Estimation of the Harmonic Loss of a Capacitor Motor on Load Using an Evaluation Index Ew2

Reduction of the iron loss and copper loss of induction motors has been thoroughly studied in a conventional sense. However, the fact that no method for estimating the harmonic loss due to the materials or dimensions of a motor has yet been established, has been an obstacle to harmonic loss reduction. We proposed an evaluation index Ew2 for the harmonic loss that is caused by slots of a capacitor motor, which is a kind of a single-phase induction motor. Ew2 is calculated from effective value of electromotive force with a virtual coil of the rotor surface. On no load, we found that Ew2 was effective as an evaluation index for the harmonic loss. In this paper, we calculate Ew2 on load and examine the propriety of using Ew2 as a harmonic loss evaluation index.