Eriksen, Dan1; Bahl, Christian R.H.1; Smith, Anders1; Pryds, Nini1
1 Department of Energy Conversion and Storage, Technical University of Denmark2 Electrofunctional materials, Department of Energy Conversion and Storage, Technical University of Denmark3 Secretariat, IT, Department of Energy Conversion and Storage, Technical University of Denmark
The magnetic force between a permanent magnet and different blocks of ferromagnetic materials was measured and calculated as a function of distance and temperature in the vicinity of the Curie temperature of the materials. The calculations were carried out using a 3-D finite-element model of the system. On the basis of forces predicted by the model a number of equilibrium points were calculated for a system where the magnetic force on a ferromagnetic block of material is balanced by a linear spring force. It is shown how these calculation procedures can be used as a tool for designing autonomous temperature dependent and temperature adjustable actuation systems. A shunt valve utilizing such a system was designed, built and tested.
I E E E Transactions on Magnetics, 2013, Vol 49, Issue 3, p. 1159-1162
Magnetic forces; Magnetic materials; Permanent magnet (PM) machines