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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Super capacitor vs. battery

I've made a turn signal system for my bicycle that uses power generated from the wheel. The wheel puts out 0-9v and is irregular depending on the speed. My lights take 3v, originally from two 1.5v ...
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44 views

Charging a 12V battery bank while using it

I have (4) 12V 190 Ah AGM batteries connected in series. I want to run a portable A/C unit through a 2000 watt inverter connected to those batteries and charge the batteries simultaniously with a ...
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Electricity transfer basics [closed]

First off, I'm sorry if this is something that's been covered before. I tried scrubbing the internet but can't quite find an answer to my questions. I have o my a very remedial amount of electric ...
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40 views

wide range ultrasound generator [closed]

i want design a wide range ultrasound generator from 20~100 Kilohertz what transducer can do in this range? the generator must control with volume that change the output frequency this means that we ...
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1answer
27 views

Confirm AC generator output frequency calculation

I am working on a project to build a small generator based on a 12 magnet, 12 pole, (6 pole pair) rotor with shaft speed of 2800 RPM. (Output voltage, 240 V AC, 4 kW.) Estimated load will be 3.5 kW,...
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45 views

Alternator power factor on load and its effect on output power

Almost all alternator manufacturers test the alternator at 0.8 power factor. But when installed at a site for power generation, the working power factor will be around 0.9 to 0.95, due to the power ...
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1answer
34 views

Inverter Generator Watt Question

I'm not sure how to search this so hopefully someone will answer. I'm rigging a floundering boat for my son and want to use LED light bars on the front and sides. I want to power then with an inverter ...
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1answer
40 views

How do charge controllers work?

I am creating a small wind turbine, I will be using a stepper as a low-efficiency generator. I have found off-the-shelf "wind charge controllers" but would rather roll my own because I would enjoy the ...
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79 views

Electrical Load increase on Generator = More Fuel Consumption

Why does more electrical current drawn from generator leads to more fuel consumption? I understand that it's due to conservation of energy, I just want to know what the phenomenon or reaction is ...
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151 views

How do power stations maintain 50 hertz?

In the UK our mains standard is 230v AC at 50 hertz. So I understand that the generators at the power stations need to spin at exactly 3000rpm. This is true no matter what source is (nuclear, coal, ...
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26 views

two half cylinders as generator stators

I'm really not an expert in electrical engineering, but I hope someone can help me out with my problem. For a school project I have to design a small wind turbine, which is portable and can be ...
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1answer
25 views

wanting to know the equations for calculating the output of a generator that has a static input

There is a variable speed generator that is 100% efficient. It has a 2 ft. diameter pulley attached to its shaft. There is 100 ft. of cable attached to the pulley and a 1000 lb. "static" force ...
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44 views

Can a generator have the coil oriented around the rotational axis?

I see a lot of examples of simple science fair generators with the coil axis perpendicular to the rotational axis of the magnets. I have made one with the coil wrapped around the axis of rotation, but ...
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Synchronous generator mechanical characteristic

Why does the synchronous generator produce a torque just in correspondence of the synchronous speed, that is why is he mechanical characteristic just a straight vertical line in \$\omega = \omega_S\$ ...
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73 views

Usage of RC oscilators [closed]

Hello everyone I am looking for usage of RC oscilators but sadly I cannot find them anywhere. That is why I decided to post there my question. Please provide an answer for all future users of this ...
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3answers
105 views

Hydropower formula:

If I had a 10 kW hydro electric generator (including turbine drive), what formula would I use to calculate how much water per second would need to be pumped into the turbine at 700 kpa to generate the ...
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2answers
1k views

What kind of generator do i need to run a 1.5 or 2 ton Air Conditioner? [closed]

I am planning to purchase a single AC that would operate on my Diesel generator. My Generator is a 5kVA , 8 HP air cooled one. I want to know that If I have to run only one AC on the generator shall I ...
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1answer
38 views

High Torque DC Motor

I am trying to use a high torque dc motor with gears to drive a low torque dc motor but with higher rpm. Is there a relationship between the current draw of a DC motor with the torque? I have seen a ...
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1answer
56 views

What does a power factor of a generator means?

When I was reading the nameplate of a small 5KVA generator, I found that the power factor is mentioned. It was 0.8 . Is this the minimum power factor that the generator can handle? or Is it the ...
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1answer
19 views

How to calculate resistor needed between generator and bridge rectifier?

I am almost done with constructing my railgun however, I am stuck with this last problem. To charge my 110 V 35 mF capacitors, I am converting 120 V 30 amp AC current from a generator to a 120 V 10 ...
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1answer
73 views

How to change the frequency of this sawtooth generator circuit?

I've found the circuit below in "The Art of Electronics" book. This circuit generates sawtooth signal. This is some of what is written about it: By using a current source to charge the timing ...
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1answer
37 views

generator impedance and resistance

If i have a generator with a reactive component and resistive component are these in series of parallel? and When considering the impedance of a transmission line, should the impedance from the ...
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2answers
41 views

Limit voltage/current of bridge rectifier

Assume I have a small bicycle generator which usually feeds the front and back LED/light bulbs. Powering a small gadget from this generator should well be possible. The setup would involve a full-...
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4answers
539 views

555-timer circuit supposed to give 50% duty cycle square wave doesn't

I wanted to build a circuit that gives 50%-duty-cycle square wave. I built the circuit of figure 4.4.6 from this link which is shown below: I used the NE555 chip, and used a potentiometer instead ...
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2answers
134 views

Synchronizing a diesel generator with a pure sine wave inverter

As the title reads, I'm trying to understand the best (Practical) way to synchronize a diesel generator with a pure sine wave inverter, in order to implement an automatic synchronizer based on ...
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1answer
85 views

Why won't the LED illuminate this way?

Attached a 9vdc motor to an LED to simulate a simple "generator" and I can get it to illuminate by swiftly spinning the motor in quick bursts, but if I connect a drill to the motor so there's a ...
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96 views

A question about reactive power

I have two questions about reactive power. 1) I have read that the flow of reactive power is proportional to the magnitude of voltage difference between nodes. Could someone explain me this? 2) At the ...
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1answer
70 views

Wind turbine design question

I am planning to design a wind turbine that is has rotor blade radius of 0.915m and is connected to a generator. The generators specifications are, it is an ac generator with 5000 coil turnings and a ...
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1answer
92 views

How to calculate power of a generator

I have been searching online on how to calculate power of a generator based on the rpm, but I cannot find anything. Is there a equation that relates rpm and power generated by a induction generator? ...
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1answer
178 views

Using hard disk motor as generator

I have disassembled 20 broken hard disks and taken out the motors, thinking they might be useful. However, they didn't work using DC current, because they required some kind of control circuit. Now I ...
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Does a DC toy motor emit AC when you spin it?

I just watched a video on Facebook by somebody who built a project to run an LED using a 9 volt DC motor scrounged from a battery operated toy. They simply wired the LED to the motor and then used a ...
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41 views

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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580 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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1answer
66 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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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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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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157 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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77 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
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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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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 others ...
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1answer
95 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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114 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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1answer
41 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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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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136 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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200 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
112 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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98 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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237 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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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). ...