In any analysis of innovation, 802.11 is truly a prime number. This evolving standard, better known as Wi-Fi, is the it protocol that s won the same spectacular hype as (whisper it softly) the Internet itself. Oh, the good old days. I miss them.

But while Wi-Fi undeniably inspires that intoxicating blend of expectation and excitement that leads to entrepreneurial excess, it s also the kind of technological platform that invites the best ideas. Wi-Fi s combination of well-crafted technical standard and regulation-free deployment offers a ....etc

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chopper fed dc motor drive



INTRODUCTION

Development of high performance motor drives are very essential for industrial applications. A high performance motor drive system must have good dynamic speed command tracking and load regulating response. DC motors provide excellent control of speed for acceleration and deceleration. The power supply of a DC motor connects directly to the field of the motor which allows for precise voltage control, and is neces ....etc

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FOUR-QUADRANT CHOPPER DRIVE FOR UNIVERSAL DC MOTOR

#G-5, Ratna Complex, Ameerpet,
#310, OPP. Kalaniketan, Dilshukh Nagar


AIM:
The main aim of the project is to develop a speed control system for DC motor using four-quadrant chopper. Using four-quadrant chopper it is possible to demonstrate forward &reverse motoring and braking.
PURPOSE:
The purpose of the project is to implement a simple and cost effective process to control the speed of DC motors using the most popular technique four-quadrant ....etc

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Knock is the result of the rapid combustion of the end-gas ahead of the flame front which undergoes chemical reactions prior to normal combustion. This cause high frequency pressure oscillations inside the cylinder that produce the sharp metallic noise called knock.

Two theories have been postulated to explain the origin of knock :

1. The autoignition theory which states that when the air/fuel mixture in the end- gas region is compressed to sufficiently high pressure and temperature the fuel oxidation process - starting with the preflame chem ....etc

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cud u pls mail me schematic of speed control of dc motor using chopper ....etc

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To get full information or details of speed control of chopper fed dc motor please have a look on the pages

http://seminarsprojects.net/Thread-chopper-fed-dc-motor-drive

http://seminarsprojects.net/Thread-h-bridge-fed-dc-motor-speed-control-full-report

if you again feel trouble on speed control of chopper fed dc motor please reply in that page and ask specific fields in speed control of chopper fed dc motor ....etc

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to get information about the topic speed control of dc motor full report ppt and related topic refer the page link bellow

http://seminarsprojects.net/Thread-speed-control-of-dc-motor-using-pwm-technique

http://seminarsprojects.net/Thread-dc-motor-speed-control-using-bluetooth

http://seminarsprojects.net/Thread-speed-control-of-dc-motor-by-using-pid

http://seminarsprojects.net/Thread-speed-control-of-dc-motor-using-pulse-width-modulation

http://seminarsprojects.net/Thread-pwm-based-speed-control-of-dc-motor-using-8052-controller

http://s ....etc

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difference between chopper fed drives and converter fed drives pdf

If the source of supply is d.c. (for example in a battery vehicle or a rapid transit system) a chopper-type converter is usually employed. The basic operation of a single-switch chopper was discussed in topic 2, where it was shown that the average output voltage could be varied by periodically switching the battery voltage on and of for varying intervals. The principal difference between the thyristor-controlled rectifier and the chopper is that in the former the motor current ....etc

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thnk you so much.,i am very thank ful to you.hope u continue ur hlp in future time ....etc

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2.1 INTRODUCTION
Direct-current motors are extensively used in variable-speed drives and positioncontrol
systems where good dynamic response and steady-state performance are
required. Examples are in robotic drives, printers, machine tools, process rolling mills,
paper and textile industries, and many others. Control of a dc motor, especially of the
separately excited type, is very straightforward, mainly because of the incorporation of
the commutator within the motor. The commutator brush allows the motor-devel ....etc

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