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Undriven vibrations in brushless DC motors

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2 Author(s)
Hartman, A. ; Quantum, Milpitas, CA, USA ; Lorimer, W.

This paper investigates motor vibrations due to reluctance forces. Forcing frequencies caused by motor design, part geometries, and errors in assembly are tabulated for several popular pole/slot ratios. Motor torque and translational force fluctuations are found to exhibit a rich set of shapes and frequencies, especially when multiple defects occur simultaneously. Two analysis methods are employed: the FEA approach and the convolution method. Both techniques predict similar frequency spectra. The convolution method is faster, easier to implement, and more intuitive, but less accurate

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Magnetics, IEEE Transactions on  (Volume:37 ,  Issue: 2 )