The speed of the generator should be the same when it is idle and when some unit is plugged in. Even then the sound changes deeper.
2007-10-31 18:43:57 · 4 answers · asked by kandan 1 in Science & Mathematics ➔ Engineering
The engine has to produce more torque to turn the loaded generator because of the extra power being demanded of it. Electricity is not generated without a price of some kind being paid by something. In this case, a higher current load demands more energy from the motor driving the generator, hence the deeper sound. Even if the idle speed of the engine is the proper running speed for the generator, more current demands more torque from the engine, which means more power from the engine. I think you need to study the "why" of engine speed control of motor-generators.
2007-11-01 01:39:47 · answer #1 · answered by Anonymous · 0⤊ 0⤋
An "electric generator" is a unit that produces electrcity from a mechanical rotation. The source of rotation can be anything (i.e. a petrol motor or a turbine in a flow of high pressure fluid.), and has nothing to do with the generator, except that that source "drives" the generator. The generator itself has two parts: a fixed part (stator) and a rotating part (rotor). The rotor rotates :-) inside a magnetic field generated by the stator. The faster the rotor turns, the higher the INDUCTION within the rotor, hence the higher the VOLTAGE output (and the frequency if it is an AC generator). The size of the wires is determined by the maximum CURRENT the generator can produce (in average, 6A per mm^2). So bigger wires allow for a higher current. The other part to take in consideration is the heat generated by the current flowing within the wires. This is the Joule effect: the elevation of the temperature in the wire increase to the square of the current. So, the bigger the wire, the lower the heat. Engineers calculate a compromise between safety (for the motor), weight (bigger wires = more weight) and required current.
2016-05-26 06:11:41 · answer #2 · answered by ? 3 · 0⤊ 0⤋
Because it slows down, because a higher current (indirectly) forces the generator engine to do more work.
2007-11-01 00:48:48 · answer #3 · answered by Marianna 6 · 0⤊ 0⤋
Bec. you're posing the generator to do more work to replace the drawn out current.
2007-10-31 18:49:43 · answer #4 · answered by rene c 4 · 0⤊ 0⤋