Synchronous machine control device, synchronous machine control method, and electric vehicle

A synchronous machine control device that controls a power converter that supplies electric power to a synchronous machine, the synchronous machine control device comprising:

• a first magnetic flux command computation unit that computes a first magnetic flux command value in a rotating coordinate system from a current command value in the rotating coordinate system;
• a magnetic flux estimation unit that estimates a magnetic flux value of the synchronous machine in the rotating coordinate system from a current detection value of the synchronous machine in the rotating coordinate system;
• and
• a voltage computation unit that creates a voltage command value of the power converter such that the first magnetic flux command value coincides with the magnetic flux value,
• wherein:
• the first magnetic flux command value in the rotating coordinate system includes a first d-axis magnetic flux command value and a first q-axis magnetic flux command value,
• the current command value in the rotating coordinate system includes a d-axis current command value and a q-axis current command value,
• the magnetic flux value of the synchronous machine in the rotating coordinate system includes a d-axis magnetic flux value and a q-axis magnetic flux value,
• the current detection value of the synchronous machine in the rotating coordinate system includes a d-axis current detection value and a q-axis current detection value, and
• the voltage computation unit that creates a voltage command value of the power converter such that the first d-axis magnetic flux command value coincides with the d-axis magnetic flux value and the first q-axis magnetic flux command value coincides with the q-axis magnetic flux value.