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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DC excitation for generator
So i am spinning this generator to make variable frequency 3 phase AC. The exciter supply blew up this morning. The supply was a rectified single phase AC at 12vDC 40A DC. I am confused as to what the ...
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5answers
475 views
Does the electrical load on a generator affect its mechanical resistance?
If you take as an example the alternator on a car. Say the engine is set to idle at 1000 rpm. The resistance of the engine itself and any accessories it is driving require a certain amount of gas to ...
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26 views
Washing machine / microwave motor - AC or DC
If I take an old washing machine motor and try to convert it into a generator would it work and if so would it generate AC or DC? Same question with a microwave motor. I know it uses permanent magnets ...
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31 views
Effects of insulation on sphere of van der Graaf generator
Are there any notable reasons why one should avoid insulating the dome/sphere of a van der Graaf generator?
All the ones I have seen have been shiny metal but I'm pretty sure that they have been ...
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7 views
Off grid home power shutting off [migrated]
let me start by saying thank you for reading my question. I appreciate any help offered.
My husband and I just moved to Arizona from Ohio. We purchased a modular home off grid in the mountains. This ...
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1answer
43 views
Produce current
Ok, so I was trying our an experiment to generate minute current. I got a battery operated gear motor which can produce current to light ant led bulb when rotated. I am trying to create an automation ...
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1answer
92 views
DC generator without permanent magnets
I have heard that there are DC generators where resistance can be regulated by using electro-magnetic field. Where permanent magnets are substituted with electro-magnets. Are this kind of generator ...
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2answers
71 views
Is it possible to convert a low frequency signal into a higher frequency signal?
I have a signal generator that has an adjustable frequency range that is below the required frequency that I need.
Is it possible to input a signal from my generator into a passive series RLC filter ...
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2answers
69 views
What determines the amount of current that can be drawn from a generator?
I tried searching this site and the internet for answers to my questions but found only partial answers.
I am experimenting with generator design. I am using only one pole of the magnet so as to get ...
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49 views
Need suggestion about voltage divider values and the place of the RC filter in an opAmp circuit?
I'm trying to finalize this circuit above before the test day. This is the last configuration after updates. I started to ask about another issue about this circuit, but with the suggestions of ...
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1answer
56 views
BLDC generator output current
I'm using the following BLDC motor as part of a project to generate power:
http://www.rcdude.com/Cobra-C-3520-18-Brushless-Motor-p/c-3520-18.htm
I'm able to spin this motor to about 3000 RPMS which ...
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3answers
69 views
Use a microwave motor to power LEDs
I have an AC motor that came from a microwave turntable on the back it says 120v 2w 6rpm. I would like to use it as means to generate some electricity. I have a full wave bridge rectifier to convert ...
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32 views
Wind power charge controller
I have one of these motors that i want to use as a wind turbine generator.
http://www.ebay.com/itm/181392138415?_trksid=p2057872.m2749.l2648&ssPageName=STRK%3AMEBIDX%3AIT
I want my setup to be ...
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31 views
connecting a generator with an RCCB to a service panel
Consider the following schematic :
simulate this circuit – Schematic created using CircuitLab
in this setup we have two power sources Main power lines and a diesel generator ( with ...
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2answers
119 views
How AC current is distributed to our homes?
I apologize in advance if this is a basic or a silly question. When an AC current is generated by a motor,the current is generated in the loop that is rotating in magnetic field. The current direction ...
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2answers
83 views
Converting a DC motor to a generator
Can ANY DC motor become a generator if torque is applied to the shaft?
example:
Produce-Electricity-from-a-DC-Motor
And by any, I mean the really cheap ones too.
Or is there a specific type of motor ...
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4answers
78 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 ...
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2answers
73 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 ...
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3answers
194 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 ...
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5answers
218 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
39 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
44 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
106 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
58 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
39 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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28 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 ...
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2answers
107 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
79 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
43 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
76 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 ...
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0answers
83 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 ...
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2answers
68 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
43 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
97 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 ...
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2answers
54 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
106 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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0answers
61 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, ...
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1answer
65 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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2answers
174 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
54 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
30 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
79 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
53 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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2answers
349 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
133 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
94 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
67 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
360 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
90 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
72 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 ...
