LOAD-LIFTING ELECTROMAGNET CONTROL DEVICE Russian patent published in 1997 - IPC

FIELD: electrical engineering. SUBSTANCE: magnetizing unit has four optoelectronic thyristors, demagnetizing unit using two optoelectronic thyristors between which shunting optoelectronic thyristor is placed. Electromagnet power recorder is built around series-connected diode, voltage divider and optoelectronic transistor. Control unit is represented by pulse-phase control system using the four-channel circuit which has four inputs and four control outputs. First output of system is connected to control inputs of first and third optoelectronic thyristors of magnetizing unit. Second output of pulse-phase control system is connected to second and fourth control inputs of optoelectronic thyristors of magnetizing unit. Third output of pulse-phase control system is connected to control input of shunting optoelectronic thyristor. Fourth output of pulse-phase control system is connected to control inputs of both optoelectronic thyristors of demagnetizing unit. Pulse-phase control system uses AND and OR gates. Device designed to control load-lifting electromagnet allows separation of loads. EFFECT: wider functional capabilities of device. 2 cl, 4 dwg