Effect of Pulsewidth Modulation on Electromagnetic Noise of Interior Permanent Magnet Synchronous Motor Drives
IEEE Transactions on Magnetics(2019)
摘要
This paper investigates acoustic noise when an electric motor is fed with three-phase pulsewidth-modulated (PWM) currents with varying modulation indices. The procedure involves using a data-driven process to create a design space for different geometries of an interior permanent magnet synchronous motor. The motor structures are then analyzed using a finite-element analysis package to extract knowledge related to the sound pressure levels from the PWM excitation. It is demonstrated that sampling the air-gap space at a single time instant, which is a routine procedure in acoustic noise calculations, can result in an inaccurate estimation of the sound pressure levels, especially when the noise source is PWM motivated. Multiple-time sampling over the electrical period is proposed as a better approach for analyzing the sound pressure levels, irrespective of the type of supply current quality.
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关键词
Pulse width modulation,Harmonic analysis,Stators,Air gaps,Acoustic noise,Atmospheric modeling
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