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Réduction active du bruit magnétique des machines asynchrones directement connectées au réseau

Abstract : This work allows, on the one hand, to better understand the study of induction machine magnetic noise and, on the other hand, to present a method to reduce it by injecting a small current harmonic.
The first part explains the phenomenon, gives the known mechanical and acoustic relations and compare them to practical experimentations.
The second part presents a method which allows to calculate the flux density harmonics in the airgap; they create Maxwell forces and noise. The determined relations can be used with a cage or a wound rotor and allow to know the stator and rotor current harmonics. They are compared to those given by other authors who neglect many terms.
The numerical applications show the importance of a phenomenon called slotting resonance; it is responsible of important rotor current harmonics and magnetic noise. They show the validity of the theory by comparison with practical readings.
The last part explains the magnetic noise active reduction method. It consists to inject a small current harmonic in order to create a force which must be in opposed to this responsible of the noise. Many implementations are described which permit to inject a supplementary current in a receiver directly connected to the network. The experimentations confirm the validity of the method.
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https://tel.archives-ouvertes.fr/tel-00372876
Contributor : Bertrand Cassoret <>
Submitted on : Thursday, April 2, 2009 - 4:20:03 PM
Last modification on : Thursday, April 2, 2009 - 4:29:04 PM
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  • HAL Id : tel-00372876, version 1

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Bertrand Cassoret. Réduction active du bruit magnétique des machines asynchrones directement connectées au réseau. Autre. Université d'Artois, 1996. Français. ⟨tel-00372876⟩

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