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Controlling motor noise in a modern steering system


A. Waeber

Master Thesis, FS15 (10437)

A vibroacoustic model of a surface mounted permanent magnet synchronous motor is designed and weak points in the vibroacousic behavior by the motor design and by the motor controller are pointed out. The model for the electromagnetic forces is determined analytically by solving the Maxwell equations using a few simplifications. The results are compared to solving the Maxwell equation with the Finite Element Analysis using FLUX. The vibration behavior of the motor housing, using the assumption of a closed circular cylindrical shell, is developed by using the beam function assumption with the given boundary conditions and the Galerkin method. The radiation efficiency is also determined to evaluate the sound pressure and the sound power around the motor. The analytical solutions of the natural frequencies are compared to a calculation by Finite Element Analysis using ANSYS. Measurement results are recorded on a test bench and are used to validate the model. Finally, the validated model including field oriented control as motor control strategy is run with certain speeds and under different load torques to find the weak points in the vibroacoustic behavior of the motor. Additionally, some ideas are introduced to reduce the disturbing vibrations and noises.

Supervisors: Martin Meyer (ThyssenKrupp Presta AG),


Type of Publication:

(12)Diploma/Master Thesis

R. S. Smith

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% Autogenerated BibTeX entry
@PhdThesis { Xxx:2016:IFA_5389
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