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Finite Element Analysis of a Permanent Magnet Machine with Two Contra-rotating Rotors

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Electrical machines with contra-rotating rotors find applications in direct-drive energy conversion systems and in ship propulsion systems that employ hydraulic machinery with two contra-rotating stages. In this article, the operating characteristics of permanent magnet machines with two contra-rotating rotors moving on opposite sides of a common stator core are studied via two-dimensional finite element analysis. Particular attention is devoted to the special flux distortion patterns that arise in contra-rotating machine topologies. The study suggests that the introduction of a screening iron core between the rotors provides for negligible flux distortion levels during contra-rotating synchronous operation of the two rotors.

Keywords: contra-rotating rotors; finite element analysis; permanent magnet machines

Document Type: Research Article


Affiliations: Uppsala University, Engineering Sciences, Uppsala, Sweden

Publication date: December 1, 2009

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