DEVICE FOR PROTECTION OF WINDINGS OF ELECTRIC MOTOR AGAINST MOISTURE CONDENSATION Russian patent published in 1994 - IPC

FIELD: electrical engineering. SUBSTANCE: device for protection of windings of electric motor against moisture condensation has power supply source to which electric motor is connected through contacts of magnetic starter, commutator, measurement unit, amplifier, actuating element and diode. Measurement unit is manufactured in the form of resistor and actuating element incorporates relay and thyristor. Anode of thyristor is linked to zero lead-out of motor and its cathode is connected to zero wire of power supply source. Network composed of make contact of relay and resistor coupled to zero lead-out of motor is placed in control circuit of thyristor. Frame of motor is connected to zero wire of power supply source and via diode and resistor to input of feedback amplifier which output is linked to relay. EFFECT: enhanced protection capabilities. 1 dwg