Research on Drive and Fault-tolerantcontrol Technologies of Dual Three-phase Permanent Magnet Synchronous Motor

With the rapid development of power electronics, the motor drive systems have got rid of the phase number constraint form traditional three-phase power supply network. Multiphase motors enjoy the advantages of low-voltage highpower, low-torque pulsation, and good fault tolerant ability. They are suited for application fields such as electric vehicles, wind power generation, and aerospace applications. With the dual three-phase permanent magnet synchronous motor(PMSM) as the research object, the mathematical modeling, harmonics suppression, overmodulation, and fault tolerant control strategies are deeply studied in this dissertation.Firstly, the magnetic motive force(MMF) harmonics of multiphase motor windings are analyzed, and it reveals the theoretical foundation of the low-torque pulsation characteristic for dual three-phase PMSM. The model of dual three-phase PMSM is built up according to the vector space decomposition(VSD) theory.