This research adopts a synergistic analytical and finite element analysis (FEA) approach to systematically investigate the influence of permanent magnet (PM) segmentation strategies on eddy current losses in high-power-density permanent magnet motors under high-frequency operation. Initially, based on the proposed analytical model for PM eddy current losses, the study thoroughly examines the loss suppression mechanism of conventional segmentation strategies in low-frequency conditions and their failure mechanism in high-frequency scenarios, thereby revealing the distinct characteristics of eddy current loss behavior across different frequency ranges. Subsequently, a three-dimensional electromagnetic field model of the complete machine is established using FEA to analyze the variation patterns of eddy current losses under different PM segmentation schemes, thereby validating the reliability of the analytical model’s predictions. Ultimately, an effective PM segmentation method for suppressing eddy current losses under high-frequency operation is developed.