| In recent years, the rapid development of modern power electronics technology, modern control theory and the permanent magnetic materials have improved the efficiency, reliability and fault tolerance of fault-tolerant permanent magnet motor (FTPMM), and the application of FTPMM has got more and more attention in electric drive system. The control technology without position sensor of FTPMM has become a research hotspot in order to increase reliability and reduce costs of the system. Position sensorless control system of FTPMM can be used in some special occasions for its advantages of simple structure, high operation efficiency and small volume. Therefore, the research of position sensorless vector control technology of FTPMM has high academic value and broad application prospects.The structure and characteristics of FTPMM was introduced after reading a lot of related literature. The FTPMM mathematical models under three different coordinate systems were established to achieve decoupling control of the motor. The basic principle of sliding mode variable structure was analyzed and the synovial observer to estimate the rotor position and speed was designed combining sliding mode variable structure and mathematical models of FTPMM. Synovial Observer was improved to eliminate buffeting and increase the accuracy of estimation. Then three-phase H-bridge was analyzed and designed for FTPMM vector control system based on SVPWM technology and hysteresis technology. Fault tolerant control strategy was derived according to the characteristics of FTPMM and applied in the fault tolerant control system when winding failures occurred.Finally, simulation model of FTPMM vector control system based on synovial observer was designed in MATLAB under various operating conditions and faults conditions. The effectiveness and superiority of FTPMM position sensorless vector control system was verified through research and analysis of the simulation results. |
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