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Questions tagged [generator]

A generator is a device that generates electricity from mechanical energy via different energy sources such as heat or kinetic energy of water.

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3answers
854 views

ways to generate (small amounts of) electricity

I'm searching into ways of generating very small amounts of electricity, by small I mean enough to light a couple of leds, nothing more The main idea is to have toys that my daughters (2 and 4) can ...
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973 views

Sawtooth generator not working - transistor won't discharge my capacitor

I have been trying to build a sawtooth generator using a current source which linearly charges my capacitor and a comparator which was supposed to discharge my capacitor; instead it doesn't. Here is ...
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1answer
1k views

Solid State Switch for magnet DC Generator

I'm using a flywheel-driven permanent magnet DC generator to charge up a bank of supercapacitors, 35 farad rated to 25V. For safety I limit the max charge to 22V via a comparator and a zener ...
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2answers
6k views

Hendershot generator w/unpolorized capacitors [closed]

does the Hendershot fueless generator work?
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1answer
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Building a new dynamo bike light

So here is the deal, for the 2nd time in less than a year, my halogen bike light on the front has popped due to cold. This is rather bothersome and I can't find any nice inexpensive LED alternatives ...
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1answer
851 views

Simple generator to light a series of LEDs question

Playing around with a simple circuit idea with friends but none of us have really worked with circuits since college so we need a little guidance. The thought is to have a small generator (someone ...
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2answers
704 views

How to create a square wave signal with 120MHz

What is a cheap way to generate a square wave with a frequency of 120MHz. I've been thinking of the following solutions: Use a Raspberry Pi, then use a timer or something from that board Use an ...
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1answer
297 views

Electrical Generator Windings - Is there an “ideal” way to wind?

I've got a question that's been bugging me for a while. Is there a "best" way to position a magnet and wire coil inside a generator? I saw a "how-to" on how to build a wind power plant and they had ...
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1answer
170 views

What is this equipment called?

In this video at 0:40, what is the equipment he is using to power the motor? It seems to be some sort of torque leveraged device (forgive my ignorance). http://www.youtube.com/watch?feature=...
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2answers
260 views

How can I add white noise to a low-noise 2 Mhz sine signal from the signal generator?

I want to add a defined level of noise to a low-noise/exact signal generator which produces around 2 Mhz. I heard Zener diodes should be good for that job. But how can I get a defined level of noise ...
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1answer
4k views

What's the best method for generating 5V at 2A?

I'm trying to make a crank DC charger. I understand the voltage regulation circuitry and (if needed) the bridge rectifier circuitry, but I'm still a total noob. I'm wondering what is the best/...
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1answer
736 views

Help with grounding a generator on a running vehicle

Ok, this may be basic, but I can't seem to find a solid answer. If I have an AC generator in use on-board a running vehicle (that is being driven), is a GFCI enough or must some sort of grounding be ...
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Explanation for Differing Stator Winding Orientations

As a layperson, I'm trying to understand the basic configuration for an induction motor or generator. I've looked at many diagrams and photos/cutaways of stator wiring and I've noticed two different ...
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5answers
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What is the slip factor for an induction generator in an island network?

Most textbooks covering induction machines cover only the motor use-case scenario. When the machine is used as a motor, the slip factor is determined by the frequency of the stator current by the ...
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4answers
3k views

How to fake an encoder signal with one function generator?

I wish to be able to have a encoder quadrature signal that I could set the frequency to some specified values (from 10 to 60 Hz). I have a function gen that fulfills the freq requirements but it has ...
4
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1answer
205 views

Why not run high power truck-mounted electronics from the truck's engine?

At Burning Man, I see a lot of "art cars" based on internal combustion engine platforms using generators separate to the original vehicle's engine to power their LED displays and sound systems. Why ...
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4answers
433 views

How is electricity typically generated?

I am a pure physics guy, so I understand the fundamental processes behind the generation of electricity, but I'd like to know how to apply it. I was wondering what kind of methods were used in the ...
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2answers
34k views

Is it possible to use Kinetic energy to power small devices?

I've tried looking around for as much information as I could gather to build really small wearable electronics that could power themselves by generating energy with movement. I know that the ...
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1answer
13k views

Will a gas generator survive an EMP?

Not really sure where to ask this question. I was watching an episode of a TV show involving a gas generator and it got me wondering whether electricity could still be generated by a gas generator ...
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1answer
2k views

FEM: How to calculate impedance in stator circuit for loaded generator

I am modeling a synchronous generator and in the stator circuit consisting of 3 phases at the alternator output, I have resistances and inductances of the end windings. Thus I have a 3D approximation ...
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5answers
2k views

Hand crank DC generator - a simple dummy load that won't burn out?

I'm working on a project that allows a user to crank a hand generator while current and voltage sensors measure the output. After the user finishes cranking, software displays information about how ...
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4answers
318 views

For a vehicle, what is the most efficient way to store energy from various inputs?

Background For the past few years I have wanted to make some sort of recreational vehicle that runs on multiple-source renewable energy. For example, a kayak with a trolling motor that gets its ...
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2answers
214 views

Given a source of mechanical input, can an RC motor charge it's own battery without extra cicuitry involved?

Background I took my RC quadrotor to a windy field this weekend to fly it around. After the battery died, I retrieved it and while carrying it back home, I noticed that the wind was spinning the ...
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3answers
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How to get half frequency square wave from sin wave?

The task is to get such wave: I can get square wave from sin wave, but I have no idea how to make it half-frequency. Have some advices?
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3answers
740 views

Regulating a steam-powered model generator

In this age of questing for ever-more-efficient circuit designs, I have been presented with an anachronistic design problem: I need to keep a roughly constant load on a steam-powered turbine generator....
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2answers
631 views

How to divide signal level from function generator

I looked for this answer but was unsuccessful so I want to ask the experts here. I have configured an op amp in non-inverting mode (the first in a chain of 3 stages). It is for amplifying extremely ...
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1answer
3k views

Parallel Operation Problems

How do I set up a Woodward 2301A load sharing device when operating generators in parallel? Currently, when running two generators in parallel, the first generator takes too much load, and the second ...
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2answers
3k views

How do I modify a DC electric generator to get the same power at a lower speed?

This will be a theoretical question. Suppose that I have a DC generator, and I'm getting 300VA power from it when it rotates at 2000rpm. I want to make it run at a lower speed of about 700rpm, and I ...
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2answers
3k views

Which parts of this rotor can be made out of plastic?

I'm asked to redesign a rotor, by making as much parts of it as possible out of plastic. The issue is its weight, we want to make it as light as possible. Especially the shaft & axis of it is the ...
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2answers
2k views

3 phase vs 1 phase alternator

I have an automotive alternator, and would like to rewind it for higher voltage for wind power application. Since I am going to use it for Battery Charging, should rewinding it for single phase ...
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4answers
7k views

Putting far more mechanical energy into a generator than its electrical load

Funny how I was pondering about this question for a long part of the day yesterday, and today I was at stackoverflow and in the box with the featured questions from other SE sites this very related ...
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3answers
534 views

Will a 3 phase induction generator fight its own rotation?

So in a 3 phase induction generator with coils for the stator and magnets for on the rotor, I am wondering if the the current induced in the coils would create a magnetic field that would oppose the ...
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4answers
2k views

Is there a device that converts any AC frequency to 60 hz?

If I have something like a windmill generator that generates AC current, but at variable frequency, what device(s) would I need to convert that variable frequency into a constant 60hz frequency, so ...
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2answers
1k views

Alternation of Magnet Poles in DC and AC Generators

I want to create a generator. The current design I am looking at has several magnets along a wheel, with coils around the outside of the wheel. The wheel then spins generating current. I know that if ...
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4answers
4k views

Can I pedal power a laptop device while the device is being used?

I want to research how easy it would be to use a small laptop device while powering it by pedaling on a stationary frame. (For example, using a tablet on an exercise bike, or using a netbook while ...
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2answers
2k views

How to measure the “efficiency” of a generator?

I've built "linear generators" (a coil on a tube, with a free magnet inside), with different layouts and I want to measure which is one "is the best", or, at least, make some kind of profiling on them....
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2answers
4k views

why electric motor or alternator have stack of plates?

i have noticed that all of the transformer/motor/alternator/electric actuator have a stack of metal for stator ( or where winding is done. ). why is that needed ? can same thing not achieve by using a ...
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1answer
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Penalty Factor in Generator Dispatching

Can anyone please explain what is meant by penalty factor in generator dispatching (power systems)? I know this is used when we define the Lagrangian equation for non linear variable costs, but don't ...
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1answer
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Compact Fluorescent Lamp Load Calculations

I help build/wire up large illuminated carnival/parade floats, and in the past we have used around 11,000 40w/60w GLS BC light bulbs in festoon sockets, powered by a 800KVA 3 phase diesel generator. ...
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2answers
2k views

How does a wind turbine protect the bank from a reversal in polarity when spin direction is reversed?

This is a follow-up question to an answer to How does a wind farm prevent the fastest spinning turbine from driving the slowest one? Spinning a DC motor will generate electricity on it's terminals. ...
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2answers
988 views

How does a wind farm prevent the fastest spinning turbine from driving the slowest one?

Just what the title says. On a wind farm spread across several score hectares, I assume, the wind-speed wouldn't be uniform. The faster spinning turbines would probably induce more electricity than ...
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4answers
528 views

Will a faster rate of change of flux improve electricity generation?

From what I remember about electricity generation, a varying magnetic field is used, either the magnetic field or the coil moves to generate electricity. e = dB/dT where e = voltage induced B = ...
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2answers
15k views

Can I Test Bug Zapper's Voltage With Multimeter?

I have The Executioner bug zapper: Although it uses 2 AA 1.5v batteries, it also has voltage multiplier like Cockcroft–Walton generator i guess and would like to know if it is safe and would make ...
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4answers
664 views

Simplest 42.8 MHz generator

What is the simplest way of generating 42.8 [MHz] square (or sine) wave? I want to clock fast ADC for SDR purposes. I thought about wideband opamp and 10.7 [Mhz] cystal 4th harmonic. Is there any ...
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3answers
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Building an Ultrasound Generator

I need to generate ultrasound with a frequency of 1.5 MHz. The ultrasound should be pulsed as shown here An ultrasound pulse should be 200 µs long, a pause (no ultrasound) is 800 µs long. The desired ...
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6answers
35k views

What is back-emf: counter-electromotive force?

Could someone knowledgeable on the subject explain what exactly is this back emf? How is it caused in a motor/generator, which components and which effects determines it?
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5answers
388 views

Is direct current really better for pumped-storage hydroelectricity facilities?

Currently the article equivalent to War of the Currents in Russian Wikipedia section says that direct current is beneficial to pumped-storage hydroelectricity plants and provides no reference to that ...
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1answer
243 views

What could be this “transient electric deviation”?

On August 7th, 2011 a lightning hit a transformer powering one of Amazon EC2 facilities in Dublin. The status report said Normally, upon dropping the utility power provided by the transformer, ...
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3answers
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Harvesting energy from a small amount of wind

I am currently investigating the feasibility of a project that would include the need of harvesting some energy from wind. The size constant of the generator and fans is about 2"x2"x2". The end goal ...
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1answer
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A problem on synchronous generators

This is part of a problem of my past examination in Electric Machines. I don't know how to solve it yet. A salient pole synchronous generator \$ (X_q < X_d) \$ has a connected load at rated ...