This video has been made regarding our energy conversion laboratory course project single phase linear induction motor in buet. We hope that it will be helpful for anyone working on this project. Performance analysis of the linear induction motor for the. Linear induction motors are thus less energy efficient than normal rotary motors for any required force output.
Timeline of the work to be done on the linear induction motor budget. 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. 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. This project is called seraphim, for segmented rail phased induction motor. Over the last forty years sei has been involved in numerous diverse projects utilizing linear motors. In order to complete the goal of the study, first, physical dimensions and electrical properties were calculated by using mathcad software and through mathe. The senatorial transit system in washington dc, and many roller coasters and baggage handling systems, are all powered by lims. In a linear motor, the stator is unwrapped and laid out flat and the rotor moves past it in a straight line. An induction motor is based on the principle of induction of voltages and currents. 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. Pdf a low cost linear induction motor for laboratory experiments. The slim equations and design procedures are developed and its performance is predicted using equivalent circuit models.
Induction motor seminar ppt, pdf report study mafia. Ultimate beginners guide to using electric motors for makers and diy projects part 1. Performance of linear induction motors within an automated. To study design and winding technique of linear 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. For singlesided assemblies, the reaction plate consists of 18in. Linear induction motors are quite an engineering marvel, to convert a general motor for a special purpose with more or less similar working. Pdf in this paper we present a linear induction motor lim. Aug 12, 2016 this video demonstrates the working model of using linear induction motor in movement of train. Jul 15, 2019 a linear motor is effectively an ac induction motor that has been cut open and unwrapped. The rotor takes the form of a moving platform known as the secondary. Develop an induction motor model in matlab, then model the interturn fault. The purpose of this project is to increase use of lim in industry for transportation purpose.
As a result, they often require forced air or watercooling to achieve published specifications. Perphase equivalent circuit of a linear induction motor lim. The lim operator shall consist of a control unit, one or more linear induction motors and reaction fin sections. I would recommend this product to anyone needing it for a diy project. 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. The different concepts of the motor that are in common with other rotating machines, are identified and studied.
Characteristically, linear induction motors have a finite primary or secondary length, which generates endeffects. Linear induction motors can be manufactured in a wide range of force outputs, speeds, and footprints. Each primary is installed along the entire length of the launch structure, but is divided into sections. 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. The voltage and current is induced in the rotor circuit from the stator circuit for the operation. Colorado maglev project comparison of linear synchronous and induction motors fta project ftadc267002. Modeling of linear induction machines for analysis and control. High velocity linear induction laucher with exitedge. Design and fabrication of linear induction motor for traction. Linear induction motors are less efficient than permanent magnet linear motors, and thus produce more heat for a given continuous force output.
The proposed solution for the normal force issue consists of a linear induction motor lim optimized for urban sml vehicles. Design of a single sided linear induction motor slim using. 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. Finite element analysis of the forces developed on linear induction. 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. It has brushes like a dc motor, but will operate on ac or dc. Prototype development model for conveyor using linear induction. A lim operates under the same principles as its ac rotary motor counterpart, typically powered by a threephase voltage scheme with a. Usdot pueblo, co high speed test track and reported. Linear motors lm enable linear movements at high speeds with great accuracy. Current lim applications are considered, and the feasibility and tradeoffs associated with the use of lims vs. Based on the collected data stator current waveform, the state of the fault can be analyzed.
Lim is an advanced version of rotary induction motor which gives a linear translational motion instead of. Study and design of a double sided linear induction motor. 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. 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. 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. Vivek brahmbhatt already has explained very nicely the construction of lim. The linear induction motor is one of the most promising propulsion systems for superhighspeed ground transportation. Kaye sandia national laboratories, albuquerque, new mexico, 8718511821 prof. Energy loss reduction in induction motor using combined statdelta winding. Modeling of linear induction machines for analysis and control institution.
Linear induction motor limo modular test bed for various. Induction motor speed control project serves this purpose of controlling the speed of the induction motor. In an induction motor design, the rotor windings are not accessible from the outside of. Simplified steadystateequivalent circuit of induction motor. 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. 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. Pdf construction of three phase linear induction motor. Nov 11, 2011 the linear induction motor is designed for high speed operation. 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. A linear induction motor lim is a specific type of alternating current ac motor designed to produce motion in a straight line. 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.
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. 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. Free download induction motor seminar ppt, pdf report. Linear induction motor induction launc hers feasible within the scop e of a small undergraduate pro ject. We can modulate the power of the ac line to vary the speed of the induction motor through ac driver circuitry. Pdf this paper explores the construction process of a linear induction motor lim, the basic concepts behind key aspects of linear induction machines. However, there are end effects that reduce the motors thrust force. Conversion to mechanical power by motors pumps, fans, hvac, refrigeration compressors. Brazilian sml project, maglevcobra uses for the propulsion a short primary linear induction motor lim with a squirrel cage secondary type. One, two, and threedimensional solutions of the field equations have been obtained along with numerical solutions for the electromagnetic field in. The application of pulsed, linear induction motor technology for high speed trains is being assessed in a research project at sandia national laboratories. 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.
Doublesided linear induction motor dlim the linear motor considered fig. 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. These two steps also would be an induction motor project for undergraduate students. Linear motors are electric induction motors that produce motion in a straight line rather than rotational motion. The stator is cut axially and spread out flat in linear induction motor lim. I would just like to add some practical applications of lim. On the two inductors 2a and 2b, there are located the ring windings in 24 slots, yielding the coils 3. They are capable of speeds up to 1800 insec 45 ms and are typically used in applications where accurate positioning is not required. What is a linear induction motor and how does it work. Basically a special purpose motor that is in use to achieve rectilinear motion rather than rotational motion as in the case of conventional motors. It shows how a 3phase ac motor works with a rotating magnetic field and a permanent magnet rotor, making it a synchronous ac motor. Mec design and construction of a pulsed linear induction motor. 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. 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.
A linear induction motor provides linear force and motion rather than rotational torque. In a traditional electric motor, the rotor rotating part spins inside the stator static part. In this leaflet the following information can be found. The linear induction motor is designed for high speed operation.
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. 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. If the induction motor is operating in the linear magnetic region, the lm is constant. This book is a report on the results of particular research activities and is not intended as a comprehensive reference work. 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. Most linear motors are used in the machine construction industry and for production automation purposes. Theory of linear induction motors 2nd edition nasaads.
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. 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. Normally lim is used to make a motion frictionless absolutely. Eisuke masada science university of tokyo, nodashi, chiba, japan, 2788510 abstract. The pulsed linear induction motor concept for highspeed trains b. 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. The monorail is powered by a linear induction motor lim. The monorails at euro disney are powered by lims, as is the vancouver rapid transit system.
The linear induction motor test bed has fully interchangeable rotors, application specific rotor. The result is a flat stator, or upper section, of iron laminations. 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. Linear motors also lack the mechanical advantage that a gearbox or belt transmission can provide a rotary motor. 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.
Induction motor runs through direct ac line the amount of power given to it decides to what rpm it does rotates. Linear motor powerpoint presentation inductor electric. This project examines the use of linear induction motors lims as the primary. Ive been reading literature until now to understand the principle of the lim, and the objective of my project is to approximate a very. Based on the secondary part of lims structures, linear induction motor can be classified into two shapes. Electric motor electric motor linear induction motors. A linear induction motor is a type of linear motor based on a rotary ac induction motor. Alan foster 2 introduction to linear induction motors lims a lim is basically a rotating squirrel cage induction motor opened out flat. Performance of linear induction motors within an automated transit.
Characteristically, linear induction motors have a finite primary or secondary length, which generates endeffects, whereas a conventional induction motor is arranged. Pdf modeling and simulation of linear induction motor by using. A linear induction motor lim is a noncontacting, high speed, linear motor that operates on the same principal as a rotary, squirrel cage, induction motor. 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 performance of the proposed dtfc method is analyzed with considering endeffect. Linear motors can mitigate the price differences by removing transmission components. Generally, it is known as the asynchronous motor because its running speed is less than its synchronous speed. In a conventional round rotor induction motor the behavior of the machine is only needed to be calculated ov er one pole pi tch. In this type of motor, the stator and rotor are called primary and secondary respectively.
The pulsed linear induction motor university of edinburgh. Ppt linear induction motor powerpoint presentation. The study was carried out to design a 3phase small linear induction motor that can travel at the speed of 1 meter per second when supplied 9 volts. This project examines the use of linear induction motors lims as the primary propulsion source for the superway automated transit network atn. Comparison of linear synchronous and induction motors. 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 analysis of the linear induction motor for the deepunderground highspeed gtx 202 maximum speed should be around 34. 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 history of linear motors date back as far as the 19th century with the work of charles wheatstone in great britain. 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. This paper deals with the design and fabrication of basic linear induction motor lim, suitable for traction application. Project design the proposed project was designed with the main goal of having a high degree of modularity.
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