Abstract：The precise stator resistance is very important when designing high performance sensorless controller for Interior permanent magnet synchronous motor(IPMSM). Using extended Kalman filter(EKF) to estimate rotor position, speed and stator resistance will be calculated with high order operational matrix and make the real system be heavy computation. To solve this problem, a novel Kalman control strategy by using nonlinear two-stage extended Kalman filter(NTSEKF) is proposed. Based on coordinate transformation, the main idea of NTSEKF is to decouple the EKF into two parallel low order filters. The NTSEKF is decomposition operation of EKF, and both of them are mathematically equivalent. Theoretical analysis and experimental results show that the novel strategy can reduce the number of arithmetic operations compared to the conventional extended Kalman filter and keep good performance of identification.
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2014, Vol. 29 
