Research On Inverter Applied To Low Inductance Permanent Magnet Synchronous Motor

Some special permanent magnetic synchronous motors such as: ultra-high speed,high overload multiples and slot-less PMSM with stator inductor is much smaller than the characteristics of conventional PMSM,low inductive causes constant torque range widening,electrical time constant shorter,dynamic response to the current faster,to the design of the motor controller has brought challenges.In view of the use of conventional PWM variable frequency control for low inductive PMSM:winding current ripple large,permanent magnet affected by the air gap magnetic field space harmonics,motor loss and high temperature increase,and so on,the design of a coupling inductive inductor parallel inverter,on this basis,the introduction of carrier shift phase strategy,without increasing the power device switch frequency,to achieve the control effect of the approximate multi-level inverter.Taking a surface mount PMSM as the research object,the PI regulator of the current ring and speed ring of the motor driver is designed,and the factors affecting the response speed of the current and speed rings are analyzed,the torque fluctuation of the motor is tested,and the speed fluctuation is suppressed based on the quasi-resonant link.Based on MATLAB/Simulink,a simulation model of permanent magnetic synchronous motor-parallel inverter is constructed,and the simulation analysis of carrier shift phase control strategy and speed fluctuation suppression strategy is carried out,and the simulation shows that:Parallel inverter uses carrier shift phase control strategy to reduce the current ripple of the PMSM and DC bus,and can effectively suppress the speed fluctuation caused by the motor torque fluctuation under the ASR with quasi-resonant.Based on TMS320F28377,a parallel inverter is designed,and a PMSM-inverter test platform is built,and the parameters of the current loop and speed loop PI regulator are verified to be accurate,and the strategy of carrier phase shift suppression of current ripple and quasi-resonant suppression of speed fluctuation is feasible.