Development of low AC loss windings for superconducting traction transformer

AC loss in large-scale superconducting cables

The ac losses in superconducting composites have been a subject of study for a long time, but nevertheless several problems remain to be solved, especially with respect to large-scale cables where the geometry of the cable plays an important role. Some of the aspects that will be considered here, are: presence of fields parallel with the conductor, coupling loss in composite conductors having v...

On the Response of Interleaved Transformer Windings to Surge Voltages

Design Process of Traction Motor having Concentrated Non-overlapping Windings

This study deals with the demands of traction motor design process in where not only the application set some design limits but also the control method set its own boundaries. It is a demanding task to design a traction application in where the driving speed varies from low speed up to field weakening area. Permanent Magnet (PM) synchronous reluctance motors are often used in traction applicati...

Eddy Current Losses in Transformer Windings and Circuit Wiring

Skin Effect Figure 1 shows the magnetic field (flux lines) in and around a conductor carrying dc or low frequency current I. The field is radially symmetrical, as shown, only if the return current with its associated field is at a great distance. At low frequency, the energy in the magnetic field is trivial compared to the energy loss in the resistance of the wire. Hence the current Introductio...

Interior permanent magnet motors with non-overlapping concentrated windings or with integral slot windings for traction application

These Interior permanent magnet machines using integral slot windings or non-overlapping concentrated windings are designed for traction applications. Four direct drive traction motors are analyzed: two 25 kW motors and two 100 kW motors at rated speed of 1000 min. Analytical computations are verified by finite element analysis utilizing Cedrat’s Flux2D. Concentrated tooth coil winding machines...