THREE-PHASE ASYNCHRONOUS MOTOR CONTROL DEVICE Russian patent published in 2015 - IPC H02P27/08 H02M7/5395 H02P1/30 

FIELD: electricity.

SUBSTANCE: device intended for control of three-phase electric motor is equipped with voltage-to-frequency converter, five-digit binary divider-counters per 24 states, four biased multivibrators and nine multiplexors. PWM control signal generating by standard digital elements ensures receipt of phase voltage close to sinusoidal voltage at permanent voltage-to-frequency ratio. Conversion frequency is increased for improvement of voltage curve shape.

EFFECT: increased reliability, simplified design, reduced dimensions, weight and costs, reduced labour intensity at adjusting.

2 dwg