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Halkyard, Peter. "Terfenol-D magnetostrictive linear motor." Thesis, University of Salford, 2011. http://usir.salford.ac.uk/26704/.
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Actuators and linear motors are a common way to provide single axis motion and force. Rack and pinion, chain, belt, cable, screw, hydraulic and electric solenoid are a few of the many types of actuators available. All have inherent strengths and weakness such as power consumption, mechanical failure and usually a trade off with speed and resolution. The thesis investigation is to develop a linear motion actuator based on the magnetic material, Terfenol-D which alters its shape when subjected to a magnetic field. This phenomenon is known as magnetostriction which can be defined as a changing of a material's physical dimensions in response to its magnetization. Terfenol-D has the largest known magnetostriction, 2000ppm at ambient temperatures [1], of all commercially available materials. Because of these large strains it is given the term Giant Magnetostriction (GM). In Terfenol-D the GM is dependent on the direction of the applied magnetic field with respect to the direction in the crystal: the material elongates in the direction of the field and, orthogonal to this, the material contracts within the principal of constant volume. This property has been exploited by other researchers in the past resulting in Terfenol-D being used as a short stroke conventional actuator in applications requiring large force at both high and low frequencies, generating a range of applications including surgical instruments, ultrasonic transducers and many others. It is this property of Terfenol-D that will be exploited in this project in the development of the magnetostrictive linear motor. Stepping motors based upon Giant Magnetostrictive (GM) materials are more complex actuators than those based on a more conventional design. To get a long stroke, they use the addition of several small steps, each produced by quasi static deformation of the GM materials. In this project the Kiesewetter Elastic Wave Motor using Terfenol-D, as referenced in the abstract, was used as the starting point for the design of a new Terfenol-D based motor. In particular, the project investigates different topologies of Terfenol-D in the design and construction of a Magnetostrictive Linear Motor
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Crawford, Douglas Stewart. "Sensor designand feedback motor control for two dimensional linear motors." Thesis, Massachusetts Institute of Technology, 1995. http://hdl.handle.net/1721.1/37546.
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Stroinski, Krzysztof Jerzy. "Generalized linear models in motor insurance." Thesis, Heriot-Watt University, 1987. http://hdl.handle.net/10399/1044.
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Manchen, Manfred Ludwig. "Shaded-pole flat linear induction motor." Thesis, Cape Technikon, 1990. http://hdl.handle.net/20.500.11838/1137.
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Thesis (Masters Diploma (Heavy Current)) -- Cape Technikon, 1991Linear induction motors are built for numerous applications. Their robustness, gearfree-link to the load and the fact that speed is not a function of the number of poles (as in round machines) are only a few advantages. As every single phase motor needs some starting aid, so does a linear induction drive. For round machines, capacitors or shaded poles are usually used. A capacitor can be damaged electrically, which is a rare occurrence for shading rings. A useful combination of these advantages is a linear induction motor which is gearless and uses the shaded pole principle as a starting aid. In order to simplify the designing process, a computer program (Fortran) was written. The main objective on the electrical side was to obtain low input power, high power factor and high efficiency. In order to find the performance curves, torque measurements were made. Although the principles of torque measurements are well known the device to measure torque for this machine was not available and had to be constructed.
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Johnson, Andrew P. (Andrew Peter). "High speed linear induction motor efficiency optimization." Thesis, Massachusetts Institute of Technology, 2005. http://hdl.handle.net/10945/11052.
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CIVINSCIVINS
One of the reasons linear motors, a technology nearly a century old, have not been adopted for a large number of linear motion applications is that they have historically had poor efficiencies. This has restricted the progress of linear motor development. The concept of a linear motor as a rotary motor cut and laid out flat with a conventional rotary motor control scheme as a design basis may not be the best way to design and control a high-speed linear motor. End effects and other geometry subtleties of a linear motor make it unique, and a means of optimizing efficiency with both the motor geometry and the motor control scheme will be analyzed to create a High-Speed Linear Induction Motor (LIM) with a higher efficiency than what is possible with conventional motors and controls. This thesis pursues the modeling of a short secondary type Double-Sided Linear Induction Motor (DSLIM) that is proposed for use as an Electromagnetic Aircraft Launch System (EMALS) aboard the CVN-2 1. Mathematical models for the prediction of effects that are peculiar to DSLIM are formulated, and their overall effects on the performance of the proposed machine are analyzed.;3 |a(cont.) These effects are used to generate a transient motor model, which is then driven by a motor controller that is specifically designed to the characteristics of the proposed DSLIM. Due to this DSLIM's role as a linear accelerator, the overall efficiency of the DSLIM will be judged by the kinetic energy of the launched projectile versus the total electric energy that the machine consumes. This thesis is meant to propose a maximum possible efficiency for a DSLIM in this type of role.
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Sharp, Scott L. "Design of a Linear Ultrasonic Piezoelectric Motor." BYU ScholarsArchive, 2006. https://scholarsarchive.byu.edu/etd/997.
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A new geometrically unique ultrasonic motor (USM) was designed using finite element modeling (FEM). A USM operates by vibrating a drive tip in an elliptical motion while it is in periodic contact with a driven surface. Piezoelectric elements are used to create the elliptical motions and are driven near a resonant frequency to create the needed displacements for the motor to operate. An idea for a motor frame was conceived that consisted of an arch, a center ground, and two piezoelectric elements connected to the center ground. End caps were added between the frame and the piezoelectric elements to reduce the stress of the elements. Legs located at the bottom of were used to increase the rigidity. Several FEM programs were written to design the motor and to predict its performance. The FEM motor model exceeded the performance characteristics of the benchmark Nanomotion HR1. The model predicted a linear motor capable of pushing up to 5 N and a maximum speed of 0.4 m/s. A prototype frame was built out of tool steel and run against an oxide ceramic plate. The USM prototype's piezoelectric elements did not provide the expected displacements in the motor frame as determined by the FEM. The discrepancy was determined to be caused manufacturing errors. Soft glue layers were thicker than expected on each side of the piezoelectric elements causing a large amount of compliance inline with the piezoelectric motion. An additional unexpected layer of glue between the end cap and frame increased the compliance inline with the piezoelectric elements even more. It was also determined that even if the motor had been assembled properly that Hertzian displacement would have caused a 1/3 decrease in piezoelectric motion. The prototype frame's steady state displacements were approximately 20% of the expected output from the FEM models. The motor was still able to achieve a maximum speed of 55.6 mm/s and a push force of 0.348 N at a preload of 6 N. It is expected that a motor assembly correctly dimensioned and manufactured and designed to minimize Hertzian displacement would result in a significantly better performing prototype.
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Ismael, Adel. "Microprocessor-controlled brushless DC linear stepping motor." Thesis, Cardiff University, 2018. http://orca.cf.ac.uk/119080/.
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Presently, there is a rapidly growing research interest for an efficient, high thrust density and high thrust to input power electrical linear machine. However, only limited work has been carried out in terms of the development of brushless DC linear motors (BDCLM). Focusing on this research gap which presently exist in this field, this thesis makes the development of the BDCLM the research objective, in order to produce a large thrust to input power, compared to the already existing designs. The motor is designed in such way that the motor core accommodates twenty-four independent multi-layer coil sections wound with enamelled copper wire and each layer section has 470 turns without compromising the effective air-gap. Also, a design commutation algorithm to provide a smooth movement and a high thrust for the BDCLM is implemented. The design, analysis and optimization of the BDCLM in applications that requires a high thrust to input current ratio is described in this project. The investigation includes; the analysis, design, and control of the BDCLM through appropriate modelling, construction and experimental validation of the modelled results, employing both the static and dynamic approaches. The BDCLM design was analysed from electrical, mechanical and magnetic perspectives. A Finite Element Method (FEM) was used to predict the performance of the BDCLM and to optimise the motor parameters. Additional challenges such as force ripple and normal force are investigated and analysed. A Proportional Integral Derivative (PID) control system, based on an Arduino Mega board is used to control the motor speed and position. A graphical user interface (GUI) is built in LabVIEW environment to control the Arduino board. V The experimental results were within 8.9 %, 2 % and 3 % of the modelled results with respect to the motor thrust, speed and position. These results demonstrate a good agreement between the two approaches. This research work can be considered as an initial step to developing the BDCLM for commercial applications.
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Chow, Irene A. (Irene Ai Tze). "Design of a two-axis linear motor." Thesis, Massachusetts Institute of Technology, 1993. http://hdl.handle.net/1721.1/12349.
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Choi, Henry O. "A linear ultrasonic motor for nano-technology." Thesis, Massachusetts Institute of Technology, 1996. http://hdl.handle.net/1721.1/38148.
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Pippi, Rafael Silva. "Motor ultra-sônico linear com geometria tubular." Universidade Federal de Santa Maria, 2008. http://repositorio.ufsm.br/handle/1/3656.
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Coordenação de Aperfeiçoamento de Pessoal de Nível SuperiorThis work presents the study on a linear ultrasonic motor with tubular geometry for linear displacements. Similar topologies, reported elsewhere, are conceived for producing rotary motions. Due to some particular characteristics of this geometry, not explored yet, a new study on interaction between resonance modes in a hollow cylinder for linear movement generation is proposed. In order to experimentally investigate the resonance modes in tubular stators, a proof of concept prototype was built and tested. The prototype consisted of a internally toothed phosphore bronze tube, excited by two PZT rings. Several types of mobile axes, with one or more solid cylinders of aluminum or stainless steel, were employed. The methodology of test consisted of changing geometric parameters, properties of materials, sweeping driving conditions, and observing the respective movement on the shaft. Tests showed the production of linear and/or angular movements, with maximum speeds of 0,07m/s, but with little uniformity and repeatability. The lack of conclusive hypothesis on the stability issue, based only on experimental set of results, has led to a reassessment of the methodology of investigation, including additional analysis tools for the characterization of the device. So, a simple analytical modeling of the stator was formulated to set up a project methodology. Despite its simplicity and limitations, the analytical model allows a first order approximation for resonance modes, and relates them to the constructive parameters of the stator. In order to take the influence of the factors neglected in the analytical modeling into account, the analysis was complemented with finite element method (FEM) simulations. The deformation profiles of the stator to the 21st resonance mode were analyzed using FEM. With the results, it is possible to predict the behavior of the resonance frequencies, and the corresponding deformations they produce on the teeth, for each stator configuration. The most important result of this analysis is to show the relationship between aspect ratio of ellipsoidal trajectory on the stator teeth and the geometry of the stator. This allows a conclusive diagnosis on the inefficiency of the built prototype: The small amplitude of the longitudinal component of traveling deformation wave. An analysis of simulations results has lead to a design methodology for this new type of motor. The results showed that if the stator is redesigned according to the proposed methodology, it would be able to produce longitudinal deformations of 2.6 μm, with ceramics driven at 35.3 V. If Compared to simulations of the prototyped stator the new project exhibits an increase of 90% for radial deformation components of, and 3600% for the longitudinal components, indicating that if the new design was implemented, it could achieve much higher efficiency in movement production.
Este trabalho apresenta o estudo de um motor ultra-sônico com geometria tubular para movimentos lineares. Outros motores com geometria tubular, encontrados na bibliografia, são concebidos para a produção de movimentos rotativos. Devido a diversas características ainda não exploradas desta geometria, um novo estudo sobre a interação dos modos naturais de vibração de um cilindro vazado para a geração de movimento linear é proposto. Com o objetivo de investigar experimentalmente os modos de ressonância em estatores tubulares, um protótipo para prova de conceito foi construído e ensaiado. O protótipo consiste de um tubo vazado, dentado internamente, excitado por dois anéis de PZT. Foram utilizados diversos tipos de eixos móveis, com um ou mais cilindros maciços de alumínio ou aço inoxidável. A metodologia de ensaio consistiu da variação dos parâmetros geométricos, propriedades de materiais e condições de acionamento, e da respectiva observação e medição dos movimentos do eixo. Os testes evidenciam a produção de movimentos lineares e/ou angulares com velocidades máximas de aproximadamente 0,07m/s, mas com pouca uniformidade e repetibilidade. A impossibilidade de uma análise conclusiva sobre a instabilidade do motor com base apenas nos resultados experimentais de bancada motivou uma reavaliação da metodologia de estudo e a busca de ferramentas adicionais para a caracterização do dispositivo. Uma modelagem analítica do estator foi formulada para que um roteiro de análise e cálculos dimensionais pudessem ser estabelecidos. Embora simples e com diversas limitações, o modelo obtido permite aproximações de primeira ordem para os modos de ressonância em função dos parâmetros construtivos do estator. Para que a influência das não-linearidades não incluídas na modelagem possa ser avaliada, a análise foi complementada com simulações pelo método dos elementos finitos (FEM). Os perfis das deformações do estator até o 21o modo de ressonância foram analisados utilizando FEM. Com os resultados obtidos, é possível prever o comportamento das freqüências naturais e das deformações nos dentes em função das características do estator. O resultado mais importante desta análise é mostrar a relação de aspecto da trajetória elipsoidal dos dentes do estator, com a geometria do estator, permitindo um diagnóstico conclusivo sobre a ineficiência do protótipo construído: A baixa amplitude da componente de deformação longitudinal da onda viajante no tubo. O estudo dos resultados das simulações permitiu o estabelecimento de um roteiro de análise e cálculos dimensionais para este novo tipo de motor. Simulações realizadas mostraram que um estator projetado com o roteiro proposto, é capaz de produzir deformações longitudinais de 2,6μm e radiais de 3,8μm, quando as cerâmicas piezelétricas são acionadas a 35,3 V. Comparando-se os resultados das simulações do estator prototipado com o novo projeto, observa-se um acréscimo teórico de 90% nas componentes de deformação radial e 3600% nas componentes longitudinais, indicando que um novo protótipo construído de acordo com o projeto pode atingir uma eficiência muito superior na produção de movimento.
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Liebman, Michael Kevin 1974. "Thermally efficient linear motor analysis & design." Thesis, Massachusetts Institute of Technology, 1998. http://hdl.handle.net/1721.1/10078.
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Vaughan, Mark Edward. "The Design, Fabrication, and Modeling of a Piezoelectric Linear Motor." Thesis, Virginia Tech, 2001. http://hdl.handle.net/10919/36464.
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The focus of this research was to create a linear motor that could easily be packaged and still perform the same task of the current DC motor linear device. An incremental linear motor design was decided upon, for its flexibility in which the motor can be designed. To replace the current motor it was necessary to develop a high force, high speed incremental linear motor. To accomplish this task, piezoelectric actuators were utilized to drive the motor due their fast response times and high force capabilities.
The desired overall objectives of the research is to create an incremental linear motor with the capability of moving loads up to one hundred pounds and produce a velocity well over one inch per second. To aid the design process a lumped parameter model was created to simulate the motor's performance for any design parameter. Discrepancies occurred between the model and the actual motor performance for loads above 9.1 kilograms (20 pounds). The resulting model, however, was able to produce a good approximation of the motor's performance for the unloaded and lightly loaded cases.
The phase one design was limited by time constraints so a relatively low risk design was produced. The resulting incremental linear motor produced a velocity of 4.9 mm/sec (0.2 in/sec) at a drive frequency of 50 Hz. The velocity of the motor was limited by the drive frequency that the amplifiers could produce. The motor was found to produce a respectable stall load of 17 kilograms (38 pounds). The stall load of the phase one design was severely limited by clearance losses. An analysis of the motor's performance was conducted, possible improvements and future work recommendations for a phase two design are presented.Master of Science
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Manuk, A. K. "The half-speed linear machine : A new form of linear synchronous motor." Thesis, University of Bristol, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.372018.
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Gupta, D. K. "Transportation of ferromagnetic powder using linear motor devices." Thesis, Loughborough University, 1994. https://dspace.lboro.ac.uk/2134/9219.
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The travelling magnetic wave of a linear induction motor induces eddy currents in a secondary circuit (usually a sheet consisting at least partly of a non-magnetic metal, often aluminium), which cause the unrestrained member to move linearly in the direction of the travelling wave. A linear motor can also transport ferromagnetic powder, although this travels in the opposite direction to the travelling magnetic field. The motion is therefore due to a mechanism other than the eddy currents flowing in the sheet secondary. Expressions for the forces acting on an iron particle due to a travelling magnetic field are derived in the thesis. Preliminary experiments support the assumptions made in the derivations of the force expressions and lead to the formation of an hypothesis. This is shown to be capable of predicting both linear and rotational particle speeds and, with greater accuracy, the distance travelled and the rotation experienced by the particles. Experiments conducted on tubular and transverse flux motors have enabled different linear motors to be identified as suitable for a number of powder transportation applications. The results obtained show also the importance of large flux density values, the tangential to normal flux density ratio and large pole-pitch winding arrangements, with the latter lending support to the original hypothesis. The results of a finite element investigation of the tubular motor did not closely agree with the results from the experimental motor although similar trends were evident. Flux density values within particles were found to be considerably greater than those outside, as assumed in the hypothesis.
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Ouhab, Boussad. "Optimisation of a cylindrical linear switched reluctance motor." Thesis, University of Leeds, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.419026.
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Abraham, Joseph. "Modeling and simulation of a linear motor system." Thesis, Massachusetts Institute of Technology, 1997. http://hdl.handle.net/1721.1/43424.
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Bauer, Markus Georg. "DESIGN OF A LINEAR HIGH PRECISION ULTRASONIC PIEZOELECTRIC MOTOR." NCSU, 2001. http://www.lib.ncsu.edu/theses/available/etd-20010926-162049.
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BAUER, MARKUS GEORG. Design of a Linear High Precision Ultrasonic Piezoelectric Motor. (Under the direction of Dr. Thomas A.Dow.)To understand the operating principles of linear ultrasonic piezoelectric motors, a motor made by Nanomotion Ltd. was examined and a model of the driving process was developed. A new motor has been designed that uses the same driving process but improves resolution, speed, efficiency and especially controllability. All designs involve at least two independently driven piezoelectric elements, one generating the normal load at the interface and the second generating the tangential driving force. The greatest challenges in developing this motor are 1) the actuator needs to have two different mode shapes at nearly the same frequency and 2) each mode shape must be exclusively excited by one actuator and not by the other. The quality of the operation of the motor directly depends on how well the excitation of both vibrations can be separated.Finite element analysis (FEA) has been used to model the actuator and predict the dynamic properties of a future prototype. The model includes all significant features that have to be considered such as the anisotropy of the piezoelectric material, the exact properties and the dimensions of the actuators (including all joints). Several prototypes have been built, and the resulting mode shapes and natural frequencies have been measured and compared to the computer models. The design concepts as well as the modeling techniques have been iteratively improved. Open loop testing has shown that the motor generates slideway motion such that the steady state slideway velocity is proportional to the excitation voltage. To fully characterize the motor and to demonstrate its full potential for positioning tasks, the motor has been tested in a closed loop control system. Despite saturation of the control input and nonlinearities in dynamics of the motor-slideway system, it was shown that a simple feedback control system using proportional gain or proportional-integrating control algorithms can be used to achieve a stable responsive positioning system.
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Hu, Yifei. "Linear Induction Motor Investigation and Design for Articulated Funiculator." Thesis, KTH, Elektrisk energiomvandling, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-177816.
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Articulated Funiculator is a new and innovative concept developed by Tyréns forachieving a more efficient vertical transportation with a higher space utilization.Having a variety of merits, i.e.: simple construction, direct electromagneticthrust propulsion, and high safety and reliability in contrast to rotary inductionmotor, linear induction motor (LIM) is considered to be one of the cases as thepropulsion system for Articulated Funiculator. The thesis is then carried outwith the purpose of determining the feasibility of this study case by designing theLIMs meeting some specific requirements. The detailed requirements include: aset of identical LIMs are required to jointly produce the thrust that is sufficientto vertically raise the moving system up to 2 m/s2; the size of the LIMs cannotexceed the specification of the funiculator; the maximum flux density in the airgap for each LIM is kept slightly below 0.6 T; no iron saturation of any part ofthe LIMs is allowed.In this thesis report, an introduction of LIM is firstly presented. Followingthe introduction, relevant literature has been reviewed for a strengthenedtheoretical fundamentals and a better understanding of LIM’s history and applications. A general classification of LIMs is subsequently introduced. In addtion,an analytical model of the single-sided linear induction motor (SLIM) has beenbuilt based on an approximate equivalent circuit, and the preliminary geometryof the SLIM is thereby obtained. In order to acquire a more comprehensiveunderstanding of the machine characteristics and a more precise SLIM design, atwo-dimensional finite element method (2D-FEM) analysis is performed initiallyaccording to the preliminary geometry. The results, unfortunately, turn out tobe iron severely saturated in the teeth and yoke, and a excessive maximumvalue of air-gap flux density. Specific to the problems, different parameters ofthe SLIM are marginally adjusted and a series of design scenarios are run inFlux2D for 8-pole and 6-pole SLIM. The comparisons between the results areconducted and the final solution is lastly chosen among them.Articulated Funiculator är ett nytt och innovativt koncept som utvecklats av Tyréns för att möjilggöra en mer effektiv vertikal transport och bättre utnyttjautrymme. Tack vare fördelar såsom en enkel konstruktion, direkt elektromagnetiskdragkraftsframdrivning, samt hög säkerhet och tillförlitlighet i motsatstill roterande induktionsmotor, är en linjär induktionsmotor (LIM) aktuell somframdrivningssystem. Detta examensarbete är utfört med syfte att utforma enLIM för att uppfylla vissa specifika krav. De detaljerade kraven inkluderar: enuppsättning identiska LIM krävs för att gemensamt producera tillräcklig dragkraftför att vertikalt höja det rörliga systemet upp till 2 m/s2; storleken påLIM får inte överstiga specifikation; den maximala flödestätheten i luftgapet förvarje LIM hålls är begränsad till knappt 0.6 T; ingen järnmättnad av någon delav LIM är tillåtet. I denna rapport ges först en introduktion av LIM-konceptet. Efter introduktionenhar relevant litteratur granskats för att stärka teoretiska grundkunskapersamt ge en bättre belysning av historiken kring LIMs samt dess applikationer. Utöver detta har en analytisk modell av den ensidiga linjära induktionsmotorn(SLIM) byggts, baserat på en ungefärlig ekvivalent krets med vilket den preliminärageometrin för SLIM. För att erhålla en mer grundläggande förståelse avmaskinens egenskaper är en tvådimensionell analys med finita elementmetoden(2D-FEM) utförd, initialt med användande av en preliminär geometri erhållenmed hjälp av analytisk dimensionering. Resultaten från dessa simuleringar visadedock att järnet mättats kraftigt i både tänderna och oket och ett överdrivetstort maximivärde av luftgapets flödestäthet erhålls. Specifikt för applikationenjusteras olika parametrar och en rad driftscenarier körs i Flux2D för en 8-poligoch en 6-polig SLIM. En slutgiltig jämförelse mellan de olika maskindesignernapresenteras och den rekommenderade lösningen väljs slutligen.
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Chow, Irene A. (Irene Ai Tze). "Testing and experimentation of an X-Y linear motor." Thesis, Massachusetts Institute of Technology, 1992. http://hdl.handle.net/1721.1/12832.
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Zemella, Ricardo J. (Ricardo Joel). "Design and development of a linear travelling wave motor." Thesis, Massachusetts Institute of Technology, 1990. http://hdl.handle.net/1721.1/42436.
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Clark, Tracy M. (Tracy Mark). "Position sensing and control of a linear synchronous motor." Thesis, Massachusetts Institute of Technology, 1995. http://hdl.handle.net/1721.1/11399.
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Gjeltema, Paul David. "The design of a closed loop linear motor system." Thesis, Massachusetts Institute of Technology, 1993. http://hdl.handle.net/1721.1/12426.
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Miranda, Breno Brito. "Contribuições ao projeto do motor linear a relutância variável." Universidade Federal de Uberlândia, 2017. https://repositorio.ufu.br/handle/123456789/19710.
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O motor linear à relutância variável (MLRV) é uma máquina elétrica alimentada em corrente contínua, com fases excitadas numa sequência determinada. Caracterizado por operar numa ampla faixa de variação de velocidade, é utilizado em aplicações lineares que convertem energia elétrica em força e movimento de translação. A necessidade de dispositivos comutadores de corrente e um sistema de controle requer boa estimativa do perfil de indutância do motor. No entanto, uma vez que o maior entreferro dificulta o cálculo analítico, este perfil deve ser obtido através de métodos numéricos. Neste contexto, este trabalho apresenta um motor linear do tipo fluxo longitudinal de 4 fases, destinado a mover um sistema de translação deslizante de abertura e fechamento. A robustez, a simplicidade de construção e a potência reduzida foram decisivos na escolha do tipo de máquina. A análise via elementos finitos (AEF) é aplicada a fim de determinar o desempenho, qualificado pela auto-indutância das bobinas de fase e pela capacidade de produção da força de propulsão. A AEF também é utilizada na avaliação do fator de ondulação da força (force ripple), altamente presente neste tipo de motor, além da produção de vibração e ruído acústico, decorrentes do mesmo.The linear variable reluctance motor (LVRM) is an electric machine fed by direct current with excited phases in a given sequence. Characterized by operating in a wide range of speed variation, it is used in linear applications that converts electric energy into force and translation movement. The need for current switching devices and a control system requires a good estimate of the motor’s inductance profile. However, since the larger air gap makes analytical calculation difficult, this profile must be obtained by numerical methods. In this context, this work presents a linear motor of the 4 phase transverse flow type designed to move a sliding translation system of opening and closing. Robustness, simplicity of construction and reduced power are decisive in the choice of machine type. The finite element analysis (FEA) is applied in order to determine the performance, qualified by the self-inductance of phase coils and the propulsion force production capacity. The FEA is also used in the evaluation of the force ripple factor, highly present in this type of motor, besides the production of vibration and acoustic noise arising from ripple factor.
Dissertação (Mestrado)
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Wang, Rong-Jie. "Analysis of a permanent magnet hybrid linear stepping motor." Master's thesis, University of Cape Town, 1998. http://hdl.handle.net/11427/26086.
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Hybrid linear stepping motors (HLSMs) are regarded as an excellent solution to positioning systems that require a high accuracy and rapid acceleration. The advantages such as high efficiency, high throughput, mechanical simplicity, high reliability, precise open-loop operation, low inertia of the system, etc. have made this kind of motor more and more attractive in such applications as factory automation, high speed positioning, computer peripherals, numerically controlled machine tools and welding apparatus. This motor drive is especially suitable for machine tools in which the positioning accuracy and repeatability are the key problems. Using the microprocessor controlled microstepping mode, a smooth operation with standard resolution of a few hundred steps/mm can be obtained. Although rotating hybrid stepping motors are well covered· by literature, there are only a few papers on HLSMs published so far. The objective of this thesis is to apply the reluctance network approach (RNA) and the finite element method (FEM) to performance calculations of HLSMs. A comparison with the experimental measurements is done to evaluate advantages and disadvantages of these two methods. The static characteristics show that the FEM demonstrates a better correlation with the experimental results than the RNA. The reason is that some assumptions have been made in order to obtain a simplified model in the RNA. The RNA, in general, tends to overestimate the forces. In the case of instantaneous characteristics simulation, both the FEM and RNA compare favourably with the experimental data though the FEM gives more accurate (albeit underestimated) results. However, the RNA is a very efficient approach considering the computation time. The optimisation of the finite element model is very important for obtaining the best possible results. The density of the finite element meshes, the aspect ratio of the elements and reducing the problem in size by using symmetry are vital considerations. The studied HLSM possesses a very small airgap, which made a judicious mesh scheme extremely important. Different methods of force calculations were analysed and it was found that both the Coulomb's approach and the Maxwell stress tensor are efficient and accurate methods to implement. The classical virtual work CVW method is very time-consuming since it requires two solutions. The determination of small incremental displacement is also difficult in the CVW. The experimental investigations of the small HLSM need a very high accuracy, Considerable efforts are needed to minimize all sources of noise and interference. It has been found that amplitude of instantaneous force ripple increases when the phase current amplitude increases. The superimposition of the 3rd harmonic on phase current can effectively reduce the force ripple. The transient tests focused on the start-up and braking characteristics. The start-up tests show that the higher the load is applied the longer the start-up time is required. On the contrary, the braking time can be significantly reduced with an increase in load. It can also be concluded that the higher the step resolution, the less settling time is needed for both start-up and braking processes. The recommendations from this thesis for further research on the subject of the HLSM analysis are that the reluctance network model should be improved to take into account the magnetic saturation and edge effects and the FEM enhanced classical approach should be attempted to take advantages of the high accuracy of the FEM without significant increase in the solution time.
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Davidson, Innocent Ewean Agbongiague. "Performance analysis for a shaded-pole linear induction motor." Doctoral thesis, University of Cape Town, 1998. http://hdl.handle.net/11427/21326.
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Bibliography: pages 129-148.The induction motor remains the prime mover of present day industry with it's associated components in drive applications. In many such applications, fractional horse-power motors find ready use in small mechanisms where three-phase power supply is not available. In Southern Africa, these motors can be used is rural areas with simple reticulation systems, hence the renewed interest in the development of these low-power electrical motors, especially specialised models such as linear versions of such motors for special applications. This research is in the area of single-phase LIMs. The objective has been to model the shaded-pole LIM, in an attempt to enhance it's performance through improved design methods. This was carried out using an integrated analysis approach, involving circuital and field theory in the analysis of the practical motor, and computer simulation of it's equivalent model using the finite element method. Linear counterparts are possible for all the various forms of rotating electrical machines. All cylindrical machines can be 'cut' along a radial plane and 'unrolled' [32]. LIMs convert electrical energy directly into mechanical energy of translatory motion. Some advantages of linear version of induction motors are: they are gearless and often require minimal material thus minimising cost. While their scope of application are somewhat limited when compared to rotary versions, they do however give excellent performance in special situations where translator motion is required. However, the output power-to-mass and output power-to-volume of active materials ratio is reduced compared to rotary induction motors[45]. These disadvantages are caused by the large air-gap and the open magnetic circuit, which produces parasitical effects.
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Nunes, Gonçalo Nuno Nascimento Ventura de Brito. "Modelação e controlo não-linear do sistema motor humano." Master's thesis, FCT - UNL, 2009. http://hdl.handle.net/10362/2667.
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Mestrado Integrado em Engenharia Electrotécnica e de ComputadoresEm diversas situações clínicas, como sejam por exemplo, traumas ao nível da espinal-medula, mielopatias degenerativas, entre outras, os doentes podem vir a manifestar a perda sensorial e do controlo da função motora. Este trabalho propõe o desenvolvimento de um modelo matemático quantitativo, para o sistema neuro-músculo-esquelético humano, em particular, para o membro superior humano incorporando algumas das suas dinâmicas, incluindo a retroacção dos proprioreceptores musculares de Golgi. Foram estudadas as suas características estáticas e dinâmicas, assim como toda a fisiologia neuromotora relacionada, tendo em vista a compreensão dos fenómenos biológicos associados à mobilidade do braço humano. O objectivo primordial deste modelo prende-se com a necessidade de desenvolver métodos práticos não invasivos que permitam o estudo deste mesmo sistema, podendo ter aplicabilidade na área da reabilitação motora. Foram estudadas técnicas de modelação biomecânica como base para a construção do modelo biomecânico. A sua robustez e fiabilidade são testadas e avaliadas tendo em vista a síntese de um modelo adequado aos objectivos propostos. Com vista a poder controlar voluntariamente o movimento de um dos membros superiores com base em trajectórias especificadas pelo ―doente‖, estuda-se a aplicação de metodologias de controlo inteligente no contexto da interface homem-máquina, que permitam o desenvolvimento de hardware protésico.
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Carvalho, Michael Sequeira. "Contributo para o estudo do motor linear síncrono supercondutor." Master's thesis, Faculdade de Ciências e Tecnologia, 2012. http://hdl.handle.net/10362/7583.
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Dissertação para obtenção do Grau de Mestre em
Engenharia Electrotécnica e de ComputadoresO aparecimento de materiais supercondutores de alta temperatura perpetuou grandes vantagens para o desenvolvimento da área de energia, em termos eléctricos e magnéticos. Com a possibilidade de arrefecê-los a uma temperatura aproximadamente igual à do azoto líquido, esta área tornou-se ainda mais atractiva para aplicações de potência, comparando com aplicações tradicionais. A hipótese de poder tornar estas aplicações mais leves, com um volume mais pequeno, assim como, terem menos perdas AC e consequentemente ter mais eficiência, foi suficiente para iniciar-se a realização de uma dissertação acerca de um motor linear síncrono totalmente supercondutor. O motor linear síncrono supercondutor é composto por enrolamentos de material supercondutor de alta temperatura (SAT) no estator e, por uma parte móvel que suporta dois blocos supercondutores magnetizados. Nesta dissertação estuda-se a aplicação de materiais SAT para efeitos de criação do campo magnético viajante para motores lineares, comparando com dois tipos de topologias distintas para o estator. Essas topologias passam pela análise do comportamento do fluxo magnético para um estator com e sem ferro, assim como, pela análise da força de propulsão para as mesmas arquitecturas. Serão apresentadas diversas simulações para estas duas topologias, demonstrando a distorção harmónica espacial para cada uma delas. Nesta dissertação foi também realizada uma análise experimental da força de propulsão com estator sem ferro, através da construção de um protótipo para este motor.
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Ren-Chih, Lin, and 林仁智. "Position Control of Linear Motor." Thesis, 1999. http://ndltd.ncl.edu.tw/handle/70970290426099890222.
Full textAbstract:
碩士元智大學
機械工程研究所
87
In recent years, the ratio by using linear motor to traditional notary motors is increasing in high technique production. For operation on line, the accuracy of position control of linear motor is very important. Before, traditional method used traditional motor to connect leadscrew to receive position. Not only its structure is very complex, but also it waste time and energy. But, the structure of linear motor is very simple, because it only has two parts, mover and stator, so it can save time and energy by using linear motor. So, more and more people research the control method of linear motor, it become new tide gradually. The purpose of this paper is to find a method to make the response of a linear stepper motor faster and more accurate on the position control. First, we derive the transfer function of a linear stepper motor by using force and circuit equations. After linearization it, we design controller by the RST control method. Then we use this controller to control a motor system. Finally, we check its practicability by using simulation on the computer. On the controller design, we use a RST controller based on the Pole-Placement method, to achieve the goal of position control on the linear stepper motor, disturbance rejection and develop its response speed. From the final simulation results, we prove this controller design acheive the desired performance and response.
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Ding, Jin-Xian, and 丁錦賢. "Servo Control of Linear Stepping Motor." Thesis, 1999. http://ndltd.ncl.edu.tw/handle/29313490512361058082.
Full textAbstract:
碩士國立交通大學
機械工程系
87
For a linear stepping motor with an air bearing, the air gap between the forcer and the stator is maintained by the pressure generated by the air bearing. As the winding current varies, the changing electromagnetic forces cause the air gap to fluctuate continuously. As a result, the parameters of the linear stepping motor also vary rapidly. In this thesis, the model of a linear stepping motor is derived by using the coenergy method. This model is further simplified and transformed to the d-q frame to facilitate controller design. Then, a nonlinear adaptive control method is developed for the control of the current, the velocity and the position of the linear stepping motor. This method guarantees the parameter estimation as well as the asymptotic convergence of the command tracking error. Experimental results aslo show that this method is very robust when the disturbance loads is present.
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Wei, ChuChi, and 魏趨吉. "The Motion Control of Linear DC Brushless Motor and Induction Motor." Thesis, 2001. http://ndltd.ncl.edu.tw/handle/03793840785698096686.
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碩士國立臺灣科技大學
機械工程系
89
This thesis uses RTW(real time workshop) in MATLAB Simulink software.The Vector control of DC brushless motor and induction motor is accomplished. MATLAB Simulink contains the advantages of rapidly designing, easily correcting,easily analyzing and friendly human-machine interface. This thesis begins with constructing the mathematical motor models and blocks of RFO Vector Control in MATLAB Simulink.The Clarke and the Park transformation are also used for the Vector Control theorem. After the simulation,this thesis continues to present the Vector Control experiments by RTW.We change the modules of the mathematical motor models into the I/O modules.The voltages are output to the driver and signals form Hall-Sensor and position encoder are feedback to interface card.Finally the real-time control is accomplished.
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Yang, Chin-Chang, and 楊志強. "Analysis of a Linear Motor Drive System." Thesis, 2003. http://ndltd.ncl.edu.tw/handle/17094439849682366204.
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碩士國立臺北科技大學
製造科技研究所
91
The purpose of this research is to study the static and dynamic characteristics of a feed drive mechanism driven by linear motor. Finite Element technique is used to find the deformation, stresses, and natural frequency of the structures. A mechanical system simulation software is also employed to simulate the motion of mechanism under different operating modes. An experimental modal analysis is performed to verify the natural frequency of the system. For the measurement and test, laser interferometer is used to measure the positioning accuracy and repeatability of the linear motor drive mechanism under different types of operating conditions. Finally the Genetic Algorithms method is performed to find out the optimal parameter value of the controller.
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Chiou-Liang, Chen, and 陳秋樑. "Development and Control of Linear Pulse Motor." Thesis, 1998. http://ndltd.ncl.edu.tw/handle/94959153477751094591.
Full textAbstract:
碩士國立臺灣科技大學
工程技術研究所
86
Nowadays, it is respectively important for the requirementof the precision because of the more and more progressive of the science and technology. In the past, we used some transf-ormation mechanisms to achieve the aim of the linear motion. Under such conditions, it was a great disadvantage of the lo-wer of efficiency. Therefore, if we can develop a linear motor to replace it, then precision and efficiency will be increased. The aim of this thesis is mainly to research the PM-type li-near pulse motor, which is of several features. For example, low velocity and high thrust force and the ability of operating in an open loop control, etc. This type of motor has been wid-ely used in OA and FA. Besides, on medicine it has been succe-ssfully used in artificial hearts, and brings people a lot of convenience. In this research, we make use of the theory of linear pulse motor, and plan the processes of designing. In addition, we test and control the linear pulse motor by using the circuit, so as to analyze it's performance characteristics.
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Chen, Gin-Chem, and 陳俊成. "A position control for linear synchronous motor." Thesis, 1997. http://ndltd.ncl.edu.tw/handle/32359421129671948584.
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Chan, I.-Pin, and 詹宜彬. "Design and manufacture of linear synchronous motor." Thesis, 1997. http://ndltd.ncl.edu.tw/handle/25117602590636651724.
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Hsu, An-Kir, and 許安克. "PC-Based Linear Motor Driver Control System." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/92491196917725001187.
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碩士崑山科技大學
電子工程研究所
100
This paper will introduce a PC-Based linear motor drive control system, because this control system has an open, scalable and low price, so the use of various industries in recent years more and more widely. This system use a set of industrial computer as the control and configure the input and output on the computer, digital/analog conversion, and movement and visual devices such as adapters to receive the return of the state by an external feedback signal, to operations ,and output signal control of linear motors to guides the machine moves. The control system can be equipped with a microscope boxes, laser, charge coupled device (CCD) camera can be taken as function to detect and repair. It can be widely used in nanoscale semiconductor and thin film transistor liquid crystal display (TFT- LCD) test equipment.
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Shiao, Kevin, and 蕭錫鴻. "Structural Design of Linear Motor Machining Centers." Thesis, 2004. http://ndltd.ncl.edu.tw/handle/03234758796999719896.
Full textAbstract:
碩士逢甲大學
材料與製造工程所
92
Abstract Recently there is an increasing interest in the development of high speed machine tools. One modern application of high speed machining is the using of linear motor system to drive a machine center and achieve high speed cutting performance. This thesis addresses an effective and efficient process of structural stiffness design and evaluation for horizontal machine centers. The process includes: 1. Divide the horizontal machine centers into X-axis, Y-axis, and Z-axis three modules. Build up 3D solid models of different modules by using of solid modeling computer software. 2. Setup evaluation factors for all modules, including: (a) the first mode natural frequency, (b) difference between the first and the second mode natural frequencies, (c) machining properties, and (d) assembling properties. 3. Give weighting values for each evaluation factor and obtain the optimized module assembly. Some other expectancy problems in high speed machine tool design are also discussed in this thesis.
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Liu, Yeun-Sheng, and 劉允升. "Modeling of a Linear Ceramic Motor System." Thesis, 1998. http://ndltd.ncl.edu.tw/handle/53943006008485238325.
Full textAbstract:
碩士中華大學
電機工程研究所
86
An electroelasticity theory consists of the dynamic equilibrium equations, the Cauchy equations, the piezoelectricity constitutive equations, and the electrostatic equations. Mathematical models are built by this theory with the Kirchhoff-Love hypothesis to describe the dynamic behavior of a ceramic motor and a friction drive system in the Cartesian coordinate system. The equivalent circuit of our ceramic motor is solved. The trajectory of spacer of the ceramic motor, related to the available driving force to move the table, is the main concern for us in the friction drive system. Both of the dynamic behavior of spacer and the resonance surves are investigated in the thesis. Then relationships among the displacements, the applied voltage, th preload force, and the drive frequency are obtained in our model. The preload force also has a significant influence on the displacement. The relationship between the available driving force and the normal force is also derived for our friction drive system.
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Weng, Jiann-Jyh, and 翁健智. "The motion control of linear induction motor." Thesis, 1999. http://ndltd.ncl.edu.tw/handle/78078614172347839725.
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碩士國立臺灣科技大學
機械工程系
87
The purpose of this thesis is to realize an entire digital PC-Based linear induction servo motor system. The PWM drive card of induction motor which is based on motor coprocessor chip-ADMC201 is designed and is used to generate pulse width modulation signal and deal with some feedback signal. The controller is a microcomputer which deals with the calculation of control laws and transmits the real-time commands to achieve the purpose of software servo control. We order the parameters tests of linear induction motor which differ from rotary one. We adopt sinusoid and voltage space vector pulse width modulation methods by voltage-fed inverter to drive motor. By the use of V/F control, we make experiments about position and velocity closed-loop on the single-sided linear induction motor to prove the hardware and control schemes are available.
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Tsung, Chang Tung, and 張永宗. "Motion Control of the Linear Motor Stage." Thesis, 1999. http://ndltd.ncl.edu.tw/handle/85540331805405343872.
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Wang, Chien-Wen, and 王建文. "Design of a Piezoelectric Linear Motor Stage." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/7n8v52.
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碩士中原大學
機械工程研究所
106
The main purpose of the thesis is to design a piezoelectric motor constructed on a short straight beam and employed on a linear guideway. How to find an effective traveling-wave mode on a finite-length short straight beam and form a piezoelectric traveling-wave motor which is integrated with a suitable guideway is the primary design target. A series of piezoelectric actuators aligned in line associated with a short beam The short-beam traveling wave motor is constructed with two sets of piezoelectric ceramic actuators separated with 1/4 wavelength in a line. The piezoelectric ceramic actuators are fabricated in whole body, which is driven by dual circuitry with same amplitude but different phase of π/4. The generated two standing waves will merge and form a travelling wave. At the end of the short beam, larger cross-section area is designed so that wave reflection is reduced and preserve effective travelling wave. The current developed short-beam piezoelectric linear motor is able to produce ideal output speed of 130mm/sec and resolution better than the target of 100nm while applying voltage of ±150V@43.7kHz. To implement and drive a general stage with friction coefficient about 0.1, the propulsion static and dynamic force are measured about 200g and the out speed is about 45mm/sec.
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Faria, Luís Carlos Pinto Palermo de. "Contribuições para o estudo do motor linear." Tese, 1985. http://hdl.handle.net/10216/12852.
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Hsu, Wei-Chung, and 許巍鐘. "Electronic cam system driven by linear motor." Thesis, 2005. http://ndltd.ncl.edu.tw/handle/98868122868394743387.
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碩士國立成功大學
製造工程研究所碩博士班
93
Electro-optical industry has been highly developed in the recent years. The equipments of electro-optical industry usually involve repetitive motion control in each motion axis. Hence, technique to improve high speed repetitive positioning control for electro-optical industry become important and urgently required by the industry. It is interesting to know that cam is widely used in equipments for repetitive motion because of it can produce various smooth motion trajectories. This thesis adopted electronic cam to create motion trajectories directly and flexibly. In case of accurate positioning motion, mechanism design, performance of controllers and development of trajectory generator are considerable. This thesis uses a direct driving linear motor platform to perform the verification and experiment convention machine tool and provide kinematic behavior. A practical repetitive controller was designed for linear motors and developed in the thesis. In addition, the trajectory generator can provide smooth functions of point-to-point command to achieve the requirements of accurate and flexible motion on manufacturing equipments.
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Hong, Jian-Yi, and 洪健益. "Linear Ultrasonic Motor Driver with Positioning Control." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/41315166066647885669.
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碩士國立東華大學
電機工程學系
97
The purpose of this thesis is to develop a dsPIC-based fuzzy neural networks driver for a linear ultrasonic motor (LUSM) which can achieve position control. The developed systems can be separated into two parts, one is the driver system, and the other is the positioning control system. As for drivers, a single-stage high-power-factor half bridge resonant inverter and a single-stage high-power-factor class E resonant inverter are developed to drive the LUSM. The single-stage half bridge resonant one is originated from a buck-boost converter integrated with a half bridge resonant inverter. With asymmetrical pulse-width-modulation (APWM), the output voltage can be effectively regulated. The single-stage class E resonant driver is integration of a buck-boost converter and class E resonant inverter. For both of the drivers, the power switches exhibit either zero-voltage-switching (ZVS) or zero-current-switching (ZCS) over the operating range to enhance the circuit efficiency. The buck-boost converter is operated at discontinuous conduction mode (DCM) to provide nearly unity power factor at a fixed frequency. Since the exact mathematical model of LUSM is not easy to figure out. A fuzzy neural network (FNN) controller is developed in this thesis to regulate the single-axis platform. With the proposed intelligent controllers, the position response of the mover of the single-axis platform possesses the advantages of good transient control performance and robustness to uncertainties for the tracking of periodic reference trajectories. Finally, the effectiveness of the proposed control schemes is verified by some experimental results.
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Chang, Fu-Chun, and 張富鈞. "Development of the Linear Motor Drive System." Thesis, 2001. http://ndltd.ncl.edu.tw/handle/78524588970741920387.
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碩士逢甲大學
自動控制工程學系
89
Linear motors give mechanical devices high dynamic speeds and accelerations, high accuracy position and exceptionally smooth motion in linear motion driving application. But the design and driving skills are not as popular as that for traditional rotary motors. With the development of the microcomputer and power electrical industry, the design of the linear motor driver and controller system is still some key issues being worthy of further improvement. The purpose of this paper is to implement a linear brushless DC motor (LBDCM) driving system, including drive circuits and controller. First, we established a single axis position stage. Then a current-controlled voltage source PWM inverter,including a current-controlled PWM signal generating circuit and a lock-out circuit is properly designed. In order to obtain the information of moving member position, a linear encoder and Hall-effect sensor signals are employed. Finally, the current command is kept in synchronization with the back electromotive forces. In this way, the correct current command is generated to make the primary moving magnetic field in perpendicular to the secondary flux and produce the maximum force. In this paper, the practical realization of a sliding mode controller based on variable structure systems is applied. The dynamic modeling of the LBDCM system is obtained by estimation from measurement. When the sliding mode occurs, the system will be forced to slide along or near the vicinity of the switching surface. The system became robust and insensitive to the disturbances and variations during the task. Simulation and experimental results demonstrate that the control method has more robust and the valid than a PID control.
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Chiou, Shean Ling, and 邱顯霖. "Analysis and Design of Linear Synchronous Motor." Thesis, 1994. http://ndltd.ncl.edu.tw/handle/49522177594678327060.
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Faria, Luís Carlos Pinto Palermo de. "Contribuições para o estudo do motor linear." Doctoral thesis, 1985. http://hdl.handle.net/10216/12852.
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ming-ho, TU, and 凃銘河. "The Design of Robust Controller for Linear Motor." Thesis, 2005. http://ndltd.ncl.edu.tw/handle/10427569365958035166.
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碩士大葉大學
電機工程學系碩士在職專班
93
The characters of linear motor were superior to rotary motor in the application of linear motion, such as direct power transmission, high precision positioning, quick response. Though, the development of linear motor is fall behind with rotary motor. But, in the driving and controlling of linear motor are similar to rotary motor. So, we can apply the variable kinds of rotary motor control theory which has been developed many years. Therefore, linear motor can develop rapidly and apply extensively. The study mainly is based on the concept of rotary motor, to introduce the proposed modern robust control methods, such as the application of variable structure control, model reference adaptive control and zeroing with an equivalent disturbance observer. At last, design the controller by using the PID control and deadbeat control, and using MATLAB/SimuLink execute simulate and analysis. Deadbeat control is one of the earliest digital control algorithms. It is designed by deadbeat algorithm that is according to the desirable closed-loop response. The basic idea of this controller is that the process response should reach a desirable set-point value in a minimal number of sampling steps.
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莊福祿. "Position Control for Single-Sided Linear Induction Motor." Thesis, 2003. http://ndltd.ncl.edu.tw/handle/90920930579080070995.
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碩士國立中興大學
電機工程學系
91
This thesis develops methodologies for positioning of a single-sided induction motor (SLIM). Although the PID controller have been extensively used in industry. Such a controller would not given good tracking performance, when the transfer functions or the parameters of plants vary with time, or unpredictable disturbances occur. To deal with these shortcomings, we propose a new type of control structure, which combines a simple recurrent neural-networks identifier (SRNNI), and a simple recurrent neural-networks compensator (SRNNC). The SRNNI and SRNNC make use of the dynamic back-propagation (DBP) method for updating their weightings and ensure that the output of the plant is able to follow the desired output generated by a reference model. Computer simulation results have used to verify the effectiveness and feasibility of the proposed control method. Through experimental results, the proposed positioning control for the SLIM has been show to outperform the traditional PID control, and to given an excellent control efforts.
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yang, po-shen, and 楊博森. "Modeling and Control Simulation of a Linear Motor." Thesis, 2000. http://ndltd.ncl.edu.tw/handle/27116464693210759403.
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碩士逢甲大學
自動控制工程學系
88
Compared with rotary motor, linear motors possess many advantages in linear motion driving application, such as direct driving , high speed, high position control accuracy, low frictional loss. But linear motors designs, driving controls are still not as mature as those for rotary motors, so many control laws are still under developed . In this thesis , we use sliding mode controller which can provide features such as fast response, insensitivity to variation in plant parameters and high precision . By simulation result , we can prove the controller used in this thesis possess the features of fast response and robustness.
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Liu, Wei-Kuo, and 劉偉國. "Nonlinear Control for Linear Induction Motor Drive System." Thesis, 2001. http://ndltd.ncl.edu.tw/handle/74455839173408915402.
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碩士元智大學
電機工程研究所
89
Abstract The purpose of this thesis is to develop a sliding-mode feedback linearization control (SMFLC) system and an adaptive optimal control(AOC) system for the high-precision position control of a linear induction motor (LIM). First, the driving cricuit of the LIM is developed and the nonlinear decoupled control technique is adopted to decouple the thrust force and the flux amplitude of the LIM. Then, a SMFLC system, which is comprised of a sliding-mode flux and a sliding-mode position controllers, is designed in order to increase the robustness of LIM drive system. Moreover, to relax the requirement of the secondary flux in the SMFLC system, an adaptive flux observer is proposed to estimate the secondary flux. The control laws of the SMFLC system are derived in the sense of Lyapunov stability theorem such that the asymptotically stability of the control system can be guaranteed even under the possible occurrence of uncertainties. In addition, an AOC system is designed to increase the system control performance. In the AOC system, an adaptive uncertainty observer is used to estimate the bound of uncertainties for confronting the shortcoming in the traditional optimal control system. The control laws of the AOC system also are derived in the sense of Lyapunov stability theorem, so that system-tracking stability can be guaranteed. Finally, the effectiveness of the proposed control schemes is verified by both numerical simulation and experimental results.