Active Reduction of Bearing Forces for Short Stroke Linear Actuators

Description

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 significantly reduce wear and thus improve lifetime and efficiency as well as reduce the size of the mechanical bearings.

Period	13 Aug 2014
Event title	ISMB14, 14th International Symposium on Magnetic Bearings, Linz, Austria, August 11-14, 2014
Event type	Conference
Location	Linz, AustriaShow on map