Research On The Control Technology And Iron Loss For High-speed Doubly Salient Electromagnetic Motor

The doubly salient electro-magnetic motor has simple structure,adjustable excitation,low cost and high reliability.In today's rapid economic development,the doubly salient electro-magnetic motor has broad application prospects in several fields,such as aviation power supply systems,new energy power generation systems,electric vehicles and smart household appliances and so on.Increasing the running speed of the motor not only improves the power density of the motor,but also allows the motor to directly drive the high-speed load and reduce the volumetric weight of the system.However,when the motor is running in high-speed operation,it will increase the wind and friction loss of the motor and the core loss,reduce the operating efficiency of the motor,and shorten the service life of the motor.In this paper,a high-speed doubly salient electro-magnetic motor and its commutation control strategy is studied.The appropriate advance angle is selected to obtain higher output torque.And compare the motor loss and motor operating efficiency when using different commutation strategies,choose the appropriate commutation strategy,and obtain higher motor operating efficiency.Firstly,the structure of the doubly salient electro-magnetic motor is introduced,the working principle is analyzed,and the mathematical model of the motor is established.Based on these conclusions,the four commonly used commutation control strategies are compared.By analyzing the armature current of each commutation strategy,the respective operating characteristics and output torque are analyzed in detail.The ANSYS software was used to build the finite element simulation model.The motor running state under different commutation strategies was simulated.The influence of the advance angle on the motor output characteristics was analyzed.For different commutation control strategies,the appropriate advance angle was selected to make the motor outputting maximum torque.In addition,the finite element analysis method is used to calculate the motor loss value and operating efficiency under different commutation control strategies.The influence of the advance angle and the on-time of the switching circuit of the inverter circuit on the motor loss is studied..Comparing the operating efficiency of the motor under different commutation strategies,the combination of the advance angle of the motor output efficiency is selected,and compared with the advance angle of the motor output torque.Finally,a high-speed doubly salient electro-magnetic motor drive test platform was built and digital control was adopted.In order to improve the response speed of the program and improve the high-speed operating conditions of the motor,the drive system is controlled by DSP and FPGA.The experiment compares the output characteristics of the commutation control strategy,compares the motor loss and operating efficiency under different commutation strategies,and verifies the results of the simulation analysis.