|Authors||Raphaël Pile; Yvonnick Le Menach; Jean Le Besnerais; Guillaume Parent;|
|Status||Published in: IEEE Transactions on Magnetics ( Volume: 56, Issue: 1, January 2020 )|
|Keywords||Magnetic forces, electric machines, electromagnetics, magnetomechanical effects, vibrations|
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 paper 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 effects are studied. A new formula is proposed to extend the tooth modulation effect to tangential forces. A numerical application is performed with a turbo-alternator to illustrate the respective and combined effects of both phenomena. The paper highlights that the tooth mechanical modulation is relevant even for electrical machines with a high number of teeth. Additionally the combination of the two phenomena has a clear impact on the calculated surface force. Therefore, it is recommended to take into account the air-gap transfer for any study of the tooth mechanical modulation effect.
The pre-print article can be found here:
The published version can be found on IEEE Xplore.
This study has been performed based on MANATEE software.