Interaction of winding topologies and rotor structure in interior permanent magnet machines

In this paper the interaction between rotors with interior permanent magnets (IPM) and different winding topologies is analyzed. A distinction is made between distributed winding and fractional slot winding. Four designs with different winding topology will be analyzed concerning their reluctance. It can be shown that not only the geometry of the stator and rotor affect the reluctance torque. The winding topology, respectively the current load spectrum is of significant relevance. It can be inferred that not every winding topology can be used effectively with IPM rotors. Certain orders in the harmonic spectrum of the winding reduce the reluctance torque. By using a current load model to exclude stator geometry effects that impact the reluctance, it can be shown that a higher reluctance torque can be achieved through the suppression of certain harmonics.