Drive circuit for brushless DC motors
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United States of America Patent
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app pub date -
Mar 19, 2002
filing date -
Oct 3, 1991
priority date (Note) -
Abandoned
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Abstract
A drive circuit for brushless DC motors including a rotor and a stator with at least one stator coil includes a commutation device which supplies commutation pulses of drive current to the stator coil(s). The commutation device senses the rotor position and calculates current rotor speed therefrom. The rotor speed is then used to shift the commutation circuits according to predetermined functions. The shifting of commutation currents is occasioned by shifting either or both of the ignition part of a commutation pulse and the extinction part of such pulse.
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