246.Two Quadrant Chopper Drive for the Dc Motor Speed Control

7/27/2019 246.Two Quadrant Chopper Drive for the Dc Motor Speed Control

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CONTACT: +91-- 9491535690, +91-- 7842358459


CONTACT: +91-- 9491535690, +91-- 7842358459

TWO QUADRANT CHOPPER DRIVE FOR THE DC

MOTOR SPEED CONTROL




CONTACT: +91-- 9491535690, +91-- 7842358459


CONTACT: +91-- 9491535690, +91-- 7842358459

AIM:

The main aim of the project is to develop a speed control system for DC motor using two-

quadrant chopper. Using two-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 two-quadrant chopper method.

METHODOLOGY:

BLOCK DIAGRAM:

Microcontroller

KEY PAD

MOTOR

Power

supply

IGBT Chopper

IGBT

Driver

circuit

LCD DISPLAY

Rectifier

1-p AC




CONTACT: +91-- 9491535690, +91-- 7842358459


CONTACT: +91-- 9491535690, +91-- 7842358459

POWER SUPPLY:

DESCRIPTION:

In this project armature is excited by a variable dc supply obtained from two-quadrant

chopper. The system is provided with various control keys, such as START, STOP, REVERSE,

FORWARD and REVERSE BRAKE. Using these keys, the user can set the motor to run in any

one of the following modes, namely Forward motoring and reverse braking. The speed can be

varied by varying the voltage given to the PWM converter (using keypad). The speed of DC

motor is directly proportional to armature voltage and inversely proportional to flux. By

maintaining the flux constant, the speed can be varied by varying the armature voltage. The

direction of rotation is reversed by reversing either field or armature voltage.

Moreover, the system is provided with Soft start facility i.e., starting the motor without

allowing the armature current to exceed the full load current. The Hardware of this system

includes uncontrolled rectifier using diodes, chopper using IGBT’S, control keys, speed adjust

potentiometer and other logical circuits.

TECHNOLOGY:

There are several applications with dc motors in our daily life. We require different speeds at

different instants depending on the applications. There are several techniques to control the speed

of dc motor; PWM technique is one in those. PWM stands for pulse width modulation. Pulse

width modulation (PWM) is a powerful technique for controlling analog circuits with a

processor’s digital outputs.

Step Down

Transformer

Bridge

Rectifier

Filter

Circuit

Regulator

section




CONTACT: +91-- 9491535690, +91-- 7842358459


CONTACT: +91-- 9491535690, +91-- 7842358459

SOFTWARE USED:

1. Embedded C

2. Keil IDE

3. Uc-Flash or ISP

4. Express PCB

HARDWARE USED:

1. 8051

2. power supply

3. Keypad

4. LCD Display

5. IGBT Driver circuit

6. IGBT Chopper

7. DC Motor

8. Rectifier circuit

APPLICATIONS:

1. Motor speed regulation

2. In manufacturing industries

3. Speed control of DC motor

ADVANTAGES:

1. Reliable operations at large currents

2. Controls the process

3. Ease of operation




CONTACT: +91-- 9491535690, +91-- 7842358459


CONTACT: +91-- 9491535690, +91-- 7842358459

RESULT:

Hence, by using this project we can effectively control the speed of DC motor by using two-

quadrant chopper method.

Documents

246.Two Quadrant Chopper Drive for the Dc Motor Speed Control