Characteristics Simulation Of The Six-phase Permanent Magnet Synchronous Motor

This thesis chooses the six-phase permanent magnet synchronous motor as the subject to research. First, the control model of Space Vector Pulse Width Modulation (SVPWM) is founded and the simulation model of six-phase inverter is set up by means of the concept of switch function. Second, the mathematical model of six-phase permanent magnet synchronous machine is developed in stationary a-b-c frame at the base of the multi-loop theory. According to magnetic conductance analytical method Inductance is calculated and the expressions of it and inductance leakage is deduced. Finally, the simulation model based on SIMULINK is achieved and the whole system performance simulation respectively on dynamic and steady situation is provided.With advantages such as higher usage of DC voltage, adapt to digital-control and the capacity of building high performance speed regulation system, Space-Vector-Pulse-Width-Modulation (SVPWM) is a better method than Sinusoidal Pulse Width Modulation in field of AC motor speed regulation. SVPWM Control principle and modulation method are analyzed first, then a SVPWM converter model is established and under a simulation example, the results, show that the SVPWM model is more effective in reducing harmony wave.Multiphase motor system is suit for the occasions that require high power and reliability, for example galley, under-ship propulsion system and nuclear power station's cycle water system, because it can supply high power, reduce torque ripple and improve the reliability of the system. At present, it has been successfully applied to the six-phase PMSM propulsion system of America army. Based on the actual physical elements, a Multiphase motor State-space mathematical model is established and then according to it the S-Function model is founded. Powered with the converter founded early, the Multiphase motor system is simulated respectively on dynamic and steady situation which including starting and breaking characteristics and steady-state characteristics, the results validate the rationality of the model. On above basis, the fault-operation performance of the system is simulated to demonstrate the system's speciality of stability.