hey , in dc genarator we rotate armator where as in alternator why we make field to rotate , why this difference ? can u explain ?
2007-12-23 17:11:49 · 8 answers · asked by patlegar 1 in Science & Mathematics ➔ Engineering
they are both concurrent
2007-12-23 17:15:02 · answer #1 · answered by Anonymous · 2⤊ 1⤋
In the DC generator, the construction of the armature produces pulsating DC - the voltage isn't constant, but it's all flowing in the same direction. The voltage regulator smooths out the voltage to just over 12 volts (the usual standard). In the AC alternator, the construction of the rotating element is such that for 1/2 turn, the current will flow one way, and for the other 1/2, the other way. Diodes built into the body of the alternator convert the AC to pulsating DC, and again, a regulator circuit smooths out the voltage. The alternator is more efficient and can produce more current for the same size of device, which is why it is the standard device in vehicles now. (Solid-state diodes weren't available in years gone by.)
2007-12-23 17:18:55 · answer #2 · answered by TitoBob 7 · 2⤊ 1⤋
A generator is a machine by which mechanical energy is transformed into electrical energy. Generators can be sub-divided into two major categories depending on whether the electric current produced is alternating current (AC) or direct current (DC). The basic principle on which both types of generator works is the same, although the details of construction of the two may differ somewhat. Generators can also be classified according to the source of the mechanical power (or prime mover) by which they are driven, such as water or steam power.
2016-05-26 02:27:15 · answer #3 · answered by laurel 3 · 0⤊ 0⤋
They came up with this because in a DC generator the current left the generator armature thru the comunator by way of brushes. This caused a lot of heat thus a lot of wear on the brushes and a loss of power due to the heat therefore a generators's life was not very long. In a alternator the current leaves the alternator by way of diodes which rectify the voltage to DC (No moving Parts). The brushes in a alternators are for the purpose of exciting the field and regulating voltage output to about 13.7 volts.
2007-12-23 17:29:01 · answer #4 · answered by Marvin M 1 · 0⤊ 2⤋
A generator uses brushes which wear out. The output is DC, which still has to be regulated to give the right voltage output.
An alternator uses no brushes and gives AC. This must be rectified and regulated to give proper output voltage.
In both cases the battery acts as a huge capacitor and regulator.
2007-12-25 02:55:55 · answer #5 · answered by Warren W- a Mormon engineer 6 · 0⤊ 0⤋
well dc is direct current and that goes only one way through the wire its whats in you car probably it goes from positive to a ground and ac is altaranating current which basically goes back and forth like in a light bulb thats why the flicker not at the speed of the human eye but still their the alternator is to charge the power pack or generator, because the power goes through the generator and then to a ground the alternator keep power to the power pack
2007-12-23 17:17:25 · answer #6 · answered by glutferret 1 · 0⤊ 1⤋
The DC flows in one direction and drops current and voltage as the line length gets longer.
In AC it flows back and forth and this process allows for longer line lengths with less current and voltage drop.
2007-12-23 18:16:43 · answer #7 · answered by Anonymous · 0⤊ 0⤋
It dosn't matter as long as one moves with respect to the other.
2007-12-23 17:23:30 · answer #8 · answered by Anonymous · 0⤊ 1⤋