Brushless dc motor without a rotor position sensor

Details Brushless dc motor without a rotor position sensor Brushless dc motor without a rotor position sensor

H - Electricity

02

K

310/119

H02K 29/14 (2006.01) H02P 6/18 (2006.01)

Patent

CA 2035321

A full wave drive brushless DC motor system detects zero- crossing points of counter electromotive forces respectively induced by the stator windings, and then pulse-shapes the thus detected zero-crossing points to obtain a pulse signal train, and then measures the period of the thus obtained pulse signal train to determine a conducting phase of the stator windings in response to the thus counted period. The system is thereby capable of supplying an electric current bidirectionally to each of the stator windings without using a position sensor for detecting a position of a rotor.

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