Control device of multi-phase rotating machine

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.