Research Of Control System For Dual-Redundancy Permanent Magnet Synchronous Motor

This paper mainly studies the control system of"dual-redundancy permanent magnet synchronous motor(DRPMSM)with weak thermal coupling and no electromagnetic coupling"which is funded by the National Natural Science Foundation of China.This paper focuses on the hardware and software of the vector control system of the DRPMSM,and mainly studies the torque ripple suppression strategies of the DRPMSM after inter-turn short circuit.At the same time,the problem of dead-zone compensation of inverter-driven DRPMSM is studied.First of all,the mathematical model of the DRPMSM proposed by our group with weak thermal coupling and no electromagnetic coupling is established.Using i_d=0 control strategy,the vector control system of the DRPMSM is built in MATLAB/Simulink.The DRPMSM adopts current and speed double closed-loop control strategy.The output of the speed regulator is taken as the cross-axis current reference values of the two sets of windings respectively.Aiming at the problem that the control system of DRPMSM driven by inverter is distorted due to the effect of dead zone,the current waveform of dual-redundancy permanent magnet synchronous motor is distorted.Based on current polarity judgment of permanent magnet synchronous motor,the dead zone compensation strategy of inverter is proposed.Secondly,in the single-redundancy operation mode of DRPMSM after the inter-turn short-circuit fault occurs,the interaction between the current of short-circuited coils and permanent magnetic field not only produces a brake electromagnetic torque corresponding to the copper loss of short-circuited coils,but also produces an alternating electromagnetic torque with a doubled supply power frequency.Then,a control method for suppressing the electromagnetic torque ripple of a short-circuited coil is proposed for the first time by using an improved adaptive proportional resonant(PR)controller and a proportional integral(PI)controller in parallel.When the coil is short-circuited,the PR controller is connected in parallel with PI controller in speed loop to effectively suppress alternating electromagnetic torque,which makes the motor speed more stable.Finally,a hardware system based on Digital Signal Processing(DSP)TMS320F2812 is proposed.