[COMPUMAG] Study of the combined effects of the air-gap transfer for Maxwell Tensor and the tooth mechanical modulation in electrical machines

AuthorsRaphaël Pile; Yvonnick Le Menach; Jean Le Besnerais; Guillaume Parent;
StatusAccepted: 22nd International Conference on the Computation of Electromagnetic Fields (COMPUMAG19) to be held in Paris, France, July 15-19, 2019
KeywordsMagnetic forces, electric machines, electromagnetics, magnetomechanical effects, vibrations

Abstract

The Maxwell Tensor (MT) method is widely used to compute global forces or local surface forces for vibroacoustic design of electrical machines under electromagnetic excitation. In particular the air-gap Maxwell Tensor method is based on a cylindrical shell in the middle of the air-gap. This communication proposes to quantify the differences between the air-gap MT and the magnetic force wave experienced by the stator. In particular the air-gap to stator transfer and the tooth mechanical modulation effect are studied. A numerical application is performed with a turbo-alternator to illustrate the respective and combined effects of both phenomena. The communication highlights that the tooth mechanical modulation alone is not necessary relevant for electrical machines with a high number of teeth. However the combination of the two phenomena has a clear impact on the calculated surface force wave.

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