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This paper proposes a reducing technique of carrier noise of PWM inverters without increasing the carrier frequency during zero-speed drive of a permanent magnet motor. The feature of the proposed technique is that the frequency component of the carrier noise is diffused by zero-sequence voltage. In particular, the zero-sequence voltage is randomized by the M-sequence signal and added to the voltage...
Gearboxes are widely used and subjected to progressive deterioration which makes box condition monitoring a relevant topic in the servodrive industry. This paper proposes a novel scheme for performing integral condition monitoring in a drive containing a gearbox. The proposed scheme is based on a modified MCSA scheme (motor current signature analysis) that uses the drive rectifier input currents instead...
The paper presents a model of a poly-phase permanent magnet motor of the marine propulsion drive energized by multistage VSI. The model defines more precisely the non-sinusoidal waveform of back-EMF and its impact on the current distortion and electromagnetic torque ripples. The paper concludes by analyzing simulation results that have shown significant suppression of high order current harmonics...
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