Stray Loss Formulation for Inverter-Driven Induction Motors for a Wide Range of Switching Frequency and Motor's Loading

In this article, we present a fast and accurate empirical stray loss model for inverter-fed three-phase induction motors (IMs). The objective of the model's development is to estimate the stray loss in an IM during its design stage and during the regular operation. With the breakthrough in power electronics, the use of inverter-fed motor-driven systems has become convenient and these systems are now widely deployed in a variety of applications. The development of the proposed model, hence, considers the variations of frequency, switching frequency, and motor's loading to account for the impact of inverter power supply. The phenomenological relationship of stray loss with motor's equivalent circuit and power supply parameters is developed, and the stray loss is profiled using these parameters as prime variables. The test data of 128 operating points of two training IMs are used to develop the model. The accuracy and prediction capability of the proposed model are presented with the measured stray loss values for 294 operating points of another set of IMs comprising total six motors.