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Non-contact linear slider for cryogenic environment

Non-contact linear slider for cryogenic environment,10.1016/j.mechmachtheory.2011.09.002,Mechanism and Machine Theory,José-Luis Pérez-Díaz,Juan Carlos

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Non-contact linear slider for cryogenic environment  
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A non-contact linear slider based on stable superconducting magnetic levitation with a long permanent magnet as a slider and two fixed superconducting disks which define the slide way has been designed, built and tested. The slider can be moved stably along a stroke of ±11.5mm by supplying a low current in a coil located at the end of the stroke while the levitation remains stable providing a reliable mechanism for linear displacement in a cryogenic environment. The response is linear with a sensitivity of 52±2μm/mA for displacements lower than 6mm. Run out, pitch, yaw and roll have been measured demonstrating an overall good performance. In all cases the measured hysteresis was lower than 250μm and the measured run out was also lower than 250μm both for Y and Z axis.Roll and yaw were always below 300μrad, that is one order of magnitude lower than the pitch (4500μrad).
Journal: Mechanism and Machine Theory - MECH MACH THEOR
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