1. B.H. GARDI COLLEGE OF ENGINEERING AND TECHNOLOGY.
DEPARTMENT OF ELECTRONICS AND COMMUNICATION ENGINEERING
INTRODUCTION TO D.C. MACHINES AND ITS APPLICATIONS.
SUB- EM
PREPARED BY- CHANGRANI MEGHANA (13EC06)
GOHIL ASHWINIBA (13EC11)

2. CONTENTS- WHAT IS A D.C. MACHINE? TYPES OF D.C MACHINE D.C. GENERATOR
D.C. MOTOR
APPLICATION OF THE D.C. MACHINES

3. WHAT IS A D.C. MACHINE?
THE DEVICES OR THE INSTRUMENTS WHICH MAKES THE HUMAN EFFORT EASY IS CALLED A MACHINE
THE MACHINE WHICH RUNS ON THE DIRECT CURRENT IS CALLED D.C. MACHINE
THE D.C. MACHINES WERE THE FIRST ELECTRICAL MACHINES INVENTED BY HUMAN BEINGS.

4. TYPES OF D.C MACHINES THERE ARE TWO TYPES OF D.C. MACHINES.
1- D.C. MOTOR
2- D.C. GENERATOR
THE DEVICE WHICH GENERATES THE ELECTRICITY IS CALLED THE GENERATOR. IT IS BASICALLY RUN BY USING THE PRIME MOVER.
THE DEVICE USED FOR DOING THE MECHANICAL WORK IS CALLED THE MOTOR. IT IS RUNNED BY ELECTRICITY.

5. D.C. GENERATOR
THE D.C. GENERATOR WORKS ON THE PRINCIPLE OF THE DYNAMICALLY INDUCED E.M.F.
THIS E.M.F IS INDUCED IN THE GENERATOR ACCORDING TO THE FARADAY’S LAW OF MUTUAL INDUCTANCE.
THERE ARE TWO TYPES OF D.C. GENERATORS.
1- SELF EXCITED
2- SEPERATELY EXCITED GENERATOR

6. THERE ARE THREE TYPES OF EXCITED GENERATORS
1- SHUNT MACHINE
2- SERIES MACHINE
COMPOUND MACHINE
IN SHUNT FIELD GENERATOR FIELD WINDINGS AND ARMATURE WINDINGS ARE CONNECTED PARALLEL TO EACH OTHER.
THERE ARE TWO TYPES OF SHUNT FIELD GENERATOR
1- LONG SHUNT GENERATOR
2- SHORT SHUNT GENERATOR
IN SERIES FIELD GENERATOR FIELD WINDINGS AND ARMATURE WINDINGS ARE CONNECTED IN SERIES WITH EACH OTHER.

8. D.C MOTOR
THE D.C.MOTOR WORKS ON THE PRINCIPLE OF FLEMMING’S LEFT HAND RULE WHEN A CURRENT CARRYING CONDUCTOR IS PLACED IN A MAGNETIC FIELD.
THERE ARE TWO TYPES OF MOTORS
1- SERIES MOTORS
2- SHUNT MOTORS

10. APPLICATIONS OF D.C MACHINES
D.C GENERATORS ARE GENERALLY USED FOR LIGHTING, POWER SUPPLY AND HEAVY POWER SERVICES
THEY ARE ALSO USED FOR RUNNING D.C. MOTORS
WHILE D.C. MOTORS ARE USED FOR LATHE MACHINES, DRILLS, ELECTRIC TRACTION, CRANES, ELLIVATORS, AIR COMPRESSORS ETC…..

11. SOURCE
INTERNET
A TEXT BOOK IN ELECTRICAL TECHNOLOGY VOLUME 2 BY B.L. THEREJA
DCM&T BY Dr. J.G. GAMNANI

12. THANK YOU