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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Using an ATS interface to remotely start a generator

I am trying to use the ATS (automatic transfer switch) interface of a generator to set up a remote start system using a microcontroller with a cell phone modem and relay bank (for a rural microgrid ...
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42 views

Generator requirement tool accuracy [closed]

I am building the below web application to publish for free in order to help people individuals calculate what size generator they might need in order for their specific needs. My question is whether ...
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47 views

Adjust output offset of a Signal

i am trying to develop a signal generator which can have sin and rectangular signals . Another requirement is to adjust offset to +-1V.Here comes the question . I have finished to adjust + offset by ...
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1answer
30 views

Arbitrary Function Generator or DAC with memory IC help

I am trying to look for a hardware solution to my current problem. Currently I am using an AFG preprogrammed with a signal (example below, 8bit resolution is OK, using 30 or more data points each 1us ...
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3answers
82 views

This is a question about squirrel-cage induction machine theory

When operating as a motor, the stator rotating field induces voltages (and hence currents) in the rotor windings and makes it spin (hence the rotor produces a torque). When operating as a generator I ...
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50 views

Low speed electric motor (from a blender)

I'm trying to build a Van der Graaf generator with my little brother for a school project. The thing is we get a electric motor from and old blender and want to use that for power our generator, but ...
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1answer
29 views

Where can I find an electric generator that produces electricity when spun? [closed]

I am fairly new to electrical engineering (I am much more skilled on software rather than hardware), and I am starting to pick up on building circuits and such. I am attempting to design several of ...
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59 views

Stepper motor as generator

The answer to "DC Motor as a Generator Voltage and Current" from Olin Lathrop included: "Sometimes these parameters can be inferred from other specs. For example, consider a motor that puts out ...
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2answers
81 views

What happens to a generator when we rotate it in open circuit(no load)?

What happens to a generator when we rotate it in open circuit(no load)? Let's say we have an old bicycle's dynamo without regulators, capacitors and battery. What happens if we remove the lamp and ...
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73 views

How to make a simple manual gengerator that can produce a 9 volts of electricity?

I have a project from my subject which that project was to create a manual generator that can produce up to 9 volts of electricity. I've been searching some samples that is homemade manual generators, ...
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1answer
56 views

High voltage step up power module

I have bought the stuff in the image below from eBay in order to generate an electrostatic field. But the spec of the item is, well ..., written in chineese with some english flavor. I have tried ...
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2answers
100 views

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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1answer
51 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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2answers
98 views

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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1answer
43 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
32 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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55 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
36 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
42 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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3answers
85 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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4answers
159 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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0answers
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
26 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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45 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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76 views

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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2answers
76 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
106 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
2k 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
42 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
73 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
91 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
45 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
570 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
162 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
87 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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101 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
72 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
98 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
200 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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2answers
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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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1answer
46 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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5answers
613 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
80 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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0answers
36 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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1answer
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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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1answer
190 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
80 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
89 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 ...