AC Generators
Electric Circuits:
The use of electric and magnetic phenomena to produce energy and motion has been a major concern of science and engineering since the nineteenth century. Currently, the use of generators and motors for such purposes has become common in most mills used a scientific scale, industrial and domestic.
generators and motors:
The power can used as source and destination for numerous applications. For production and utilization using two general classes of devices:
· The generators , which convert a type of energy (chemical, mechanical) into electrical energy.
· The engines, which make a reverse transformation and use that power to generate movement.
CA Builder:
In the illustration we see a loop of wire located in the center of a magnetic field (represented by magnets labeled N and S ) which is supposed to be the representation simplified a number of turns (the set of all having a motor or a generator is called a coil). We must now explain what happens in the loop of wire to turn this into a magnetic field. The magnetic field moving through the loop of wire that originates at the ends of it there is a difference of potential (or voltage).
Since the ends of the loop are connected to a pair of circular rings which are fitted onto the generator shaft, we will have both a given voltage. The way we get access to this stress is to connect a few wires to the rings out. To do this we must use some form of connection to them and which is also conductive. We are talking about the brushes, which are conductive and, by some mechanical pressure, ensure the perfect combination of output circular rings and wires carrying electricity output.
For real generator winding the coil is a (more or less complex) connected to a pair of brushes (or a set of them) and its output voltage is usually quite high.
The representation of an AC voltage corresponds exactly to this type of graph. As we can see, the tension is zero at a given (no magnetic field line through the loop) to take a maximum value (the point at which the loop is traversed by the largest possible number of magnetic lines) . Between these two values \u200b\u200bthere is a variation of the real voltage value corresponding to the various intermediate positions of the loop.
Once the loop has passed to be vertical to horizontal position (value of maximum stress), the loop continues with his rotation, but this time, due to the symmetry of the construction of the generator is passed to decreasing values \u200b\u200bof voltage, to be worth zero again.
Due to the flow of both the electric and the magnetic field in the loop studied by following the turning (we had reached the 180 degrees of rotation) comes from a growing tension but of sense (or polarity ) opposite to the previous.
The sum signal of the continuing rise of the coil turns the AC voltage signal described.
These animations help you understand better operatre an AC generator Sources:
- http://www.hiru.com/es/fisika/fisika_04100.html
- http://es.geocities.com/pnavar2/ac_dc/gener_ac.htm
- http://www.selectividad.tv/S_F_1_2_1_S_produccion_de_corriente_alterna.html
- http://www.walter-fendt.de/ph14s/generator_s.htm
