Sensorless IPMSM drive with EKF estimation of speed and rotor position

In this paper, a new sensorless interior permanent magnet synchronous motor (IPMSM) drive method with extended Kalman filtering (EKF) estimation of speed and rotor position is proposed. This method is developed so as to be able to be applied to motors with salient pole like IPMSM on the basis of the sensorless surface permanent magnet synchronous motor (SPMSM) drive [S. Bolognani, et al., 1999] that can be applied to motors with no salient pole. The features of the method are that rotor position estimation error is caused by just motor speed change and differences of motor elements (e.g. resistor and inductance) between model and real motor, and that the method can be applied with arbitrary motor voltage waveform. So the method is suitable for sensorless IPMSM drive. Numerical simulations are illustrated to verify the effect of the method.