Research And Experiment On Direct Torque Control Of Switched Reluctance Motor

Switched Reluctance Motor(SRM)has the characteristics of simple structure,large starting torque,small starting current,good speed performance and so on.However,due to the salient structure and the nonlinear magnetic field of the SRM,it has large noise and torque ripple,which limitied its application.This paper focused on the Direct Instantaneous Torque Control(DITC)of SRM.In order to decrease the torque ripple of SRM,two improved TSF methods were proposed.After analyzing the basic structure and working principle of SRM,the mathematical model of SRM was introduced in detail.The advantages and disadvantages of several basic control methods of SRM were analyzed.Then Finite Element Analysis(FEA)was adopted to establish the relationship among torque,current and rotor position angle of SRM.Secondly,the theory of DITC was introduced in detail.Then two improved methods were proposed,including: fixed turn-on angle(θon)and fixed the conduction angle(θc)with 15 degree in Torque Sharing Function(TSF).The principle and the advantages of two improved methods were analyzed theoretically.Then the construction of Matlab/Simulink simulation model was given.The feasibility of the two improvement strategies was validated by the simulation waveform and the results of the simulation.Finally,an 11 kW 12/8 poles 3-phases SRM and a DSP were used to build an experimental platform.Then the software program was designed.The motor current,torque and speed waveform were analyzed though the no-load,load and variable load experimental results.The results showed that the proposed methods achieved better results in all kinds of experiments in controling SRM.