Permanent magnet synchronous electric motor control device, electric power steering device, and electric vehicle

A control device for a permanent magnet synchronous motor including a first winding and a second winding, the control device comprising:

• a first power converter configured to apply a voltage to the first winding;
• a second power converter configured to apply a voltage to the second winding;
• a first power supply circuit configured to supply power to the first power converter;
• a second power supply circuit configured to supply power to the second power converter at a voltage higher than a voltage of the first power supply circuit;
• a current command calculator configured to calculate a first current command being a target value of a current caused to flow through the first winding, and a second current command being a target value of a current caused to flow through the second winding;
• a first current controller configured to control an output voltage of the first power converter in accordance with the first current command;
• and
• a second current controller configured to control an output voltage of the second power converter in accordance with the second current command,
• wherein the current command calculator is configured to calculate a first voltage usage state, which is an indicator value correlated with a magnitude of the output voltage of the first power converter with respect to a power supply voltage output at a time of supply of power by the first power supply circuit, and calculate the second current command based on the first voltage usage state.