Motor Stator Modeling and Equivalent Material Parameters Identification for Electromagnetic Noise Calculation

Aiming at the laborious process in motor structure modeling for acoustic noise calculation, an improved stator structure modeling scheme is proposed, which includes stator structure simplification and equivalent material parameters identification. The stator assembly is modeled as a homogeneous solid with the same size as the stator core, and the influence of model simplification is compensated by orthotropic equivalent material parameters. The equivalent material parameters are acquired through an optimization algorithm by minimizing the error between FEM calculated modal frequencies and the modal tested results. With the stator assembly model, the motor assembly model is built, and the constrained modal characteristics of the motor assembly are verified by comparing the modal frequencies to the resonance bands in the vibration acceleration spectrum. Finally, the motor structure model is used to calculate the electromagnetic noise of an induction motor. As the calculated result matches well with the tested data, the applicability of the proposed motor structure modeling scheme for electromagnetic noise calculation is validated. The proposed method can greatly reduce the workload in motor structure modeling without sacrificing the accuracy and applicability of the model.