Electric motors and generators are used to convert the mechanical energy into electrical, and also the opposite, by electromagnetic means. It is classified as generator or dynamo the machine that converts mechanical energy into electric and from electric motor to machine that does the opposite.
The simple dynamo-electric machine is the disc dynamo that was developed by Faraday, from a mounted copper disc so that the part of this disc lies between the center and the edge of the two poles of a horseshoe magnet. The magnetic field of a permanent magnet is strong enough to run a motor.
best motors at mrosupply
Two physical principles are the basis of the operation of generators and motors, the first being the induction principle discovered in 1831 by Faraday. It moves through the magnetic field, or is in the vicinity of a driving circuit whose intensity can vary.
The opposite principle was verified in 1820, by André Marie Ampère. If a current passes through a driver within a magnetic field, it will exert a mechanical force on that driver.
Also known as AC, AC electric motors are industrial, and can be classified as synchronous and asynchronous three-phase and single-phase. The asynchronous type motor deals with a slip, according to the load intensity, however, most of the industries work with this type of device.
In the case of synchronous motors, they are generally more used in thermoelectric and hydroelectric plants. This synchronous term is due to the fact that the machine acts with speed of rotation in constant synchrony with the frequency of the electric tension that oscillates. AC motors also receive other types of classification, such as double-pole motors, because they can rotate at two different speeds in relation to their power, and double-spindle motor, which has only one output for each side.
more transformers here
DC motors, also called DC motors, perform their functions, basically with the aid of direct current. The components in it consist of a commutator ring, stator, brushes and rotor. The rotor has one or more bearings, which when energized produce a magnetic field. The magnetic poles inserted into the rotor field are attracted to the opposing poles, generated by the stator.