Comparative finite element analysis of two PM fractional slot machines with 9/8 and 9/10 structure
This paper presents a FEM-based analysis of two permanent magnet fractional slot machines that have the same stator structure with 9 slots but a different number of rotor poles, which is 8 and 10 respectively. The results have to point out the advantages and drawbacks of each structure. Specific electromagnetic quantities have been investigated such as flux density and back emf, but also cogging torque and output characteristics under generating and motoring.