What is slot modulation effect?

Definition

Slot modulation effect, also called sampling effect, is the fact that airgap magnetic stress waves are "sampled" when converted to physical magnetic forces applied to stator teeth. Consequently, due to Shannon theorem, the maximum stress wavenumber seen by the stator is given by Zs/2 (half the number stator slots).

Application to e-NVH

This example illustrates in a 12s10p Permanent Synchronous Machines the sampling effect of the fundamental stress wave (r=2p=10) in an equivalent stress wave of wavenumber r=-2: GIF - 910.3 kb

Application to MANATEE

MANATEE software specialized in the e-NVH simulation of electrical machines and noise reduction of electric motors includes slot modulation effects.

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