The Research On Vector Control Method Of Dual Y Shift30Degree Permanent Magnet Synchronous Motor

Some potential advantages of multi-phase drives over the three-phase ones are:lower torque pulsations at high frequency；reduced rotor harmonic currents；reducedharmonic content of the DC link current in case of VSI fed drives and so on.Theseaspects can justify the higher complexity of the multi-phase drive in special customapplications, such as locomotive traction, industrial high-power applications, electricand hybrid-electric vehicles and the“more-electric” aircraft. These are the maindriving forces behind the rapid development of multiphase variable speed drives inrecent years.The focus of this paper is control methods of dual Y shift30degree permanentmagnet synchronous motor. The definition of multiphase motor phase number andmotor classification are introduced.The thesis focuses on analysis of the structure ofdual Y shift30degree permanent magnet synchronous motor. Mathematical models ofdual Y shift30degree permanent magnet synchronous motor are derived on thesix-phase stationary coordinate system. The article discusses coordinatetransformation among the six-phase stationary coordinate system, the two-phasestationary coordinate system and two-phase rotating coordinate system and obtainsthe coordinate transformation matrix.By coordinate transformation matrix,Mathematical models are also deduced on the two-phase stationary coordinate systemand the two-phase rotating coordinate system.The vector control methods of dual Y shift30degree permanent magnetsynchronous motor are described.The traditional PI control mode is given and thesimulation is carried out. In order to solve the speed overshoot and slower respond,the model reference adaptive fuzzy PI controller is introduced. A comparision amongdiffent controllers by simulation has been presented in this paper. It is showed that thedynamic performance using intelligent PI controller is better than the traditional PIcontrol. The installation of position sensor will increase the rotor shaft inertia;connection and interface circuits make the system vulnerable to interference andincrease the cost, therefore the sensorless control based on reduced order disturbanceobservers and adaptive velocity estimations is also provided and the simulation andexperiment are conducted in this paper.For the dual Y shift30degree permanent magnet synchronous motor adjustable speed system hardware and software implementations are conducted. A set ofadjustable speed system is developed and experimental verification of the adjustablesystem based on MRAFC is executed.