Control of a permanent magnet excited synchronous machine

摘要

The method involves adjusting amount of stator current that flows during field impairing operation of a rotary field machine (9), to be smaller than maximum stator current, during non-field impairing operation of the rotary field machine. The field impairment takes place by a stator magnetic field that acts against field of permanent magnets. The stator magnetic field is caused by phase shifting (theta i) of the stator current. The stator voltage of the rotary field machine is pulse-width modulated using a modulator (7). An independent claim is also included for a converter for operation of the permanent magnet excited synchronous rotary field machine.