ASYNCHRONOUS ELECTRIC MOTOR START AND STOP CONTROL DEVICE Russian patent published in 2012 - IPC H02P1/30 H02P3/18 H02P27/06 

FIELD: electricity.

SUBSTANCE: change of rotation speed of asynchronous motor armature consists in change of frequency and voltage supplied to stator windings; at that, voltage on stator is controlled proportionally to frequency. Device includes two pulse generators, alternating voltage rectifier, voltage comparator, voltage integrator, pulse-width modulator and in-series connected binary pulse counter, permanent storage unit, pulse shaper and voltage switching unit intended to connect working voltage to electric motor circuit.

EFFECT: improving the control quality of asynchronous motor rotation speed by providing smooth rise or drop of electric motor armature rotation frequency during acceleration or braking.

3 dwg