Control device of multi-phase rotating machine

1. A control device of a multi-phase rotating machine ( 80 ) having two systems of components regarding energization to two systems of multi-phase windings for a drive thereof, the control device comprising:

two systems of power converters capable of individually energizing the multi-phase windings in the two systems; and

two systems of arithmetic units separately provided for controlling flow of electric current from the power converters to the multi-phase windings based on a detected current flowing in the multi-phase windings detected by current detectors, wherein

the arithmetic units of the respective systems communicate at least one kind of information via inter-system communication at least in one direction,

perform current control calculation of the electric current flowing in the multi-phase winding of a subject system in a cycle shorter than a communication cycle of the inter-system communication, and

calculate, for a decoupling control, a decoupling control amount of the electric current flowing in the multi-phase windings of the subject system regarding a voltage generated in the multi-phase winding of the subject system by the electric current flowing in the multi-phase winding of an other system by using an estimated current that is calculated based on a current instruction value of the subject system or of the other system.

2. The control device according to claim 1 , wherein

the estimated current is calculated by a current controller and a rotating machine model based on a current instruction value of the subject system or of the other system.

3. The control device according to claim 1 , wherein

wherein the arithmetic unit of at least one system calculates the current instruction value based on an input signal, and transmits the current instruction value to the arithmetic unit of the other system.

4. The control device according to claim 1 , wherein

the arithmetic units of the respective systems communicate at least abnormality information of the respective systems bidirectionally by the inter-system communication, and

calculate the estimated current,

based on an assumption that the subject system is normal,

and based at least on the current instruction value calculated by the arithmetic unit of the subject system, or the current instruction value calculated by the arithmetic unit of the other system and obtained by the inter-system communication, and

calculate the estimated current based on the current instruction value calculated by the arithmetic unit of the subject system when the other system is abnormal or the communication is abnormal.

5. The control device for a multi-phase rotating machine according to claim 1 , wherein

the arithmetic units of the respective systems correct the estimated current based on an actual current flowing in the multi-phase winding of the subject system.

6. The control device for a multi-phase rotating machine according to claim 1 , wherein

the arithmetic units of the respective systems correct the estimated current based on an actual current flowing in the multi-phase windings of the other system.

7. The control device for a multi-phase rotating machine according to claim 1 , wherein

the arithmetic units of the respective systems communicate an actual current flowing in the multi-phase windings of the respective systems and abnormality information of the respective systems bidirectionally by the inter-system communication, and

based on an assumption that the subject system is normal,

correct the estimated current based on an actual current of the other system when the other system is normal and communication is normal, and

correct the estimated current based on the actual current of the subject system when the other system is abnormal or when the communication is abnormal.

8. The control device for a multi-phase rotating machine according to claim 3 , wherein

the inter-system communication is performed via a vehicle network.

9. The control device for a multi-phase rotating machine according to claim 3 , wherein

the inter-system communication is performed inside the control device.

10. A method for controlling a multi-phase rotating machine that reduces communication load in decoupling control by two systems of arithmetic units, the method comprising:

calculating current control of an electric current flowing in a multi-phase winding of a subject system in a cycle shorter than a communication cycle of an inter-system communication, and

calculating, for a decoupling control, a decoupling control amount of the electric current flowing in the multi-phase windings of the subject system regarding a voltage generated in the multi-phase winding of the subject system by the electric current flowing in the multi-phase winding of an other system by using an estimated current that is calculated based on a current instruction value of the subject system or of the other system.

11. The method according to claim 10 , wherein

the estimated current is calculated by a current controller and a rotating machine model based on a current instruction value of the subject system or of the other system.

12. The method according to claim 10 , wherein

the arithmetic unit of at least one system calculates the current instruction value based on an input signal, and transmits the current instruction value to the arithmetic unit of the other system.