© 2019 The Institute of Electrical Engineers of Japan. This paper investigates the influence of hysteretic property on motor performance in magnetic field analyses of interior permanent magnet (IPM) motors with concentrated winding or distributed winding. As a result, it is clarified that the influence of hysteretic property as well as eddy current may be large in IPM motors with concentrated winding due to the change of magnetic paths in the core back depending on the degree of magnetic saturation.