Construction Of An Automatic Speed Control For A Direct Current Motor Using Global System Mobile (GSM)

Project and Seminar Material For Electrical Electronics Engineering EEE

Project and Seminar Material For Electrical Electronics Engineering EEE


Abstract


The automatic speed control for a Direct Current (DC) motor using Global System Mobile (GSM) modem is a device used for controlling the speed of a DC motor. It is powered electrically and operates electronically to vary the speed of a DC motor.

This project makes use of a Dial Tone Multi Frequency (DTMF) decoder after being powered to pick the key pad tones from the GSM phone, encode the tones in BCD codes to the pre programmed micro controller which decodes the BCD codes and executes the speed control of the DC motor.

The speed of the motor depends on the number (button) pressed on the key pad of the GSM phone. When button one (1) is pressed, the speed of the DC motor starts increasing. When button two (3) is pressed, the DC motor maintains a constant speed. When button two (2) is pressed, the speed of the DC motor starts decelerating. When button three is pressed, the DC motor attains a constant speed again. When button four (4) is pressed, the DC motor stops operating.

The entire work is well explained with simple and clear English language. Pictures, diagrams and formulas are included to enhance the appreciation and understanding of students, who will find this work most useful, both in classrooms and during their Industrial Training


Table Of Contents


Preliminary Page(s)

  • Title
  • Declaration
  • Approval
  • Dedication
  • Acknowledgement
  • Abstract
  • Table of Content

Chapter One

  • 1.0.0 Introduction

Chapter Two

  • 2.0.0 Literature Review

Chapter Three

  • 3.0.0 Components Used And Functions
  • 3.1.0 Micro Controller
  • 3.2.0 Crystal Oscillator
  • 3.3.0 Resistor
  • 3.4.0 Capacitor
  • 3.5.0 Regulator
  • 3.6.0 Diode
  • 3.7.0 DTMF Decoder
  • 3.8.0 Transistor
  • 3.9.0 Construction Of Project
  • 3.9.1 Principle Of Operation

Chapter Four

  • 4.0.0 Test, Result And Discussion

Chapter Five

  • 5.0.0 Conclusion And Recommendation
  • References

Chapter One


1.0 Introduction

The automatic speed control of a Direct Current (DC) motor using Global System Mobile (GSM) modem is a device that controls the speed of a DC motor when data is transmitted from the GSM modem (phone). The speed control depends on the number keyed in from the phone. The GSM modem (phone) is connected to the hardware/circuit which receives the incoming data or information from the next other GSM modem (phone). The circuit decodes the incoming data from the other GSM modem (phone) and then varies/controls the speed of the DC motor accordingly.
The controlled DC motor is designed to run on DC electric power. The rotor consists of one coil of wire wound around a core on a shaft. An electrical power source is connected to the rotor coil through the commutator and its brushes, causing current to flow in to producing electromagnetism.

The commutator causes the current in the coil to be switched as the rotor turns, keeping the magnetic poles of the rotor from ever fully aligning with the magnetic poles of the stator field, so that the rotor never stops (like a compass needle does) but rather keeps rotating indefinitely (as long as power is applied and is sufficient for the motor to overcome the shaft torque load and internal losses due to friction, etc.)

The speed of the motor remains constant (as long as the motor is not under load or performing mechanical work except that required to turn the armature) until another key/number is keyed on the GSM modem(phone).when this is done, the motor receives electric power from the source supplying it and thus increases in speed.

The speed at which the DC motor operates depends on the strength of the magnetic field acting on the armature, as well as the armature current. The stronger the field, the slower is the rate of rotation needed to generate a back voltage large enough to counteract the applied voltage. For this reason, the speed of the DC motor is controlled by using the GSM modem (phone) to vary the field current.

The circuit consists of a microcontroller, DTMF decoder (Dialing Tone Modulation Frequency) and some biasing components.


Chapter Five


5.0.0 Conclusion And Recommendation

5.0.1 Conclusion

The project produced the desired and accurate results from various tests carried out, therefore, it does not only work properly, it is very reliable.


5.0.2 Recommendation

Micro controllers are mostly used to replace bulky projects/equipments in our institutions/economy today. This makes the project user friendly, reliable, versatile and with fascinating features.

When the components and parts of this project are increased accordingly, it can be of tremendous importance to automobile industries for gear control, timber industries for driving cutting machines, Bakery for controlling mixer, and other industrial applications that require various levels of speed control.

I therefore recommend this project to the above industries where its application can be maximized.

This project can be of tremendous importance to Engineering and control industry. Micro controllers are mostly used to replace bulky projects/equipments in our institution/economy today. This gives the project fascinating features, user friendly and reliable. I therefore recommend that this project should be thought in schools and also be used in large industries were its application can be maximized.


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