Method of controlling a brushless permanent-magnet motor

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United States of America Patent

PATENT NO 9438149
APP PUB NO 20140368138A1
SERIAL NO

14304658

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Abstract

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A method of controlling a brushless permanent-magnet motor. The method includes dividing each half of an electrical cycle of the motor into a conduction period followed by a primary freewheel period. The conduction period is then divided into a first excitation period, a secondary freewheel period, and a second excitation period. The method then involves exciting a winding of the motor during each excitation period and freewheeling the winding during each freewheel period. The secondary freewheel period has a position and length within the conduction period that acts to reduce the harmonic content of current in the winding relative to back EMF in the winding. As a result, the efficiency of the motor is improved.

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Patent Owner(s)

Patent OwnerAddress
DYSON TECHNOLOGY LIMITEDMALMESBURY WILTSHIRE SN16 0RP

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Celik, Tuncay Swindon, GB 30 568
Zheng, Libo Swindon, GB 13 96

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