End-Effect of High-Speed Linear Induction Motor

This paper presents a new theory of the end-effect of a high-speed linear induction motor, an experimental proof of the theory, and several countermeasures to eliminate the end-effect. The theory is developed on the basis of a two-dimensional solution of electrodynamic equations and compared with the experimental results. The experiment has been made by use of a rotary type test facility; the maximum test velocity is 450 km/h. It is found that the theory agrees well with the experiment and that the end-effect exercises a very adverse influence on motor performance. The end-effect is investigated as functions of design parameters by making use of the theory. Some measures to counter the end-effect are proposed and discussed. A parallel-connected linear induction motor is also proposed as a measure to compensate the end-effect, and its performance is studied.