Devices is designed to carry and interrupt certain levels of current. A study on design of linear motor for maglev for high efficiency. See all formats and editions hide other formats and editions. The work is concerned with theoretical analysis of single and doublesided linear induction motors. Design of highspeed induction motors linear induction motors. If the speeds become equal, there would be no such relative speed, so no emf induced in the rotor, and no current would be flowing, and therefore no torque would be generated. Among many kinds of linear motors, linear induction motorlim is prefer for the urban railway transportation system because the construction cost is much cheaper than linear synchronous. A linear motor is a conventional rotary motor whose stator, rotor and windings have been cut open, flattened, and placed on the guideway. The singlephase induction motor is not selfstarting. High speeds, the maximum speed of a linear motor is limited only by the bus voltage and the speed of the control electronics. Abstractin this paper, a method of calculating the parameters of equivalent circuit model of linear induction motor lim is proposed based on numerical analysis and finite element methodfem.
Design of a single sided linear induction motorslim using a user interactive computer program 32 books linear induction motor 33 patents linear induction motor construction 34 secondary member for singlesided linear induction motor 35 linear induction motor 36. When the motor is connected to a singlephase power supply, the main winding carries an alternating current. Design and simulation of an electromagnetic aircraft launch. He received his bachelors degree in engineering from the university of tokyo and became a lecturer at the university of tokyo immediately upon graduation. Three phase induction motors are employed in almost all the industries because of its simple construction and easy operation. Theory and design of small induction motors hardcover 1959. Bohn for his pioneering development and application of electrical equipment for controlling rectifying. Modeling of linear induction machines for analysis and control by armando jose sinisterra a thesis submitted to the faculty of the college of engineering and computer science in partial fulfillment of the requirements for the degree of master of science florida atlantic university boca raton, florida april 2011. Performance analysis of the linear induction motor for the deep. The pulsed linear induction motor uses technology developed for the sandia coil gun program for electromagnetic launch. Variation of magnetic flux density across an airgap and finite values of permeability and conductivity of the secondary back iron were taken into account in.
Linear induction motors are less efficient than permanent magnet linear motors, and thus produce more heat for a given continuous force output. 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. As a result, they often require forced air or watercooling to achieve published specifications. The amount of thrust produced by the lim is proportional to the active surface area of the motor. Single phase linear induction motor design filetype pdf. Design and simulation of an electromagnetic aircraft. Theory and analysis of three phase induction motor using. Hyungwoo lee, sung gu lee, chanbae park and hyunjune park, characteristic analysis of a linear induction motor for a lightweight train according to various secondary schemes, international journal of railway, vol. Characteristics of linear induction motor considering material of.
Design criteria of tubular linear induction motors and. Mec design and construction of a pulsed linear induction motor. The linear induction motor is one of the most promising propulsion systems for superhighspeed ground transportation. Theory of linear induction motors by sakae yamamura. Sakae yamamura is an electrical engineer best known for his work on magnetic field driving of electrical arc, his work on analytical theory of the linear induction motor and its applications to magnetic levitation, his development of spiral vector theory, and his work on numerically controlled machine tools. The report begins with a derivation of thrust and airgap power using the method of vector potentials and theorem of residues. The method is proved accurately through the traditional removed and locked tests.
Thrust performance improvement of a linear induction motor. Spiral vector theory of ac circuits and machines monographs in electrical and electronic engineering. Motion and temperature heat control are paramount in energy. Exp erimen tal system used to test the pulsed linear induction launc her concept. Electric energy and induction motors the level of prosperity of a community is related to its capability to produce goods and services.
A single sided linear induction motor with finite length of the primary is considered. Nov 11, 2011 additionally, linear induction motors are reversible and can also be dynamically braked. It is the purpose of this paper to present an approximate threedimensional nonlinear numerical analysis for the solidrotor induction motor, based on magnetostatic assumptions and. Construction of three phase linear induction motor. Yamamura, sakae, 1918 theory of linear induction motors. Downloads theory of linear induction motors ebook theory. According to actual structure of highspeed multistage cylinder linear induction motor hsmclim, based on electromagnetic field theory, the mathematical model of the motor is deduced, which considers interstage coupling effect.
Analysis on running process of permanent linear synchronous motors with discontinuous statorsj, journal of xian jiaotong university, 2004, 1238,12921295. But producing goods and services is strongly related to the. Research on performance highspeed multistage cylinder linear induction motor. Characteristically, linear induction motors have a finite primary or secondary length, which generates endeffects, whereas a conventional induction motor is arranged. A linear motor or linear induction motor is an alternating current ac electric motor that has had its stator unrolled so that instead of producing a torque it produces a linear force along its length. Downloads theory of linear induction motors ebook theory of. Free theory of linear induction motors pdf swift books. This site is like a library, use search box in the widget to get ebook that you want. Sep 27, 20 a new method to compensate the end effect of a linear induction motor lim in lowspeed maglev vehicles is proposed. If secondary of the linear induction motor is fixed and the primary is free to move, the force will move the primary in the direction of the travelling wave. Thrust analysis and improvement of single sided linear.
Numerous applications of lims can be found in industry today, one of the most interesting being high speed magnetic levitation railway systems. Characteristics of linear induction motor considering material of reaction plate change meng li school of electrical engineering, beijing jiaotong university, beijing, china email. Choices of basic machine format, and procedures for determining basic dimensions are presented. Table of contents introduction induction motors woundrotor induction motors singlephase induction motors servomotors linear induction motors induction motors for.
Yamamura yamamura s, 1979 and poloujadoff poloujadoff, m et al, 1980 developed the theoretical aspects of lim in detail, especially the influence of longitudinal end effects on its performance. Sakae yamamura, theory of linear induction motors, uni versity 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. Characteristics of linear induction motor considering. A new method to reduce end effect of linear induction motor. Curren t w a v eforms pro duced b y the system in practice and theoretical sim ulation are compared to eac h other, in addition qualitativ ely observing an y motion of the armature coil. The application of linear induction motors to conveyors, proceedings of the iee part a. As a result, the motors magnetic field traveling wave become continuous and the end effect of short primary lims is greatly. Calculations of magnetic flux density, secondary current, forces and power losses in two layers of a secondary are based on fouriers series method. Spiral vector theory of ac circuits and machines monographs in electrical and electronic engineering yamamura, sakae on.
The double sided linear induction motor dlim is shown in the figure below. Yamamura, theory of linear induction motors, tokyo, japan. A linear induction motor lim is a specific type of alternating current ac, multiplephase machine that provides force and movement in a linear direction. Characteristically, linear induction motors have a finite primary or secondary length, which generates endeffects. Threedimensional nonlinear numerical analysis of solid. Finally, we designed a linear induction motor lim for a propulsion system, and we used the finite element. Spiral vector theory of ac circuits and machines monographs. This paper describes the basic design, refinement and verification using finite element analysis fea, and operational simulation using the virtual test bed vtb, of a range of candidate linear machines for an electromagnetic aircraft launching system emals for the aircraft carrier of the future. Premio nikola tesla ieee wikipedia, a enciclopedia livre. Research on performance highspeed multistage cylinder. 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. Design criteria of tubular linear induction motors and generators. Force analysis of linear induction motor for magnetic levitation system.
For contributions to the theory of linear induction motors and the development of magnetic levitation of track vehicles. Force analysis of linear induction motor for magnetic levitation system conference paper pdf available october 2010 with 1,468 reads how we measure reads. A new method to compensate the end effect of a linear induction motor lim in lowspeed maglev vehicles is proposed. In this paper conventional roundrotor theory is extended to the. An aproach which are sperated of magnetic field of linear induction motors and proposed by sadovsky 9 has been shown in figure 1. Theory of linear induction motors yamamura, sakae on. The work is concerned with theoretical analysis of single and doublesided. A linear motor is an electric motor that has had its stator and rotor unrolled thus instead of producing a torque it produces a linear force along its length.
A parallel history of linear induction motors with applications in linear. When selecting a linear induction motor lim it is important to understand the interaction between stator, reaction plate and airgap. Sakae yamamura, theory of linear induction motors, university of tokyo press, 1978. Typical speeds for linear motors are 3 meters per second with 1 micron resolution and over 5 meters per second, 200ips, with coarser resolution.
Click download or read online button to get theory of linear induction motors book now. In this type of motor, the stator and rotor are called primary and secondary respectively. Since conventional induction machine theory has proven inadequate for such machines, the need has arisen for improved methods of investigation. Linear motors complement todays linear motion technologies.
Theory of linear induction motors sakae yamamura snippet view 1972. Theory of linear induction motors download ebook pdf. University of toyko press, 1972 2shangguan xuanfeng, li qingfu, et al. But producing goods and services is strongly related to the use of energy in an intelligent way. Pdf a study on design of linear motor for maglev for. End effect, linear induction motor, lim, lightweight train, reaction plate. Optimalairgap control of a linear induction motor for korean. The double sided linear induction motor has primary on both the sides of the secondary. However, linear motors are not necessarily straight. With this method, the motors are close to each other so that the front motors exitend magnetic field extends into the next motors entry zone. Characteristically, a linear motor s active section has ends, whereas more conventional motors are arranged as a continuous loop. Pdf force analysis of linear induction motor for magnetic. Efficiency of the induction motor is affected by its fixed losses and variable losses which mainly depend on the input supply voltage and load current respectively. Characteristic analysis of a linear induction motor for a lightweight.
Abstract the end effect of a linear induction motor lim has been known for several decades, es. 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. According to actual structure of highspeed multistage cylinder linear induction motor hsmclim, based on electromagnetic field theory, the mathematical model of the motor is deduced, which. Free theory of linear induction motor pdf swift books. Schenectady, ny, usa for contributions to the design, development and performance analysis of.
Index termslinear induction motor, equivalent circuit. These improvements give a hightraction, compact, and efficient linear motor. For his leadership in development and application of small induction motors. Twodimensional analysis of linear induction motor using. Thus from the working principle of three phase induction motor, it may be observed that the rotor speed should not reach the synchronous speed produced by the stator. Shturmans 3, the yamamuras method 10 and a method which utilizes the coefficient of longitudinal end effects 7. Optimalairgap control of a linear induction motor for. Search for library items search for lists search for. Construction of a pulsed linear induction motor figure 3.
Theory of linear induction motors 2nd edition nasaads. A linear induction motor consists of a laminated coil assembly and an aluminum and steel reaction plate. Publishers pdf, also known as version of record includes final page, issue and volume. Sakae yamamura, theory of induction motors, university of tokyo press, 1977.
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