Method and apparatus for commutation of a brushless dc motor
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United States of America Patent
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-
Jan 5, 1993
Grant Date -
N/A
app pub date -
Aug 6, 1991
filing date -
Aug 6, 1991
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An apparatus and method for the commutation of a brushless dc motor having a rotor and a plurality of coils, and an encoder generating quadrature signals responsive to the rotation of the rotor. The commutation apparatus comprises a commutation control device, coupled to the encoder, for controlling the sequence of motor coil energization utilizing the quadrature signals. The commutation method utilizes the quadrature signals for composite signal generation, rotor rotational direction and position to achieve precise commutation. Precision commutation is achieved without the need for any additional commutation sensing devices.
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