John G. Buchan PhD.pdf - OpenAIR @ RGU - Robert Gordon ...

In a system with a single dielectric, propagation modes degenerate toa single mode with a single velocity of propagation :V= CC-Er.....(5.12)5.2.5 Multi-conductor Coil SectionsA stator coil occupies two distinct regions: the endwinding and the_slot region, where the coil is situated in air and iron respectively.This forms four sections of a multiconductor line.However,one ofthe endwinding sections is interrupted by the coil terminals at orclose to the coil evolute .The coil can therefore be subdivided intoa series of five multi-conductor transmission line sections as shownin the diagram of figure 5.2.5.1.5.2.6 Multi-conductor Junction in a Stator CoilA junction is formed at the interconnection of two multi-conductorline sections and there are five of these junctions in a lossless coilmodel. There are two forms of junction in a stator coil .theslot/endwinding region junction and the terminal junction. Theslot/endwinding junction-ris-a, Junction of two dissimilar N conductorlines of which there are"four in a single coil. This is shown for a7 turn coil in figure 5.2.6.2...., The-, terminal junction comprises thejunction of two similar N conductor lines and two single conductorlines and is shown for a7 turn stator coil in figure 5.2.6.15.3 Scatter Matrix Analysis of a Lossless CoilThe behaviour of a stator coil to a fast risetime pulse, is determinedby the reflections and refractions of the pulse wave at thetransmission line junctions and by interturn coupling .A scattermatrix,for a junction, embodies the relationships between theincident and reflected voltages and currents ), and from it, themagnitudes and polarities of reflected and transmitted waves areobtained .Page 277