Generator Definition and 1000 Threads

Hi, I'm a electrical engineering student and i have a question conserning synchronous machines, more precisely a sinchronous generator. Considering that's no change in load, the increase of the field current of the rotor would imply in a change in the torque angle? I need a detailed...

Please teach me this: How do we know the generator of U(1) symmetry is the operator of electric charge.Is this observation(the value defined by the operator) being the reserved observation deducing from Noether theorem(considering U(1) symmetry).And also how we know this Noether reserved...

I know the power delivered by a generator is IV and I'm ok with that. I'm just curious, why doesn't it include a term involving a magnetic potential? I mean when the generator moves a charge it does some work per unit charge (V) because it applies a force storing energy in the electric field...

Alright, so I am building a hand crank generator, and my goal is to replicate the K-tor pocket socket. http://www.k-tor.com/ The goal is to power a universal powermat with the generator. I need to produce 10watts at 120volts, and my group is completely lost. If anyone could provide...

Hi, I am in processing of sizing a generator that biomass as fuel to be fed back to the grid as part of feed in tariff initiatives. However, I would like to know roughly how this feeding mechanism works. For example, in a workshop, a machine motor would initially draw up to 5X the rated motor...

Suppose that the stator of an induction motor is connected to grid and the rotor is run faster than the synchronous speed. Now the current direction in the rotor circuit reverses because air gap flux as seen by the rotor rotates in reverse direction at slip speed. To maintain the same flux in...

Hi, i am developing a home-made generator but i am having some trouble with coil design. Going on Faraday's induction formula : V = N A (2 pi RPM/60) B a 50 turn coil with a radius of 20mm going at 20,000 RPM should give me 80 volts or so, in practice i am getting much less than...

Hi, I have a questions about generators and how they generate electricity. Why is that some generators generate large electrical power running at 3600 rpm, and yet some generate little electricity running at the same speed? And why are low rpm generators (e.g. 900 rpm or less) able to...

Hi, I hope someone can help me. Looking at the attached picture design of a magnetic generator, I would like to try and build my own. If I had to build a generator producing 60 kW at 240 rpm, how big should the magnets be, and what gauge copper wire and length should I use? If I would like...

(QUESTION:) I was Thinking of Creating a Generator System... Okay, so I've been thinking about creating a generator system that doesn't reply on a Ful powered engine and to eventually get off of the "grid' completely one day... Also, in the last 4.5 years since we've moved into this house...

Homework Statement I have a problem which I will attach a picture of, regarding a system composing of a heat recovery steam generator and a turbine. I have to work out the power output of the turbine, which I think I will be fine with. What I would like to know is, how does the combustion...

If you are turning a generator by hand that is directly wired to a electrical motor will it transfer the electrical energy produced by the generator to a electric motor more or less efficiently then with a pure mechanical system? assuming that the input energy is located away from the output...

Many sites describe their windmills in terms of wind speed, minimum or max etc. Can anyone share with me how much force in terms of how much torque or kg force is needed to get it rotating? Is there any conversion formula to it? I'm sure different size of generator would require different force...

If a person in USA makes a wind turbine or some sort of other power generator and has more power left over,can he supply that to the national power grid and earn money?If so how much?

I have problem after purchasing a Subaru 1700i inverter generator on ebay. The AC 240 doesn't work but the DC 12V works. It is written on the DC 12V "Only for battery charge" I tried to put a small inverter and a 230W halogen light directly on the battery + and - . The light started to work but...

Few questions about Synchronous generator. A rotor is rotating with angular frequency ω. In this rotor we have windings, which produce magnetic field, through a DC supply. This supply is connected to a rotor with brush contacts. Now this field induces a emf in windings, which are in...

Hi, this problem is from 'Electromagnetism' by Grant & Phillips and it states, Homework Statement 'http://i1129.photobucket.com/albums/m505/physicsbird1/126fig.png" shows a cross-section of the cylindrical high-voltage terminal of a van der Graaff generator, surrounded by an 'intershield'...

Hi Physics Guys, I'm not a physics guy myself but some google searching lead me to this site so I signed up so I could ask a question. I'm into amateur motor sport and I'm currently driving a 1999 Subaru WRX. Anyway I'm always looking out for anything that will increase it's performance...

I have a question that iv been stuck on for wile. I am in year 2, electronic engineering and I am having a little trouble with this. A separately excited shunt generator has the following nameplate data, 50kW, V(FL) = 125, R(A) = .01 ohms, R(F) = 16 ohms and an excitation voltage of 125 VDC...

Hello, I want to use a DC permanent motor as a generator in order to use it to charge a battery. This generator will be rotated by hand. The speed is varying as it rotates by hand. I would like to know what is the circuit that I could use it to charge 12 V chargeable batter? Best wishes,

To compute the checksum for some frame with m bits, corresponding to the polynomial M(x), the frame must be longer than the generator polynomial. Why...?

I was reading about synchronizing of two AC generator. As an aid to grasp the concept, I tried to analyze what will happen if two generators of same frequency and voltage but slightly different phases were paralled. I am slightly surprised to find out that active power flows in there...

Hi, I have seen this pdf (http://homepage.ntlworld.com/julien.dourado/zeph_tech_web/academic_research/1_permanent_magnet_generator.pdf), on page 2 they show a picture of the stator and rotor discs. From what I can see here, they have magnets on either side of the copper wire coils (top and...

Hi, I hope someone can help me. Looking at a magnetic generator, we will have a ring of magnets which will rotate, and then we have the copper wire static. I understand that if I have a ring of alternating magnets, all placed right next to each other, thereby creating a solid magnet surface...

Hi, I hope someone can help me. Looking at a magnetic generator, we will have a ring of magnets which will rotate, and then we have the copper wire static. I understand that if I have a ring of alternating magnets, all placed right next to each other, thereby creating a solid magnet...

Ok here's an idea that isn't a perpetual motion machine (it's no more perpetual than solar cells): Using a big magnifying lens or parabolic mirrors, what are the formulas when either of them are used to evaporate water into water vapor steam to move a turbine to power an electric generator?

Square wave generator...what? Okay, so I built a square wave generator using a 555 timer and schematics that I found off the internet. Upon completion, I dumbly realized that there is only an output. I wanted to use the square wave generator in resonance inductive circuit, but seeing as there...

When I have the Vphase (254 V) S phase (6.2KVA) and I (24A) ? Help !

I need to do some calculations to know if a metal sphere (iron, steel, whatever) that is 0.25kg is dropped from 2 meters, will it produce enough torque (kenetic energy?) to start a generator with the specifications below? Furthermore, if a metal sphere was dropped every second, continuously...

I have a huge generator 2.5MW and I need to calculate the mechanical energy (kinetic energy) it contains when it is running at rated speed (2975 R/min). How can I do that and I quantities do I need ? My goal is to relate how much electric energy the generator produces as depending on its...

I just bought a new rigol DG1022 function generator and I noticed that when I turn the voltage higher than 2V peak to peak, the FG emits a faint high pitched sound. It's barely audible; maybe around 15 kHz. Is that normal for a digital function generator, or does that mean that something is...

I am currently working on a small personal project. It is a small under-water generator/ motor so the setup is as follows. The generator and gearbox are mounted on steel struts within an air-tight nacelle of sorts which is cylindrical and made of steel. The nacelle is submerged in cold water...

Homework Statement I want to run a magnetic liquid past a coil to product a current. In a vertical tube I want to inject an air bubble to push the liquid upwards. Of.course the air escapes the top and the liquid re-cycles. - Like a variant of Faraday's Generator with moving liquid magnet...

hello , i wanted to get a random number generator for colored as well as white noise. all numbers in the range should be equally likely to be produced.. ie, say within 1-100, 50 shouldn't hav an extra high probability. on the net i found this fortran program. http://fortran.com/gauss_random...

hi, thank you for taking the time to read my post, im looking at how to convert the force from a piston moving at approximately 1 meter per hour into electrical power via generator, any ideas appreciated the piston will be slow moving but generate an extremely large force, its a question...

Hi Everyone. I'm new here and glad to find a community with ideas and creativity. I have a stream behind my house that I feel could be utilized for hydro electrical power. I am no engineer but I've been reading up on it's potential for electrical energy. Trouble is that this stream has very...

I'm writing a paper on MHD. I wanted to know briefly about 1. why is MHD no longer a very popular idea. 2. Whether its worthwhile to think about it as a possible feature of hypersonic planes in the future inspite of its dwindling popularity. If possible, please provide links.

Homework Statement Vande Graff generator is used to generate potential difference to the order of 107 volts to accelerate charged particles. Homework Equations My question is, " Will this voltage can be used to accelerate electrons or it is merely confined to accelerating positive...

I am studying Electrical machine course on my engineering semester. Can you you people provide me links for animation pics or video for working of dc generator and dc motors? Thanks for your help.

We have a slip-ring asynchronous (induction) Motor than runs a generator needed for electrical tests. We are trying to improve the energy efficiency of the set-up. The generator spends most of the time running idly and the motor has to keep running during this process to maintain the speed...

I run a 4.2 kw chinese diesel gene which has a 15 ùF capacitor on it. This capacitor keeps blowing up regularly. It cost 18Au$ to replace each time and the city is 100km away... Obviously it does 'nt like my big 2.4 kw grinder or my MIG welder (though the 10hp engine and 4.2 kw gene can handle...

Where do the electrons that electromagnetic induction mobilizes come from? If electrons are waves as the double-slit experiment demonstrates, couldn't they be generated just as mechanical and light waves are generated?

Homework Statement Hello everyone. I am doing a project where I have built a bicycle generator. We have everything set up and the alternator is putting out approx 45 amps and we also have a 12V car battery. My issue is that we need to write a short paper on the mathematics behind this...

hey all, i recently had an idea to combine the concepts of a magnetic bearing i.e. using the repulsion of magnets to lift a rotating object so that the object may rotate without mechanical friction , as well as an axial-flux alternator where coils of wire are exposed to a regularly fluctuating...

My research involves using a detector that I am trying to test with a pre-experimental setup. To test the functionality of the detector, I am pulsing a light source near the detector using a Picosecond Pulse Labs pulse generator. Here is where my troubles/question comes in: the pulser is...

I was just thinking that if you set something spinning in space it keeps turning, so does this mean once you started an electrical generator turning would you get ‘free’ energy?? Will the force from the magnetic field eventually case the wire to stop spinning?

In a recent discussion the output of a single-phase permanent magnet alternator was the topic. The alternator has a 6-pole rotor and 8 coils in series wound on 4 cores. Output is taken from the opposite ends of the series wound stator. Another fellow made the statement that with the...

I recently bought a hand-crank phone charger. When I opened it up, it looks like the generator is simply a repurposed electric motor. I have not yet tried to flow current through it to see it if would spin. However, I wonder how similar a motor is to a generator. I have heard of electric cars...

I will buy an electric bicycle in a couple of months and want to modify it. I will install a motor that has a max rating of 6,000 watts - common use is about 3k watts. I am also looking for a small, lightweight gasoline engine to connect to another motor - to make a small generator - so that I...

Let's begin. I have been assigned to build a homopolar generator, but I really don't know where to start. I searched the net for some info, but I couldn't find anything useful (for me). I tried to read and understand the wiki-page about this faraday disc, but it's kind of hard to understand...