Research On Drive Control System Of A Less-Rare-Earth Tooth Yoke Magnetomotive Complementary Doubly Salient Permanent Magnet Motor

Rare-earth permanent magnet brushless motor has been widely used in many fields,such as industrial drive,aerospace,electric vehicle for its high power density,wide speed range and simple structure.However,due to the increasing price of rare earth,the cost of permanent magnet motor is also increasing,which restricts the development of permanent magnet motor to a certain extent.A Less-rare-earth tooth yoke magnetomotive complementary doubly salient permanent magnet motor(TYMC-DSPM)is studied in this paper,its excitation magnetic field is formed by the non rare-earth material ferrites and rare-earth material Nd Fe B.By reasonably designing the location and magnetizing direction of the two permanent magnets,the two magnetic fields can be reasonably complementary to each other in space and increase the air gap flux of the motor.This novel design not only reduces the usage of rare earth materials,but also ensures the power density and torque output capacity of motors,and reduces the cost of motor production,however,the motor has a high cogging force due to this special structure.Under the traditional vector control,the motor has an obvious torque ripple,especially at low speed,the motor will also has an obvious speed ripple and noise which leads to the decrease of motor performance.In order to verify the actual performance of the motor,this paper mainly researched the TYMC-DSPM control system and proposed an effective speed ripple suppression strategy to suppress the motor speed ripple.Firstly,this paper introduces the structure,operating principle and the mathematical model of the motor.Then,designed a control system for the motor based on a classical space vector control algorithm.In this system,the controller of the speed loop and current loop are PI controller.At last,MATLAB simulation and specific experiments are used to verify the actual performance of the TYMC-DSPM and the designed drive control system.When the motor operate at the low speed,the speed ripple is larger,the paper researches this problem from the points of theoretical analysis and experimental verification in detail.In order to reduce the motor speed ripple as possible,a method of parallel resonant regulator on current loop and speed loop PI controller is adopted to realize the compensation and error-free tracking for torque current.The resonant controller on the speed loop is used to generate compensatory torque current and the resonant controller on the current loop is used to error-free tracking for torque current.Finally,simulation and experiment are used to explore the operating performance of the motor with and without speed ripple suppression strategy.The results show that TYMC-DSPM can be controlled effectively without speed ripple suppression strategy,but the motor performance is poor.When the proposed speed ripple strategy is applied to the TYMC-DSPM control system,speed ripple of the motor can be suppressed effectively and the operating performance also can be improved.In addition,the performance of TYMC-DSPM can be well reflected in the control system designed by this paper,the speed ripple suppression strategy is also easy to achieve,which provides a reference for the research on speed ripple suppression method in the future.