2. Characterization of magnetic forces
2.1 Resonance principle
We first assume that Maxwell's forces do not vary along the machine axis, and can therefore only excite bending modes in the stator plate/frame structure, which can be likened to an orthotropic cylindrical shell . Rolling and pressing of the laminations tend to give rise only to purely radial modes
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Characterization of magnetic forces
Prediction of audible magnetic noise
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