| Permanent magnet synchronous motors are widely used due to their high efficiency, high power density and no dc field winding in the rotor. In particular, Interior Permanent Magnet Synchronous Motor (IPMSM) drives are widely used in high performance drive applications because it has fast and accurate speed response and quick recovery of speed from any disturbances. Thus, the thesis focuses on the sensorless operation in the whole speed region, including zero speed is significant.This paper based on the structure and the mathematical model of PMSM proposes a new sensorless vector control method for permanent-magnet synchronous motors. And concluded that all of the methods for sensorless operation in the whole speed region have three basic features: deterministic spatial saliencies, persistent excitation, and noise filtering estimation with high bandwidth. With regard to the rotor position self-estimation scheme, the sensorless vector control method is featured by a new high-frequency voltage injection methods. The system simulation model is established with Matlab/Simulink secondly. Furthermore, selection of parameters are discussed in details to the method of high-frequency injection and Phase Locked Loop(PLL). The thesis using high frequency signal injection and simulation model is established to research how the method is used in vector control system of PMSM. Based on this sensorless control system detailed experimental results are obtained.The experimental investigation indicates that the rotor position self-estimation scheme, based on the rotor saliency-tracking approach, is capable of precisely estimating the rotor position and speed and the sensorless vector control of PM synchronous motor, using the proposed rotor position estimation method, possesses acceptable static and dynamic performance. Tracking the position of a spatial saliency allows the sensorless method not to be sensitive to parameter variations and possess good robustness. |
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