Estimation of resistance in electrical machines

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United States of America Patent

PATENT NO 9575104
APP PUB NO 20140159754A1
SERIAL NO

14095961

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Abstract

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In an electrical machine which has unidirectional excitation applied to its windings, the mean values of voltage and current can be computed from the instantaneous phase voltage and current by the use of, for example, low-pass filters (in either the analogue or digital domain). The value of winding resistance can then be calculated by dividing the mean voltage by the mean current. This avoids the cost, fragility and potential inaccuracy of conventional temperature sensors, and provides the controller with an ongoing estimate of winding temperature.

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Patent Owner(s)

Patent OwnerAddress
NIDEC SR DRIVES LTDEAST PARK HOUSE OTLEY ROAD HARROGATE NORTH YORKSHIRE HG3 1PR

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Turner, Michael James Whixley, GB 18 251

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