallel to the output of the inverter, a current for driving one rotor also flows to the other stator coil. Since this current has no correlation with the rotation of the rotor, it does not contribute to the generation of the driving force of the rotating electric machine. When such an invalid current flows, a loss such as copper loss occurs, so that the efficiency of the entire rotating electric machine is reduced and adverse effects such as an increase in heat generation are caused. The above-mentioned prior application solves the above problem by changing the connection of the neutral point, and the connection method between the two stators and the polyphase inverter in the present invention is basically based on the same considerations as above. .

The details will be described below. 5 to 8 are circuit diagrams for explaining a connection method according to the present invention.
FIG. 5 is a circuit diagram showing a controller and a driver, and FIG.
FIG. 7 is a circuit diagram showing a connection between a 12-phase inverter and a stator coil, and FIG. 8 is a circuit diagram showing one phase of a driver. 5 and 6 are a,
a ', b, b',..., l, l 'are connected to each other at the same reference numerals, and the circuits of FIGS. 6 and 7 are connected to each other at the same reference numerals 1 to 12. I have. Note that the controller 50 in FIG. 5 corresponds to a part of the multi-phase inverter composite current controller 16 in FIG. 1, and FIG. 6 corresponds to the poly-phase inverter 11 in FIG.

In FIG. 5, reference numeral 50 denotes a controller;
Is a driver. The controller 50 includes a signal source 52, an adder 53 (a symbol encircled by Σ), and a sample and hold circuit 54. The signal sources 52 are each shown in FIG.
2 corresponds to the output of the first conversion unit 29 and the output of the second conversion unit 30. The adder 53 corresponds to the addition unit 31 in FIG.

As described above, the signal source 52 indicates the voltage command value of each phase, and the voltage command values VU, VV, VW, VA, VB, VU, V, W, A, B, C, and D in each phase. VC, VD
Is as follows. VU = V1 sin (θ1) VV = V1 sin (θ1-120 °) VW = V1sin (θ1-240 °) VA = V2sin (θ2) VB = V2sin (θ2-90 °) VC = V2sin (θ2-180 °) VD = V2 sin (θ2-270 °) where θ is the rotation angle of each rotating electric machine (rotor rotation angle)
Is determined by The unit of V1 and V2 is%, which is a modulation rate in so-called PWM control.

The adder 53 comprises U, V, W and A, B, C, D
Are added and output. The sample hold circuit 54 samples and holds the output of each adder 53 and outputs it. The sample-and-hold circuit 54 is necessary for digital control, but is not necessary for analog control.

Next, the driver 51 compares the output of the sample hold circuit 54 or the adder 53 (in the case of analog control) with the triangular wave signal (carrier signal) from the triangular wave oscillator 55 as shown in FIG. By doing
It is composed of a comparator 61 for outputting a WM signal and an inverter 62 for inverting and outputting the PWM signal. Such circuits are provided for the number of phases (in this case, for 12 phases). The output of the comparator 61 of each phase is the positive-phase signals a, b,
, L, and the output (inverted signal) of the inverter 62 of each phase becomes a ', b', ..., l '.

Next, the multi-phase inverter shown in FIG. 6 includes a DC power supply 56, a capacitor 57, and two switching circuits 58 for each phase. The switching circuit 58 is configured by a parallel circuit of a transistor and a diode. In each phase, two switching circuits are connected in series. One gate terminal is supplied with a positive-phase signal (a, b,..., L) of the driver 51, and the other gate terminal is supplied with an inverted signal (a ', B', ..., l '). Therefore, when one of the two switching circuits is on, the other is off, and a current flows in a phase in which the switching circuit near the + side of the DC power supply 56 is on.
6 indicate output terminals of each phase, respectively.

Next, FIG. 7 is a diagram showing the connection between the inverter and the stator coil in the two rotating electric machines. One of the rotating electric machines is connected to the first rotating electric machine 59 (the first rotor 3 and the first stator 4 in FIG. 1). ), And the other rotating electrical machine is referred to as a second rotating electrical machine 60 (corresponding to a rotating electrical machine including the third rotor 5 and the second stator 6 in FIG. 1). The number of pole pairs means the number of magnetic pole pairs (one pair of N and S) provided on the rotor. The number of electrical poles of the coil is a product of the number of phases of the driving current and the number of pole pairs, and corresponds to the number of stator coils.

In FIG. 7, the first rotating electric machine 59 has the number of stator coil phases s1 = 12 The number of rotor pole pairs P1 = 4 The number of driving AC current phases m1 = 3 (that is, three phases of U, V, W) k1 = 1 p1 = 4 The number of stator coil phases s2 = 12 Number of rotor pole pairs P2 = 3 Number of driving AC current phases m2 = 4 (that is, four phases of A, B, C, and D) k2 = 1 p2 = 3 is there. That is, this case shows a case where a rotating electric machine having four pole pairs and three phases and a rotating electric machine having three pole pairs and four phases are combined.

FIG. 9 is a first circuit diagram showing a connection example of the stator coils of the first rotating electric machine and the second rotating electric machine that are compatible with the above-described composite rotating electric machine. Note that the coil numbers (1.1), (1.2), (1.3) and the like in FIG. 7 and the same reference numerals in FIG. 9 indicate the same coils.

The connection method will be described below with reference to FIG. First, in the stator of the first rotating electric machine 59, 12
A phase number circulating between 1 and 3 is assigned to each of the coils in order from an arbitrary coil (the top coil in FIG. 9).
Also, the 12 coils are divided into four groups including one set of three coils having different phase numbers, and group numbers 1 to 4 are assigned to each group. In FIG. 9, the group number and phase number of each coil are represented by (group number, phase number). In this case, since the group numbers are 1 to 4 and the phase numbers are 1 to 3, each coil is then divided into four groups. First group (1.1) (1.2) (1.3) Second group (2.1) (2.2) (2.3) Third group (3.1) (3.2) ( 3.3) Fourth group (4.1) (4.2) (4.3) The ends of the coils belonging to the same group (the terminals that are not the terminals connected to the inverter) are mutually connected. That is, the stator coil of the first rotating electric machine 59 is Y
Wired.

Next, in the stator of the second rotating electric machine 60, phase numbers circulating between 1 and 4 are sequentially assigned to the twelve coils from an arbitrary coil (the top coil in FIG. 9). Further, the 12 coils are divided into three groups including one set of four coils having different phase numbers, and group numbers 1 to 3 are assigned to each group. In FIG.
The group number and phase number of each coil are represented by (group number, phase number). In this case, the group number is 1
-3 and the phase numbers 1-4, each coil is divided into the following three groups. First group (1.1) (1.2) (1.3) (1.4) Second group (2.1) (2.2) (2.3) (2.4) Third group ( 3.1) (3.2) (3.3) (3.4) Terminal of each coil belonging to the same group (neutral point)
Are connected to each other. That is, the second rotating electric machine 60
Are Y-connected.

Next, the first rotating electric machine 5 is connected to the same terminal of the 12-phase inverter having 12 output terminals shown in FIG.
9 coil (ij) and the coil (j.
i). That is, the terminal 1 of the coil (1.1) of the first rotating electrical machine and the terminal 1 of the coil (1.1) of the second rotating electrical machine are commonly connected to the terminal 1 of the 12-phase inverter. The terminal 2 of 1.2) and the terminal 5 of the coil (2.1) of the second rotating electrical machine are commonly connected to the terminal 2 of the 12-phase inverter. The terminal 3 of the coil (1.3) of the first rotating electrical machine and the terminal 5 The terminal 9 of the coil (3.1) of the two rotating electric machine is commonly connected to the terminal 3 of the 12-phase inverter. The terminal 12 of the coil (4.3) of the first rotating electric machine and the coil (3) of the second rotating electric machine are connected. .4) and the terminal 12 of the 12-phase inverter are connected in common. The above connection is the same as in FIG.

Next, the current control of the composite rotating electric machine connected as described above will be described. First, the first rotating electric machine 59
When only the first rotating electric machine 59 is driven (three-phase driving based on the U-phase, V-phase, and W-phase), the coil of the first rotating electric machine 59 having the phase number 1 is the U-phase, the coil having the phase number 2 is the V-phase, A terminal voltage of each coil is controlled by a 12-phase inverter so that a W-phase current flows through each of the coils whose phase number is 3. As a result, a rotating magnetic field having four pole pairs is generated. At this time, the voltage is also applied to the coil terminal of the second rotating electric machine 60, but the U-phase voltage is applied to all the terminals of the coil of the second rotating electric machine having the group number 1 and the second terminal having the group number 2 V-phase voltage is applied to all the terminals of the coil of the rotating electric machine, and W is applied to all the terminals of the coil of the second rotating electric machine whose group number is 3.
Since a voltage of each phase is applied and the terminals of the coils in each group are connected to each other, no current flows through the coils of the second rotating electric machine 60.

Next, only the second rotating electric machine 60 is driven (A
Phase, B-phase, C-phase, and D-phase)
In the second rotating electrical machine 60, the coil having the phase number 1 is the A phase, the coil having the phase number 2 is the B phase, the coil having the phase number 3 is the C phase, and the coil having the phase number 4 is the D phase. The terminal voltage of each coil is controlled by the 12-phase inverter so that the current flows respectively. Thereby, a rotating magnetic field having three pole pairs is generated. At this time, the voltage is also applied to the coil terminal of the first rotating electrical machine 59, but the voltage of the A-phase is applied to all the terminals of the coil of the first rotating electrical machine 59 having the group number 1 and the second terminal having the group number 2 The B-phase voltage is applied to all the terminals of the coil of the single rotating electric machine 59, the C-phase voltage is applied to all the terminals of the coil of the first rotating electric machine 59 having the group number 3, and the first rotating electric machine 59 is set to the group number 4. Since the D-phase voltage is applied to all the terminals of the coils of each group and the terminals of the coils in each group are connected to each other, the first
No current flows through the coil of the rotating electric machine 59.

Next, the first rotating electric machine 59 and the second rotating electric machine 6
0, the U-phase current flows through the coil (1.1) of the first rotating electric machine 59, and the A-phase current flows through the coil (1.1) of the second rotating electric machine 60. A flowing voltage is output to the terminal 1 of the 12-phase inverter. At this time, a composite current of the U-phase current and the A-phase current flows through the terminal 1 of the 12-phase inverter. Similarly, a composite current of the V-phase current and the A-phase current flows through the terminal 2 of the 12-phase inverter, and a composite current of the W-phase current and the A-phase current flows through the terminal 3 of the 12-phase inverter. Also in this case, the coils of the first rotating electric machine 59 have U-phase, V-phase, and W-phase.
Only the phase current flows, and A
Only the phase, B phase, C phase and D phase flow.

The first rotating electric machine 59 and the second rotating electric machine 6
The current control device that supplies the above-mentioned current to the power supply 0 has the configuration shown in FIGS. 5 and 6 and supplies the following current. That is, when the control current of each rotating electric machine corresponding to the phase number 1 is used as a reference, the phase number j
The control current for the first rotating electrical machine corresponding to
A current whose phase is different by 60 degrees × (j−1) / m1
The control current for the second rotating electrical machine corresponding to the phase number i is a current having a phase different from the reference by 360 degrees × (i−1) / m 2, and the first rotation having the group number i and the phase number j is set. Electric machine stator coil and group number j and phase number i
The control current for the first rotating electrical machine corresponding to the phase number j and the control current for the second rotating electrical machine corresponding to the phase number i are combined at the terminal of the second rotating electrical machine connected to the stator coil of the second rotating electrical machine. The terminal voltage is controlled so that a composite current obtained by the above flows.

As described above, in the composite rotating electric machine of the present embodiment, only the current synchronized with the rotor rotation of each rotating electric machine flows through the stator coils of each rotating electric machine, so that the copper loss generated in each stator coil is It is about the same as copper loss when each rotating electric machine is driven by a dedicated inverter.
Further, a composite current flows inside the inverter, and the loss generated inside the inverter is smaller than the sum of the loss generated inside each inverter when each rotating electric machine is driven by a dedicated inverter. This is because the average current value of the composite current obtained by combining the control currents of the rotating electric machines is smaller than the value obtained by individually calculating the average value of the control current of each rotating electric machine and calculating the sum. by.

Next, FIG. 10 is a second circuit diagram showing the connection of the stator coils. This circuit diagram is the same as that of FIG. 9 except that the connection between the stator coils of the first rotating electric machine 59 and the second rotating electric machine 60 is △ connection in the circuit shown in FIG.

FIG. 11 is a third circuit diagram showing the connection of the stator coils. 11, in the first rotating electric machine 59, the numbers of the coils included in each group are the same as those in FIG. 9, and for example, the first group is (1.1) (1.
2) (1.3). In this case, the coil of terminal 1 is (1.1), the coil of terminal 5 is (1.2), and the coil of terminal 9 is (1.3). . Similarly, the second rotating electric machine 60
Also, in the first group, the coil of the terminal 1 has (1.
1) The coil of the terminal 10 is (1.2), the coil of the terminal 7 is (1.3), and the coil of the terminal 4 is (1.4).

As shown in FIG. 11, the defined "group" does not necessarily need to be constituted by adjacent coils. In short, the coil to which currents of different phases should flow is k1 (k
2) (one in this example) may be included.

In the example of FIG. 11, the coils of the same group are separated from each other by 120 degrees or 90 degrees.
Such an arrangement is not essential. Such an arrangement is 4
In the combination of the three pole pairs and the three pole pairs, it is possible to completely realize that "the current of the self flows and the current of the other does not flow", and that the coil terminals 1 and 1, and 2 2,
This is an example in which 3 and 3,... Can be connected.

Next, FIGS. 12 to 14 are circuit diagrams of another embodiment showing a connection method, FIG. 12 is a circuit diagram showing a controller and a driver, and FIG. 13 is a circuit diagram showing a 9-phase inverter. 14 is a circuit diagram showing the connection between the 9-phase inverter and the stator coil. The circuits in FIGS. 12 and 13 are connected to each other at the same reference numerals as a, a ', b, b',..., I, i ', and the circuits in FIGS.
9 are connected to each other at the same reference numerals. The components of each circuit are the same as those in FIGS.
The part that changed from 2 phase to 9 phase is different.

In FIG. 14, the first rotating electric machine 59 has a stator coil phase number s1 = 9 rotor pole pair number P1 = 3 number of driving AC current phases m1 = 3 (that is, three phases of u, v, w) k1 = 1 p1 = 3 In the second rotating electric machine 60, the number of stator coil phases s2 = 9 The number of rotor pole pairs P2 = 3 The number of driving AC current phases m2 = 3 (that is, three phases of U, V, W) k2 = 1 p2 = 3. That is, this case shows a case where a rotating electric machine having three pole pairs and three phases and a rotating electric machine having three pole pairs and three phases are combined.

FIG. 15 is a first circuit diagram showing a connection example of a first rotating electric machine and a second rotating electric machine which are compatible with the above-described composite rotating electric machine. The coil number (1.1) in FIG.
(1.2) (1.3) etc. and the same reference numerals in FIG. 15 indicate the same coils.

Hereinafter, the connection method will be described with reference to FIG. First, in the first rotating electric machine 59, phase numbers circulating between 1 and 3 are assigned to nine coils in order from an arbitrary coil (the top coil in FIG. 15). Also, 9
The coils are divided into three groups including one set of three coils having different phase numbers, and group numbers from 1 to 3 are assigned to each group. In FIG. 15, the group number and phase number of each coil are represented by (group number, phase number). In this case, the group number is 1-3 and the phase number is 1.
-3, each coil is then divided into three groups. First group (1.1) (1.2) (1.3) Second group (2.1) (2.2) (2.3) Third group (3.1) (3.2) ( 3.3) The ends of the coils belonging to the same group (the terminals that are not the terminals connected to the inverter) are connected to each other. That is, the stator coil of the first rotating electric machine 59 is Y
Wired. However, a △ connection is also possible as in FIG.

Similarly, in the second rotating electric machine 60, the nine coils are divided into first to third groups. Also in this case, the ends of the coils belonging to the same group (the terminals that are not terminals connected to the inverter) are connected to each other,
The stator coils of the rotating electric machine 60 are Y-connected. However, a △ connection is also possible as described above.

Next, the same terminal of the nine-phase inverter having nine output terminals is connected to the coil (i.
j) and the coil (ji) of the second rotating electric machine 60 are connected. That is, the terminal 1 of the coil (1.1) of the first rotating electric machine 59 and the terminal 1 of the coil (1.1) of the second rotating electric machine 60 are commonly connected to the terminal 3 of the 9-phase inverter. The terminal 2 of the coil (1.2) and the terminal 4 of the coil (2.1) of the second rotating electric machine 60 are commonly connected to the terminal 2 of the 9-phase inverter. The coil (1.3) of the first rotating electric machine 59 Terminal 3 of the second rotating electrical machine 60 and the terminal 7 of the coil (3.1) of the second rotating electrical machine 60 are commonly connected to the terminal 1 of the 9-phase inverter. The terminal 9 of the coil (3.3) of the first rotating electrical machine and the second The terminal 9 of the coil (3.3) of the rotating electric machine is commonly connected to the terminal 7 of the 9-phase inverter. The above connection is the same as in FIG.

Next, the current control of the composite rotating electric machine connected as described above will be described. First, the first rotating electric machine 59
When only the first rotating electric machine 59 is driven (three-phase driving by the u-phase, v-phase, and w-phase), the w-phase is applied to the coil having the phase number 1 of the first rotating electric machine 59, the v-phase is applied to the coil having the phase number 2; The terminal voltage of each coil is controlled by a 9-phase inverter so that a u-phase current flows through each of the coils whose phase number is 3. Thereby, a rotating magnetic field having three pole pairs is generated. At this time, a voltage is also applied to the terminals of the coil of the second rotating electric machine 60, but the w-phase voltage is applied to all the terminals of the coil of the second rotating electric machine 60 having the group number 1, and the group number is 2. The v-phase voltage is applied to all the terminals of the coil of the second rotating electric machine 60, the u-phase voltage is applied to all the terminals of the coil of the second rotating electric machine 60 having the group number 3, and each of the terminals in the same group Since the other ends of the coils are connected to each other, no current flows through the coils of the second rotating electric machine 60.

Next, only the second rotating electric machine 60 is driven (U
In the case of three-phase driving with three phases, V phase and W phase), the coil of the second rotating electric machine 60 having the phase number 1 is the U phase, the coil having the phase number 2 is the V phase, and the phase number is 3 The terminal voltage of each coil is controlled by a 9-phase inverter so that a W-phase current flows through a certain coil. Thereby, a rotating magnetic field having three pole pairs is generated. At this time, the voltage is also applied to the terminals of the coil of the first rotating electric machine 59, but the U-phase voltage is applied to all the terminals of the coil of the first rotating electric machine 59 whose group number is 1, and the group number is 2. A V-phase voltage is applied to all the terminals of the coil of the first rotating electric machine 59, and a W-phase voltage is applied to all of the terminals of the coil of the first rotating electric machine 59 having the group number 3, and each of the terminals in the same group. Since the other ends of the coils are connected to each other, no current flows through the coils of the first rotating electric machine 59.

Next, the first rotating electric machine 59 and the second rotating electric machine 6
0 and the U-phase current flows through the coil (1.3) of the first rotating electric machine 59, and the U-phase current flows through the coil (3.1) of the second rotating electric machine 60. A flowing voltage is output to the terminal 1 of the 9-phase inverter. At this time, a composite current in which the u-phase current and the U-phase current are combined flows through the terminal 1 of the 9-phase inverter.
Similarly, a composite current of the v-phase current and the V-phase current flows through the terminal 2 of the 9-phase inverter, and w flows through the terminal 3 of the 9-phase inverter.
A composite current of the phase current and the W-phase current flows. Again,
Only the u-phase, v-phase, and w-phase currents flow through the coil of the first rotating electric machine 59, and the U-phase, V-phase current flows through the coil of the second rotating electric machine 60.
Phase, only the W phase flows.

The first rotating electric machine 59 and the second rotating electric machine 6
The current control device that supplies the above-described current to 0 has the configuration as shown in FIGS. 12 and 13 and supplies the following current. That is, when the control current of each rotating electrical machine corresponding to phase number 1 is set as the reference, the control current for the first rotating electrical machine corresponding to phase number j is 360 degrees × (j−1) with respect to the reference. / M1 and the control current for the second rotary electric machine corresponding to the phase number i is a current having a phase different from the reference by 360 degrees × (i−1) / m2, and the group number is i. The first whose phase number is j
A control current for the first rotating electrical machine corresponding to the phase number j and a phase number i are connected to a terminal to which the stator coil of the rotating electrical machine and the stator coil of the second rotating electrical machine having the group number j and the phase number i are connected. The terminal voltage is controlled so that a composite current obtained by combining the control current for the second rotating electric machine corresponding to the above-described method flows. In this embodiment, the two rotating electric machines constituting the composite rotating electric machine have the same number of rotor pole pairs, but the present invention can be applied to such a structure.

FIG. 16 is another circuit diagram showing the connection of the stator coils. In FIG. 16, the first rotating electric machine 59 has a stator coil phase number s1 = 18 rotor pole pair number P1 = 6 number of driving AC current phases m1 = 3 (that is, three phases of u, v, w) k1 = 2 p1 = 3 In the two-turn electric machine 60, the number of stator coil phases s2 = 9 The number of rotor pole pairs P2 = 3 The number of driving AC current phases m2 = 3 (that is, three phases of U, V, and W) k2 = 1 p2 = 3. That is, this case shows a case where a rotating electrical machine having six pole pairs and three phases and a rotating electrical machine having three pole pairs and three phases are combined.

The connection method will be described below with reference to FIG. First, in the first rotating electric machine 59, 18 coils are used.
The phase number circulating between 1 and 3 is set to an arbitrary coil (FIG. 16).
Then, it is applied in order from the top coil). The 18 coils include two sets of three coils having different phase numbers.
Each group is divided into groups, and a group number from 1 to 3 is assigned to each group. Then, two coils having the same phase number in the same group are connected. The ends of the coils in each group are connected to each other. Therefore, this circuit is Y-connected. However, a △ connection is also possible as described above.

In the second rotating electric machine 60, phase numbers circulating between 1 and 3 are sequentially assigned to the nine coils from an arbitrary coil (the top coil in FIG. 16).
Then, the nine coils are divided into three groups including one set of three coils having different phase numbers.
Group numbers up to are assigned. The ends of the coils in each group are connected to each other. Therefore, this circuit is Y-connected. However, a △ connection is also possible as described above.

Next, the coil (i.j) of the first rotating electric machine is connected to the same terminal of the nine-phase inverter having nine output terminals.
And the coil (j.1) of the second rotating electric machine. That is, the terminal 1 of the two coils (1.1) of the first rotating electric machine 59 and the terminal 1 of the coil (1.1) of the second rotating electric machine 60 are commonly connected to the terminal 3 of the 9-phase inverter. The terminal 2 of the two coils (1.2) of the electric machine 59 and the terminal 4 of the coil (2.1) of the second electric rotating machine 60 are commonly connected to the terminal 2 of the 9-phase inverter. The terminal 3 of the coil (1, 3) and the terminal 7 of the coil (3.1) of the second rotating electric machine 60 are commonly connected to the terminal 1 of the 9-phase inverter. .3) and the terminal 9 of the coil (3.3) of the second rotating electrical machine 60 are commonly connected to the terminal 7 of the 9-phase inverter.

The current control in the circuit of FIG.
This is the same as the description of FIG. However, the first rotating electric machine 59
Generates a rotating magnetic field having six pole pairs.

The connection methods described so far are summarized as follows. That is, the rotor includes a rotor having the number of pole pairs P1, and s1 stator coils that are concentratedly wound,
A second rotating electric machine driven by an alternating current having a phase number of m1, a rotor having P2 pole pairs, and s2 stator coils wound in a concentrated manner; a second rotating electric machine driven by an alternating current having a phase number of m2; S1 = P1 × m1, s2 = P2 × m2, P1 = k1 × m2, P2 = k2 × m1 between the first rotating electrical machine and the second rotating electrical machine. However, k1,
k2 is a natural number. When p1 = P1 / k1 and p2 = P2 / k2, a relationship of p1 × m1 = p2 × m2 is established, and circulates between 1 and m1 in s1 stator coils of the first rotating electric machine. Are assigned in order from an arbitrary stator coil, and s1 stator coils are grouped into p1 groups including k1 sets of m1 stator coils having different phase numbers, and each group is assigned 1 to p1. To the s2 stator coils of the second rotating electric machine, phase numbers circulating between 1 and m2 are sequentially assigned from an arbitrary stator coil, and the s2 stator coils are assigned a phase number. When m2 stator coils having different numbers are grouped into p2 groups including k2 sets and each group is assigned a group number from 1 to p2, the group belongs to each group. The stator coils are connected to each other by Y connection or Δ connection, and
One end of the stator coil of the first rotating electrical machine having the group number i and the phase number j is connected to one end of the stator coil of the second rotating electrical machine having the group number j and the phase number i.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an overall configuration of an embodiment of the present invention.

FIG. 2 is a block diagram showing an example of a multi-phase inverter composite current controller 16 in FIG.

FIG. 3 is a block diagram showing another embodiment of the present invention.

FIG. 4 is a block diagram showing a more specific embodiment of FIG. 3;

FIG. 5 is a circuit diagram showing an example of a controller and a driver in the rotating electric machine to which the present invention is applied.

FIG. 6 is a circuit diagram showing an example of a 12-phase inverter in a rotating electric machine to which the present invention is applied.

FIG. 7 is a circuit diagram showing connection between an inverter and a stator coil in a rotating electric machine to which the present invention is applied.

FIG. 8 is a circuit diagram showing one phase of a driver.

FIG. 9 is a first circuit diagram showing a method of connecting stator coils in a rotating electric machine to which the present invention is applied.

FIG. 10 is a second circuit diagram showing a method of connecting stator coils in a rotating electric machine to which the present invention is applied.

FIG. 11 is a third circuit diagram showing a method of connecting stator coils in a rotating electric machine to which the present invention is applied.

FIG. 12 is a circuit diagram showing another example of a controller and a driver in the rotating electric machine to which the present invention is applied.

FIG. 13 is a circuit diagram showing another example of a 9-phase inverter in a rotating electric machine to which the present invention is applied.

FIG. 14 is a circuit diagram showing another example of a method of connecting an inverter and a stator coil in a rotating electric machine to which the present invention is applied.

FIG. 15 is a first circuit diagram in another example showing a method of connecting stator coils in a rotating electric machine to which the present invention is applied.

FIG. 16 is a second circuit diagram in another example showing a method of connecting stator coils in a rotating electric machine to which the present invention is applied.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Prime motor 2 ... Input shaft 3 ... 1st rotor 4 ... 1st stator 5 ... 2nd rotor 6 ... 2nd stator 7 ... Slip ring 8 ... Output shaft 9 ... 1st encoder 10 ... 2nd encoder 11 ... Polyphase inverter DESCRIPTION OF SYMBOLS 12 ... Current sensor 13 ... Voltage sensor 14 ... DC power supply 15 ... DC link capacitor 16 ... Multi-phase inverter combined current controller 17 ... Host controller 20 ... Target torque calculator 21 ... First target current calculator 22 ... Second target current calculation Unit 23 current separation operation unit 24 current conversion operation unit 25 first target voltage operation unit 26 second target voltage operation unit 27 composite voltage generation unit 28 normalization and correction unit 29 first conversion unit 30 Second conversion section 31 Addition section 32 Switching section 33 Minimum current phase calculation section 34 Second stator through electrode search section 35 Current separation calculation section 36 Target current Calculation unit 37 Current conversion calculation unit 38 Target voltage calculation unit 39 Distribution calculation unit 40 Current determination unit 50 Controller 51 Driver 52 Signal source 53 Adder 54 Sample hold circuit 55 Triangular wave oscillator 56 DC Power supply 57 ... Capacitor 58 ... Switching circuit 59 ... First rotating electric machine 60 ... Second rotating electric machine 61 ... Comparator 62 ... Inverter S1, S2 ... Torque command signal S3, S4 ...
Phase signal L: stator coil Z: impedance a, b, c, d: neutral point A, B, C,
D, E, F ... neutral point

Claims (5)

[Claims] An input shaft mechanically coupled to a prime mover; a first rotor mechanically coupled to the input shaft; an electromagnetically coupled to the first rotor; A first stator that is relatively rotatable and mechanically coupled to an output shaft, a second rotor mechanically coupled to the output shaft, and electromagnetically coupled to the second rotor; And a second stator fixed externally, wherein a composite current is supplied from a polyphase inverter common to the coil of the first stator and the coil of the second stator. A composite current drive for transmitting and receiving torque and electric power between a first rotating electric machine including a first rotor and the first stator and a second rotating electric machine including the second rotor and the second stator. Rotating electric machine. 2. The first rotating electric machine includes a rotor having P1 pole pairs and s1 stator coils wound in a concentrated manner, and is driven by an alternating current of m1 phases. , A rotor having P2 pole pairs, and s2 stator coils wound in a concentrated manner.
S1 = P1 × m1, s2 = P2 × m2 P1 = k1 × m2, P2 = k2 × m1, where k1,
k2 is a natural number. When p1 = P1 / k1 and p2 = P2 / k2, the following relationship holds: p1 × m1 = p2 × m2. Circulating phase numbers are sequentially assigned from an arbitrary stator coil, and s1 stator coils are grouped into p1 groups including k1 sets of m1 stator coils having different phase numbers, and each group is assigned 1 to 1 group. A group number up to p1 is assigned, a phase number circulating between 1 and m2 is assigned to s2 stator coils of the second rotating electric machine in order from an arbitrary stator coil, and s2 stator coils are assigned to the s2 stator coils. When m2 stator coils having different phase numbers are grouped into p2 groups including k2 sets, and each group is assigned a group number from 1 to p2, The stator coils belonging to the group are connected to each other by Y connection or Δ connection, and one end of the stator coil of the first rotating electrical machine having the group number i and the phase number j is connected to the group number j and the phase number i. 2. The composite electric current driven rotary electric machine according to claim 1, wherein one end of a stator coil of a second rotary electric machine is connected. 3. A current to be supplied to a coil of the first stator, which is determined according to a difference between the number of rotations of the first rotor rotated by the torque input from the prime mover and the output shaft and a required torque. A current to be supplied to the coil of the second stator, which is determined according to an output shaft torque for driving the output shaft;
3. The composite current driven rotating electric machine according to claim 1, wherein a current having a sum of the following is supplied from the multi-phase inverter. 4. 4. A distribution of a current supplied to a coil of the second stator is determined for each pole pair of the second stator according to a value of a current supplied to a coil of the first stator. The composite current-driven rotary electric machine according to claim 1. 5. When an arbitrary phase current supplied to a coil of said first stator approaches an allowable current value of a power device forming said multi-phase inverter, said phase is selectively switched to a phase other than said phase. The rotating machine according to claim 4, wherein a current is supplied to the second stator.