An induction motor is based on the principle of induction of voltages and currents. Each aircored linear induction motor has a primary winding consisting of a linear array of coaxial circular coils, and a secondary which is a cylindrical conductive sleeve concentric with the primary. Linear induction motors can be manufactured in a wide range of force outputs, speeds, and footprints. Linear motors can mitigate the price differences by removing transmission components. The aim this researc h pro ject is to dev elop a linear induction motor system capable of op erating at 400 v olts with an initial energy of 25 j to in v estigate the lo w feasibilit y op erating concept and erify design pro cedure used in. A lim operates under the same principles as its ac rotary motor counterpart, typically powered by a threephase voltage scheme with a. Linear induction motor limo modular test bed for various. The monorail is powered by a linear induction motor lim. Timeline of the work to be done on the linear induction motor budget. Equivalent circuit of an induction motor enables the performance characteristics which are evaluated for steady state conditions. In this type of motor, the stator and rotor are called primary and secondary respectively. Each primary is installed along the entire length of the launch structure, but is divided into sections.
Free download induction motor seminar ppt, pdf report. The lim operator shall consist of a control unit, one or more linear induction motors and reaction fin sections. Perphase equivalent circuit of a linear induction motor lim. Linear induction motors are quite an engineering marvel, to convert a general motor for a special purpose with more or less similar working principle, thus enhancing its. The stator is laid out in the form of a track of flat coils made from aluminum or copper and is known as the primary of a linear motor. Colorado maglev project comparison of linear synchronous and induction motors fta project ftadc267002. Doublesided linear induction motor dlim the linear motor considered fig. Whether induction or synchronous, single sided or double sided, short stator or long stator, low voltage or high voltage, seis technical expertise covers every type and variant of linear motor. This video has been made regarding our energy conversion laboratory course project single phase linear induction motor in buet. Project design the proposed project was designed with the main goal of having a high degree of modularity.
Aug 12, 2016 this video demonstrates the working model of using linear induction motor in movement of train. Performance of linear induction motors within an automated. Ultimate beginners guide to using electric motors for makers and diy projects part 1. A linear induction motor is a type of linear motor based on a rotary ac induction motor. A slim of specified parameters is designed using a userinteractive matlab program, and then compared to a similar tubular linear induction motor tlim. It has brushes like a dc motor, but will operate on ac or dc.
These two steps also would be an induction motor project for undergraduate students. In an induction motor design, the rotor windings are not accessible from the outside of. In this paper the speed control method of lim, which lead to optimal control characteristic of motor such as thrust, flux and current, is proposed. Alan foster 2 introduction to linear induction motors lims a lim is basically a rotating squirrel cage induction motor opened out flat.
If the induction motor is operating in the linear magnetic region, the lm is constant. In this thesis, the analysis of the dynamic response of a linear induction motor as an electromechanical system is done, accounting for all the governing equations implied in the process which are used to develop the corresponding simulation models. We hope that it will be helpful for anyone working on this project. Theory of linear induction motors 2nd edition nasaads. Pdf a low cost linear induction motor for laboratory experiments. The different concepts of the motor that are in common with other rotating machines, are identified and studied. A linear induction motor provides linear force and motion rather than rotational torque. This project examines the use of linear induction motors lims as the primary propulsion source for the superway automated transit network atn. Induction motor seminar ppt, pdf report study mafia.
Project overview design, construct, and test a linear induction motor lim powered by a threephase voltage input rotate a simulated linear track and cannot exceed 1,200 rpm monitor speed, output power, and input frequency controllable output speed 7 5. Simplified steadystateequivalent circuit of induction motor. Eisuke masada science university of tokyo, nodashi, chiba, japan, 2788510 abstract. Characteristically, linear induction motors have a finite primary or secondary length, which generates endeffects. Study and design of a double sided linear induction motor. Nov 11, 2011 the linear induction motor is designed for high speed operation.
Performance analysis of the linear induction motor for the deepunderground highspeed gtx 202 maximum speed should be around 34. In a linear motor, the stator is unwrapped and laid out flat and the rotor moves past it in a straight line. Linear motors also lack the mechanical advantage that a gearbox or belt transmission can provide a rotary motor. The proposed solution for the normal force issue consists of a linear induction motor lim optimized for urban sml vehicles. In a traditional electric motor, the rotor rotating part spins inside the stator static part in a linear motor, the stator is unwrapped and laid out flat and the rotor moves.
Linear motor powerpoint presentation inductor electric. In order to complete the goal of the study, first, physical dimensions and electrical properties were calculated by using mathcad software and through mathe. Most linear motors are used in the machine construction industry and for production automation purposes. As a result, they often require forced air or watercooling to achieve published specifications.
Then, equation 1 can be shown in terms of magnitude as. For singlesided assemblies, the reaction plate consists of 18in. The monorails at euro disney are powered by lims, as is the vancouver rapid transit system. Lim is an advanced version of rotary induction motor which gives a linear translational motion instead of. Linear induction motors are quite an engineering marvel, to convert a general motor for a special purpose with more or less similar working principle, thus enhancing its versatility of.
Ppt linear induction motor powerpoint presentation. Linear motors are electric induction motors that produce motion in a straight line rather than rotational motion. If a rotary induction motor is compared with the linear induction motor, the lim requires a larger air gap and hence, the magnetising current is greater and the power factor and efficiency of the motor are lower. Linear induction motor a linear induction motor lim is an advanced version of rotary induction motor which gives a linear translational motion instead of the rotational motion. A lim operates under the same principles as its ac rotary motor counterpart, typically powered by a threephase voltage scheme with a force that is produced by a moving magnetic field 1. Pdf this paper explores the construction process of a linear induction motor lim, the basic concepts behind key aspects of linear induction machines.
Project hi, im in engineering sophomore year, i have to build a triphase lim for a project in june yet have no prior experience building any motors or building much at all. High velocity linear induction laucher with exitedge. On the two inductors 2a and 2b, there are located the ring windings in 24 slots, yielding the coils 3. Zimmerman pulsed power sciences center sandia national laboratories, albuquerque, nm 87 185 abstract the seraphim segmented rail phased induction motor concept is a linear induction. Pdf modeling and simulation of linear induction motor by using. Linear induction motors are quite an engineering marvel, to convert a general motor for a special purpose with more or less similar working. An induction motor can be defined as the ac electric motor device in which a power source fed by the alternating current with the help of a primary winding. The purpose of this project is to increase use of lim in industry for transportation purpose. Induction motor runs through direct ac line the amount of power given to it decides to what rpm it does rotates. A linear induction motor lim is a specific type of alternating current ac motor designed to produce motion in a straight line. This book is a report on the results of particular research activities and is not intended as a comprehensive reference work.
We can modulate the power of the ac line to vary the speed of the induction motor through ac driver circuitry. Kaye sandia national laboratories, albuquerque, new mexico, 8718511821 prof. Electric motor electric motor linear induction motors. In the rotary induction motor the stator and the rotor area are same whereas in the lim the one of the two is shorter than the other. Comparison of linear synchronous and induction motors.
Based on the collected data stator current waveform, the state of the fault can be analyzed. Vivek brahmbhatt already has explained very nicely the construction of lim. Design of a single sided linear induction motor slim using a user interactive computer program a thesis presented to the faculty of the graduate school university of missouricolumbia in partial fulfillment of the requirements for the degree master of science by sarveswara prasad bhamidi dr. The linear induction motor test bed has fully interchangeable rotors, application specific rotor. The stator is cut axially and spread out flat in linear induction motor lim. Modeling of linear induction machines for analysis and control. Brazilian sml project, maglevcobra uses for the propulsion a short primary linear induction motor lim with a squirrel cage secondary type. Analytical equations and finite element methods fem are used.
Develop an induction motor model in matlab, then model the interturn fault. Pdf in this paper we present a linear induction motor lim. Generally, it is known as the asynchronous motor because its running speed is less than its synchronous speed. Characteristically, linear induction motors have a finite primary or secondary length, which generates endeffects, whereas a conventional induction motor is arranged. They may be obtained by cutting and unrolling the rotary induction machines to yield flat, singlesided topologies figure 5a, where the cage secondary may be used as such or replaced by. Prototype development model for conveyor using linear induction. Normally lim is used to make a motion frictionless absolutely. Induction motor speed control project serves this purpose of controlling the speed of the induction motor.
The voltage and current is induced in the rotor circuit from the stator circuit for the operation. May 31, 2019 a linear induction motor or lim is a special type of induction motor used to achieve rectilinear motion rather than rotational motion as in the case of conventional motors. The slim equations and design procedures are developed and its performance is predicted using equivalent circuit models. The pulsed linear induction motor university of edinburgh. Based on the secondary part of lims structures, linear induction motor can be classified into two shapes. The linear induction motor is one of the most promising propulsion systems for superhighspeed ground transportation. What is a linear induction motor and how does it work. The result is a flat stator, or upper section, of iron laminations. The linear induction motor is designed for high speed operation. A linear induction motor or lim is a special type of induction motor used to achieve rectilinear motion rather than rotational motion as in the case of conventional motors. The senatorial transit system in washington dc, and many roller coasters and baggage handling systems, are all powered by lims.
Apr 29, 2018 linear induction motor lim is an asynchronous motor, working on the same principle an induction motor works, but is designed to produce the rectilinear motion, unlike the rotary movement produced by a motor. Conversion to mechanical power by motors pumps, fans, hvac, refrigeration compressors. Design of a single sided linear induction motor slim using. The shape and operation of a linear induction motor can be visualized as depicted in the figure by making a radial cut in a rotating induction machine and flattening it out. The application of pulsed, linear induction motor technology for high speed trains is being assessed in a research project at sandia national laboratories. Ive been reading literature until now to understand the principle of the lim, and the objective of my project is to approximate a very. Working, application and construction is this article describes construction, working, applications and various problems associated with lim or linear induction motor written by sunil saharan on sunday, july 11th, 2010 at 01. A linear induction motor lim is an asynchronous motor that works on the same general principle as that of other induction motors, but the structure of it is altered. I would recommend this product to anyone needing it for a diy project. Like permanent magnet linear motors commonly designated as ironless and iron core types linear induction motors consist of a primary part analogous to the stator in a rotary induction motor and a secondary part analogous to the rotor in a rotary version. I would just like to add some practical applications of lim. The pulsed linear induction motor concept for highspeed trains b. Modeling of linear induction machines for analysis and control institution. View linear induction motor research papers on academia.
This is quite an engineering marvel, to convert a general motor for a special purpose with more or. They are capable of speeds up to 1800 insec 45 ms and are typically used in applications where accurate positioning is not required. In a traditional electric motor, the rotor rotating part spins inside the stator static part. Linear induction motor induction launc hers feasible within the scop e of a small undergraduate pro ject. The rotor takes the form of a moving platform known as the secondary. In a conventional round rotor induction motor the behavior of the machine is only needed to be calculated ov er one pole pi tch. This project examines the use of linear induction motors lims as the primary. Pdf on dec 20, 2010, manpreet singh manna and others published modeling and simulation of linear induction motor by using 2d fem find, read and cite.
Linear motors lm enable linear movements at high speeds with great accuracy. This will leave the last three months of the spring semester open for machine optimization, application integration testing and to take care of any emerging task from last semester. Mec design and construction of a pulsed linear induction motor. Linear induction motors are thus less energy efficient than normal rotary motors for any required force output.
Basically a special purpose motor that is in use to achieve rectilinear motion rather than rotational motion as in the case of conventional motors. Pdf construction of three phase linear induction motor. Over the last forty years sei has been involved in numerous diverse projects utilizing linear motors. To study design and winding technique of linear induction motor. One, two, and threedimensional solutions of the field equations have been obtained along with numerical solutions for the electromagnetic field in. Charless linear reluctance motor and nikola teslas invention of the induction motor led to the first linear induction motor lim in 1905 by the german inventor alfred zehden. Performance of linear induction motors within an automated transit. Jul 15, 2019 a linear motor is effectively an ac induction motor that has been cut open and unwrapped. This project is called seraphim, for segmented rail phased induction motor.
Performance analysis of the linear induction motor for the. A linear induction motor lim is an alternating current ac, asynchronous linear motor that works by the same general principles as other induction motors but is typically designed to directly produce motion in a straight line. Current lim applications are considered, and the feasibility and tradeoffs associated with the use of lims vs. Finite element analysis of the forces developed on linear induction. High velocity linear induction launcher with exitedge compensation for testing of aerospace components stephen kuznetsov1 and darin marriott2 1powe rsupe conduc t orappl iaonsc p. It shows how a 3phase ac motor works with a rotating magnetic field and a permanent magnet rotor, making it a synchronous ac motor. The history of linear motors date back as far as the 19th century with the work of charles wheatstone in great britain. The performance of the proposed dtfc method is analyzed with considering endeffect. Introduction linear induction motor lim, is basically an advanced version of motor that is in use to achieve rectilinear motion instead of rotational motion as in ordinary conventional motors.
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