The Origin of Permanent Magnet Induced Vibration in Electric Machines

[+] Author and Article Information
B. S. Rahman, D. K. Lieu

Dept. of Mech. Engineering, University of California, Berkeley, Berkeley, CA 94720

J. Vib. Acoust 113(4), 476-481 (Oct 01, 1991) (6 pages) doi:10.1115/1.2930211 History: Received April 01, 1990; Online June 17, 2008


A principal source of vibration in permanent magnet motors and generators is the induced travelling forces from the rotating permanent magnets acting on the stator. The form of the magnetic field and resulting forcing function in the airgap of such machines is critical. The stator is modelled as a solid ring, with no teeth. Various motor parameters were investigated, including the effects of radial versus parallel magnetization, magnetization tolerances, and radial offset. The results were determined with analytical and FEM models. It was concluded that radial magnetization of the permanent magnets was preferable for both vibration and motor performance. Magnetization tolerances and radial offsets yielded a relatively more populated frequency spectrum for the forcing function and thus could lead to a greater probability of resonant modes being excited in the surrounding structure.

Copyright © 1991 by The American Society of Mechanical Engineers
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