Motor control device

A motor control device comprising at least two systems, which include an own system and an other system forming a target system pair, and capable of controlling current supply to a motor, wherein each system includes:

• a power converter configured to perform power conversion between a DC power input from an individual power supply and an AC power generated by the motor in accordance with a power running state and a regeneration state;
• and
• a microcomputer configured to execute processing of calculating a current command value of a current flowing in the motor, and calculating a voltage command value of a voltage of the power converter of the own system by feeding back an actual current relative to the current command value;
• each microcomputer of the target system pair is configured to communicate information of the own system and the other system by inter-computer communication and has an independent ground potential;
• each microcomputer of the target system pair monitors a detection value or an estimated value of the power supply current of each system by the inter-computer communication or information which enables estimation of the power supply current of each system, and executes a power supply current balancing process of limiting the current command value or the voltage command value of at least one of the systems thereby to decrease a power supply current difference between the two systems when the power supply current difference between the two systems exceeds a target power supply current difference.