Abstract:Reasonable selection of pole-slot combination is a key part of electric machinery design. In order to solve the problems of time-consuming and resource-consuming caused by repeated modeling with traditional finite element technology, an analytical model of permanent magnet synchronous motor is established to analyze the influence of different pole-slot combination on motor performance. In 2D polar coordinate system, the motor is divided into four regions: armature slot, stator slot opening, air gap and permanent magnet. Then, the Laplace equation or Poisson equation of each sub-domain is constructed. Through the variable separation method combined with the boundary conditions, the sub-domains are analytically calculated, and the construction of the motor’s analytical model is completed. The correctness of the analytical model is verified by the finite element method. The analytical model is used to study the effects of different pole-slot combination on the performance of the motor. The cogging torque of the 60-slot-8-pole motor is much smaller than the others,and the performance of output torque are better. The load radial air gap flux density of fractional pole-slot combination is more sinusoidal than integer pole-slot combination’s, which can effectively reduce torque ripple. Within a certain range, multi-slot structure is beneficial to increase the performance of motor’s output torque.