The linear induction motor (LIM) & single linear induction motor (SLIM)

摘要

First of all mentions linear induction machines in 1890, only two years after the discovery of the rotary induction principle. Basically the concept of the linear device consists in imagining a rotary machine to be cut along a radial plane and 'unrolled' so that the primary member then consists of a single row of coils in slots in a laminated steel core. The differences between rotary and linear motors are outlined and reasons for the slow application of linear motors are explained. Principal developments in linear machines since the 1950s are described. Induction motor which can be used to power capsules in an xv capsules in a pneumatic capsule pipeline system. Several optimal design schemes of a single sided linear induction motor (SLIM) adopted in linear metro are presented in this paper Firstly the equivalent circuit of SLIM fully considering the end effects, half-filled slots, back iron saturation and skin effect is proposed ,based on one dimensional air gap magnetic equations In the circuit, several coefficients including longitudinal end effect coefficients Kr(s) and Kx(s), transversal end edge effect coefficients Cr(s) and Cx (s), and skin effect coefficient K fare achieved by using the dummy electric potential method and complex power equivalence between primary and secondary sides Furthermore, several optimal design restraint equations of SLIM are provided in order to improve the operational efficiency and reduce the primary weight. The result tries to establish a new concept for elevators through a new construction technique and assembly of the system with counterweight, which increases the reliability and comfort with cost reduction.