DC Motor Drive Basics - Part 4: Chopper-fed dc motor drives Austin Hughes 11/11/2008 2:51 PM EST [Part 1 begins with an overview of the operation of thyristor-fed DC motor drives. Part 2 continues with a look at converter output impedance‚ four-quadrant operation‚ single- and double-converter reversing drives and power factor and supply effects. Part 3 examines the operation of a standard dc drive system with speed and current control.] CHOPPER-FED D.C. MOTOR DRIVES If the source of supply
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Zhang with Susan Finger Stephannie Behrens Table of Contents 1 Physical Principles This chapter introduces the basic physical principles behind mechanisms as well as basic concepts and principles required for this course. 1.1 Force and Torque 1.1.1 Force Force: an agent or influence that‚ if applied to a free body results chiefly in an acceleration of the body and sometimes in elastic deformation and other effects. Every day we deal with forces of one kind or another. A pressure
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> upthrust A ruler of length 0.30 m is pivoted at its centre. Equal and opposite forces of magnitude 2.0 N are applied to the ends of the ruler‚ creating a couple as shown. 2.0 N 50° ruler pivot 50° 2.0 N What is the magnitude of the torque of the couple on the ruler when it is in the position shown? A 0.23 Nm B 0.39 Nm C 0.46 Nm D 0.60 Nm Compiled nd rearrnged by Sjit Chandra Shakya 3 weight < drag 2 4 A ball falls from rest through air and eventually
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Systems‚ Man‚ and Cybernetics‚No.3‚ PP.28-44‚1973. [2] N.T. M. Mohan Undeland and W.P.Robbins‚ "Power Electronics Converter‚ Applications and Design" john Wiley & Sons Inc. Canada‚ 1989. [3] L. Tang‚ M. F. Rahman‚ “A new direct torque control strategy for flux and torque ripple reduction for induction motors drive – a Matlab/Simulink model‚” IEEE International Electric Machine and Drives Conference‚2001‚pp.884-890. [4] Bimal K. Bose‚Modern Power Electronics and AC Drives‚ Prentice Hall‚ 2002. [5]
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DEPARTMENT OF MECHANICAL ENGINEERING COLLEGE OF ENGINEERING UNIVERSITY TENAGA NASIONAL Mechanics and Materials Lab Manual MEMB221 Semester 2 2014/2015 TABLE OF CONTENTS ITEMS PAGES Laboratory & Reports: An Overview 3 Guidelines for Informal Laboratory Report 4 Guidelines for Formal Laboratory Report 6 Basic Laboratory Safety Rules 8 Experiment 1 Tensile Test 9 Experiment 2 Torsion Test 14 Experiment 3 Bending Test 20 Experiment 4 Buckling Test 23 Experiment 5 Hardness Test
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the WRX STi and Evo are both great buys. They are both great cars because they produce a lot of power and torque‚ drivability of each car is very easy‚ and they both look good inside and out. First‚ the STi comes with a horizontally opposed‚ EJ20 engine that puts out an impressive 300 hp and 300 lb-ft of torque. While on the other hand‚ the Evo comes with 271 hp and 273 lb-ft of torque. So‚ right off the bat both cars are going to get you from point A to point B much a lot quicker. With all
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SCREWS Anjori Grover Vasesi ------------------------------------------------- SCREWS ------------------------------------------------- Introduction A screw‚ or bolt‚ is a type of fastener characterized by a helical ridge‚ known as an external thread or just thread‚ wrapped around a cylinder. Some screw threads are designed to mate with a complementary thread‚ known as an internal thread‚ often in the form of a nut or an object that has the internal thread formed into it. Other screw threads are
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ELECTRIC POWER UTILISATION AND ENERGY AUDITING UNIT – I ILLUMINATION‚ HEATING AND WELDING Nature-of radiation –definition – laws photometry – polar curves – lighting calculationsdesign of illumination systems (for residential‚ industrial‚ commercial and street lightings) - types of lamps-energy efficiency lamps. Methods of heating requirement of heating material-design of heating element-furnaces – Welding generator-welding transformer and its characteristics UNIT - II ELECTRIC TRACTION
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A direct current (DC) motor is a fairly simple electric motor that uses electricity and amagnetic field to produce torque‚ which turns the motor. At its most simple‚ a DC motorrequires two magnets of opposite polarity and an electric coil‚ which acts as an electromagnet. The repellent and attractive electromagnetic forces of the magnets provide the torque that causes the DC motor to turn. If you’ve ever played with magnets‚ you know that they are polarized‚ with a positive and a negative side. The
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Seatwork 1. An aluminum tube is rigidly fastened between a bronze and steel rod as shown. Axial loads are applied at the position indicated. Determine the stress in each material. 2. Two bars are equal length but different materials are suspended from a common support‚ bar A supports 200lbs and bar B supports 2000lbs‚ if the cross sectional area of bar A is 0.00015ft2 and bar B is 0.015ft2‚ compare the strength of bar A and bar B in psi. Assignment 1. A timber shown in figure with
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