Spline-Based Rotor and Stator Optimization of a Permanent Magnet Synchronous Motor

Abstract

This work features the optimization of a Permanent Magnet Synchronous Motor using 2D nonlinear simulations in an Isogeometric Analysis framework. The rotor and stator designs are optimized for both geometric parameters and surface shapes via modifications of control points. The scaling laws for magnetism are employed to allow for axial and radial scaling, enabling a thorough optimization of all critical machine parameters for multiple operating points. The process is carried out in a gradient-based fashion with the objectives of lowering motor material cost, torque ripple and losses. It is shown that the optimization can be efficiently conducted for many optimization variables and all objective values can be reduced.

Figures (4)

• Figure 1: Parametrization of the PMSM geometry including parameter names, material definitions and boundary conditions. The model is originally based on Pahner_1998ab.
• Figure 2: Comparison of initial and optimized geometry. The yellow points show the control points of the motor, the red control points may move during the optimization.
• Figure 3: Comparison of the magnetic flux density.
• Figure 4: Comparison of initial and optimized torque profiles for different operating points.