DEVICE FOR CONTROLLING THREE-PHASED ASYNCHRONOUS ELECTRIC MOTOR Russian patent published in 2008 - IPC H02P3/24 H02H7/09 

FIELD: electric engineering.

SUBSTANCE: device for controlling three-phased asynchronous electric motor contains asynchronous motor with stator winding, connected in a star with zero bus, closing contacts of working contactor, opening contacts of braking contactor, rectifier bridge consisting of four diodes, and diode in zero wire. Added to the device for controlling three-phased asynchronous electric motor are three additional capacitors, three resistors, transformer with primary and secondary windings, controllable resistor, three diodes, three auxiliary capacitors, braking contactor with four closing contacts, dynamic braking contactor with three closing contacts and reacting organ. The added elements are coupled in accordance to the formula of the invention.

EFFECT: increased reliability, increased intensity and increased efficiency of braking, ensured disabling of motor in case when one or more phases disappear.

1 dwg