Simplified Analytical Machine Sizing for Surface Mounted Permanent Magnet Machines

Abstract

This paper proposes a simplified analytical machine sizing procedure for a three-phase surface mounted permanent magnet synchronous machines appropriate for both system level analysis and preliminary machine design. For system-level analysis, the proposed method can generate candidate machine models, be used to check if proposed performance values for a machine in a system level design problem are feasible or be integrated into a system-level optimization considering power electronics, passives, and machine. In machine design, the advantage of an analytical process over FEA is its computational efficient nature, capable of quickly generating numerous candidate designs across a wide search-space. Selected designs can be further refined using more computational intensive methods such as FEA, CFD, and machine design software. Outputs of the sizing procedure include, mass, volume, efficiency, slot and rotor geometry, winding dimensions, stator resistance, stator inductance, magnet flux linkage, air gap width, magnet thickness, and steady state thermal results. The sizing procedure is validated using 2D electromagnetic solver FEMM, and machine design software Motor-CAD.