PRESENTATION ON

DC MOTOR

PRESENTING BY

Abu Talha ( 143-33-2088 ) Abdur Rahim ( 143-33-2106 ) Rajjab Ali ( 143-33-2195 ) Mosharaf Hossain ( 143-33-2123 )

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

DC MOTOR

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

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

Types Of DC Motor

Separately Excited DC Motor Shunt DC Motor Permanent-Magnet DC Motor Series DC Motor Compounded DC Motor

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

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

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.

Long -Shunt Connection

Short -Shunt Connection

Compounded DC Motor

Loss Of DC MotorCopper Loss

Armature Copper Loss

Field Loss Magnetic Loss

Hystereisis Loss

Eddy Current Loss

Mechanical loss

Friction Loss

Windage Loss

Use Of DC Motor

Common In Cars,Trucks ,Aircraft and Many Other Vehicles

Lathes Drills Boring mills Shapers Spinning and Weaving machines..

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

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