The Stirling cycle is a thermodynamic process which invented by Robert Stirling in 1816 and it has two isothermal processes and two constant volume heat recovery processes. Alexander Carnegie Kirk raised that refrigeration can be realized by reversed Stirling cycle in 1861, then the first Stirling refrigerator has been successfully trial-produced by Philips in 1954. In fact, Stirling refrigerator is a gas mechanical refrigerator which produces cooling capacity through periodic expansion and compression of air in the expansion cylinder. Stirling refrigerator is widely severed to the solid-state electronics device, cryobiology, military and aerospace industries. Thin-wall hot-pressed ring magnet is acted Stirling refrigerator magnet to instead arc magnets in traditional design.
About Stirling Refrigerator Magnet
Linear compressor uses the linear motor to achieve reciprocating linear motion. Most of linear compressors are all electromagnetic vibration compressors which utilize electromagnetic force and mechanical resonance to directly push plunger to do reciprocating vibration. The compressor can be further divided into moving-coil type, moving-iron type and moving-magnet type according to its electromagnetic driving mode. As the current mainstream design, the stator of the moving-magnet type compressor contains inner and outer iron core. The outer iron core is surrounded by ring-shaped excitation coil. The stator is composed of the permanent magnets. The working magnetic field includes alternating magnetic field and the static magnetic field which generated by excitation coil and permanent magnet respectively. The combination of these two magnetic fields will generate axial force and thus push plunger to do reciprocating linear motion. The magnetization direction of Stirling refrigerator magnet should along the radial vector of the ring, therefore, hot-pressed magnet is regarded as a wise solution by many end-users.
