Comparison Of Modular Spoke-Type Permanent-Magnet Machines Using Different Magnets For In-Wheel Traction Applica-Tions

The main purposes of this paper consist of two parts: First, topologies of novel modular spoke-type permanent-magnet (MSTPM) machines with two different magnetization modes are introduced, and corresponding analytical modes are built as well. Second, two types of magnet, including bonded and sintered neodymium-iron-boron (NdFeB) magnets, are applied in MSTPM machines with different magnetization modes. Based on analytical model and finite element (FE) method, the comparison between MSTPM machines using different magnets is conducted, with respect to field harmonic, back electromotive force (EMF), electromagnetic torque, and over-load capability. A prototype machine is assembled and tested to verify predictions.