Tubular permanent magnet actuators: cogging forces characterization

J.J.H. Paulides, J.L.G. Janssen, L. Encica, E.A. Lomonova

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Abstract

Tubular permanent magnet actuators are evermore used in demanding industrial and automotive applications. However, these actuators can suffer from large cogging forces, which have a destabilizing effect on the servo control system and compromise position and speed control accuracy. This paper focuses on the identification of the cogging forces by means of finite element software, where an approach is introduced within the 2D finite element analysis to model the linear tubular permanent magnet actuator compared to conventional axisymmetrical models. This gives that the contribution of the stator teeth and finite length of the ferromagnetic armature core to the total cogging force can be separately analyzed. The cogging force predictions is characterized and the effectiveness of the new method is verified comparing the results of the tubular structure in both the axisymmetrical model and 2D finite element model, normally used for rotary machines.
Original languageEnglish
Title of host publicationProceedings of the IEEE EUROCON 2009 Conference, 18-23 May 2009, St. Petersburg
Place of PublicationPiscataway
PublisherInstitute of Electrical and Electronics Engineers
Pages1-7
Publication statusPublished - 2009

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