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Electrical Machines

by Ron Kurtus (28 January 2016)

Electrical machines (also known as electric machines) are devices that convert mechanical energy and electrical energy. An electrical generator converts mechanical energy to electrical energy.

An electric motor converts electrical energy to mechanical energy. An alternating current (AC) transformer changes the level of AC voltage and is considered by some also as an electrical machine.

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Electric generator

The way an electrical generator works is that mechanical energy turns the shaft going into the generator. The rotation moves electrical wires past permanent magnets, thus creating an electrical current in the wires. The current may be alternating current (AC) or direct current (DC), depending on the configuration of the commutators on the shaft.

Electric motor

An electric motor is basically a generator in reverse. Electrical current is fed into the motor wires, which are wrapped around an iron core, thus creating an electromagnet. The magnetic field then repels the permanent magnet around the core, thus causing the shaft to rotate.

An electric motor can be an AC motor or DC motor, depending on the commutator configuration.

AC transformer

An AC transformer consists of an iron containing two wrappings of insulated wire. The input voltage is converted to an output voltage, according to the ratio of the number of turns of the wire.

AC voltage can be increased or decreased according to the the ratio of the turns of wire.

There is debate as to whether an AC transformer is really an electrical machine since there is no resulting motion.

Summary

Electrical machines or electric machines are devices that convert mechanical and electrical energy. An electrical generator converts mechanical energy to electrical energy. An electric motor converts electrical energy to mechanical energy. An alternating current (AC) transformer changes the level of AC voltage and is considered by some also as an electrical machine.


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Resources and references

Ron Kurtus' Credentials

Websites

Electrical machine - Wikipedia

Electric machine - Wikipedia

Electromechanics - Wikipedia

Machines Resources

Books

Top-rated books on Simple Machines

Top-rated books on Machines


Questions and comments

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