To enhance the performance of the motor and enable a more efficient and stable power output, an electromagnetic design model A for round wire motors and a flat wire motor design model B were established in this study. Particular emphasis was placed on the optimization of the number of winding layers and stator slot dimension parameters in flat wire motors. An optimized flat wire motor model C was then proposed, aimed at reducing AC losses and improving output performance. Through comparative analysis of the three models, it was revealed that the flat wire motor design not only achieves a higher slot fill factor but also delivers superior output performance when subjected to rational electromagnetic design. Simulation analysis indicated that the slot fill factor of flat copper windings was increased by 30.84%, while winding copper loss was suppressed, leading to a 44.57% reduction in total copper loss. The electromagnetic design with flat wire windings enhanced the motor's output performance, yielding a 7.93% increase in average torque, a peak efficiency of 95%, and a 2.06% improvement in efficiency at the rated operating point compared to the round wire motor. Moreover, the proportion of the area with efficiency above 90% was enlarged by 5.98% for the flat wire motor.