Effect of voltage sag phase factors on the performance of asynchronous motor

Voltage sag has serious impact on the safe and stable operation of induction motor, which has been attracting more and more people's attention. In order to study the influence of voltage sag phase-angle factor on operation performance of asynchronous motor, this paper established the simulation model of asynchronous motor which can simulate different voltage sags. Taking 5.5kW, 55kW and 135kW motor as examples, the influence of phase jump and starting point of voltage sag on stator current peak, torque peak, speed loss and critical clearing time are respectively discussed. The simulation results show that stator current peak and torque peak increase obviously, speed drops apparently and critical clearing time also decreases under the consideration of phase shift, while different starting points have little influence on these operation indicators. Experimental results of a 5.5kW induction motor agree well with those obtained by simulation.