Validation of Efficiency Maps of an Outer Rotor Surface Mounted Permanent Magnet Machine for Evaluation of Recyclability of Magnets

The goal of this paper is proposing a methodology for the evaluation of the recyclability criterion of permanent magnets (PMs) in electrical machines for Hybrid and Electric Vehicles ((H)EVs). Such methodology was validated with measurements performed to a PM machine of the hub type. In addition, the methodology proposed here is approached in terms of energy consumption. Hence, measurements of torque and speed were taken at various working points. This study comprises the disassembly of one unit in order to determine the main dimensions of the machine for modelling in 2D Finite Element Method (FEM). Additionally, samples of the magnets in the rotor were taken for characterization of their properties. The results of simulations were contrasted with the measurements for the validation of the efficiency maps. Finally, a study case was selected, in which the use of recycled magnet material was simulated and the reduction of efficiency was quantified.