Abstract
The insulation system’s dielectric of the electric motor is very often subjected to severe electrical stress generated by the high dv/dt seen at the machine’s terminals. The electrical stress and high reflected wave transient overvoltage are even more evident in case of high-speed machines fed by high-frequency (HF) converters featuring very fast wide-bandgap devices. They are promoting the occurrence of partial discharges and consequently accelerate ageing. As this is serious issue and the main cause of the drive failure, it is important to analyse and characterise the surges at the motor terminals. Several HF models of motors have been proposed in the literature for this purpose. This article presents a survey on HF motor models, which is crucial in understanding and studying the most critical parameter identification and overvoltage mitigation techniques. Moreover, it offers a comparison of the models’ main features as well as a comparison with the experimental voltage waveform at motor terminals. A general overview of the partial discharge (PD) phenomenon is also provided, as it is favoured by HF operation and together with HF motor modelling provides key insights to the insulation ageing issue. In particular, an analysis of the effects of PWM waveform affecting insulation is given, as well as useful methods for developing strategies for the inspection and maintenance of winding insulation.
Highlights
In the automotive and aerospace industry, to address in a better way the reliability and efficiency requirements for new high-speed electrical drives, it is necessary to implement new power electronic converters using new wide-bandgap semiconductor devices (WBGs) [1,2,3]
In recent years the partial discharge has become of great scientific interest, as it has been shown that it causes premature breakdown of the stator winding insulation of electrical machines powered by power electronic converters
From the results highlighted in the works of Wang et al [62,63,64], it emerges that statistically the effect of the frequency of pulse width modulation (PWM) signals has a direct relationship on the generation and amplitude of partial discharges
Summary
Davide D’Amato 1, *,† , Jelena Loncarski 2,† , Vito Giuseppe Monopoli 1,† , Francesco Cupertino 1,† , Luigi Pio Di Noia 3,† and Andrea Del Pizzo 3,†.
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