Pulse width modulation algorithm and simulation based on linear motor

LIN Feng， DENG Xiao-lei
（Department of Mechanical Engineering， Quzhou University， Quzhou 324000， China）

Abstract： In order to solve the problem of computational complexity and reduce the difficulty on implementing digitization with space vector pulse width modulation（SVPWM），a novel rapid algorithm for SVPWM was proposed based on the comprehensive analysis of the control principle of permanent magnet linear synchronous motor（PMLSM）. The sector judgment and the calculation of switching time can be calculated based on the data from the displacement sensor of PMLSM. Finally，the model of the algorithm was established in Matlab/Simulink. The simulation results show that the novel algorithm is practical and feasible，the problems of low response and low control accuracy from inverse tangent calculation in conventional SVPWM is solved.
Key words： space vector pulse width modulation（SVPWM）；permanent magnet linear synchronous motor（PMLSM）；harmonic analysis；voltage modulation ratio