Permanentmagnet based tubular linear motors should not be confused with tubular linear induction motors, which work on a. Pdf design criteria of tubular linear induction motors. The primary comprises a threephase winding and the secondary is a simple steel cylinder. Tubular noncommutated dc linear motor what is a linear motor.
When the flat linear induction machine is rerolled around the motion axis, the tubular linear induction machine is obtained figure 4. Thrust characteristics of conventional tubular lim and fclim are compared using the equivalent circuit parameters. Model of tubular lim for deriving approximate equation of thrust force. Pdf design criteria of tubular linear induction motors and. 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. Design and optimization of tubular linear permanent magnet. When the machine is transformed to create a linear machine, the tangential forces sum each other to constitute the driving force.
The first patent in linear induction motors was obtained by the mayor of pittsburg in 1895. The motor is protected by the thermal effect against burning down. Pdf tubular linear induction motor analysis by using. Electric energy and induction motors the level of prosperity of a community is related to its capability to produce goods and services. Finite element methods applied to the tubular linear.
Pdf the current filaments cfm and the finite elements fem models for analyzing tubular linear induction motor tlim performances are. A general framework for the analysis and design of tubular linear permanent magnet machines pdf. In this paper, we study one kind of tubular linear induction motor which has the primary configuration composed of four pieces of flattype core. A slim of specified parameters is designed using a userinteractive matlab program, and then compared to a similar tubular linear induction motor tlim. Design of a single sided linear induction motor slim. The fem model is used to analyze a specific tlim design at standstill for a given supply current. How an induction motor works by equations and physics introduction. Wonjong kim a design for a novel tubular highprecision directdrive brushless linear motor has been developed. The induction motor is made up of the stator, or stationary windings, and the rotor. A linear induction motor lim is a specific type of alternating current ac, multiplephase machine that provides force and movement in a linear direction. In this type of motor, the stator and rotor are called primary and secondary respectively.
Parametric performance evaluation of the designed 1meter diameter pcptlim system yields encouraging results for practical implementation. 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 technology is not new but merely designed in a different form. But producing goods and services is strongly related to the. The design equations of the slim and the equivalent circuit model are studied and discussed in detail. Tubular motors can then be realised by rolling the flat linear motor around the length of travel. Though some losses are occurred in the plate, the overall ef. The current filaments cfm and the finite elements fem models for analyzing tubular linear induction motor tlim performances are presented. Analysis and design criteria of a tubular linear induction. Tubular linear motors are used in applications requiring linear actuators with performance that cannot be met. Abstract tubular linear induction motor tlim can be used as a capsule pump in a large pneumatic capsule pipeline pcp system. A tubular linear motor is a type of linear electric motor with a forcer consisting of a series of. Tubular linear induction motor for hydraulic capsule.
How an induction motor works by equations and physics. To size a linear motor for a horizontal application you need to know. Antonino musolino, rocco rizzo, and ernesto tripodi. These include curved motors, faceplate type drives and tubular motors. Calculating linear motor requirements baldor motion. 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. Design criteria of tubular linear induction motors and generators. For low speed applications both flat and tubular linear induction motors tlim are suitable. In this paper, the study uses a finite element solver with the commercial software magnet from infolytica cooperation. Abstractin this paper, a doublesided stator tubular linear induction machine is. The application of linear induction motors to conveyors, proceedings of the iee part a.
A sensorless tubular linear motor was constructed and driven by three di. Characteristically, a linear motors active section has ends, whereas more conventional motors are arranged as a continuous loop. 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. Design criteria of tubular linear induction motors and. Sizes vary from fractional horsepower to several thousand horsepower used for such appli. 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. Used in many industrial and hightech fabrication applications, linear motors are an invaluable part for the fastest and most efficient processes. Induction motors are the commonest type of motor and account for a very large proportion of heavy duty motors. 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. They performed optimization by using rsm to decrease motor weight and increase thrust. Vincenzo di dio1, giovanni cipriani1, rosario miceli1, and renato rizzo2. Induction motor theory jerry bednarczyk, pe course content introduction the ac induction motor is well suited to applications requiring constant speed operation. Dynamic performances of tubular linear induction motor for. A study on technical feasibility of applying tubular linear induction.
They are capable of speeds up to 1800 insec 45 ms and are typically used in applications where accurate positioning is not required. Example images of some of the various topologies are shown below. 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. Force engineering ltd linear induction motor options. Baldor linear motors and stages steven engineering. 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. Technical characteristics of tubular linear drives. 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. Ac induction linear induction open closed loop polynoid open loop, low duty cycle b stage type preferred. Development and performance of a linear induction motor. Figure 2 shows the model of the tubular linear induction motor and inscribes the. 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. However, linear motors are not necessarily straight.
Design of singlesided linear induction motor science publishing. But tubular, or shafttype, linear motors have a construction principle that provides higher efficiency and makes them especially wellsuited for gantry applications. Tubular linear induction motor analysis by using finite. Development and analysis of two alternative tubular linear motors. The finite element formulation of the field equations is discussed and the magnetic field. The aim of this work is to present a mathematical model for the linear induction motor. Analysis and design criteria of a tubular linear induction motor for a possible use in the electromagnetic aircraft launch system abstract. 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. Active magnetic bearing applied to a tubular linear. Induction motors with rotor helical motion a dissertation submitted to the graduate faculty of the louisiana state university and agricultural and mechanical college. The improvement of the characteristics in tubular linear.
Leonardo electronic journal of practices and technologies issue 23, julydecember 20 issn 15831078 p. In this blog post, we will explore how to customize the linear. 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 and optimization of tubular linear permanent magnet generator with.
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. 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. Design and construction of a precision tubular linear motor and controller. The singlesided linear induction motor is by far the. Fem analyze of a simple module of the linear tubular stepping motor.
Tubular linear induction motor analysis by using finite elements and current filament models. A parallel history of linear induction motors with applications in linear. A maximum weights of moving load b length of move and overall travel. Pdf in this paper a mathematical model of tubular linear induction machines tlim with hollowed induced part is recalled. The position of the forcer, the electrical current and the potential di. Numerous applications of lims can be found in industry today, one of the most interesting being high speed magnetic levitation railway systems. He tubular induction motors are used as long course actuators. Tubular linear motors consist of a thrust rod or tube with permanent magnets and a stator sometimes referred to as a forcer with coils.
Its functioning principle is similar to that of the traditional induction linear motor. The lim operator shall consist of a control unit, one or more linear induction motors and reaction fin sections. The rotating machinery, magnetic physics interface available in the acdc module is used to model rotating machines such as motors or generators. Modeling linear motors or generators in comsol multiphysics. Baldor linear motors and stages are used in thousands. Rotor shape influence on tubular induction actuator force. Design optimization and control strategies for pm multiphase tubular linear actuators page symmetry of the machine. It is well known that tubular linear induction machines have the highest force to moving mass ratio when compared with other linear motors. 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.
Design optimization and control strategies for pm multiphase. 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. 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. The linear tubular motor can also be regarded as a propulsion system. 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. Analysis and optimization of starting characteristics of. 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.
Edge effect and independently supplied slot currents in. 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. Since laithwaites work on linear induction motors, many other types. Design optimization and efficiency enhancement of linear. In general, the induction motor is cheaper and easier to maintain compared to other alternatives. The doublesided tubular linear induction motor and. This is the small model of linear tubular induction motor. This paper focuses on the tubular linear induction motor tlim with low cost and simple control structure which directly drives the punching machines. 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. The tubular motor manufactured by us is available in a compact design but it provides a large torque and running without noise. The core groups are coupled together radially about an axis with the slots of the core groups facing each other toward the axis.
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