磁致冷系統中永久磁場源的磁路設計與分析

室溫磁致冷技術是一新的冷凍方法，它是利用磁性材料本身的磁熱效應（Magneto Caloric Effect,MCE）來達到冷凍的目的。如果使用永久磁鐵來做磁場源，磁場源的強度會因磁鐵材料本身的特性而有所限制，因此應用磁路設計的方法，以提升磁場源的磁感應強度，是一可行的方向。本文將以永久性磁鐵設計為此系統的磁場源，並以數值模擬來分析系統中磁場強度和磁感應強度之分佈狀態，以利設計出更有效率的強力永久磁場源。由本文中得知磁路設計對於磁感應強度的分佈有很大的影響，為了能夠有效的提升磁場源的磁感應強度，因此在磁路設計上，以中空圓柱型來設計磁場源，並分析其磁感應強度。經分析後其磁感應強度超過單一磁體的磁感應強度，在工作區域中磁感應強度可達到2.4T以上。而磁場源所產生的磁漏現象，經過設計分析出改良型的磁場源，對於磁漏現象有明顯的改善，在磁感應強度的提升率可達12.04%。在實驗結果中，單一磁體在組合後，所量測到的磁感應強度可達到單一磁體磁感應強度的2.9倍。

關鍵字

磁致冷；磁路設計；永久磁場源

並列摘要

Room temperature magnetic refrigeration is a new refrigeration method with great application potential. It has advantages such as environment-safe and high efficiency based on the phenomena of magneto caloric effect (MCE). Although mature in low temperature field, magnetic refrigeration is still in the state of exploration in general. The magnetic circuit designs to promotes the intensity. In this paper,magnetic field source is permanent magnet at this system. The value simulates analyzes the system. We can designs the effective permanent magnetic field source. In this paper ,the magnetic circuit design is influential regarding the magnetic field intensity. In order to ,the magnetic field source promotes the magnetic field intensity. The magnetic field source designs by the hollow circular cylinder in magnetic circuit design. After analysis, the magnetic field intensity achieve to 2.4T in working space. The magnetic field source produces the magnetism leaks phenomenon. Improvement magnetic field source is designed. The magnetism leaks phenomenon have obvious improvement. The magnetic field intensity promotion rate can reach 12.04%. In experimental result ,the magnetic field intensity can achieve 2.9 times.