Research On Control System Of Six-phase Permanent Magnet Synchronous Motor Based On Model Design

Compared with the traditional three-phase motor,the multi-phase motor has the advantages of low voltage and high power output,low torque ripple,and suitable for fault-tolerant operation.However,with the increase of the motor phase number,its control algorithm and PWM strategy become more complex,resulting in large harmonic current and increased stator loss.At the same time,the application and development of traditional electromechanical systems have some problems,such as long development cycle,high cost and low efficiency.Therefore,this thesis takes a symmetrical six-phase permanent magnet synchronous motor as the research object to study its control algorithm and PWM strategy and develops the motor system based on model design.The main research contents are as follows:(1)A fast model verification platform for six-phase permanent magnet synchronous motor is designed.Aiming at the problems of low development efficiency and long cycle of traditional motor system,the advantages of model design are used to shorten the development cycle of the control system and improve the maintainability and reliability of the control system in the later period.On this basis,combined with Simulink and STM32CubeMX software to build the overall model of the motor fast model system,as well as current detection,position and speed calculation and PWM signal output interface modules,and the main hardware resources parameter configuration,for the subsequent algorithm of the overall model building and code generation laid the foundation.(2)The dual d-q magnetic field orientation control system of six-phase permanent magnet synchronous motor is studied.In view of the problems of large harmonic current and complex control algorithm of polyphase motor,the six-phase motor was decoupled into two three-phase systems by dual d-q coordinate transformation to simplify the algorithm,so as to complete the separate control of the d and q axis current of the two sets of windings,and the inverter was controlled by SPWM and SVPWM strategies respectively.At the same time,the algorithm simulation and fast model verification platform are combined to generate the corresponding code.On this basis,the hardware experiment platform was designed and used to verify the hardware,further verifying the suppression effect of dual d-q magnetic field oriented control on harmonics and the effectiveness of the model design and development method.(3)The direct torque control system of the six-phase PMSM was studied.To address the complex control algorithm and PWM strategy of multiphase motors,hysteresis controllers and vector switch tables were used to directly control the on and off states of the inverter for optimal control,thereby improving the speed and accuracy of motor torque control.Meanwhile,algorithm simulation analysis was conducted using Simulink,and the corresponding code was generated based on the simulation algorithm and the fast model validation platform.On this basis,hardware validation was conducted through an experimental platform,further verifying the simple structure and fast operation speed of the direct torque control.