Generator Definition and 1000 Threads

I was wondering whether there was any literature on brushed DC motors used as a generator or whether you know anything of the sort? I know that DC motors behave differently when used as a generator instead of a motor. However I have not been able to find anything about it so I was wondering...

...build a generator that uses renewable energy, what type of energy would you invest in?

Suppose we have [J_i,J_j] = \sum_k \epsilon_{ijk} J_k and [L_i,L_j] = \sum_k \epsilon_{ijk} L_k 1st question, I am right in thinking that J represents Eingavalues for spin 1/2 particles... next... Computing the commutation relations, I find that \sum_k \epsilon_{ijk} (J_K + L_K - L_k -...

Hi, I am thinking to use a 100c 8hp motorbike engine to rotate a 2KW generator which must be turned at 1500rpm. I thought of setting the bike engine to 2200rpm on no load so that when I put the generator on full load, the rpm hopefully will not go under 1500rpm. So what I want to know is, if...

If I had a black liquid that was thin, and I had a transparent liquid that was just lighter than the black liquid but didn't mix with the black liquid, and I put them in a dish out in the sun would the black liquid absorb the photons causing it to heat up and rise during the day, and cool down...

Homework Statement For an AC generator, my teacher told us that when turning it, you will slowly manage to turn it at a constant speed only because of the induced current causing a force in the other direction to the turning motion. Why is this so? For a DC motor, my teacher told us that after...

I have only recently found out about this idea (many thanks m.e.t.a.) and I am curious about it. Could it be used to produce electricity on a mass scale, and if not, why not? Is the efficiency of conversion from gravitational potential energy into electric potential energy less that the...

Hi all! I'm studying electrical generators, and while I was trying to come up to the expression of EMF induced in a conductor I got two different results following two different ways, and I can't find the error. With sinusoidal B, with e=bvl I get an RMS value E=2K_{f}f\phi, while with...

Hi. I'm working with this, so I should actually know this already, but... :P I'm just not sure how this actually works. Googled a little and found this forum with a good thread https://www.physicsforums.com/showthread.php?p=3973084 But for me, this is too much math. Can someone explain...

Hello this is my first post, please let me know if I'm breaking any rules, I'm still a bit hazy on them. I am in the process of making a permanent magnet induction generator from and old washing machine induction motor. The motor is rated 1725 rmp, 115 volts 6.3 amps at 1/3 horsepower. It is...

finding the "energy balance" of a hydroelectric power generator I proposed a new hydroelectric energy idea to somebody and they asked me for a "energy balance". I know nothing about physics or anything relevant to calculating something like this. If somebody asked you for the energy balance of...

First, I am not an electrical engineer - I am a hobbyist building a prototype linear-stlye generator based on an idea I had which, for various reasons, cannot be built with magnets that pass completely inside of coil(s) like most of the ones I have seen described for wave energy capture and...

Hello everyone, I found on this website http://spiff.rit.edu/classes/phys213/lectures/lenz/lenz_long.html a very good explanation for AC generators. Particularly I am considering these two images: And I found those equations and graphs are quite interesting and wish to make a...

I ran into the following page http://www.yourrenewable-energies.com/honeywell-wind-turbine-6500/technical-specifications a while back, and was wondering if this is just a special case of a linear generator, i.e., where magnets move past fixed coils to generate electricity rather than the more...

So I have been trying to figure out the actual advantages that a 3 phase generator has over a 1 phase generator. I have been trying to find a mathimatical proof as to why 3 phase is more efficient. I have looked everywhere and have not been able to find an answer. I know how to prove that 3...

I'm not sure whether to post here or EE forum, if it is better suited there, please advise/assist in moving it. I'm familiar enough with Induction, though not practiced in the formulae describing it. I recently came into need of an AC generator and thought there has to be some useful...

Hi to all, I have generator 3500watts (Made in China). it has pull start with rope. and i want alternate start with self start...! i hope you understand what i am talking about. Thanks in advance. what accessories or tools required? how to do? how it works? guys i am not engineer...

We consider a superfield \Phi\left(x^{\mu}, \theta_{\alpha}\right). For a small variation \delta \Phi = \bar{\epsilon} Q \Phi where the supercharge Q_{\alpha} is given by: Q_{\alpha}=\frac{\partial}{\partial \bar{\theta}^{\alpha}}-\left(\gamma^{\mu} \theta \right) _{\alpha} \partial _{\mu}...

Homework Statement Hello, let me introduce myself first. I am Wira, a Senior High School alumnus in Indonesia. I am currently preparing for my university entrance exam. This is a problem which I get stuck in, and can you help me with it? Indonesian: Suatu mesin kalor yang bekerja dengan siklus...

Hi , i am a high school student ( class 10 ) and after reading about electromagnetic induction iwas thinking about what if u place a wire coil connected to a circuit in the magnetic field / near a generator ? Because electricity is turned of for a fraction of a second there will be great...

Does anyone have a lab bench function generator that they really like? I'm going to be buying one, and was curious if anyone had any opinions on which one is nice or if they bought one and thought it was a piece of junk. I don't really care about specs, more just which ones you prefer to use.

Anyone want Paul Kolac's ball lightning generator? NOTE: The existence of "ball lightning" is well accepted by some scientific communities, notably submarine engineers (because it has been seen near batteries inside submarines, though reproduction outside submarines has been problematic), and...

Attached is my attempt at a proof. Please critque! :shy: Thank you!

Hi guys, I need a signal generator that can provide frequencies up to 1kHz and also can deliver up to 10Amps. Any suggestions or recommendations? cheers

Hi guys I am not sure if this is the right forum, so please feel free to move this topic around to where it belongs. This is not homework help, but something I have been wondering about lately. Anyway. I am wondering about som differences between VAr Import and reverse power for...

Hello everyone! This is my first time posting here and I hope I can make a good first impression, and I apologize for the lack of links because of this being my first post. Currently I am working on a project for my grandfather's engineering business, and part of this project is designing a...

Hi there, I have recently downloaded this document on magnetic generators. I would just like to confirm a most probably very standard thing. One of the generators discussed is a 2.5 kW at approx 250 rpm. To confirm, is the 2.5 kW delivered per minute or per second at the rated speed?

A VDGG is used to produce a large PD. The dome of the generator has a radios of 0.15m. It is charged and gets a PD between the dome and the Earth of 75kV. The charged stored on it is : 5.0 x 10-6C Answer: Use of E = Q/4∏εr0. 3.0 x 105 My attempt: E = kQ/r2 = 8.99 x 109 x 5.0 x 10-6 /...

suppose a magnet and a coil are made to rotate in the opposite direction relative to each other, will this result in a higher voltage at a rpm as against the stationary coil and moving magnet configuration at the same rpm ? i've also attached a figure to illustrate the configuration...

What I am looking for is a cheap, lightweight way to generate a range of specific frequencies. To expand a little, a microwave uses a constant frequency but may vary its power to cook the food. I've heard it tries to match the resonant frequency of the water molecule in order to agitate it...

Hello. I am attempting to design a generator that works with the (admittitedly) inefficent design or rotating a conductive material inside a magnetic field to produce current flow. I could use help finding the formulas I need to calculate the amount of spin and size of coils i will need to...

I am supposed to discuss the benefits of having high number of magnetic poles in ac generators with constant frequency. From formula it is obvious that the higher number of poles the lower the speed of rotation. But is there anything else, or what is the benefit of lower speed? The only...

Greetings, According to Faraday, a single phase generator ideal output voltage is: V = N*A*2PI*RPM/60*B Then should a three phase be: V = N*A*2PI*RPM/60* B * SQRT(3) ? I'm trying to build a spreadsheet to get ballpark numbers for simple variable speed generator design, but having difficulty...

Over at the Airborne Wind Energy forums we are having a debate about the physics of a generator. The question was posed that if you could generate 1kw of power in the form of rotational torque at 2 different speeds, one begin half as fast as the other how much more would the generator weigh...

Hi I have to finish assignment due tomorrow for Physics but I'm really bad at physics so could someone explain to me very simply how does an a.c generator work and d.c battery ?

Just a quick question, if the maximum induced EMF of a generator is say 200v, would the minimum EMF be -200v or 0v? No equations necessary I say.

Is the resistance of the turning shaft equal in both cases where the output induction circuit is closed and broken. Or to put it another way, if the electrons are permitted to flow via induction does it make any difference to the magnetic resistance? I'm hoping and expect the answer is that it...

OK, I'm designing an Open Source Kite Ring Generator. See kitepowercoop.org for details. I have designed a system which uses a large inflated torus with kites attached radially around the axis on which it spins. I believe that removing the inside hub of a standard wind turbine by working in...

I recently acquired an older Wavetek 2500 signal generator (.4 - 1100 MHz) and HP 54100A 1 GHz Digitizing scope for a project and am having a difficult time in getting an accurate voltage reading using anything other than a direct-connect BNC cable, and even that seems to have it's issues...

I am a bit confuse on the back EMF waveform shape of the brushless permanent magnet machine. As I know brushless DC permanent magnet motor has a trapezoidal shape back EMF waveform. If I use this motor as a generator, do I still get the same waveform shape or I will get a sinusoidal waveform?

I wasn't sure where to post this, but I am a physics student working on a thesis and the experiment I ran involved using a function generator to generate a magnetic field (wire was bent into a loop). I am trying to figure out how to convert the frequency (15 MHz) and Vpp (10V) to current so I...

The title should be self explanatory, the only reason I ask this is because thermoelectric coolers are ridiculously cheap compared to a thermoelectric generator. Is there anything I need to check when using a cooler as a generator, I am expecting temperatures on the cold to be around 20C and...

Hallo everyone! I'd like to build a simple generator for a project. Like this picture here: http://www.interactives.co.uk/images/DSCN7717crr.JPG I have everything I need but one think keeps coming into mind... Mechanical resistance?(Not friction due to material's touching each other like...

I wasn't exactly sure whether this belongs in the mechanical or electrical section. /watch?v=VsGhllSgpLU&feature=related That was the video I saw that made me want to start a project. This would be my first, and I haven't taken physics or anything yet, so I don't know some a lot of things...

Hi, I am having difficulty understanding the following: \int^{2π}_{0}(x+y)\,dθ = \int^{2π}_{0} 2a\,dθ = \textbf{4}πa where x and y are the generator lines of an elipse, a is the semimajor axis and θ is the angle formed by x and the major axis. I understand that x+y = 2a. However I...

Hi, I am new to things involving electricity and electricity generation, and I have a question that I can't find an answer to and I was hoping that someone here might be able to help me. I would like to perform an experiment but I need some help before buying the items needed. I would like...

In the case of a power grid or generator failure, the former which chernobyl was testing for and the later which occurred at Fukushima - why can't you stay online, use the electricity your producing to power the pumps and sink the excess electricity into the ground? I have no engineering...

1.How to set the initial state of the Pseudo Random Sequence Generator? 2. I'm using 74LS74 D-flipflop.I'm unclear how to use clear and preset enable inputs to set the initial sequence. 3. I tried doing the experiment by directly giving the 0001 sequence through respective...

Hello, I am new to this site and thought I would give this a shot. All my experience is in low volatge DC circuits and don't have a whole lot of experience dealing with AC but I am trying to learn. My boss and I are working on an experimental generator with 24VDC input but AC output...

I am building a "Tiny Home" on an old camper travel trailer. I am using all recycled materials and any leftover building supplies I can find. I am going to use solar power to generate most of my electric power (lights, outlets, etc.). I am considering using a hybrid system and utilizing wind...