On the Design of Single Sided Linear Induction Motor for Urban Transit

Abstract

The urban transit with single-sided linear induction motor (SLIM) propulsion and wheel on rail support and guidance has been developped in Canada and Japan. The maximum speed of the urban transit is about 70km/h and the trains repeat the powering, coasting and braking operation in the relatively short inter station distances. On the design of such SLIMs operated under condition that the load changes every moment, we must take into account the energy consumption as well as the motor weight, input KVA, the performance characteristics. In this paper, we investigate such SLIM design theoretically. The performance characteristics are estimated using space harmonic analysis. The energy consumption is reduced by decreasing the mechanical clearance. Then, the flux density should be low value from 0.5 T to 0.6 T. The motor length of from 2m to 2.5m and the pole pitch of about 300mm are advisable.