H - Electricity – 02 – P
Patent
H - Electricity
02
P
318/103
H02P 7/28 (2006.01)
Patent
CA 1057815
D.C. MOTOR CONTROL HAVING GATING CONTROL OF A FULL-WAVE RECTIFIER SYSTEM ABSTRACT OF THE DISCLOSURE A D.C. motor is selectively connected to receive ener- gizing power from a polyphase power source through a dual bridge rectifying system providing six pulses per cycle of the poly- phase power supply by full-wave rectification and selectively operable to supply current of either polarity for motoring or regenerative mode of operation in either direction and capable of operating a transportation system such as an elevator, for example. An improved gating control system includes a plurality of gating channels each supplying gating pulses to one of the rectifying elements. Each channel includes three cascaded solid-state switch- ing circuits operating in response to an analog output of a summing circuit receiving a compensated error signal, an alternating phase reference signal, and a constant reference signal for prop- erly controlling the firing angle of the associated controlled rectifier. The output cascaded switching circuit of each channel selectively and operatively connects a storage capacitor to an output transformer having a primary winding interconnected with a filter eliminating high frequency signals and a secondary winding shunted by a resistor and directly connected to the associated controlled rectifier The intermediate cascaded switching circuit of each channel provides an output circuit connected through a uni- directional conducting first circuit to control the output cascaded switching circuit of the same channel and further connected through a unidirectional conducting second circuit to an output switching circuit in another channel so that the two interrelated channels will both render the associated rectifying devices conductive to energize the D.C. motor. Two back to back series connected selenium rectifiers operating as an A.C. device are connected across the dual bridge output and clip undesirable transient peaks of a pre- determined magnitude substantially greater than the rating of the individual rectifier devices. -0-
238612
Armor Elevator Canada Limited - Armor Ascenseur Canada Limitee
Na
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