Research On Control Strategy Of Dual Three-phase Permanent Magnet Synchronous Motor

Conventional three phase motor is not able to fulfill the functions in the applications which have demanding requirements towards power level,speed regulation,and reliability due to its own limitation.However,multiphase motor can be applied in such fields due to desired performance,such as small torque ripple and high reliability.Due to the demand of the market,more and more scholars have been devoted into the research of drive and control of multiphase motor.Therefore,this paper mainly contributes to the control strategy of a dual three phase permanent magnet synchronous motor(DTP-PMSM)with Y structure and 30 degree shift.Firstly,the mathematic model of this DTP-PMSM is introduced,and two kinds of models in rotational axes are obtained through dual dq transformation and space voltage vector decoupled transformation.Furthermore,the distribution of space voltage vectors and maximum four vectors SVPWM modulation technique are investigated.Based on that,the field oriented control(FOC)for DTP-PMSM drive is investigated and versus simulations are conducted in the Matlab/Simulink environment to test the effectiveness.Next,a proportional resonant(PR)regulator is presented in z1-z2 domain to diminish the stator current harmonic ripple.The effectiveness is verified through simulation.Secondly,in order to resolve the problems that PWM signal are unsymmetrical and the switching times of power switches are too long,a dual zero injection PWM control method is proposed for DTP-PMSM drive.Simulative model is built to confirm the effectiveness of proposed strategy.Finally,the design process of a DTP-PMSM drive prototype which is based on TMS320F28335 DSP is presented.The prototype includes hardware drive system and software control algorithm.Experiments are conducted on this platform and experimental results are consisting with simulation results,which demonstrate the effectiveness of proposed methods.