Drive circuit for brushless DC motors
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United States of America Patent
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-
May 7, 2002
Issued Date -
N/A
app pub date -
Feb 10, 1998
filing date -
Oct 3, 1991
priority date (Note) -
Expired
status (Latency Note)
Importance
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 supplied commutation pulses of drive current to the state 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 ignition part of a commutation pulse and the extinction part of such pulse.
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