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The paper reports an improvement method on torque ripples of multi-pole interior permanent magnet synchronous motor (IPMSM) applied to a traction motor for hybrid electric vehicles. In the case of multi-pole IPMSM, the magnetic flux generated by a permanent magnet tends to leak through the bridge of the rotor withouta link with stator windings. The slit design on the rotor surface was proposed to reduce torque rippling and increasethe output power by reducing the leakage flux. Two design parameters for the slit are suggested for optimal designusing the response surface method. As an analysis method, the 2D finite element method (FEM) was applied to consider magnetic saturation effect. Key Words : Interior permanent magnet synchronous motor, Response surface methodology, Torque ripple reduction * Corresponding Author : Ki-Chan Kim(Hanbat National Univ.)Tel: +82-42-821-1090 email: kckim@hanbat.ac.krReceived July 10, 2014 Revised August 4, 2014 Accepted October 10, 2014

Study of the Reduction of Torque Ripples for Multi-pole Interior Permanent Magnet Synchronous Motors using Rotor Saliency