Designing the universal vector control system with relay current regulator principle for general purpose industrial AC motor drive control

This paper describes the new energy saving method for AC motor drive control that is based on self-commutated current inverter with a relay regulator of stator current. Designed inverter is based on IGBT-transistors and contains additional cutting diodes and buffer capacitor blocks. The experimental model of control system and its power circuit are built. Simulation results and oscilloscope curves are agreed and show that self-commutated current inverter ensures a near-sinusoidal output voltage curve and a low level of high-order harmonics. Control system of the instantaneous stator current ensures a near-sinusoidal output voltage curve.