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Facworld Ezine 59 DC Power in Industry - Mighty Torque and Variable   Message List  
Reply | Forward Message #67 of 70 |

***********************************************************

FACWORLD EZINE
The Facilities, Mechanical, Electrical Resource Center

***********************************************************


November 4, 2006
Editor: Thomas Yoon

contact: http://www.free-marine.com/emailform.htm
Publisher: Facworld Ezine


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IN THIS ISSUE
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Publisher's Note
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Publisher's Note
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Hi there,



DC Power in Industry - Mighty Torque and Variable Speeds

Although we can find many applications of AC in industry, we
still find that there are many industrial processes that
require DC for their operation.

Some of these applications include battery charging, emergency
lighting, welding, electroplating, metal refining, metal
reduction, communications and many others.

Unlike AC generators, the speed of DC generators are not so
critical. Therefore, small DC generators can be belt-driven,
gear-driven or direct driven by prime movers. Large DC
generators are always direct driven. Some of the prime movers
used are AC motors, petrol or diesel engines, water or steam
turbines.

Small DC generators are driven from 300 to 1800 rpm, while
larger generators are driven from 60 to 250 rpm. Because of
line voltage drops, the direct current produced are only
transmitted over short distances.

For convenience, many DC applications uses rectifiers to
convert AC supply to DC supply. These rectifiers usually
make use of solid-state semiconductors because they have no
moving parts and are very robust in construction. When such
rectifiers are used, some sort of wave filters need to be
installed to smoothen out the pulsating DC supply obtained
through rectification.

For short term applications, batteries are used to supply the
necessary DC supply. These have to be recharged during and
after use by DC generators or rectifiers. The DC supply
obtained from batteries are smooth.

Many people do not realize it, but the generation of AC power
requires the use of a DC supply at its field coil to maintain
a constant magnetic field. This source of DC supply is
obtained from either a DC generator or a rectifier unit.

In modern brushless AC generators, the rectifier unit together
with the field coil are actually fixed to the rotating rotor
and moves with the rotor.

DC motors have the advantage of excellent starting torque and
wide ranges of speed control. They are therefore used to drive
machines that are difficult to start under load or are
required to run at varying speeds. Another advantage of DC
motors is the fact that they can be reversed very easily. By
just varying the polarity of the field coil supply, the motor
can be made to run in the reversed direction.

Some of the applications of DC motors are in large steel
rolling mills, electric railways, elevators, hoists and cranes.
All these applications require that the machines can be easily
started from standstill on heavy loads and then proceed to
full speeds in a very short time. The speeds of rotation of
these machines are also required to be controlled very
accurately.

Electronic controls are used to vary the speeds of DC shunt
motors by adjusting the armature voltages. Variable voltage
for the armatures are supplied by silicon controlled rectifiers
(SCR) circuits.

Can you imagine how life will be like without these DC
machines? For tall buildings, the occupants will have to
endure erractic elevator movements whenever the number of
passengers changes. Isn't that annoying?





Until next time...


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~Disclaimer: Facworld provides Ad listings
and opportunities as a service for our subscribers.
Although we do make an effort to verify offers, we do not
accept responsibility for the validity of the information
presented. Please conduct your own evaluation of offers.

------------------------------------------------------------
Contact Information
------------------------------------------------------------

Thomas Yoon, Publisher/Editor
4186 Bagan Luar Road
12000 Butterworth
Malaysia

Contact me at http://www.free-marine.com/emailform.htm


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