This paper presents the effects of inverter non-linearity, current sampling deviation and high frequency injected signal on vibration for a marine permanent magnet propulsion synchronous motor (PMSM) without position sensor. By using an embedded notch filter, major character- ristic harmonics contained in position estimated and motor vibration are attenuated, and high frequency noise signal is suppressed at the same time. A random algorithm based on a two-state Markov chain is presented to realize randomization of injected frequency. The random algorithm is effective in homogenizing current spectrum and reducing motor vibration peak value caused by high frequency signal injected. Finally, the correctness of theoretical analysis and effectiveness of the proposed strategy are verified by simulation.

marine permanent magnet synchronous motor; high frequency injection; vibration reduction; notch filter; Markov chain

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