H - Electricity – 02 – P
Patent
H - Electricity
02
P
318/84, 318/93
H02P 3/14 (2006.01) H02P 6/08 (2006.01) H02P 6/24 (2006.01)
Patent
CA 1172690
ABSTRACT OF THE DISCLOSURE The specification describes an arrangement for con- trolling the driving and braking current of a brushless D.C. motor which has a permanent magnet rotor and stator windings. The arrangement comprises semi-conductor switching elements applied to an operating voltage source each in series with a respective stator winding. Free-running diodes are associated with the respective stator windings. It also in- cludes a control circuit for the semi-conductor switching elements, a sensor which scans the rotary position of the rotor and controls the semi-conductor switching elements by way of the control circuit in response to the rotary position of the rotor, and comparator means which likewise act on the control circuit and have two inputs. A current measuring apparatus which is in series with the stator windings, measures the stator winding current and the free-running diode current and, by way of the comparator means, cycli- cally releases or blocks the delivery of control signals of the control circuit.
365243
Nielsen Henrik B.
Nygaard Nils H.
Danfoss A/s
Macrae & Co.
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