Permanent magnet synchronous motor control device, has rotor magnetic pole position estimation section estimating rotating position of rotor of synchronous motor as rotor magnetic pole position based on detected current changing rate

摘要

The device (1) has a current changing rate detection section detecting an change rate of phase current flowing through a synchronous motor (M) as a current changing rate, when a zero-voltage vector is produced. A rotor magnetic pole position estimation section estimates a rotating position of a rotor of the synchronous motor as a rotor magnetic pole position based on the current changing rate detected by the current changing rate detection section.