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. They may replace a traditional lift hill and brakes. Normally lim is used to make a motion frictionless. The secondary of the linear induction motor consists of a flat aluminium conductor with a ferromagnetic core. The linear induction motor science publishing group. Lim three phase equivalent circuit automation control as a need to ease the behavior of the prototype, and expanding. Design and fabrication of linear induction motor for traction. A linear induction motor provides linear force and motion rather than rotational torque. Shaded pole motor is a splitphase type single phase induction motor. Then, equation 1 can be shown in terms of magnitude as.
Two magnet rails oppose each other, north and south, as. 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. Linear induction motors can be manufactured in a wide range of force outputs, speeds, and footprints. Working, application and construction is this article describes construction, working, applications and various problems associated with lim or linear. 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. Electric motor construction of induction motors britannica. Lim is an advanced version of rotary induction motor which gives a linear translational motion instead of the rotational motion. The three phase induction motor is the most widely used electrical motor.
Because of open ended construction of linear induction motor, it displays a peculiar effect known as end effect. In a traditional electric motor, the rotor rotating part spins. For singlesided assemblies, the reaction plate consists of 18 thick aluminum backed by a 14 thick steel plate, and for doublesided assemblies the reaction plate is 18 thick aluminum or copper only. 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. A linear induction motor lim is a specific type of alternating current ac motor designed to produce motion in a straight line.
Linear motors are electric induction motors that produce motion in a straight line rather than rotational motion. A lim operates under the same principles as its ac rotary. The basic design and construction of a linear induction motor is similar to a three phase induction motor, although it does not look like a conventional induction motor. A linear induction motor lim is an alternating current ac, asynchronous linear motor that.
Exp erimen tal system used to test the pulsed linear induction launc her concept. If we cut the stator of a polyphase induction motor and lay on a flat surface, it forms the primary of the linear induction motor system. Design of singlesided linear induction motor used in elevator ijsea. Construction of a pulsed linear induction motor figure 3. Mec design and construction of a pulsed linear induction. The page also covers the construction and working principle of the linear induction motor along with. A linear induction motor lim is a form of electromagnetic propulsion containing no moving parts. 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. Construction of a linear induction motor if the stator of the poly phase induction motor is cut along the section and laid on a flat surface, then it forms the primary of. This paper explores the construction process of a linear induction motor lim, the basic concepts behind key aspects of linear induction machines construction and the testing process of a. Ironcore linear motor diagram aircore linear motor construction. Electric motor electric motor linear induction motors.
Induction motor theory jerry bednarczyk, pe course content introduction the ac induction motor is well suited to applications requiring constant speed operation. Linear motor training system labvolt series by festo. Difference between synchronous motor and induction motor. Performance analysis of the linear induction motor for the deepunderground highspeed gtx 202 maximum speed should be around 34.
Almost 80% of the mechanical power used by industries is provided by three phase induction motors. Induction motor seminar ppt, pdf report study mafia. 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. Construction of three phase linear induction motor 4 figure 2. In this type of motor, the stator and rotor are called primary. Comparison of linear synchronous and induction motors. Linear induction motor electrical study app by saru tech. The result is a flat stator, or upper section, of iron laminations. What is a linear induction motor and how does it work. The pulsed linear induction motor university of edinburgh.
The stator is cut axially and spread out flat in linear induction motor lim. Pdf this paper explores the construction process of a linear induction motor lim, the basic concepts behind key aspects of linear induction. The linear motor training system is a useful teaching tool for instructors who wish to demonstrate the basic principles of magnetism as applied to the operation of linear induction. In this type of motor, the stator and rotor are called primary and secondary respectively. Free download induction motor seminar ppt, pdf report. The pulsed linear induction motor concept for highspeed trains b. The shaded pole motor is very popular for ratings below 0. Stator poles rotate at the synchronous speed ns when fed with a three phase supply. 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. Electric motor electric motor construction of induction motors. Design of a single sided linear induction motorslim using a user interactive computer program 32 books linear induction motor 33 patents linear induction motor. If the induction motor is operating in the linear magnetic region, the lm is constant. A linear induction motor lim is an advanced version of rotary induction motor which gives a linear translational motion instead of the rotational.
Linear induction motor abbreviated as lim, is 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. The physics of the dc motor example a linear dc machine 19 consider the simple linear dc machine in figure 1. There are mainly two types of induction motor on the basis of power supply, single phase induction motor and three phase 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. I would just like to add some practical applications of lim. Shaded pole induction motors working and construction. 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. An induction motor or asynchronous motor is an ac electric motor in which the electric current in the rotor needed to produce torque is obtained by electromagnetic induction from the. The linear induction motor is designed for high speed operation. The basic system construction of the shortstator linear induction motor lim drive is shown in figures 14. Performance analysis of the linear induction motor for the. Construction of induction motor the three phase induction motor is a preferable type of motor. The stator frame consists of laminations of silicon steel, usually with a thickness of about 0.
Simple linear motor how to make a simple linear motor duration. It is a machine that runs at a constant speed i,e synchronous speed. Figure 1 shows the chubu hsst maglev vehicles that are being installed on the. 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. Construction of three phase induction motor electrical4u. It is mostly used in industrial drives because it is very reasonable and vigorous, economical and. Characteristically, linear induction motors have a finite primary or secondary length, which generates endeffects, whereas a conventional induction motor is arranged. This paper explores the construction process of a linear induction motor lim, the basic concepts behind key aspects of linear induction machines construction and the testing process of a working. 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.
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