Abstract: Torque ripple and electromagnetic vibration are two important factors for assessing the quality of driving motors for electric vehicles (EVs). In this paper, a new segmented rotor of interior permanent magnet (IPM) machine for EV was designed and investigated, aiming to mitigate the torque ripple and electromagnetic vibration. The key feature of the presented machine is that the rotor is divided into two segments along the axial direction. The two rotor segments have the same structure and are installed at a mechanical angle of 180 degrees. In each segment, there is a magnetic pole whose pole-arc width is different from that of the others, and the total volume of PMs remains the same. Benefitting from the staggered configuration of the two rotor segments, the unbalanced magnetic pull can be offset. The multi-physics models of the machine were built and the IPM machine with conventional segmented rotor was also modeled for comparative study. The torque ripple, electromagnetic performance, and vibration response were compared. Finally, the machine with the presented rotor and conventional segmented rotor were prototyped, respectively. The extensive experiments including back-EMF, cogging torque, static torque, torque ripple, and efficiency, were compared and evaluated. The results indicate that the presented rotor configuration is superior to the conventional segmented rotor in terms of torque ripple and electromagnetic vibration. The presented rotor configuration can be extended to other types of PM machines, which is of significance in practical engineering.