H - Electricity – 02 – P
Patent
H - Electricity
02
P
310/119
H02P 6/08 (2006.01) H02K 13/14 (2006.01)
Patent
CA 2008475
In a brushless DC motor having a stator coil connected between a source of DC power voltage and circuit common and in which an alternating counter-emf exists, a circuit for converting stored inductive energy in the stator coil into useful motor mechanical energy, the circuit comprising first switch means connected in series between the stator coil and the circuit common for selectively switching current through the stator coil to circuit common during a positive torque producing half-cycle of the alternating counter-emf, thereby maintaining a predetermined average value of the current, and second switch means connected in series with a free-wheeling diode means across the stator coil for re-circulating the current through the stator coil when the first switch means is open and back-emf generated by the coil exceeds the counter-emf by an amount sufficient to forward-bias the diode means, whereby the current re-circulating through the stator coil results in positive torque while the first switch means is open.
Mackelvie John S.
Sim & Mcburney
LandOfFree
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