Bipolar or unipolar drive back-EMF commutation sensing method

Details Bipolar or unipolar drive back-EMF commutation sensing method Bipolar or unipolar drive back-EMF commutation sensing method

1990-11-07

1993-04-13

Wysocki, Jonathan

Electricity: motive power systems

Switched reluctance motor commutation control

318439, H02P 0700

Patent

active

052026167

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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