High Speed Ground Transportation. A Preliminary Study of the Linear Induction Motor for High Speed Ground Transportation

摘要

A theoretical study was undertaken to describe the characteristics of a linear induction motor for High Speed Ground Transportation. A quasi-one-dimensional analysis is made of a linear induction motor without recourse to the usual idealization of the polyphase stator windings into current sheets. The analysis assumes that the stator windings and the induced currents inside the reaction rail (rotor) produce a resultant traveling wave magnetic field at the stator surfaces, and under the assumption of negligible end effect, the electromagnetic boundary conditions are applied to determine the attenuation of the magnetic field, both inside the reaction rail and at the air gap between the reaction rail and stator surfaces. Taking into account real machine effects, expressions based on classical AC machine theory are given for the required exciting current, the generated voltage, the net power output, and the electrical efficiency. Results are reduced into equivalent circuit form so comparisons can be made with conventional rotary induction motors. (Author)