Abstract
This paper studies Single-sided linear induction motor (SLIM) which can be used to motivate in a levitation railway transportation system. The rotary motor is cut out and laid flat to form the equivalent linear induction motor. Linear induction motors (LIM) are used in many different applications, from slow moving sliding doors to high-speed trains around the world. The primary goal is to analyze a small laboratory sized single-sided linear induction motor (SLIM) for educational aid. This research describes the design and construction of the 100 W rating stator component of a SLIM. SLIM consists of stator and rotor. The stator can supply 20 V and 5 A. It is built with iron laminations; having 6 poles and wound with a double layer type. The rotor is coated with aluminum and attached with six permanent magnets. This rotor is located on top of the aluminum track. A SLIM model of specified parameters is designed using a user-interactive MATLAB program. The performance curves of the SLIM i.e., thrust and efficiency, are drawn and then analyzed for target thrust and different rated slips. The effect of parameters of the SLIM such as air-gap, thickness of permanent magnet and the number of poles on the performance of SLIM are analyzed and the results are also discussed.
Highlights
The secondary of the Linear induction motors (LIM), or rotor, which is an permanent magnet, completes the magnetic circuit and creates the magnetic flux linkage across the air gap. This in turn induces a voltage on the conductive wall, which generates an eddy current in the conducting outer layer of the secondary
The performance curves of the sided linear induction motor (SLIM), thrust Fs and efficiency η as a function of rotor velocity Vr, at a rated slip of 5% to 10% and a target thrust of 40 N are as shown in Figure 9 and Figure 10 using the results from Table 2
The theoretical model is focused on the linear induction motor
Summary
A flat or single-sided LIM i.e., a SLIM, is obtained by the imaginary process of “cutting” and “unrolling” a rotary induction motor. Within the slots of the primary stack are laid the poly phase windings to produce the linearly traveling magnetic field, just like the rotating magnetic field in a rotary induction motor, produced by the poly phase stator windings. The secondary of the LIM, or rotor, which is an permanent magnet (or electromagnet), completes the magnetic circuit and creates the magnetic flux linkage across the air gap. This in turn induces a voltage on the conductive wall, which generates an eddy current in the conducting outer layer of the secondary. The interaction between the eddy current and the changing electromagnetic field generates electromagnetic thrust on the plate in the longitudinal direction of the motor [1,2]
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