Method and device for measuring an inductance of a permanent magnet synchronous motor and permanent magnet synchronous motor

摘要

A method of measuring an inductance of a permanent magnet synchronous motor (1), comprising the steps of: (a) applying, to a stator (111) of a stationary unit (11) of the permanent magnet synchronous motor (1), a measuring voltage (νB 1h) at an electrical angular velocity with which a turntable (12) is not rotated; (b) in parallel with step (a), measuring a response current (iB 1h) flowing through the stator (111) by using a static phase (θα) of the rotary unit (12) stopped with respect to the stationary unit (11) remains; (c) finding a difference value of the response current (iB 1h) by using a digital filter (241); and (d) obtaining an inductance of the stator (111) by inputting the operating current (iB 1h) and the difference value of the operating current (iB 1h) into a converter (242) prepared in advance.