principle of a generator?
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An electric generator is a device used to convert mechanical energy into electrical energy.\n\nThe generator is based on the principle of "electromagnetic induction" discovered in 1831 by Michael Faraday, a British scientist. Faraday discovered that if an electric conductor, like a copper wire, is moved through a magnetic field, electric current will flow (be induced) in the conductor. So the mechanical energy of the moving wire is converted into the electric energy of the current that flows in the wire.The mechanical energy needed to turn the generator comes from the brown hand crank at the front of the generator. In a hydroelectric power plant, the mechanical energy to turn the generator comes from the water turbine, which is turned by the force of falling water. The hand crank causes the red wire to spin inside a magnetic field (the blue lines). As Faraday learned, moving the wire through the magnetic field causes electric current to flow in the wire. The turning red wire is connected to a volt meter, which shows the amount of electric current that is produced. In a hydroelectric plant, the generator is connected to transmission lines that deliver the electricity to your home or business.\n\nThe controls allow you to control the speed and direction of the generator and turn portions on and off for greater clarity. You can also use the radio buttons to show a direct current, or DC generator (with commutator) or an alternating current, or AC generator (without commutator).
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Many times, generators are governed to maintain voltage and frequency. If this is your case, it is not surprising that RPM (and thus frequency) are constant. If your generator does not have a constant voltage regulator on it, and most don't for good reasons, then you would expect to see the voltage drop as load (current) in the busses goes up. By having a voltage regulator that droops when loaded, it allows two generators to safely be hooked together (paralelled). You could test this by starting and stopping loads on your system to see if the voltage rises and lowers during the test.
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well, the basic idea is that they're kind of like a big propeller inside a tube.  one side of the tube is connected to a sealed tank with some water in it, and the other side of the tube is vented out to the air.  when you light a fire under the water, the water boils and releases steam.  this fire can be powered by coal, oil, or even not be fire at all - in a nuclear reactor, the nuclear reaction is used to heat water that in turn boils and makes steam.\n\nif you've ever done any cooking on the stove, you know that if the container is sealed, the steam can build up to a VERY high pressure.  \n\nif you then open a valve and send the steam down the tube toward the turbine, the high pressure on one side will cause the turbine blades to spin.  just like a propellor working in reverse, essentially.  obviously i'm glossing over some of the details - there are a lot of subtle thermodynamics involved with a real turbine, and "propellor" is only a very rough approximation.\n\nso the shaft of the propeller is then connected via some gearbox to a generator.  a generator is basically a loop of wire that is free to turn in a magnetic field.  usually this field is generated by a permanent magnet.  \n\nif the loop spins, the mechanical energy of the spin is converted into electrical energy via a phenomenon called magnetic induction.  if you then connect the wires of the loop to some circuit, the induced current will power the circuit.\n\nan old roommate of mine was into collecting miniatures steam engines, for some reason, and apparently there are quite a few companies that make them.  here is a representative example of one or you can search on google for "steam turbine toy" or "steam turbine kit":\n\nhttp://www.lilliputmotorcompany.com/steam-turbine-wilesco-p-451.html\n\nas for a generator, lots of science hobby places sell little kit generators.  you don't want to use a big one as your tiny steam engine won't have enough torque to turn one over.  here's an example:\n\nhttp://sciencekit.com/category.asp_Q_c_E_440210\n\nhere are some links about how steam turbines work, and magnetic induction and generators:\nhttp://library.thinkquest.org/C006011/english/sites/dampfturbine.php3?v=2\nhttp://www.sciencejoywagon.com/physicszone/lesson/otherpub/wfendt/generatorengl.htm\nhttp://www.taftan.com/thermodynamics/STURBINE.HTM
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a hyrdo electric generator works by using water current flowing againsnt a wheel that in fact turns the generator wheel creating electricity, just like when you put your hand against a current it opushes against your hand, except its being diredcted twards a wheel that catches that current turning it into energy
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Depending on the size of the Battery. Find an electric motor that use the same voltage and connect an outside source to turn it. Motors work on the same principle as a generator (To be simple about this). If, you apply voltage to the motor it will turn, if, you turn the motor in some way; it produce voltage. You can test what I say with window fans. Take two and face them toward each other. Turn on on high and it will make the other fan turn. Take an AC volt meter and measure the voltage at the plug of the fan that being turned. The faster you can make the fan turn the better your output voltage. This work the same with a little electric motor for your generator. If, it run on 12 volts DC then it will output the same, if, it turned fast enough and actually charge a battery. Hope this enough to help.
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In the same manner as a turbine with a horizontal one, by the water moving the blades. its tha rotation that generates the power. The alignment of the shaft doesn't matter, its the force transferred to the generator/alternator that matters.\n\nThere shouln't be any significant change in the turbine blades.\n\nIt may be easier in certain designs to couple the generator set to the shaft if its mounted vertcially in some locations.
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Electricity generated by relative motion of a magnetic field and an electric charge.\nMaxwell's 2nd equation states that a magnetic field that varies at a given point induces an electric field that exerts a force on an electric charge.  This force moves the charge.  The free electrons in a conductor are such a charge, and are moved by the relative motion of the conductor and the magnetic field.  \nGenerators and transformers are common applications of this effect.  In a generator the magnetic field may be intrinsically constant (created by DC or a permanent magnet), or varying (created by AC).  The conductor is a coil or set of coils.  No mechanical relative motion of the field and conductor is needed if the field is intrinsically varying.  If such relative motion is needed, the coil can be rotated with the magnetic field held stationary or vice versa, so relative motion of the conductor and the magnetic field occur.  \nIn a transformer the current is always AC and no mechanical motion is needed.  The magnetic field is produced by an input coil (an electromagnet), which shares its core with the output coil for good magnetic field coupling.
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You need to know more information.  How many Poles does the Generator have?  How many windings per pole?  Is it synchronous or a-synchronous?  What is the reduction ratio between the turbine and the generator?  Does the generator utilize an armature, brushes, or slip rings?  is the generator self exciting?  At what frequency will the output be?
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The quick answer is no, if you could you'd have invented perpetual motion. \n\nIf the battery has a certain amount of stored energy, when it turns the motor some energy is lost (the motor will be about 80-90% efficient) with the same lost in the generator giving and approximate conversion of 60-80%.\n\nThe batteries themselves will also be inefficient in the charge discharge cycle, more so than the motor-generator combination although I haven't found a specific value. However, whenever you charge a battery it gets warm and this warmth is due to energy losses in the charge cycle. \n\nCoupled to all of these would be electrical losses in the wiring, but these would be minimal compared to the other losses.
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First of all the correct name of that machine is "Van De Graaff" Generator; named after the person who invented it.\nSecond, congratulations on your choice. I won a science fair by making one. I can assure you that the home-made ones are safe; the voltage gets high but not the amperage. Actually I play with it, sparkling by my fingers (I do not suggest doing so for a long time). The problem might be that, it terribly ionizes the air; not so good to breathe.\nAnd finally I have build mine base upon the article I have mentioned here as source.
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1. Motor driven Van de Graaff Generator.\n\n2. High voltage multiplier - Jacob's Ladder.\n\n3. High voltage induction coil - Tesla Coil.\n\n4. Flyback Transformer.
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In order to know how 3-phases of voltage (separated by 120 degrees) are produced, one would have to know how a 3-phase generator works and know a bit about electromagnetic theory.\n\nIn nearly all power plants (except for some wind turbines), a 3-phase synchronous generator is used.  This type of generator has one or more wire coils attached to the shaft (the rotor) and a set of coils evenly spaced around the frame surrounding the shaft (this area is known as the stator).\n\nThe coils on the rotor are energized by a small DC source and become constant electromagnets with north/south poles determined by the direction in which the current flows.  The shaft is moved by a source of mechanical power.  Generally a steam turbine is used where the steam is heated from some source of energy like coal, natural gas, nuclear etc.\n\nSo as you can imagine, we have one or more electrogmagnets attached to a shaft being rotated by a turbine.  Remember that these rotating electromagnets are inside the evenly spaced windings on the stator.  Faraday's law states that a time-changing magnetic flux in a coil will produce a voltage in that coil.  Since the rotor electromagnets are constantly changing position relative to the stator coils, the magnetic flux seen by the stator coils is also constantly changing.  The wire coils on the stator frame are evenly spaced such that the induced voltage waveforms will be spaced 120 degrees apart.\n\nSo, we then have sinusoidal voltage waveforms produced on the stator coils such that they are 120 degrees apart.  These coils on the stator are then connected in either wye or delta configurations and carefully hooked up to the power grid.\n\nSo that is a somewhat simplified view of what is happening.  There are various other complications that I have not mentioned, but are not important in getting the general idea.  You might be able to find a nice 3-phase electric generator animation on howstuffworks.com or Wikipedia.
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"Because it lacks a separate field circuit, an induction generator cannot produce reactive power.  In fact, it consumes reactive power, and an external source of reactive power must be connected to it at all times" [1].\n\nSo you are right that you will need a three-phase capacitor bank at the output terminals (delta-connected).\n\nHow to size the capacitors?\nThat depends on a few things.  Namely what kind of loads are going to be attached to it.  I presume this is going to be an emergency generator operating alone (most induction generators are used this way nowadays).  In that case, your capacitor bank will need to account for the generator consuming reactive power and the loads consuming reactive power.\n\nSo, if you know what you are going to connect to the generator, figure up an estimate of the total reactive power of your loads.  Then estimate how much reactive power your generator consumes (not sure how to do this; maybe estimate from your 7.5kW and 9.4kVA ratings?).\n\nFinally, to size your capacitors equate the total power consumed by gen and loads to this formula:\n\nestimated_3phase_power_consumed = 3*(line-to-line_volt)^2/X\nwhere X = 1/(2*pi*freq*C)\n\nSolve for C and there you go.  My source indicates that the output voltage for an induction generator can vary quite a bit with varying inductive load, so bear that in mind and maybe oversize the caps a bit.  Also, the types of capacitors should be able to withstand AC obviously and be rated within your expected operating temp, etc, etc.\n\nGood luck.
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I don't know the exact definition, but they differ on the way they deliver energy.\nDC generators give electricity at a given steady voltage, but AC generators give electricity in an continuous alternating voltage.
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There is a lot of possibilities starting from the simplest one which is wind generator.  More complicated would be water generation where a usually dam is build and potential energy of the water accumulated behind the dam moves water through turbines and generates power. Some other may include thermal energy of the earth. If you drill deep enough you will get to the earth crust zone where temperature is high to produce steam and this steam is converted (generated) into the electric power. Ocean waves are also source to generate energy.
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I assume you mean diesel engine powered generators.\nDiesel generators come in lots of different sizes and generating capacities.  If you have seen three generators used for a concert, that is for one of two reasons: either they want to have redundancy (spares) - that is, to be able to quickly put another generator on line in case one fails, or the generators are small and they need three to provide enough electricity.\nIf there is a place where you live that rents generators, they might be able to help you with your project.
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Generator generates electricity. It has a wire armeture mounted in an electic field. When the wire armeture is rotated, electric current is induced in the armeture du to change in magnetic flux.