Active magnetic bearing for ultra precision flexible electronics production system

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dc.contributor.advisorShore, Paul
dc.contributor.advisorMorantz, Paul
dc.contributor.authorTantau, Mathias
dc.date.accessioned2016-03-08T16:18:05Z
dc.date.available2016-03-08T16:18:05Z
dc.date.issued2015-12
dc.description.abstractRoll-to-roll printing on continuous plastic films could enable the production of flexible electronics at high speed and low cost, but the granularity of feature sizes is limited by the system accuracy. Technologies such as gravure printing and nanoimprint lithography demand a level of rotary motion precision that cannot be achieved with rolling element bearings. Manufacturing tolerances of the rotating parts, thermal drift and process forces in combination with structural compliance add up to additional error motions. In this master by research an active magnetic bearing (AMB) solution is designed for a new, super-sized roll-to-roll flexible electronics production machine, which was so far based on hydrostatic bearings. The magnetic bearing could actively compensate the accumulated synchronous error and maintain high accuracy under all conditions. However, the asynchronous error of a conventional AMB with the required size and power is a problem. In order to reduce the relatively high positioning uncertainty of active magnetic bearings an innovative radial position measurement based on linear, incremental encoders with optical conversion principle is proposed. A commercial encoder scanning head faces a round scale with concentric, coplanar lines on its face. By counting these lines the radial position can be measured. Because such a scale is not readily available, it is made by micro-machining. In experiments, different machining methods are compared. Then a magnetic bearing is built to demonstrate the efficacy of the proposed sensor. As a result, the best measurement noise is 3.5nm at 10kHz and a position uncertainty of approximately 0.25µm has been achieved for the magnetic bearing. These promising results are especially interesting for applications with high precision requirements at low speed of rotation.en_UK
dc.identifier.urihttp://dspace.lib.cranfield.ac.uk/handle/1826/9762
dc.publisherCranfield Universityen_UK
dc.rights© Cranfield University, 2015. All rights reserved. No part of this publication may be reproduced without the written permission of the copyright holder.en_UK
dc.subjectActive magnetic bearingen_UK
dc.subjectAMBen_UK
dc.subjectOptical encoderen_UK
dc.subjectFlexible electronicsen_UK
dc.subjectPlastic electronicsen_UK
dc.subjectRoll-to-roll printingen_UK
dc.subjectR2Ren_UK
dc.subjectPrinting machineen_UK
dc.subjectPrecision sensoren_UK
dc.subjectMagnetic bearing designen_UK
dc.subjectGratingen_UK
dc.subjectMicro-machiningen_UK
dc.subjectSpeedgoaten_UK
dc.subjectImaging scanning principleen_UK
dc.titleActive magnetic bearing for ultra precision flexible electronics production systemen_UK
dc.typeThesis or dissertationen_UK
dc.type.qualificationlevelMasters by Researchen_UK
dc.type.qualificationnameMSc by Researchen_UK

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