Patent ID: 6157150
Filing Date: 2000-12-05
Classification: H02P

Abstract:
A brushless DC motor assembly, comprising:(a) a rotor;(b) a set of stator windings adapted to drive said rotor;(c) a switching power amplifier adapted to apply a voltage to each stator winding in sequence according to a received sequence of switching signals;(d) a terminal adapted to receive a commanded rotor position;(e) a current sensing assembly permitting the determination of a sequence of stator coil current values over time for each stator coil; and(f) a data processing assembly configured to calculate said sequence of switching signals and a computed rotor position, said switching signals calculated based on a comparison of said computed rotor position and a said received commanded rotor position and said computed rotor position calculated based on said sequence of stator coil current values and said computed switching signals.