Electromagnetic ram actuator

Details Electromagnetic ram actuator Electromagnetic ram actuator

H - Electricity

01

F

310/63, 317/29.6

H01F 7/16 (2006.01) B41J 9/133 (2006.01) B41J 9/38 (2006.01) H01F 7/08 (2006.01)

Patent

CA 1200831

ELECTROMAGNATIC RAM ACTUATOR Abstract An electromagnetic ram actuator, in particular for impact printers, comprises at least one pair of substantially symmetrically designed yoke halves with magnetizable yoke legs, wherein the pole ends of the yoke legs facing each other form aligned operating gaps. A tongue-shaped ram is movable between the operating gaps in a direction coinciding with their line of alignment. The ram comprises armature bars of magnetizable material, each of which is associated with one operating gap. The volume of the armature bars is in each case of the order of the operating gap volume. The armature bars, in the original position of the ram, in the non-excited state of the electromagnet, are positioned external to the operating gaps, being pulled into them upon excitation of the electromagnet. The excitation coil of the electromagnet is slipped on to at least one yoke leg such that a substantial part of its windings extends between two adjacent yoke legs. Inside and/or outside the excitation coil there are several adjacent yoke legs of the same yoke half or adjacent yoke halves. (One such arrangement may be conceived of as being the result of yoke legs having been divided.) At constant external dimensions of the yoke halves, an increase in the force acting on the ram is obtained and a constant force permits reducing the overall height of the ram, respectively.

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