Motor controller, washing machine, air conditioner and electric oil pump

摘要

A motor controller (1, 1b) capable of suppressing a large speed change generated at the time of changeover from a synchronous operation mode to a position feedback operation mode and implementing even acceleration characteristics regardless of the load torque (Ä) by estimating a torque of a permanent magnet motor (6) in the synchronous operation mode for driving the permanent magnet motor and setting an initial value of a current command value in a position sensor-less operation mode on the basis of information of the torque estimated value (Ä^).