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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

Design av effektelektronikkort till NI ELVIS II

Kim, Persson January 2015 (has links)
Det här arbetet handlar om designa ett effektelektronikkort till National Instruments utvecklingsplattform ELVIS II, som skakunna styras från programmet LabVIEW. Kortet är tänkt att kunna användas i kurser inom effektelektronik på högskolenivåoch har designats för att passa ELVIS II's hårdvaruspecifikationer. I arbetet har alla kretsar byggts upp och simulerats iMultisim. Kretsarna som designats är en step-up-konverterare, en step-down-konverterare, en likriktare, en växelriktare ochen variabel last. Simuleringarna visade att kretsarna fungerar som tänkt och vad som skiljer sig från det teoretiska. Någotsom ofta visade sig i simuleringarna var att strömförbrukningen under korta perioder kraftigt kan överstiga det ELVIS II kanleverera, vilket behöver undersökas närmare. Rapporten innehåller scheman och simuleringsresultat från alla kretsar, vadsom är kvar att lösa på dessa och hur dessa kan anslutas till ELVIS II.
2

Využití programu NI Multisim ve výuce / Use of NI Multisim program in teaching

BOHÁČ, Zdeněk January 2013 (has links)
Thesis is amed on the usage of the simulation software NI Multisim Education in education on elementary and secondary school. The output of this work is many problems of chosen analog and digital technique tasks and then subsequently verification of elaborated tasks in lessons. Another part of work is user manual for simulating software MI Multisim Education. Possibilities and requirement of using simulation software in education on elementary and secondary school is investigated, so well as problems which is brought by using software on standard school. Part of the work is comparison of avaiable solutions and recommend witch software choose.
3

Estudo de um circuito de Chua com realimentação tipo seno / Study of Chua s circuit with feedback sinusoidal

Prebianca, Flavio 04 December 2014 (has links)
Made available in DSpace on 2016-12-12T20:15:51Z (GMT). No. of bitstreams: 1 FlavioPrebianca.pdf: 9416283 bytes, checksum: 8370dafefe8b91b42b5d6117aaae5da3 (MD5) Previous issue date: 2014-12-04 / Coordenação de Aperfeiçoamento de Pessoal de Nível Superior / The Chua s circuit is an electronic oscillator that has a non-linearity coupled to an LC oscillator, enabling the study of experimental chaos. Using the method of feedback with sine function of the voltage from C1 capacitor, indirectly alters the nonlinear curve of the circuit, with new operation points allowing the emergence of four scroll attractors. A consequence of this feedback is the emergence of a new chaotic region in the parameter space. We present here a qualitative numerical study simulated via MULTISIM/SPICE. It also presents the study by fourth order Runge-Kutta numerical integration for the construction of the parameter space of the largest Lyapunov exponent and bifurcation diagram. It explores the crisis region in the numerical study and show the experimental attractors in this phenomenon. We seek to compare the crisis phenomenon relating the number of visits that system is in the regions +V1 and −V1. / O circuito de Chua é um oscilador eletrônico que possui uma não-linearidade acoplada a um oscilador LC, viabilizando o estudo de caos experimental. Utilizando o método de realimentação por função senoidal da tensão do capacitor C1, altera-se indiretamente a curva não linear do circuito, com novos pontos de operação do oscilador, possibilitando o surgimento de atratores de quatro rolos. Uma consequência desta realimentação ´e o surgimento de uma nova região de caos no espaço de parâmetros. Apresenta-se neste trabalho, o estudo numérico qualitativo simulado via MULTISIM/SPICE. Também apresenta o estudo por integração numérica pelo método Runge-Kutta de quarta ordem, para a construção do espaço de parâmetros do maior expoente de Lyapunov e diagrama de bifurcação. Explora-se a região de crise no estudo numérico e mostra-se atratores experimentais em tal fenômeno. Buscamos comparar o fenômeno de crise relacionando o numero de visitas que o atrator faz nas regiões +V1 e −V1.
4

Řízení BLDC motoru pomocí LabView FPGA / BLDC motor control using LabView FPGA

Ruhás, Sándor January 2018 (has links)
This thesis focuses on BLDC motor control algorithms with model based design approach. Models and control algorithms were programmed in LabView, the NI MyRIO was used as a hardware platform. For hall-sensor feedback controlled application an already finished power inverter was used from a Honeywell rotary actuator. For sensor-less motor control an indirect sensing of BEMF signal is applied using motor phase current measurement. The time-critical parts of the algorithms are programmed for FPGA, the non-time-critical parts are programmed for LabView Real-Time module.
5

Sensorfinger / Sensorfinger

Silvén, Daniel, Karlssson, Patrik January 2009 (has links)
Målet med detta examensarbete är att ersätta den tidigare lösningen av sensorfingret med andra komponenter, eller hitta en annan sensor med motsvarande funktion. Arbetet har begränsats av att ESAB vill ha ett mekaniskt finger för användarvänlighetens skull. Efter en förundersökning av olika typer av sensorer har vi valt att använda oss av trådtöjningsgivare som sensorer till det mekaniska sensorfingret. I och med detta val behövde vi även komma med ett teoretiskt förslag på en mekanisk upphängning av sensorfingret. Vi har byggt upp två separata Wheatstonebryggor med varsin instrumentförstärkare (INA125). Utsignalen från bryggorna är relativt liten och behövde förstärkas cirka 2000 gånger. Nollbalansering av bryggorna har skett manuellt med potentiometrar men vi har även gett ett förslag på en lösning där nollbalansering kan ske med ett enkelt knapptryck. Knappen är placerad på upphängningen på ett sådant sätt att man inte kan trycka oavsiktligt på knappen. Resultatet av arbetet är en uppkoppling på en experimentplatta samt förslag på hur upphängningen och sensorfingret designmässigt kan se ut. För vidare arbetsgång behövs en prototyp för att testa livslängden och ta reda på vilken känslighet som är mest optimal. / The goal with this degree project was to find a solution with different components to the existing design, or find a sensor with similar function that could replace the previous design of the sensor finger. Our work has been limited by ESAB due to the user friendly mechanical design of the previous sensor finger. After examining different sensors we choose to use strain gages as sensors for the mechanical sensor finger. With this choice we also needed to suggest a theoretical design for a mechanical attachment of the sensor finger. We have designed two separate Wheatstone bridges with separate instrumental amplifiers (INA125). The output signals from the bridges are relatively small and need to be amplified around 2000 times. The zero balancing of the bridges has been done manually with potentiometers but we have also suggested a solution where the zero balancing can be performed by a push-button. The button is placed where you cannot push it unintentionally. The result of this degree project is a circuit on a veroboard, a designing proposal for the attachment and the sensor finger. In order to further develop this design it would be necessary to build a prototype to evaluate its life span and find the optimal sensitivity.
6

Sensorfinger / Sensorfinger

Silvén, Daniel, Karlssson, Patrik January 2009 (has links)
<p>Målet med detta examensarbete är att ersätta den tidigare lösningen av sensorfingret med andra komponenter, eller hitta en annan sensor med motsvarande funktion.</p><p>Arbetet har begränsats av att ESAB vill ha ett mekaniskt finger för användarvänlighetens skull. Efter en förundersökning av olika typer av sensorer har vi valt att använda oss av trådtöjningsgivare som sensorer till det mekaniska sensorfingret. I och med detta val behövde vi även komma med ett teoretiskt förslag på en mekanisk upphängning av sensorfingret.</p><p>Vi har byggt upp två separata Wheatstonebryggor med varsin instrumentförstärkare (INA125). Utsignalen från bryggorna är relativt liten och behövde förstärkas cirka 2000 gånger.</p><p>Nollbalansering av bryggorna har skett manuellt med potentiometrar men vi har även gett ett förslag på en lösning där nollbalansering kan ske med ett enkelt knapptryck. Knappen är placerad på upphängningen på ett sådant sätt att man inte kan trycka oavsiktligt på knappen.</p><p>Resultatet av arbetet är en uppkoppling på en experimentplatta samt förslag på hur upphängningen och sensorfingret designmässigt kan se ut.</p><p>För vidare arbetsgång behövs en prototyp för att testa livslängden och ta reda på vilken känslighet som är mest optimal.</p> / <p>The goal with this degree project was to find a solution with different components to the existing design, or find a sensor with similar function that could replace the previous design of the sensor finger.</p><p>Our work has been limited by ESAB due to the user friendly mechanical design of the previous sensor finger. After examining different sensors we choose to use strain gages as sensors for the mechanical sensor finger. With this choice we also needed to suggest a theoretical design for a mechanical attachment of the sensor finger.</p><p>We have designed two separate Wheatstone bridges with separate instrumental amplifiers (INA125). The output signals from the bridges are relatively small and need to be amplified around 2000 times.</p><p>The zero balancing of the bridges has been done manually with potentiometers but we have also suggested a solution where the zero balancing can be performed by a push-button. The button is placed where you cannot push it unintentionally.</p><p>The result of this degree project is a circuit on a veroboard, a designing proposal for the attachment and the sensor finger.</p><p>In order to further develop this design it would be necessary to build a prototype to evaluate its life span and find the optimal sensitivity.</p>
7

Design of a high gain filter system for Marker Locator

Zhang, Han January 2015 (has links)
This paper introduces a high-gain, low-noise band-pass filter system for detection/amplification of small signals. In addition, related theory and methodology are described for a specific design implementation. Simulation and experimental results are presented and discussed. The purpose of the implemented design was to construct a band-pass filter system with 102 dB gain and with an output noise level of less than 0.8V. The design of the high-gain band-pass filter system was achieved mainly with the help of Filter Pro, LTSpice IV, and Multisim 12. The thesis provides important support for the project Marker Locator and constitutes a valuable reference for future active filter system design and small signal detection/amplification. / Marker Locator
8

Soubor úloh pro laboratorní cvičení oboru Elektrotechnika na střední odborné škole / A Set of Tasks for Laboratory Exercises for Specialization in Electrotechnics at Vocational School

HOSPODÁŘSKÝ, Miroslav Václav January 2017 (has links)
This diploma thesis is focused on use of measuring interface myDAQ by National Instruments company in teaching of electrotechnical measurement at vocational school. The aim of this work is the design of set of suitable measuring tasks covering the curriculum in electrotechnical measurements for the 3rd and 4th class of study branch of 26 41 M/01 Electrotechnics. Description of the properties of the measuring interface myDAQ and the respective utility programme National Instruments Multisim is a part of this work. The practical part contains technological and photographic documentation of the various products that can be connected to the interface myDAQ. This thesis is built on the author's bachelor thesis.

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