Wonjong kim a design for a novel tubular highprecision directdrive brushless linear motor has been developed. Technical characteristics of tubular linear drives. How an induction motor works by equations and physics introduction. The improvement of the characteristics in tubular linear. Traditional mechanical punching machines are mainly driven by rotary motors and a complete set of intermediate transformation mechanism is needed, which results in a reduction of the system efficiency. Pdf the current filaments cfm and the finite elements fem models for analyzing tubular linear induction motor tlim performances are. A sensorless tubular linear motor was constructed and driven by three di. Dynamic performances of tubular linear induction motor for. Modeling linear motors or generators in comsol multiphysics. They are capable of speeds up to 1800 insec 45 ms and are typically used in applications where accurate positioning is not required. Its functioning principle is similar to that of the traditional induction linear motor. A tubular linear primary element is constructed of a plurality of core groups, each core group being constructed of a plurality of laminated combshaped plates, each plate having a plurality of radially aligned teeth and slots. 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. The finite element formulation of the field equations is discussed and the magnetic field.
The current filaments cfm and the finite elements fem models for analyzing tubular linear induction motor tlim performances are presented. In this blog post, we will explore how to customize the linear. In this paper, we show a new winding method that improves the efficiency of the primary core, energy density and flux modulation as well as space harmonic distribution in low speed lim. Figure 2 shows the model of the tubular linear induction motor and inscribes the. However, linear motors are not necessarily straight. Parametric performance evaluation of the designed 1meter diameter pcptlim system yields encouraging results for practical implementation. It has a patented structure with smooth brake which prevent sliding down. A tubular linear motor is a type of linear electric motor with a forcer consisting of a series of. The technology is not new but merely designed in a different form.
Ac induction linear induction open closed loop polynoid open loop, low duty cycle b stage type preferred. Recently, more and more attentions are focused on linear motors due to their characteristics that they can directly transform electricity energy into linear motion, among them tubular linear motors are widely used as launchers for spaceuse, and used in industry robots. A study on technical feasibility of applying tubular linear induction. Linear induction machines resemble the principle and the topologies of rotary induction machines by the cutting and unrolling principle to obtain flat linear induction machines figure 3 2.
Design optimization and efficiency enhancement of linear. Design optimization and control strategies for pm multiphase. The aim of this work is to present a mathematical model for the linear induction motor. The doublesided tubular linear induction motor and. To size a linear motor for a horizontal application you need to know. Rotor shape influence on tubular induction actuator force. Tubular linear motors are used in applications requiring linear actuators with performance that cannot be met. The fem model is used to analyze a specific tlim design at standstill for a given supply current. These include curved motors, faceplate type drives and tubular motors. Example images of some of the various topologies are shown below. The innovative linx cylindrical linear motor international patent pending offered by anca motion provides improved performance at lower cost when compared to conventional flat linear motors and rotary motors. 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. Design optimization and control strategies for pm multiphase tubular linear actuators page symmetry of the machine. Pdf design criteria of tubular linear induction motors.
This paper focuses on the tubular linear induction motor tlim with low cost and simple control structure which directly drives the punching machines. Tubular linear induction motor analysis by using finite elements and current filament models. A cylindrical tubular armature 23 can move within the tubular indoctor 24, guided by any suitable means, for instance means with air cushions, the tubular armature 28 may constitute, the frame of a vehicle moving along the path defined by the tubular rail 24. Used in many industrial and hightech fabrication applications, linear motors are an invaluable part for the fastest and most efficient processes. A maximum weights of moving load b length of move and overall travel.
Pdf tubular linear induction motor analysis by using finite. Edge effect and independently supplied slot currents in. A semianalytical model of the double sided tubular linear induction motor dstlim is adopted for the optimization of the thrust force of the stages of. In this paper the design of a tubular linear induction machine is presented because from this theory the dual generator machines can be in a simple way. The governing equations of cfm model can be reduced to the ordinary differential equations that can be solved by numerical method and it is easy to program. Numerous applications of lims can be found in industry today, one of the most interesting being high speed magnetic levitation railway systems. Since laithwaites work on linear induction motors, many other types. Design and optimization of tubular linear permanent magnet. A tubular linear motor is a type of linear electric motor with a forcer consisting of a series of solenoids wrapped around a cylinder enclosing a movable rod that contains a number of strong cylindrical permanent magnets aligned in alternating and opposing directions. But producing goods and services is strongly related to the. Induction motors with rotor helical motion a dissertation submitted to the graduate faculty of the louisiana state university and agricultural and mechanical college.
For example, a permanent magnet dc linear motor is similar to a permanent magnet dc rotary motor and an ac induction linear motor is similar to a squirrel cage induction motor. An axisymmetric model of the magnetic field of the tubular linear induction motor tlim for application to hydraulic capsule pipelines is developed using finite element method fem analysis. Baldor linear motors and stages steven engineering. A parallel history of linear induction motors with applications in linear. Analysis and optimization of starting characteristics of. Fem analyze of a simple module of the linear tubular stepping motor. Tripodi department of energy and system engineering, university of pisa, via diotisalvi 2, pisa 56126, italy abstractin this paper, some design criteria for a tubular linear induction motor tlim as a fast actuator are considered. In general, the induction motor is cheaper and easier to maintain compared to other alternatives. Force engineering ltd linear induction motor options. The rotating machinery, magnetic physics interface available in the acdc module is used to model rotating machines such as motors or generators. The motor is protected by the thermal effect against burning down. Though some losses are occurred in the plate, the overall ef. Development and analysis of two alternative tubular linear motors.
Leonardo electronic journal of practices and technologies issue 23, julydecember 20 issn 15831078 p. The tubular motor manufactured by us is available in a compact design but it provides a large torque and running without noise. Analysis and design criteria of a tubular linear induction. Design criteria of tubular linear induction motors and generators. Tubular linear induction motor analysis by using finite. The singlesided linear induction motor is by far the. For low speed applications both flat and tubular linear induction motors tlim are suitable. Tubular motors can then be realised by rolling the flat linear motor around the length of travel. The core groups are coupled together radially about an axis with the slots of the core groups facing each other toward the axis. Electric energy and induction motors the level of prosperity of a community is related to its capability to produce goods and services.
How an induction motor works by equations and physics. A general framework for the analysis and design of tubular linear permanent magnet machines pdf. Tubular linear induction motor for hydraulic capsule. The lim operator shall consist of a control unit, one or more linear induction motors and reaction fin sections. Characteristically, a linear motors active section has ends, whereas more conventional motors are arranged as a continuous loop. The induction motor is made up of the stator, or stationary windings, and the rotor. He tubular induction motors are used as long course actuators. The overall area available for the linear induction motor drive is an important characteristic, as this determines the size and possible output power of motors that will fit within the system. Design and optimization of tubular linear permanent magnet generator with. Pdf design criteria of tubular linear induction motors and. The high speed and acceleration, standalone thermal stability and the ability to achieve high ip67 protection make linx an ideal solution for machine tools, food processing and other.
Design of singlesided linear induction motor science publishing. Thrust characteristics of conventional tubular lim and fclim are compared using the equivalent circuit parameters. Sizes vary from fractional horsepower to several thousand horsepower used for such appli. A linear induction motor lim is a specific type of alternating current ac, multiplephase machine that provides force and movement in a linear direction. A slim of specified parameters is designed using a userinteractive matlab program, and then compared to a similar tubular linear induction motor tlim. Calculating linear motor requirements baldor motion. When the machine is transformed to create a linear machine, the tangential forces sum each other to constitute the driving force. When modeling the linear or tubular device with the magnetic fields and the moving mesh physics interfaces, it is appropriate to use a customized linear periodic boundary condition.
Instead of producing rotary torque from a cylindrical machine it produces linear force from a flat one. Active magnetic bearing applied to a tubular linear. The position of the forcer, the electrical current and the potential di. Induction motors are the commonest type of motor and account for a very large proportion of heavy duty motors. Tubular noncommutated dc linear motor what is a linear motor. Abstract tubular linear induction motor tlim can be used as a capsule pump in a large pneumatic capsule pipeline pcp system. Design and construction of a precision tubular linear motor and controller. In this type of motor, the stator and rotor are called primary and secondary respectively.
The first electromagnetic gun was undoubtedly birkelands cannon of 1918, again a reluctance device, but possibly the first tubular motor using a row of simple coils energized in sequence with dc. The first patent in linear induction motors was obtained by the mayor of pittsburg in 1895. Linear induction motor background alternating current ac electric motor powered by a three phase voltage scheme force and motion are produced by a linearly moving magnetic field used in industry for linear motion and to turn large diameter wheels 6 4. Design criteria of tubular linear induction motors and. Design of a single sided linear induction motor slim. Baldor linear motors and stages are used in thousands. Pdf in this paper a mathematical model of tubular linear induction machines tlim with hollowed induced part is recalled. The motor studied is composed of four coils, three non magnetic separations between the coils and a mover. In this paper, we study one kind of tubular linear induction motor which has the primary configuration composed of four pieces of flattype core. In this paper a double stator tubular linear induction machine is presented and its performance are discussed for a possible use as a catapult in the electromagnetic acceleration of aircrafts. Permanentmagnet based tubular linear motors should not be confused with tubular linear induction motors, which work on a. Pdf tubular linear induction motor analysis by using. It is well known that tubular linear induction machines have the highest force to moving mass ratio when compared with other linear motors. In this paper, the study uses a finite element solver with the commercial software magnet from infolytica cooperation.
The linear tubular motor can also be regarded as a propulsion system. Development and performance of a linear induction motor. Antonino musolino, rocco rizzo, and ernesto tripodi. Analysis and design criteria of a tubular linear induction motor for a possible use in the electromagnetic aircraft launch system abstract. But tubular, or shafttype, linear motors have a construction principle that provides higher efficiency and makes them especially wellsuited for gantry applications. Induction motor theory jerry bednarczyk, pe course content introduction the ac induction motor is well suited to applications requiring constant speed operation. The linear induction motor lim is structurally divided into the flat and the tubular type. 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. Model of tubular lim for deriving approximate equation of thrust force.
When the flat linear induction machine is rerolled around the motion axis, the tubular linear induction machine is obtained figure 4. They performed optimization by using rsm to decrease motor weight and increase thrust. The application of linear induction motors to conveyors, proceedings of the iee part a. Tubular linear motors consist of a thrust rod or tube with permanent magnets and a stator sometimes referred to as a forcer with coils. Finite element methods applied to the tubular linear. Vincenzo di dio1, giovanni cipriani1, rosario miceli1, and renato rizzo2.
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