DIRECT-CURRENT REVERSING DRIVE Russian patent published in 1995 - IPC

FIELD: electrical engineering. SUBSTANCE: closure of movable contacts of two-pole switch 3 connects plus of power supply to conductor 14 and its minus, to conductor 15. This energizes contactor coil 11 and power supplied through make contact 2 to motor 1 and electromagnetic brake winding 4 thereby setting armature of motor 1 in rotary motion. As soon as actuating element of electric drive approaches extreme position, break contacts of microswitch 9 open and connect plus of power supply to pilot lamp 12. In the process, contactor winding 11 is de-energized, contact 2 opens and disconnects motor 1 from power supply. Motor stops running and brake is applied. For motor reversing, movable contacts of switch 3 are changed over. EFFECT: simplified design due to dispensing with power supply with center tap and due to reduction of quantity of coupling (power) conductors. 1 dwg