Westinghouse Modules 1C-,5X- Emerson VE-,KJ-
Honeywell TC-,TK- Fanuc motor A0-
Rosemount transmitter 3051- Yokogawa transmitter EJA-
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The electric motor in its simplest terms is a converter of
electrical energy to useful mechanical energy. The electric motor
has played a leading rolein the high productivity of modern
industry, and it is therefore directly responsible for the high
standard of living being enjoyed throughout the
industrialized world.
The beginnings of the electric motor are shrouded in mystery, but
thismuch seems clear: The basic principles of electromagnetic
induction were
discovered in the early 1800’s by Oersted, Gauss and Faraday, and
this combination of Scandinavian, German and English thought gave
us the
fundamentals for the electric motor. In the late 1800’s the actual
invention of the alternating current motor was made by Nikola
Tesla, a Serb who had migrated to the United States. One measure of
Tesla’s genius is that he was granted more than 900 patents in the
electrical field. Before Tesla’s time, direct current motors had
been produced in small quantities, but it was his development of
the versatile and rugged alternating current motor that opened a
new age of automation and industrial productivity.
An electric motor’s principle of operation is based on the fact
that a current-carryingconductor, when placed in a magnetic field,
will have a force
exerted on the conductor proportional to the current flowing in the
conductor and to the strength of the magnetic field. In alternating
current motors, the windings placed in the laminated stator core
produce the magnetic field. The aluminum bars in the laminated
rotor core are the currentcarrying conductors upon which the force
acts. The resultant action is the rotary motion of the rotor and
shaft, which can then be coupled to various devices to be driven
and produce the output.
Many types of motors are produced today. Undoubtedly, the most
common are alternating current induction motors. The term
“induction”
derives from the transference of power from the stator to the rotor
through electromagnetic induction. No slip rings or brushes are
required since the load currents in the rotor conductors are
induced by transformer action.
The induction motor is, in effect, a transformer - with the stator
winding being the primary winding and the rotor bars and end rings
being the movable secondary members.