Comparison Study of Interior Permanent Magnet Synchronous Machine with Conventional and Consequent Pole Rotor

This paper compares the electromagnetic performance of the interior permanent magnet synchronous machines (IPMSM) with conventional and consequent pole (CP) rotors, where the 12-slot stator and 10-pole rotor with concentrated windings are employed. Multi-objective optimization is performed in this paper. Both the conventional and CP rotors are optimized by genetic algorithm to achieve the maximum torque/PM volume and minimum torque ripple. Then the electromagnetic characteristics of the two machines, which including back-EMFs, torque characteristic, flux-weakening ability and efficiency are extensively compared. Finally, a conclusion could be reached by FEA that by using the CP rotor model, the machine can offer higher torque and efficiency, lower cogging torque and torque ripple, and better flux-weakening speed expansion performance.