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

learn more… | top users | synonyms

0
votes
1answer
7 views

Converting a DC motor to a generator

Can ANY DC motor become a generator if torque is applied to the shaft? example: http://www.wikihow.com/Produce-Electricity-from-a-DC-Motor And by any, I mean the really cheap ones too. Or is there a ...
2
votes
4answers
56 views

What is capacitance required for this 3 phase rectifier

In the diagram above I want to know the value and the rating of the capacitor that should be used for good rectification The Line to Line voltage is 400 , and by relation Vdc =(3√2 VL)/pi=(3√2 x ...
1
vote
2answers
45 views

switching DC trolling motor to generator

Would like to drag the trolling motor prop while sailing to re-charge the battery. The trolling motor is 12 VDC and the max amps at full forward speed is 50. The sailing speed of the boat will turn ...
-1
votes
0answers
40 views

How do I calculate the size of the snubber capacitor needed across a DC commutator to clamp the transients? [on hold]

I have an old DC power supply of 40 volt and 40 amp capacity. I wish to send this energy into a mosfet switch, so need to clean up the transients generated by the brushes as they slide across the ...
1
vote
3answers
178 views

Why alternators are used to generate DC?

Why is it that to generate DC, it's often an alternator that's used? Couldn't commutator rings be added and do without AC-DC conversion? I'm asking because I wonder how efficient it usually is for a ...
3
votes
4answers
158 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). ...
0
votes
1answer
31 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 ...
0
votes
3answers
43 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, ...
0
votes
3answers
82 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 ...
1
vote
1answer
55 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 ...
0
votes
2answers
28 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 ...
0
votes
0answers
21 views

Short circuit transients in synchronous generators

When the three terminals of generator are suddenly shorted out the short circuit fault current has both ac & dc component. i am guessing that this as inductor current can not change ...
0
votes
2answers
61 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. ...
1
vote
1answer
69 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 ...
0
votes
1answer
37 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 ...
0
votes
1answer
58 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 ...
1
vote
0answers
52 views

What is ment by front and back pitch of an armature winding?

I searched the internet for these definitions and found a common definition in all websites: Back Pitch- A coil advances on the back of the armature. This advancement is measured in terms of ...
1
vote
2answers
58 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 ...
0
votes
1answer
41 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 ...
0
votes
0answers
38 views

Why is Potier method more accurate?

Why is the Potier method more accurate than the synchronous impedance method or ampere turn method for determining the voltage regulation of a synchronous generator?
-1
votes
2answers
90 views

Power efficiency on mini hydro generation

Here is the generator I intend to use on my project which I obtained from this site. Could you help me to get a tip/direction on how to start the calculation for this. I search some (might be ...
2
votes
2answers
46 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 ...
0
votes
1answer
88 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 ...
0
votes
0answers
43 views

Alternator stator wiring configurations

I have a 3 phase generator with the stator wired in series star. I wish to know whether I can change this configuration since the manual contains the configurations shown in the image above. Also, ...
0
votes
0answers
33 views

How to convert a BLDC motor to a generator?

I want to convert an electric bicycle's brushless DC motor hub to a generator, in order to convert mechanical energy to electrical energy. How can i do that? taking into account that most BLDCs have ...
0
votes
1answer
54 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 ...
2
votes
2answers
150 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. ...
0
votes
1answer
51 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 ...
0
votes
1answer
29 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 ...
0
votes
2answers
72 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 ...
-2
votes
1answer
49 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 ...
3
votes
2answers
236 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 ...
0
votes
3answers
117 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 ...
1
vote
1answer
77 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 ...
0
votes
1answer
65 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 ...
0
votes
1answer
200 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 ...
2
votes
1answer
79 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 ...
1
vote
1answer
65 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 ...
0
votes
0answers
13 views

calculation of ramping rate of user-defined generator model

I want to calculate the ramping rate of my self-defined generator model. How could I realize this by simulation! Thanks very much!
1
vote
1answer
52 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 ...
1
vote
2answers
327 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 ...
0
votes
0answers
42 views

Generator load capacity

Good day to all. We have Ac synchronous generator 3phase 270kw 450V but when we load it by about 100kw the voltage reading goes down to 390 volts but the frequency is still 60 hz we tried to replace ...
0
votes
1answer
98 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: ...
1
vote
1answer
85 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 ...
0
votes
0answers
56 views

How does a Generator creates electricity

I am a freshmen student of marine engineering. I am wondering how does a generator generates electricity? And in what kind of current is it AC or DC?
1
vote
0answers
115 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 ...
1
vote
1answer
171 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
votes
1answer
135 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, ...
0
votes
1answer
85 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 ...
1
vote
3answers
594 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