H - Electricity – 02 – P
Patent
H - Electricity
02
P
318/103
H02P 6/12 (2006.01)
Patent
CA 1228640
CURRENT CONTROL METHOD AND CIRCUIT FOR ELECTRONICALLY-COMMUTATED MOTORS ABSTRACT OF THE DISCLOSURE Techniques for controlling motor winding current by employing ON/OFF duty cycle control switching between an upper and a lower current threshold to establish an average motor winding current approximately midway between the two thresholds. Rising current during ON time intervals is directly measured, and an upper threshold detector is employed to turn OFF a switching transistor when the upper current threshold is reached. Rather than directly measuring decay or fly back current which circulates in the motor windings through free-wheeling diodes for comparison against the lower current threshold, the decay time is simulated. A lower current threshold detector and an upper current threshold detector are employed. Following winding energization, the lower threshold current detector starts a timing device. The upper threshold current detector subsequently stops the timing device, and turns OFF the switching transistor. Winding current then decays, and the decay time needed to reach the lower threshold is simulated by waiting for a decay time interval which is a function of the measured rise time interval.
493271
Company General Electric
Eckersley Raymond A.
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