Abstract
Traditional contact seal is usually used in rotating parts of ocean energy converters. It is hard to avoid leakage, and with the increase of working time, the leakage becomes serious, which will make ocean energy converters fail to work. In the paper, a new type isolation transmission mechanism, which is permanent magnetic coupling, replaces the traditional contact seal and achieves absolute seal of the rotating parts and longtime operation of ocean energy converters. This paper introduces permanent magnetic coupling into ocean energy converters and uses the equivalent magnetic charge theory to analyze the influence of magnet pole-pairs number on the transmitted torque of permanent magnetic coupling. The relationship between permanent magnetic coupling transmitted torque and magnet pole-pairs number is obtained. The paper is conducive to the promotion of using permanent magnetic coupling in ocean energy converters.
Highlights
With the increasingly serious global energy crisis, renewable energy has been gaining more and more attention, which is high-quality, clean, non-polluting and abundant
Planar permanent magnetic coupling consists of two opposing rotors and magnets are distributed on the surface of the rotors
Planar permanent magnetic coupling is usually used in small power transmission occasions
Summary
With the increasingly serious global energy crisis, renewable energy has been gaining more and more attention, which is high-quality, clean, non-polluting and abundant. Power generation efficiency and reliability are improved greatly with the rapid development of ocean energy converters in the past 30 years. Energy conversion usually involves power transfer and the converters need to be isolated from the ocean water. To solve those problems, the permanent magnetic coupling with isolation cover is used to improve the transmission mechanism of the converters [11, 12]. The isolation cover can seal completely and ensure the reliability and survivability of the converters
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