Encoderless vector control of interior PMSM with initial states

This paper describes the initial rotor position estimation of Interior permanent magnet synchronous motor (IPMSM) without position sensor. The High frequency rotating voltage signal can be injected in the stationary reference frame to estimate the magnetic pole position. The position error can be regulated to zero by using a PI tracing observer position estimator. A comparison of this scheme with a Luenberger observer position estimation scheme is carried out. The simulation results confirms better accuracy of the Luenberger observer position estimation scheme.