Patent ID: 6310450
Filing Date: 2001-10-30
Classification: G01D,H02P

Abstract:
A method of decoding three logic signals produced by three Hall effect sensors installed in an electronically-switched three-phase brushless motor according to a sequence of six driving phases to be switched synchronously with a rotor position, the method comprising:determining a real phasing of the three Hall effect sensors at 60, 120, 300 or 240 electrical degrees bydecoding a whole set of eight possible combinations of the three logic signals produced by the three Hall effect sensors, anddiscriminating the real phasing of the three Hall effect sensors based upon two dissimilar combinations from among six valid combinations, the six valid combinations from among the eight possible combinations; anddetermining the rotor position based upon the real phasing of the three Hall effect sensors and generating logic driving signals synchronous with the rotor position.