Efficiency Evaluation of Induction Motor Using Synthetic Loading Technique

Abstract

This thesis investigates the application of the synthetic loading technique for efficiency evaluation of induction machines. The standard tests require specialist test facilities, additional machines, and for large machines, linear machines, or vertical mounted machine and floor space. Therefore, an efficiency test method that avoids the need for an external mechanical load is desirable. Synthetic loading can determine machine losses and eliminates the need for a mechanical load connected to the test machine. The synthetic loading technique forces the machine under test to accelerate and decelerate using power electronics as power source so the machine alternating between motor-generator actions. If configured correctly the machine, on average over each synthetic loading cycle, operates at rated rms current, rated rms voltage and rated speed, thus producing rated copper loss, iron loss and friction and windage loss. The thesis considers how to properly configure synthetic loading for induction machines. The simulation results show that the synthetic loading technique is capable of evaluating the efficiency of the induction machines.