Robotix Tutorial 4

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This document provides an overview of robotics motor drivers and DC motor control circuits. It discusses DC motor direction control using an H-bridge circuit and DC motor speed control using pulse width modulation (PWM). PWM allows modifying the duty cycle of a waveform based on a control voltage and is implemented using the 555 timer IC to control both the speed and direction of a DC motor.

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TECHNOLOGY ROBOTICS SOCIETY Indian Institute of Technology, Kharagpur

A TUTORIAL ON ROBOTICS Motor Drivers

DC Motor Drivers ,[object Object],[object Object],[object Object],[object Object],Copyright © Robotix Team, IIT Kharagpur

DC Motor Direction Control ,[object Object],Copyright © Robotix Team, IIT Kharagpur S 1 S 3 S 2 S 4 M 1 2 V CC Power Transistor Switches

H – Bridge Working Copyright © Robotix Team, IIT Kharagpur S1 S2 S3 S4 Current Direction Effect 1 0 0 1 1 to 2 Motor spins forward 0 1 1 0 2 to 1 Motor spins backward 1 1 0 0 - Braking Occurs 0 0 0 0 - Free running

DC Motor Speed Control Circuit ,[object Object],[object Object],Copyright © Robotix Team, IIT Kharagpur

DC Motor Speed Control Cont… ,[object Object],[object Object],[object Object],Copyright © Robotix Team, IIT Kharagpur

Duty Cycle Fundamentals

Duty Cycle Cont… ,[object Object],[object Object],[object Object],Copyright © Robotix Team, IIT Kharagpur

Pulse Width Modulation ,[object Object],[object Object],[object Object],Copyright © Robotix Team, IIT Kharagpur

Both Speed & Direction Control Copyright © Robotix Team, IIT Kharagpur

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