ELECTROMAGNET INCORPORATING FIELD-FORCING PROVISION Russian patent published in 2002 - IPC

FIELD: electrical engineering; automatic-control systems for oil production, power, and other industries. SUBSTANCE: electromagnet used for forced energizing of actuating electromagnetic devices such as actuators of electromagnetic valves has two input terminals for connecting ac supply mains, electromagnet coil, first and second capacitors, first and second rectifiers, voltage regulator diode, first resistor, and optoelectronic ac switch; first and second rectifiers are connected to output leads through first and second capacitors, respectively; output leads of optoelectronic switch are connected in parallel with second capacitor; voltage regulator diode is connected to output leads of first rectifier and its anode is connected through first resistor to first input of optoelectronic switch; novelty is introduction of second resistor and third capacitor and using full-wave circuit arrangement for first and second rectifiers and bidirectional thyristors for optoelectronic ac switch; second input of the latter is connected to second resistor and to third capacitor; cathode of voltage regulator diode and second lead of first power supply are connected to second resistor and to third capacitor; outputs of second rectifier are connected to electromagnet coil leads. EFFECT: enhanced operating efficiency of electromagnet; ability of forcing-pulse length control. 1 dwg