Consideration on Eddy Current Reduction Techniques for Solid Materials Used in Unconventional Magnetic Circuits

Mohammed, Ahmed M.; Galea, Michael; Cox, Tom; Gerada, Chris

Abstract

The use of solid materials in tubular, linear machines has significant manufacturing benefits, as this removes the need for an axially laminated stator. However, this comes at the cost of extra eddy current losses. In this paper, a detailed analysis of the behavior of eddy currents in a tubular permanent magnet machine that comprises unconventional magnetic circuit is given, highlighting the importance of the field distribution and current directions, when compared with conventional magnetic circuits. This analysis is then used to identify and investigate the appropriate eddy current reduction methods for tubular machines, when a solid material stator is being used. Accurate three-dimensional models have been built and then validated on previously built testing setups. Different winding configurations have been accounted. Finally, considerations of these techniques are given when being implemented into an actual, tubular machine design, highlighting the improved performance and losses.

Citation

Mohammed, A. M., Galea, M., Cox, T., & Gerada, C. (2019). Consideration on Eddy Current Reduction Techniques for Solid Materials Used in Unconventional Magnetic Circuits. IEEE Transactions on Industrial Electronics, 66(6), 4870-4879. https://doi.org/10.1109/TIE.2018.2875641

• Journal Article Type: Article
• Acceptance Date: Sep 17, 2018
• Online Publication Date: Oct 17, 2018
• Publication Date: Jun 1, 2019
• Deposit Date: May 16, 2019
• Publicly Available Date: May 16, 2019
• Journal: IEEE Transactions on Industrial Electronics
• Print ISSN: 0278-0046
• Electronic ISSN: 1557-9948
• Publisher: Institute of Electrical and Electronics Engineers
• Peer Reviewed: Peer Reviewed
• Volume: 66
• Issue: 6
• Pages: 4870-4879
• DOI: https://doi.org/10.1109/TIE.2018.2875641
• Keywords: Control and Systems Engineering; Electrical and Electronic Engineering
• Public URL: https://nottingham-repository.worktribe.com/output/1872893
• Publisher URL: https://ieeexplore.ieee.org/document/8495033
• Contract Date: May 16, 2019