He had 700 patents. Tesla's discoveries include the Tesla Coil, fluorescent light, wireless transmission of electrical energy, remote control, cosmic radio waves, the use of ionosphere for scientific purposes and many others.
He was born in
From an early age he showed
an interest in mathematics, mechanics physics an 727h78h d scientific phenomena. At
nineteen, training for an engineering career, he attended the
Then Tesla went to work in
A year later George Westinghouse, head of the Westinghouse Electric Company, purchased the Tesla's polyphase system and other 40 patents that contributed to breaking the Edison's monopoly on electric power. There were therefore two types of electrical supplying system, but the Westinghouse built power plants and transmission lines proving once and for all that AC system was better then the DC one.
The first hydroelectric power
plant was built on
Later Tesla used his money to
start the Tesla Electric Company in
The major advantage of AC electricity over DC is that AC voltage can be step up and step down by use of a transformer. This means that the high voltage used to carry electricity over long distances from the power station then could be reduced to a safer voltage for domestic use. So: high voltage, little current line, less heating losses, smaller conductor size, less costs and more efficiency. On the contrary DC system limited its distribution distance to about a mile.
Thanks to Tesla's inventions we have different types of electric and electromechanical machines such as the three-phase transformer, generator and motor.
A machine used for the production of alternating current is the 3-phase synchronous alternator.
This machine is reversible and can be run as a synchronous motor.
In its simplest form it consist of a set of poles, produced by a winding which is energized by a d.c. generator, and one or more windings in which a.c. is generated. When the set of poles is rotated, the relative motion between the armature winding and the magnetic field produced by the poles causes the armature conductors to cut the pole flux. It means that voltage is induced in the armature winding.
Since an armature conductor which previously was under the influence of the north pole, comes under that of the south pole, the direction of the e.m.f. induced in the conductor reverses periodically. And when the ends of the armature windings are connected to an external circuit an alternating current is generated. The frequency depends upon the number of its poles and the rotative speed of the rotor.
So the basic construction of
The field structure may be of either the salient- or non-salient pole type. This latter is more feasible for the higher-speed machines and is used in steam-turbine-driven generators. The salient-pole construction is suitable for multipolar medium- or low-speed machines. It is therefore commonly used for water-turbine or engine-driven alternators and for synchronous motors.
The 3-phase synchronous motor
is not widely used but it has some advantages. In fact the constant speed can
be useful in specific applications, it's not deeply affected by different
voltage values and its performance is more affective than the one of
asynchronous motor of equal power. The disadvantages are: it needs both a.c.
for the stator and
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