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This paper presents an analysis of torque pulsation with respect to the rotor rib shape in an interior permanent magnet motors (IPMs) and the type of magnet materials. The effects of three parameters, the angle and length of the flux barrier and the residual flux density of the PM, are studied using the response surface methodology. Finite element analysis is used to verify that torque ripple reduction affects the optimal rotor rib shape in rare earth and ferrite PMs. In addition, the optimal barrier shapes for each magnet material are identified and compared.