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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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5answers
741 views

How to create pulses which are 10ns long and 15kV/ 80A amplitude?

I'm looking for an easy way to create short high voltage pulses. These would be 10-100 ns in duration, 10-30 kV in amplitude (the load is complex but roughly similar to a 200 ohm resistive load). ...
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1answer
299 views

3 Phase generator 300v

I've just been looking at purchasing a 3 phase generator for powering wood working machines in the UK. However while I have been looking I have come across generators which only have a voltage gauge ...
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3answers
428 views

Generate Power off of several motors at once

So in working on a project, I am considering generating power using several small 12V motors (made for DIY toy cars, very cheap on amazon) or by using one bigger electric scooter motor (24V, 250W, ...
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3answers
1k views

Charging AA Battery with DC Generator

I am trying to recharge AA Battery (rechargeable, 1.2v, 1000mah) with DC Generator which outputs around 3v to 5v. The input for DC Generator is from another 1.5v rechargeable battery with a step up ...
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1answer
88 views

Builing a frequency inverter chimera

Industrial frequency inverters (or "variable speed drives") can be thought in three parts: A mains rectifier, that converts two- or three phase input current to DC, a DC energy storage (large ...
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2answers
760 views

Minimal power circuit for recupating three phase motor drive on DC

A thee phase motor (like an asynchronous motor or an brushless DC motor) can be driven from DC power by using a half bridge on every of the three phases (for example by six FETs) if I'm right. What ...
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4answers
6k views

Charging lead acid battery using boost/buck converter

I plan on permanently connecting a 12v lead acid battery to my home made wind turbine (dc). I already have a dc-dc buck/boost converter so I wonder if i can use that to charge the battery. ...
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1answer
684 views

Charging ultracapacitors separately and using them in series for regen braking system

I am a mechanical engineer therefore please correct me if there is anything that I got wrong. I am working on a regenerative braking system for an IC motorcycle and I am looking for the best way to ...
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1answer
115 views

Self charging wood-gas camping stove using thermoelectric module/modules

Is it better to string 3 teg thermoelectric generator modules in series to charge 8 NiMH batteries at a current of around 700 mA Delta T of ~80 deg. C or should I use 1 module and try a voltage ...
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1answer
951 views

White noise generator transistor voltage question

I have a very newbie question. Here is a white noise generator schematic I'm using (from http://montalk.net/emwng.html) It all works fine. What I want to understand is why this works at 9V (and down ...
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2answers
317 views

Generate electricity, water wheel

I have a stream of water, it flows at 1 gallon per minute into a water wheel. The water wheel produces about 75lbs of torque. How much electricity can I make with this? Where can I get more info on ...
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1answer
125 views

Magnetic attraction/repulsion with motor/generator and similar systems?

With generators and motors, is there a form of magnetic attraction or repulsion between the conductive element(rotor/solenoid) and the magnet's magnetic fields? If so, what formula would be best to ...
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2answers
179 views

Power efficiency on mini hydro generation

Here is the generator I intend to use on my project which I obtained from this site. generator http://www.seeedstudio.com/depot/images/mhg_LRG_01.jpg Could you help me to get a tip/direction on ...
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2answers
689 views

Moving the magnetic field around a fixed conductor?

From this figure: And many others related to electromagnetic induction, the main component of motion would be the conductor perpendicular to a magnetic field. I know it's possible to have it the ...
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1answer
4k views

why the stator frame of a 3-phase generator is made up of cast iron?

I don't have a good knowledge of engineering materials, so please answer the following questions with reasons. Why is the stator frame of a 3-phase generator made up of cast iron? Why is the ...
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1answer
660 views

Lorentz force opposing mechanical input to a generator?

When comparing between an electric motor, and a generator. I find them being quite similar. I can use and motor as a generator and vice versa. What's confusing is the principle, the Lorentz force ...
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4answers
4k views

Power factor correction for LED lighting on a generator

I'm the electrician for a club that builds an illuminated carnival parade float, and historically we've lit our float using around 10,000 x 40w incandesant lamps powered by a 800kVA 3 phase generator. ...
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1answer
1k views

driving a synchronous motor as a generator

Say I have a 100 kW synchronous motor in a building driving a pump/fan etc as part of an HVAC system. 1 - if I drive the shaft of the motor at 100 KW (from somewhere else), then the load on the ...
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1answer
231 views

Slipping a pole pitch?

Can someone explain to me what slipping a pole pitch means in regards to generators? The following paragraph is from some class notes I was revising: 'A generator could lose synchronism with the ...
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2answers
381 views

Auto load limiter reverse power problem

Our generator is connected to grid by 33kv line. Due to some reason we supply a fixed amount of power to grid. This is done by a device named Auto Load Limiter Device which looks like It measures ...
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1answer
379 views

Thermo energy. How does it work and how can i do it!? :D

I see youtube videos where people use heat from their hands and other places on metal to create energy. But most of the time there's a cold side. How does all this work and how could i make a simple ...
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3answers
15k views

How to synchronize a generator on the electrical grid?

I've read many articles about paralleling two portable generators or synchronizing a power generator on the electrical grid. I have the theoretical background about that topic and I know the four ...
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3answers
910 views

BPM Generator with display?

Trying to figure out how to design this with decent precision but having trouble getting this started. I've worked with 555's before but not for precise counting that can be modified in steps. I'm ...
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1answer
570 views

Phasor Measurement Unit (PMU) vs Synchro-check Relay

What is the difference between a Phasor Measurement Unit (PMU) and a Synchro-check relay? I need to know if Synchro-check relay can be used as replacement for PMU in a Synchrophasor data system. We ...
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1answer
86 views

Creating electricity from heat

I want to build an alarm for my soldering iron that goes off if it is hot for too long. Rather than rely on batteries I am wondering if it is possible to generate enough power from the heat of the ...
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1answer
6k views

Difference between nominal speed and idle RPM of a DC generator

I am currently studying for a electrical engineering related exam and came across this problem. What exactly is the difference between the nominal and idle RPM of a DC generator, and which one is ...
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1answer
744 views

Why is there a different load current in two identical DC generators in parallel operation?

I am a university student. While we were performing the experiment of parallel operation of two DC generators, we noticed that the load shared by the two generators was different. The total load ...
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1answer
255 views

Does a Wimshurst machine work fine with normal glass disks?

I want to build my own Wimshurst machine and I cannot find plexiglass disks. However, in our town there is somebody that cuts normal glass circles–so I wonder if normal glass disks would replace ...
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1answer
104 views

Home Generator Excess Electricity

I have a electric generator in my house which runs on petrol fuel and normally it takes 1 liter for running for 1 hour. It doesn't matter if I light up whole house or only single bulb when it runs for ...
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2answers
1k views

Signal generator: PWM or R2R?

I want to build a signal generator using a ATmega 328P on an Arduino. Which way would be better. Using one of the timers (8bit or 16bit) built in to generate a PWM and then low-pass filter it, or ...
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2answers
974 views

Using Electric Motor/Generator Instead of Inverter to Deliver AC Mains from Batteries / Solar

I am exploring/researching Solar PV systems and the possibility of setting up a solar installation company. DC/AC inverters are very expensive and I am trying to find a cheaper solution. Question: ...
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1answer
336 views

Is my dynamo a BLDC generator or PMSM generator?

I want to ask you about a problem please. I have bought an AC dynamo generator (the commercial name). First I don't know is it an AC synchronous generator or a BLDC generator. The dynamo has 12 ...
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0answers
420 views

Draw relation of rotation speed and output power of PMAC generator with brake resistor

I would like to draw a graph showing the relationship between rotation speed and power of an ideal Sinus PMAC generator with a brake resistor R(load) to be defined controlled via a 4Q Controller ...
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1answer
347 views

Phase Sequencer

I have 3 phase voltages entering into my PIC ADC (3 different channels ) through a voltage down scaling circuit and I have successfully calculated their rms values inside my controller.Know I want to ...
2
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1answer
898 views

Square generator 1KHz to 1MHz with 1KHz precision

I would like to make a square wave generator which will output a signal with amplitude X voltages and frequency between 1KHz to 1MHz, with the precision of 1KHz (for example: 785kHz, 926kHz, 999kHz, ...
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1answer
9k views

trying to increase current output of a generator

this is my first time posting here also I'm very new to electrical engineering. i am building a pull cord (like a lawn mower) human powered generator and I'm looking for ways to increase the current ...
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3answers
4k views

What happens to unused power in generators

I have a 7KVA generator which i use for multi-purpose. Some times i run AC on it and some times not. Will the generator consume less fuel when i utilize less power generated from it? Thanks
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2answers
3k views

Which of the following motors best suit as a wind generator? [closed]

I'm watching some brushless outrunners with low kv as a generator for a simple wind turbine that I'm going to build soon. It might not be a scale or fully useful turbine, because I want to build it ...
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1answer
1k views

RD-ZD-25F, 220V/50W motor as a generator

I have 2 RD-ZD-25F, 220V/50W DC motors from 2 broken bread-making machines. Can they be used as a generator? I gave one with the hand few spins and I got a little bit of a shock from it. Thanks PS: ...
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2answers
464 views

Factors determining number of turns in field winding of Sychronous generator

the question is simple, based on what factors do I choose the right number of turns in field winding (for synchronous generator)? It seems like the less turns there are, the more DC current is needed ...
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1answer
596 views

Simultaneous operation of inverter and diesel generator in a solar system

I have a problem at one of my on-grid solar system project. There is a problem which lets the solar inverter on, when the grid is off and the diesel generator is on. As you know that, the solar ...
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2answers
165 views

What makes an arbitrary waveform generator arbitrary?

Why are some signal or waveform generators called "Arbitrary Waveform Generators"? Am I misunderstanding the word arbitrary? This question is not necessarily about the word arbitrary but more about ...
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1answer
134 views

Summer camp project questions - bike charger

For a summer camp, I am building a bike-generator. Well I have found a few articles about that on the internet, but I have put together a list of questions and I would be really appreciated if someone ...
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1answer
547 views

Triangle Wave Generation

What would be the best way to generate a triangle wave that can operate at 250kHz @ 4V peak-to-peak? I have tried the following circuit: However, the best I could obtain was a 4mV peak to peak ...
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2answers
1k views

Synchronous Generator Resistive Load Characteristics?

I have a permanent magnet synchronous machine (PMSM) that I intend to run as a generator. I'd like to test its load characteristics under resistive load. The PMSM is Y-connected. Assuming Y-connected ...
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1answer
166 views

Diesel generator set [duplicate]

When a 250 KVA DG set with four wire out put (3 phases and one neutral wireis working on full load with 0.8 pf lagging, it will deliver 347.8 A which is the rated current.Then what will be the current ...
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2answers
3k views

Rated current of a three phase DG set

When the rated current of a 250 KVA DG set is shown as 347.8 A, does it mean that it is the line current or phase current or sum of currents on all phases say R Y B phases
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1answer
829 views

Why aren't vehicle mounted generators grounded?

To clarify, I'm thinking specifically of PTO-driven generators on fire apparatus. It would seem that they are grounded (Earth ground - not floating) when connected to a hydrant and their hoses are ...
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1answer
1k views

Most efficient generator for charging 12 V batteries

I have a Honda GX25 mini 4-stroke engine that I want to built a battery charging generator for 12 V lead acid batteries. My first idea was to use an old car alternator as the generator part, but now ...
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1answer
5k views

Line Voltage of a three-phase star-connected generator

"If the phase voltage of a three three-phase star-connected generator is 200 V, what will be the line voltages: a) when the phases are correctly connected b) when the connections to one of the ...