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A Study on the Characteristic of Concentrated-Winding Induction Motor

Three-phase squirrel-cage induction motors (IMs) are widely used in various applications of electrical machinery, and therefore their cost must be greatly reduced. Cost reduction can be expected when concentrated-winding is applied to an IM. However, the harmonic fluxes in the air gap of a concentrated-winding IM (CW-IM) generally increase. Therefore, the deterioration of the characteristics is inevitable. In addition, sufficient research has not been conducted for CW-IMs. Thus, we have studied how to improve CW-IM to achieve a high performance and reduce cost. This paper reports on the basic characteristics of CW-IM compared with a distributed winding IM, and the effect of the number of rotor slots on CW-IM is demonstrated using finite-element-method.