Application of electric motors or drives in rolling mills

1. Application of Electric
motors or drives in
Rolling mills
By
MuhammadYousuf

2. Outlines
Rolling mill
Ac drivesor Motors
DCDrives or Motors

3. Rolling mills
o The process of deforming metal by passing it
between rolls
o Rolling mill is a machine or a factory for
o shaping metal by passing it through rollers
o to crush or grind various materials, such
as grain, ore, gravel, plastic, and others
o A rolling mill basically consists of
o • rolls
o • bearings

4. o Rolling is used mainly to produce sheet of metal
o or simple cross sections, such as rail tracks.
o a drive (motor) for applying power to the rolls and
controlling the speed
o rolling mills are one of the most demanding applications for motor
drives
o Typical motor sizes for modern rolling mills is 600kW to 1200kW

6. Ac drives or Motors
Synchronous motors Salient pole type
synchronous Motors
o applied for large power and/or heavy torque
applications
o for example hot strip mill rolling
o Excellent torque characteristics
o High efficiency
o Unity power factor and ease of controllability.
AC drive solution for each type of rolling mill application, ranging
from large torque, slow-speed rolling mills to the high-speed, wide
tension range rolling mills

7. Induction motors: Squirrel cage rotor induction
motor
o are suitable for medium power applications
o Extremely robust construction
o High flexibility
o Excellent torque characteristics,
o especially for ultra low speed rolling applications
o They are available up to 18 MW
o synchronous Motors- rated torque up to 2400 kNm, rated power up to 20 MW
and top speed up to 1800 rpm

8. Dc drives
o DC drives have been used successfully in
rolling mill applications for many years
o Rolling mill DC motors are best at low
speed, high torque application.
o easy to operate & compact
o Superior functionality
o Efficient power output

9. References
http://www.russula.com/articles/article-04.php
http://www.tmeic.com
http://www05.abb.com
https://books.google.nl
wikipedia.org/wiki/Rolling