Research On The Speed Control System Of 300W Switched Reluctance Motor Based On FPGA

Nowadays,due to electric vehicle industry is developing rapidly,research on motor drive technology has become a hot spot,which has enormous implications to motor efficiency improvement,energy conservation and emissions reduction.Switched reluctance motor(SRM)has characteristics with simple structure,no permanent magnet material and low cost.It is very suitable to be used as an electric vehicle drive source,and the related research has become one of the hot topics of new motor drive technology.For SRM drive system,the main research of this paper is as follows:In this paper,the structure and working principle of SRM drive system are introduced.Based on these,the ideal electromagnetic model is used to analyze basic electromagnetic relationship and operating characteristics of the motor.The principle of traditional speed adjustment modes is introduced.An angular control strategy based on excitation mode switching is proposed.The fuzzy self-adaptive control theory is introduced to optimize traditional PI controller to realize the speed control of SRM.In order to verify the feasibility of system design,the main parts of 300W(6/4)SRM drive system are modeled and simulated.The non-linear simulation model of the motor is established based on the results of static magnetic field analysis.In addition,a new type of inverter using sub-phase boost structure is proposed,which improves the phase voltage of secondary windings and the system operation efficiency.Finally,a SRM drive system based on FPGA is designed.The working principle and device selection of each part are introduced in this paper.And the main function logics of the control program are described in detail.The experimental results show that the system can effectively control the speed of the motor and meet the actual operational efficiency index.Compared with the traditional PWM voltage control method,the control strategy designed in this paper effectively improves the operation efficiency of the motor in the specified speed range.