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Cooling short stroke actuators and linear motors Disclosure Number: IPCOM000022278D
Publication Date: 2004-Mar-04
Document File: 1 page(s) / 20K

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The Prior Art Database



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ID 614397

Cooling short stroke actuators and linear motors

The use of ceramics in actuators to transfer heat to a cooling channnel is generally known. However, this brittle material is hard to handle during assembly and very sensitive for thermal expansion differences. These disadvantages are removed by the application of a grid of metal wires, glued on top of the coils with the wires also glued in the neighbourhood of the cooling channnel. This guarantees an air gap free coupling between cooling channel and the heat source, the coils. New is also to define metal wires (e.g. Aluminium) instead of copper wires, because the weight of copper might be a clear disadvantage for moving actuators.

The advantageous measures are:

­                          good thermal conductivity (apply a metal or ceramics)

­                          not brittle or sensitive for thermal expansion problems (use metal)

­                          prevent eddy currents (use strips or wires of metal)

­                          further reduce eddy currents by giving the strips or wires a layer of insulating material (an additional advantage is that the risk of electrical contact between the coil conductor and the strips or wires is reduced)

­                          prevent that the insulating layer will act as a thermal resistance (preferably apply aluminium with an oxide coating)

­                          conduct the heat in the right direction (direction of the wire from the coil surface towards the cooling channel)

­                          limit the moving mass increase (aluminium)

­                          get a good thermal contact (put the grid on top of the coils and cooling chann...