Rotary electric machine control device

A rotary electric machine control device configured to control driving of a rotary electric machine having a motor winding, the rotary electric machine control device comprising:

• a plurality of inverter units each configured to switch current supply to the motor winding;
• and
• a plurality of control units configured to communicate with each other and each including a driving control unit configured to control a corresponding inverter unit, a mode selection unit configured to select a drive mode, an abnormality monitor unit configured to monitor an abnormality, and a storage unit configured to store abnormality information according to an abnormality monitor result, wherein
• a combination of each control unit and the corresponding inverter unit are defined as a system,
• the drive mode includes a cooperative drive mode, an independent drive mode, and a backup mode,
• the cooperative drive mode controls the current supply of the motor winding by a plurality of systems using a value acquired from another control unit by communication and a value calculated by the control unit,
• the independent drive mode controls the current supply of the motor winding, without using the value acquired from another control unit, such that an output of a subject system is a same as an output of the subject system when all of the plurality of systems drive,
• the backup mode controls the current supply of the motor winding by changing an output characteristic such that the subject system supplements an output of another system without using the value acquired from another control unit,
• the mode selection unit sets, as a normal drive mode, the cooperative drive mode,
• when an incoordination abnormality which is a communication abnormality or a synchronization abnormality between the plurality of control units is detected, the mode selection unit switches the drive mode from the cooperative drive mode to the independent drive mode,
• after the drive mode is switched to the independent drive mode, the output characteristic is not changed until a stop of another system is determined based on another system monitor information that is relay information of another system acquired separately from communication between the plurality of control units, and
• when the stop of another system is determined based on the another system monitor information, the mode selection unit switches the drive mode from the independent drive mode to the backup mode and the output characteristic is changed so as to supplement an output of another system.