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Questions tagged [generator]

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3
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1answer
1k views

Do generators produce a fixed load?

As an example of my question, imagine I have a small generator attached to a bicycle pedals. If this generator is connected to one light bulb, how would it compare with the generator being connected ...
0
votes
0answers
31 views

Issues with Building AC Generator

So we are trying to build an AC generator, an alternator, if you will. We are using a 5" PVC pipe for the body with a hole drilled diametrically, through which a bolt passes. Inside of this pipe, on ...
0
votes
1answer
46 views

Is there a motor design where a rotor gradually moves into a stater?

I was wondering if there is a motor/generator design where the rotor moves gradually in and out of the stator along the axis of rotation, or the stator over the rotor. If so, I'd like some resource(s)...
0
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2answers
63 views

Why vertical wind turbine don't be half covered

I think it would be more efficient for a vertical wind turbine to have a covered funnel about half of it Something like this figure It would protected the turbine from opposite wind and also ...
0
votes
1answer
39 views

Difference between permanent magnet and electromagnet exciter generator in principles wise?

I searched about this, but couldn't find any helpful explanations. All it says is that magnetic field is generated by either permanent magnets or electromagnets. In both cases, how does the exciter ...
0
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2answers
40 views

Theoretical maximum generated power for a given torque

Being an electrical engineer, I'm hoping someone will help me double-check my math. I have a small circuit that I want to power for years that consumes an average 10uA at 3V. I'd like to power this ...
2
votes
1answer
98 views

How do generators in space transmit/ deposit energy back to Earth? [closed]

I've read about the idea of putting solar panels in space, or the already used electrodynamic tethers which gain energy as they move through Earth's magnetic field. The question I have is: How do ...
2
votes
1answer
44 views

Generating practical power without an iron core, but with high RPM

Here's what I'm proposing - a small turbine directly coupled to a permanent magnet that's spinning at, say, 150k RPM. The magnet is enclosed one or several wire loops parallel to the axis of rotation. ...
0
votes
1answer
24 views

What is the fraction of power transmitted to the generator in full-hybrid cars?

In full-hybrid cars like the Toyota Prius, usually both internal combustion engine (ICE) and electric motor produces mechanical power to the wheels at cruise. But some of the mechanical power produced ...
1
vote
2answers
62 views

Is there a generator that uses night and day this way?

Is there a liquid or compounds that can change from gas then to liquid and back in a vacuum or with air? In the picture below the hour glass looking devise liquid comes in contact with light or heat ...
-2
votes
1answer
51 views

Which Generator is “Better”: DC or AC? [closed]

So, I have a project where I have a bicycle that powers a type of generator. I have everything else done, but I need to pick a generator. My first problem is that I don't really know which type of ...
1
vote
1answer
77 views

Extracting power from fusion?

If we are able to create a fusion reactor so there is a net gain in energy how can we turn the heat into electricity. I know how it is done normally for fission, steam, but how could this be adapted ...
1
vote
2answers
1k views

Are there reversed rotation direction in generators (as back EMF in MOTORS)?

There is a back EMF in a motor, due to current flow in a magnetic field. So, in a generator, is there a reverse rotation (opposed to original rotation) due to a current flow in magnetic field? I ...
1
vote
1answer
97 views

Decreasing the circumference of a generator shaft [closed]

I know that torque is proportional to RPM and vice versa, but id like to know why we cant just decrease the circumference of a generator shaft in order to compensate for increases in torque. In other ...
3
votes
1answer
542 views

Why are coils used to generate magnetic fields

I understand that coils have properties over a single wire in producing a magnetic field. But I'm a hobbyist not an expert. I know electricity was discovered from a wire carrying a charge when ...
5
votes
1answer
256 views

What area should I use when calculating induced voltage?

I am trying to build a low power output generator with 12 pole pairs and 9 stator coils. The design will be similar to the one described in this link Basic Principles Of The Homebrew Axial Flux ...
1
vote
2answers
1k views

How to calculate hydropower in kW without water head

I am trying to do some calculations to figure out how much power output would be produced from a water powered generator that uses horizontal current flow to move the generators coils rather than ...
3
votes
2answers
130 views

Planned power outage and backup generator

In a few days, there will be a power outage that will probably last for 8 hours. We had this issue before, but then only our part of de building was affected. It was temporarily resolved by using 2 ...
1
vote
1answer
484 views

How to accurately calculate the rpm from a gear train

I'm trying to build a self-regenerating door lock as a side project in college and i'm having some difficulty accurately calculating the gear trains output (in rpm), the purpose of this gearing system ...
1
vote
1answer
216 views

How do I build a dc generator at home for my presentaion?

I'm having a presentation about dc generators and I wanted to demonstrate how it works. Anyone have an idea on how to build one. I left my electric motors at home because of Christmas break, now I can'...
4
votes
5answers
3k views

Do generators run slower if the load is lower?

When I see electrical generators specified, they usually give the fuel consumption as at "rated load". So,for example, a 5 kilowatt generator might consume 0.6 gallons per hour. However, what happens ...