Multiphysics Sizing of Interior Permanent Magnet Machines Based on Geometric Methodology

Abstract

This study presents a sizing methodology in the frame of the multidisciplinary design of interior permanent magnet synchronous machines. The proposed approach targets at obtaining an initial electromagnetic design of the machine, including diameters, axial length, rotor barrier shape, stator slot geometry as well as the winding layout. The analytical design workflow consists of an iterative sizing procedure based on a robust geometric model, consistent equations, and no correction factors. The process is carried out starting from very basic design parameters such as rated voltage, torque, and magnetic material properties. The modular structure of the proposed design algorithm can be easily integrated with optimization routines obtaining a final optimized design, which contemplates various multiobjective constraints.

Keywords

• Air gap flux density
• electromagnetic sizing
• equivalent ring method
• finite element
• interior permanent magnet (IPM) machine
• lumped parameter thermal network