Dc motor

1. PRESENTATION ON
DC MOTOR

2. PRESENTING BY
 Abu Talha ( 143-33-2088 )
 Abdur Rahim ( 143-33-2106 )
 Rajjab Ali ( 143-33-2195 )
 Mosharaf Hossain ( 143-33-2123 )

3. OVERVIEW
 About DC Motor
 Types Of DC Motor
 Separately Excited DC Motor
 Shunt DC Motor
 Series DC Motor
 Compounded DC Motor
 Application Of DC Motor
 Discussion

4. DC MOTOR
A DC motor is any of a class
of electrical machines that
converts direct current elec-
trical power into mechanical
power .

5. DC MOTOR
A DC motor is any of a class
of electrical machines that
converts direct current elec-
trical power into mechanical
power .
Equivalent Circuit Diagram Of DC MOTOR

6. Types Of DC Motor
 Separately Excited DC Motor
 Shunt DC Motor
 Permanent-Magnet DC Motor
 Series DC Motor
 Compounded DC Motor

8. Speed Control Method of
Shunt DC Motor
 Adjusting The Field Resistance
(and Thus The Field Flux)
 Adjusting The Terminal Voltage
Applied To The Armature
 Inserting A Resistor In Series With
The Armature Circuit

10. A Series DC Motor is a DC Motor Whose Field Windings
Consist Of a Relatively Few Turns Connected in Series With
Armature Circuit
Short -Shunt Connection
Series DC Motor
VT = EA + IA(RA+RS)
IA = IL – IF
IF =
VT = EA + IA(RA+RS)
IA = IL – IF
IF =
Types Of DC Equivalent Circuit Of Series DC Motor Motor

11. Speed Control Method of
Series DC Motor
 Only One Efficient Way
That Is Changing The Terminal
Voltage
 By Increasing A Series Resistor ,
The Speed Can Be Calculated, But
That Is Very Wasteful.

12. Long -Shunt Connection
Short -Shunt Connection
Compounded DC Motor

13. Loss Of DC Motor
Copper Loss
 Armature Copper Loss
 Field Loss
Magnetic Loss
 Hystereisis Loss
 Eddy Current Loss
Mechanical loss
 Friction Loss
 Windage Loss

14. Use Of DC Motor
Common In Cars,Trucks ,Aircraft
and Many Other Vehicles
 Lathes
 Drills
 Boring mills
 Shapers
 Spinning and Weaving machines..

15. Use Of DC Motor
 Electric traction
 Cranes
 Elevators
 Air compressor
 Vacuum cleaner
 Hair drier
 Sewing machine

16. DISCUSSION
?

17. Thanks Everybody
For Being With Us