PMASynRM late design-stage rotor shape NVH optimization

Electrical machine electromagnetic-caused noise and vibration represents an ever-increasing target for machine-designers. A novel late design-stage NVH optimization method using the full rotational velocity synthesized vibration-response map is proposed. This is assisted by a target-setting method for the most important force harmonics using a force sensitivity analysis. The procedure is applied on a PMASynRM used for light traction applications, where the rotor cross-section is modified by introducing notches and saliency. The results for different percentages of permitted decrease in average show that both resonances and individual frequency orders can be directly targeted and minimized.