Initial Rotor-Position Estimation Method for PMSMs Using Magnetic Saturation and Saliency

This paper proposes a rapid initial rotor-position estimation technique that simultaneously identifies the magnetic polarity and position of a permanent-magnet synchronous motor (PMSM), based on the magnetic saturation and saliency characteristics using the motor current caused by the voltage injection. The method is verified experimentally using an electric-vehicle motor. The experimental results show that the method rapidly and accurately estimates the initial rotor position.