Electric motors and drives are commonly used in rolling mills. AC drives with synchronous or induction motors are suitable for medium to large power applications in rolling mills. Synchronous motors can provide excellent torque for applications like hot strip mills. Induction motors are robust and flexible, especially for low speed rolling. DC drives have also been used successfully in rolling mills, as they are efficient for low speed, high torque applications. Rolling mills require motor drives ranging from 600kW to 1200kW or larger synchronous motors up to 20MW.

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