Abstract

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Title:: Harmonic analysis of armature current for high speed permanent magnet synchronous motor

Author(s):: YU Ji-kun; LI Li-yi; DU Peng-cheng; ZHANG Jiang-peng; ( School of Electrical Engineering and Automation，Harbin Institute of Technology，Harbin 150001，China)

Keywords:: high speed permanent magnet synchronous motor; space vector pulse width modulation ( SVP-WM) ; armature current; harmonic analysis; discrete fourier transform ( DFT)

Abstract:: There are two methods in harmonic analysis of the high speed permanent magnet synchronous motor，and they are analytical method and simulation method． The analytical method is suitable for con-tinuous systems，and the simulation method for discrete system． As the relevance of these two methods has been rarely studied，one correlation analysis method was proposed，which is based on the space vector pulse width modulation ( SVPWM) technology． From Fourier series of the continuous function and the discrete function，the deviation distribution law between these two methods in the harmonic calculation was analyzed． The analysis results show that the main influence factors of discrete harmonic calculation of ar-mature are sampling frequency and load condition． The armature current harmonics oscillate damping at-tenuation with increase in sampling frequency and converge to the analytical results of the continuous sys-tem． The oscillation amplitude is reduced and the convergence speed is improved by load． The permanent magnet synchronous motor system experiment platform based on DSP is constructed，and it is confirmed that the correlation analysis method is effective．