A Field Distribution of Dynamic-Link Magnetic Circuit for Room-Temperature Magnetic Refrigeration

A prevalent room-temperature magnetic refrigerator of permanent magnets usually utilize the structure of stationary magnetic circuit. A new notional method of dynamic-link magnetic circuit (DLMC) is proposed in this paper. The DLMC is made up of a changeable magnetic circuit, and it may generate a time-varying magnetic field in a certain space when some parts of the DLMC move. A typical DLMC is introduced in the paper, and a numerical value calculation and an experiment measuring for the DLMC are presented then. The research result shows that such a DLMC may produce a large variation of magnetic field when it is used in a rotary magnetic refrigerator. Although the minimum field is not equal to zero strictly, but it is much smaller than the maximum field, and the time-varying magnetic fields may be used to magnetize and demagnetize the magnetic refrigerants