Gnit Workshop.

8/3/2019 Gnit Workshop.

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2012

COMPILED AND

EDITTED BY

ARIJIT PAL

SUMIT DAS

&

SANHATI

CHAUDHURI.

PWMB

ASEDSPEE

DCONTROL

OFDCMO

TOR..


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DATE PROGRESS OF WORKING:-

5.01.2

012

INAGURATION OF WORKSHOP WITH SPEECH FROM RESPECTED

DEAN SIR AND H.O.D. MAM.(11:15-12:00)

TEA BREAK(12:00-1:00)

FAMILIARISATION WITH COMPONENTS(1:00-1:30)

LUNCH BREAK(1:30-2:30)

PROSECUTION OF PROJECT BY EACH GROUP ON BREAD

BOARD(2:30-5:30)

6.01.2

012

DRAWING AN END TO PROJECTS 1ST PART BY IMPLEMENTING ON

BREAD BOARD.(11:15-1:00)


IMPLEMENTATION OF THE SAME ON VERO BOARD(2:30-5:00)

9.01.2

012

IMPLEMENTING THE REMAINING PART OF PROJECT ON VERO-

BOARD(11:15-1:00)


CALIBRATION AND MEASUREMENT(2:30-4:00)


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TABLE OF CONTENTSTABLE OF CONTENTS:-


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TITLE OF THE EXPERIMENT:-

PWM BASED SPEED CONTROL OF DC

MOTOR

OBJECTIVE:-OBJECTIVE:- To control the speed of DCmotorTo control the speed of DCmotor

basbased on Pulse Width ModuLation (PWM).

COMPONENTS REQUIRED:-COMPONENTS REQUIRED:-

Sl.noSl.no Apparatus RequiredApparatus Required qntyqnty specificatonspecificaton

1 MotorMotor 11 DC[2400]CW,6VDC[2400]CW,6V

2 DiodeDiode 11 ININ 4007

3 TransisitorTransisitor 11 npn-CL-100npn-CL-100

4 ResistanceResistance 44 RR3=1K,R=1K,R4=470,=470,

RR2=10,R=10,R

1=4.7k=4.7k

5 CapacitanceCapacitance 22 CC1==0.1F=C22

6 Ceramic capacitorCeramic capacitor 11 C=0.1FC=0.1F


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7 PotentiometerPotentiometer 11 10K SATO B10K SATO B

8 TimerTimer 22 LM555LM555

THEORY:-A DC motor is an electric motorthat runs on direct current(DC) electricity.DC motors were used to run machinery, often eliminating the need for a local steam engine

or internal combustion engine. DC motors can operate directly from rechargeable batteries,

providing the motive power for the first electric vehicles. Today DC motors are still found in

applications as small as toys and disk drives, or in large sizes to operate steel rolling mills

and paper machines. Modern DC motors are nearly always operated in conjunction with

power electronic devices. There are three types of connections used for DC electric motors:

series, shunt and compound. These types of connections configure how the motor's field

and armature windings are connected together. The type of connection is significantbecause it determines the characteristics of the motor and is selected for speed/torque

requirements of the load.The aim of development of this project is towards providing

efficient and simple method for control speed ofDC motor using pulse

widthmodulation technique.The modulation ofpulse width is obtained using dual

timer IC - NE556.

There are several methods for controlling the speed ofDC motors. One simple method

is to add series resistance using a rheostat. As considerable power is consumed in the

rheostat, this method is not economical. Another method is to use a series switch that

can be closed or opened rapidly. This type of control is termed as chopper control. The

PWM based chopper circuit smoothly controls the speed of general purpose DC motors.

To get desired modulation of pulse width as output, we have fabricated astablemultivibrator and monostable multivibrator circuit using single dual timer IC NE 556.

The width of the pulse is changed by varying the control voltage of the monostable

circuit.
http://en.wikipedia.org/wiki/Electric_motorhttp://en.wikipedia.org/wiki/Direct_currenthttp://en.wikipedia.org/wiki/Electric_motorhttp://en.wikipedia.org/wiki/Direct_current

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