28 research outputs found
Model engine data sheets and operating instructions, T - Misc, 1980, 1982, 1983, 2003
No full textMRC-Webra engine parts list for Webra Speed model engines and operating instructions for the Webra Speed 40 R/C model engine
Model engine data sheets and operating instructions, T - Misc, 1980, 1982, 1983, 2003
No full textEngine parts list for MRC-Webra model engines
Recommended from our members
Model engine data sheets and operating instructions, T - Misc, 1980, 1982, 1983, 2003
No full textMRC-Webra engine parts list for Webra Speed model engines and operating instructions for the Webra Speed 40 R/C model engine
Recommended from our members
Model engine data sheets and operating instructions, T - Misc, 1980, 1982, 1983, 2003
No full textEngine parts list for MRC-Webra model engines
Recommended from our members
Model engine data sheets and operating instructions, T - Misc, 1980, 1982, 1983, 2003
No full textSafety instructions and warnings for MRC model engine
Model engine data sheets and operating instructions, T - Misc, 1980, 1982, 1983, 2003
No full textSafety instructions and warnings for MRC model engine
Platform for ergonomic steering methods nvestigation of quot Segway-style quot balancing scooters
No full textSegway has been a popular production as an alternative transporter since its invention at the end of 20th century. Millions of people like for its ergonomic design and high-tech elements. It is predicted to be an innovational product to change a person's life style.
This thesis focuses on building a simple low cost, home-made Segway style scooter. This project uses two electric scooter motors, two 12V car batteries, one accelerometer and several microprocessors to build up the whole system.
Significantly, this project also explains how to build a Brushed Direct Current (BDC) motor driver with a rated output power of more than 350W and the capability of coping with up to 120A transient peak current and up to 40A continuous current. Four-quadrant operation and eight modes of DC motor operation are discussed.
A mathematical model of the Segway style scooter is also introduced in details. This including the modelling of a BDC motor, a two-wheeled inverted pendulum and their combination. The linearization of these models is used. At the end the linearized model is simulated in computer software
Família de retificadores PWM unidirecionais três-níveis híbridos a capacitor chaveado com elevado fator de potência
Get PDFTese (doutorado) - Universidade Federal de Santa Catarina, Centro Tecnológico, Programa de Pós-Graduação em Engenharia Elétrica, Florianópolis, 2015.Esta tese de doutorado tem por objetivo a proposta de uma nova família de conversores ca-cc três níveis unidirecionais híbridos a capacitor chaveado. São propostos conversores monofásicos e trifásicos. As características principais dos conversores são o fornecimento de alto fator de potência e elevado ganho de tensão sem o uso de transformadores. Para isso, unem dois conceitos distintos dentro da eletrônica de potência moderna que são: o controle de corrente por armazenamento indutivo e a elevação de tensão por comutação capacitiva. Os conversores apresentam baixos esforços de tensão, reduzido número de semicondutores comandados e baixa distorção harmônica na corrente de entrada. É proposta uma especificação de projeto com potência de saída de 2500 W para os conversores monofásicos e de 7500 W para os retificadores trifásicos, alimentados com tensão de entrada ca de 220 V e tensão de saída cc de 1600 V. O estudo é conduzido de forma a propiciar o entendimento, projeto e dimensionamento dos elementos do sistema. São apresentados estudos teóricos, simulações, além de resultados experimentais.Abstract : This thesis aims studies of a new family of ac-dc three-level hybrid switched-capacitor converters. Are proposed both single-phase as well as three-phase converters. The main features of the proposed converters are high power factor correction and high voltage gain operation without isolation transformers. These converters merge two different concepts in modern power electronics, that are: current control by inductive storing energy and increased of the output voltage by capacitive commutation. The converters have low voltage stress, reduced number of switches and low harmonic distortion in the input current. Experimental and simulation results for a 2500 W, single-phase converters, and 7500 W, three-phase converters, laboratory prototype are shown. Both converters work with input voltage of 220 Vac and output voltage of 1600 Vdc. This Thesis is focused to theoretical understanding and design of all elements of the system
Fast charging techniques and compact integrated implementations for electrochemical double layer capacitors in portable applications
No full textThe widespread increase in the range and types of portable electronic devices in the past decades has resulted in higher requirements for energy storage and conversion modules. Most of these devices use rechargeable batteries as energy storage elements. No matter what type of batteries are used (Ni-Cd, Ni-MH, Li-Ion, etc.) they all have one serious drawback in common, in terms of charging time. Electrochemical double layer capacitors (EDLCs) also known as ultracapacitors or supercapacitors seem to have overcome this disadvantage, at the cost of lower energy storage capacity.This work aims to explore the design of fast and compact integrated charging techniques for ultracapacitors using the AC mains network as the source. The main constraints that arise are the power dissipation on-chip and in the magnetic components due to the large amount of energy that has to be transferred in a very short time interval. Two other limitations come from the EDLC side due to the device parasitics and the widely varying voltages over the operational envelope. This will impose the need for a flexible control system providing high efficiency over the whole output voltage range.The structure of this thesis comprises five main parts: literature review, behavioural modelling of the control system (including matlab simulations); implementation of the device with discrete components; design of an analogue circuit implementation and design of a mixed signal circuit implementation. As ultracapacitors represent one of the newest solutions in the field of electrical energy storage there are very few designs for chargers from the mains network. Therefore the literature review will also examine the properties and the modelling of EDLCs, as well as the choice of converter topologies available and the characteristics of the magnetic devices required for the system. The behavioural model of the control module gives a preview of the system parameters, while the design chapter introduces a series of new control techniques. The simulations and measurements of the breadboard circuit come as a first confirmation of the design approach and make it a viable starting point for an IC implementation. The analogue IC design presents the integration of the algorithms in a medium-voltage process using the current mode approach, as a demonstrator for a fully monolithic high-voltage IC. Once the functionality of the system is demonstrated at IC level, the mixed-signal system aims to optimize the device and provide a broader flexibility for the system parameters and control algorithms
