METHOD AND DEVICE FOR MEASURING INDUCTANCE OF PERMANENT MAGNET SYNCHRONOUS MOTOR, AND PERMANENT MAGNET SYNCHRONOUS MOTOR

摘要

A method for measuring an inductance of a permanent magnet synchronous motor includes the steps of applying to a stator of a stationary portion of the permanent magnet synchronous motor a measuring voltage having an electric angular velocity at which a rotary portion is not rotated, in parallel with the previous step, measuring a response current flowing through the stator by using a static phase of the rotary portion that is kept stopped with respect to the stationary portion, determining a differential value of the response current by using a digital filter, and obtaining an inductance of the stator by inputting the response current and the differential value of the response current to a converter prepared in advance.