Bipolar or unipolar drive back-EMF commutation sensing method
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United States of America Patent
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Apr 13, 1993
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N/A
app pub date -
Nov 7, 1990
filing date -
Sep 25, 1989
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Expired
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Abstract
A method and apparatus to commutate the drive voltages of a brushless DC motor without sensors. The present invention determines rotor position and velocity by detecting the polarity reversal of the Back-EMF of an undriven leg when compared to the transformed reference. In an extra measure of efficiency, it includes a commutation delay timing circuit for optimization of motor operation, and it minimizes the participation of a microprocessor or other microcontroller.
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