Comprehensive Analysis of Pole/Slot Combination on Performance for Wheel-hub Propulsion

Fractional slot concentrated winding machine is a promising solution for wheel-hub propulsion. However, there are so many pole/slot combinations for such machine especially when with larger number of poles. Such combinations usually have similar electromagnetic performance, thus it is difficult to select the most rational and optimal combinations from numerous candidates. This paper takes a 50kW high torque density wheel-hub motor as an example to make a comprehensive comparison of different pole-slot combinations. The common pole-slot combinations are screened by inherent performance and design specifications. Performance comparisons are then carried out to determine the appropriate combination for the prototype. Finally, prototypes are manufactured to verify the analysis results.