DEVICE FOR REGULATING ELECTRIC MOTOR Russian patent published in 1994 - IPC

FIELD: electric drives. SUBSTANCE: when contact 2 of control switch is made, coil 1 of magnetic starter, shunted across movable 7 and motionless 8 contacts of button 8 by diode 3, is connected to power supply through capacitor 4. In starting mode movable contact of button 6, being connected with output of coil 1, capacitor 4 and with anode of triac 10, breaks shunting circuit of diode 3 and applies potential to control electrode of triac 10 through the other motionless contact 9 of button 6. Triac 10, being opened, shunts capacitor 4 and connects coil 1 to complete voltage of power supply. After starter operated and button 6 returned into initial position, coil 1 is shunted by diode 3 and connected to power supply through capacitor 4. EFFECT: improved efficiency of control. 2 dwg