H - Electricity – 02 – P
Patent
H - Electricity
02
P
318/115
H02P 7/28 (2006.01) H02P 3/14 (2006.01) H02P 7/298 (2006.01)
Patent
CA 1037558
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 full-wave rectification and selec- tively operable to supply current of either polarity for motoring in either direction and regenerative operation. An improved gating control system includes a plurality of gating channels each operative for supplying gating pulses to one of the recti- fying elements. Each channel includes three cascaded solid-state switching circuits operating in response to an analog output of a summing circuit receiving a compensated error signal, an alter- nating phase reference-signal, and a constant reference signal for properly controlling the firing angle of the associated con- trolled rectifier. An input switching transistor circuit is connected to receive the analog output of the summing circuit and an output switching Darlington pair circuit selectively operates to operatively connect a storage capacitor to a primary winding of an output transformer having a secondary winding directly connected to the gating and cathode circuits of the controlled rectifier through insulated output leads. An intermediate switching Darlington pair circuit is connected between the input and output switching circuits and provides an output circuit in one channel connected to an input circuit of an output switching circuit in another channel so that the two inter-related channels will both render the associated rectifying devices conductive to energize the D.C. motor. Disable signals relating to the error signal polarity and the relative phase polarity are supplied to the input circuit of the intermediate switching circuit to disable the associated controlled rectifier. - 0 -
224536
Armor Elevator Canada Limited - Armor Ascenseur Canada Limitee
Na
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