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the article citations: time:2017-06-04 17:55:07
the high-frequency (hf) circulating that may occur in the machines of the inverter-based drive systems can be reduced or even completely suppressed by the use of the or the insulated inner bearing seats. this paper proposes a method to calculate the influence of the thickness of the insulating coat on the obtained current reduction as a function of the several machine-design parameters. the parameters of the equivalent circuit are derived from an eddy-current model. the calculation considers the transient nature of the current flow. for the standard fan-cooled with up to 500-kw rated power, a minimum thickness of the insulating coat of 250 mum is required to reduce the to values where the apparent bearing-current density is less than 0.1 a/mm2, which is commonly taken as the threshold to the bearing failure.
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