Patent ID: 6249099
Filing Date: 2001-06-19
Classification: H02P

Abstract:
A method of driving a three-phase motor having first, second, and third coils, comprising:electrically connecting the first coil to a first voltage reference and the second coil to a second voltage reference while leaving the third coil floating during a first driving phase;electrically connecting the first coil to the first voltage reference and the third coil to the second voltage reference while leaving the second coil floating during a second driving phase;electrically connecting the second coil alternately to the first and second voltage references during a first transition phase that immediately follows the first driving phase and immediately precedes the second driving phase;comparing a voltage across a sense resistor during the first transition phase with a third voltage reference, the sense resistor coupling the coils to the second voltage reference; andadaptively adjusting a duration of the first transition phase based on the comparing step.