Electropermanent systems, electro-permanent magnetic system, electropermanent magnetic chucks
Electropermanent systems by HSMAG – Electropermanent clamping systems are the combination of permanent and electromagnetic technology. They exploit the ability of some ferromagnetic materials to become a permanent magnet due to the fast action of strong direct current. In this state, they continue to function without the need of an external power supply. When demagnetizing, impulses create an alternating current which demagnetizes the ferromagnetic materials. An electric current is needed solely for the clamping and unclamping of the workpiece on the chuck.
The advantages of an electro-permanent magnetic system are:
High clamping force which provides the possibility to carry out heavy milling operations.
Greater safety from the point of view of the independence from an electric power supply; even when the supply is off, there is no chance of the workpiece coming free.
Minimal electricity consumption.
Operation from a control unit giving the possibility of automated use.
The on/off state does not influence the temperature in the chuck meaning no risk of deformations of the workpiece caused by fluctuating temperatures and therefore no influence on machining accuracy.
The possibility to produce various chuck dimensions which enables one to solve the requirements of the workpiece size.
The disadvantages of an electro-permanent magnetic system are:
Higher cost than permanent chucks.
In comparison with electromagnets, there is a higher sensitivity to air-gaps between the chuck and the component.
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