An optimized magnet for magnetic refrigeration

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• 作者：R. Bj&#xf8 ; rk ; C.R.H. Bahl ; A. Smith ; D.V. Christensen ; N. Pryds
• 关键词：Halbach cylinder ; Magnetic field ; Permanent magnet flux source ; Magnetic refrigeration
• 刊名：Journal of Magnetism and Magnetic Materials
• 出版年：2010
• 出版时间：November 2010
• 年：2010
• 卷：322
• 期：21
• 页码：3324-3328
• 全文大小：627 K

文摘

A magnet designed for use in a magnetic refrigeration device is presented. The magnet is designed by applying two general schemes for improving a magnet design to a concentric Halbach cylinder magnet design and dimensioning and segmenting this design in an optimum way followed by the construction of the actual magnet. The final design generates a peak value of 1.24 T, an average flux density of 0.9 T in a volume of 2 L using only 7.3 L of magnet, and has an average low flux density of 0.08 T also in a 2 L volume. The working point of all the permanent magnet blocks in the design is very close to the maximum energy density. The final design is characterized in terms of a performance parameter, and it is shown that it is one of the best performing magnet designs published for magnetic refrigeration.