Several aspects of linear induction devices have been analysed and measured, mainly with regard to their application in tracked ground transport. A linear induction machine (the magnetic river) which can provide lift, lateral guidance and thrust forces in transport schemes has been extensively tested at standstill. The results are compared with calculated predictions obtained by finite element and Fourier harmonic techniques. High lift and thrust forces were found to be incompatible characteristics of such machines. This, coupled with the need for separate control of the three-axis forces, indicates that these forces are best provided by different machines on the same vehicle. The damping of vertical disturbances (heave) at speed in inductively levitated vehicles is theoretically investigated using the above mathematical techniques, very little damping being found. The flux density level in the track backing iron associated with an axial flux linear induction machine at speed is calculated. This quantity is of considerable economic importance as it determines the optimum track iron thickness. A new contactless device for measuring linear velocities, a linear tachometer, is analysed and tested.
| Identifer | oai:union.ndltd.org:bl.uk/oai:ethos.bl.uk:470813 |
| Date | January 1979 |
| Creators | Rodger, David |
| Publisher | University of Aberdeen |
| Source Sets | Ethos UK |
| Detected Language | English |
| Type | Electronic Thesis or Dissertation |
| Source | http://digitool.abdn.ac.uk/R?func=search-advanced-go&find_code1=WSN&request1=AAIU447215 |
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