Browse Publications Technical Papers 2019-01-1461
2019-06-05

Multiphysics Multi-Objective Optimization for Electric Motor NVH 2019-01-1461

Prediction of noise/vibration at the design stage is important for motor design. However, due to the multiphysics nature of the noise, vibration, harshness (NVH) simulation, an integrated workflow is required for wide adoption across industries [1-5]. ANSYS Workbench provides a platform where electromagnetic, structural and acoustic solvers can communicate with each other without user interventions. Based on the platform, multiple design points can be created with statistical sampling on given design spaces and solved by distributed high performance computers. Response surfaces can then be created with the solution from the design points and used for multi-objective optimization. To demonstrate the optimization workflow, multiple parameters for a motor design similar to the Prius motor are created. Four geometrical variables are selected for optimizing the electromagnetic and acoustic performance of the motor, including the width of slot opening (Slot_Open), the height of the slot opening (Slot_Open_Height), Q-axis flux path width on the rotor (Qaxis_Width), and the thickness of rotor magnetic bridge near the airgap (Flux_Bridge). Equivalent radiated sound power level (ERPL) and torque are calculated. Sensitivity study based on 29 design points provides insight for the motor NVH design. Optimized design to minimize ERPL while maintaining the torque output are calculated based on the automatic workflow. [1] Senousy, M., Larsen, P., and Ding, P., "Electromagnetics, Structural Harmonics and Acoustics Coupled Simulation on the Stator of an Electric Motor," SAE Int. J. Passeng. Cars - Mech. Syst. 7(2):2014, doi:10.4271/2014-01-0933. [2] Senousy, M., Larsen, P., and Ding, P., "Electromagnetics Structural Coupling Simulation of Electric Motor", NAFEMS European Conference on Multiphysics Simulation, Oct. 2014. [3] Tong, W., 2014. Mechanical design of electric motors. CRC press. [4] Gieras, J.F., Wang, C. and Lai, J.C., 2005. Noise of polyphase electric motors. CRC press. [5] Rosu, M., Zhou, P., Lin, D., Ionel, D.M., Popescu, M., Blaabjerg, F., Rallabandi, V. and Staton, D., 2017. Multiphysics Simulation by Design for Electrical Machines, Power Electronics and Drives (Vol. 66). John Wiley & Sons.

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