Description
This key feature of Manatee software allows to identify reliably the main magnetic force harmonics (frequencies and wavenumbers) depending on slot/pole/phase combinations, electrical machine topology (e.g. induction or synchronous machine, inner or outer rotor), and load state using analytic models (instantaneous calculations).
Results are presented as a Campbell diagram of Maxwell harmonics function of speed and frequency. The physical origin of a given force harmonic in terms of permeance, magnetomotive force, flux waves combinations as well as in terms of excitation sources (rotor/stator excitation fields, slotting harmonics, armature winding or magnet space harmonics).
Application
Quick Campbell diagram can be used by electrical engineers in the early design phase for a quick qualitative comparison of Maxwell excitations among different topologies. Once a noise issue has been identified, electromagnetic design engineers can also use this feature to discriminate the harmonic origin of the electromagnetic excitation (e.g. combination of 11p and 13p rotor mmf harmonics with first order slotting harmonic) in order to implement electromagnetic design optimization.
It can also be used by mechanical and acoustic engineers to have a first estimate of the main resonances between magnetic force harmonics and main lamination modes.
Finally, it can be useful for NVH test engineers in order to identify the nature of electromagnetic excitations from experimental spectrograms, and easily discriminate magnetic noise from other noise sources (e.g. mechanical & aerodynamic noise).