Design optimization and performance comparison of two linear motor topologies with PM-less tracks (Invited)

S. Aleksandrov, T.T. Overboom, E. Lomonova

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Linear Permanent Magnet Synchronous Motor (LPMSM) topology is the preferable choice for a linear motor in terms of high force density and good overall performance. However, its main drawback is the relatively high price caused by the extensive usage of rare-earth materials in the track. This factor is critically important, especially when this type of motor has to be used in a long-stroke application, such as storage or airport transportation lines where the main prerequisite is a low-cost, passive and robust track. Therefore, Linear Induction Motor (LIM) and Linear FluxSwitching Permanent Magnet Motor (LFSPMM) are two possible alternatives suitable for long-stroke applications. Considering only the price of the track, LIM topology, with its flat aluminum secondary is most attractive. Nevertheless, the absence of rare-earth materials limits the propulsion force generated by the LIM. Another attractive alternative is the LFSPMM topology, which also has a passive secondary, but it incorporates a limited amount of rare-earth materials in its mover, improving its force generation capabilities. As a relatively new topology, the research on LFSPMM is still limited [1], [2]. The existing design solutions for LIM having relatively small volume, have lower force density [3], compared to the designs having much larger overall dimensions [4]. Therefore, a direct comparison between LIM and LFSPMM is very difficult. Based on the volume of a benchmark LPMSM topology, in this paper, a comparison between LIM and LFSPMM is performed. To obtain optimal designs within this volume, a fast converging, semi-analytical methods are used for modelling both topologies and the results are used to compare LIM and LFSPMM topologies.

Original languageEnglish
Title of host publication2018 IEEE International Magnetics Conference (INTERMAG)
Place of PublicationPiscataway
PublisherInstitute of Electrical and Electronics Engineers
Number of pages2
ISBN (Electronic)978-1-5386-6425-4
ISBN (Print)978-1-5386-6426-1
Publication statusPublished - 24 Oct 2018
Event2018 IEEE International Magnetics Conference (INTERMAG 2018) - Marina Bay Sands Convention Center, Singapore, Singapore, Singapore
Duration: 23 Apr 201827 Apr 2018


Conference2018 IEEE International Magnetics Conference (INTERMAG 2018)
Abbreviated titleINTERMAG 2018
Internet address


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