M. Tech. Digital Technology. / This dissertation reports on an optical-based two-dimensional position sensor for use in
Active Magnetic Bearings (AMB) to measure the position of the levitated rotor. The
motivation for the deployment of optical technology is the well-known advantage of high
precision contactless displacement measurement. The radial and axial edges of the rotor are
illuminated by red and green laser beams respectively. The position of the rotor is
determined from its image projected on a Charge Coupled Device (CCD) sensor. The
measuring principle is demonstrated as a position sampler in the closed loop control of an
active magnetic bearing model.
The image representing the position is processed with a real-time algorithm on a Field
Programmable Logic Gate Array. The principle of operation of a CCD as a position sensor
is analysed in order to establish how the image captured by the CCD can be processed to
determine the position of the rotor. A simple AMB is modelled in which the sensor acts as
a feedback position device. The main objective of the model is to evaluate the accuracy of
the system. The purpose of the overall sensing technique to be used is to achieve highly
accurate and precise measurements with CCD-based optical metrology.
| Identifer | oai:union.ndltd.org:netd.ac.za/oai:union.ndltd.org:tut/oai:encore.tut.ac.za:d1001047 |
| Date | January 2007 |
| Creators | Sithole, Phila Elvis |
| Source Sets | South African National ETD Portal |
| Language | English |
| Detected Language | English |
| Type | Text |
| Format | |
| Rights | © 2007 Tshwane University of Technology |
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