Abstract
AbstractAiming at the problem of electromagnetic thrust fluctuation of permanent magnet synchronous linear motor (PMLSM), a design method of the magnetic pole of PMLSM is proposed based on the pulse width modulation. The equal area control method is used to modulate the width of the permanent magnets. And a magnetic pole composed of permanent magnet arrays of PMLSM is proposed. Simulation analysis was carried out for both the conventional and the proposed PMLSM respectively. And the air gap magnetic field generated by the two types of magnetic pole was experimentally measured. Both simulation and experimental results show that the magnetic pole consists of permanent magnet arrays can significantly reduce the harmonic content of the air gap magnetic field, making the air gap magnetic field and the no-load back-EMF waveform closer to a sine wave, effectively reducing electromagnetic thrust fluctuations.KeywordsPMLSMPulse width modulationMagnetic field analysisThrust fluctuationHarmonic analysis
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