RESEARCH ON EVALUATING THE PERFORMANCE OF SPEED CONTROL OF SINGLE-PHASE ASYNCHRONOUS MOTOR IN VARIOUS WIDE-PULSE MODULATION MODES

Abstract

The article analyzes, evaluates, compares the performance of single-phase asynchronous motor speed control in various modulation modes with improved pulse width modulation (PWM) mode and classic SinPWM mode, as well as with the case of supplying standard sine wave. The proposed improvement rules are based on changing the distribution rules of motor states and braking states. The results are examined, analyzed, compared, and evaluated using a simulation model in Matlab-Simulink software. The performance of single-phase asynchronous motor speed control is evaluated by indicators such as mechanical characteristic stiffness, motor loading capacity, static speed oscillation based on comparison when controlling the speed of single-phase asynchronous motor according to the frequency-voltage control law with constant load case. The comparison results have shown that the output alternating voltage form of inverse H bridge with sequential improved switching law and SincosPWM provide better performance for the operation of single-phase asynchronous motor compared to the inverse H bridge voltage in classic SinPWM mode. In particular, the speed control performance in SincosPWM mode is nearly equivalent to supplying standard sine wave to the motor. This has practical significance in designing power conversion circuits for AC drive systems to save energy and reduce the impact of high-order harmonic waves.