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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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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319 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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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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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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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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679 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
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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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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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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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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
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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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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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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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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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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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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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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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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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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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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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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
531 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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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
669 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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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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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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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
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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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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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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 ...
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Alternator with torque proportional to angular velocity

Im interested in buying or designing an alternator/electrical generator that increases torque as rpms increase - is there an alternator design that increases resistance as rpm/angular velocity ...
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4answers
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Blinking an LED using a generator as the source of electricity

I made a little windmill which is turning a small generator to light up an LED, but the voltage is too low even with high wind speed for the LED to glow. I thought maybe the electricity could be ...
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why cannot generators having different frequencies supply in the same transmission line?

I am thinking of the issue that the TEPCO electric transmission networks cannot be taken over by other electric companies because of frequency difference. TEPCO is the electric company ...
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1answer
601 views

frequency generator / counter

I want to generate a precise frequency in the 500MHz range, and have therefore purchased a VCO (200MHz to 400MHz). To measure the VCO output frequency, I'm trying to build a high frequency counter up ...
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1answer
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How does a gas grill starter spark work?

On some gas grills, there is a button you push which creates a spark to ignite the gas (propane, natural gas etc.) My questions are probably pretty simple: How does the button create the spark? ...
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358 views

Frequency Transmitter

I was wondering if anyone had any site or diagram for a cheap (and preferably small) for a circuit for a 60 to 80khz frequency generator.
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592 views

Multiple crystals

I am building clock with ultimate precision. There are few known ways to improve precision: temperature controlled environment and multiple crystals. I am implementing both. I was going to use 5 ...
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450 views

Generating electricity with wet newspapers?

For a project we're thinking of generating electricity out of wet newspapers. Is that possible? How much current would it generate?
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Alternative Energy Storage

Can anyone suggest an alternative to energy from a battery? I'd like a system to replace my deep cycle leisure battery, I currently use this 110 AH leisure battery with a 1200W inverter. I run my ...
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What's a good square wave generator?

What's a good circuit to use to generate a square wave? The exact waveform isn't too important - I just want to get a piezo buzzer cranking at 150 kHz. I also want efficiency and adjustable amplitude. ...
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Hand Powered Generator

I'm interested in a hand powered generator similar to the one in this Gakken Helicopter Kit. Are these easy to come by? Easy to make?

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