"Active Reduction of Bearing Forces for Short Stroke Linear Actuators"
: ISMB14, 14th International Symposium on Magnetic Bearings, Linz, Austria, Seite(n) 401-406, 8-2014
Active Reduction of Bearing Forces for Short Stroke Linear Actuators
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ISMB14, 14th International Symposium on Magnetic Bearings, Linz, Austria
Linear magnetic actuators are used in industry for a wide area of applications. In order to reach high values for the axial thrust force, the mover commonly features a permanent magnet excitation. Thus, in combination with a slotted stator layout, these actuators exhibit a high destabilizing stiffness in the direction perpendicular to the direction of motion which has to be compensated by the linear bearings. This paper introduces a linear short stroke actuator with an integrated active bearing force compensation to minimize the forces acting on the mechanical bearings. The potential and limits of a bearing force compensation is analyzed based on a short stroke linear actuators with an E-shaped stator layout. It is outlined how far bearing forces can be compensated even for simple actuator layouts. Especially for linear drives oscillating with a high speed this compensation can signi?cantly reduce wear and thus improve lifetime and ef?ciency as well as reduce the size of the mechanical