Questions tagged [generator]

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Is there any way to relate the induced EMF from an alternator to the DC current that is used in the field winding?

I'm trying to simulate the open circuit saturation of an alternator. Basically, by changing the amount of current that is going through the field windings (rotor), the voltage induced in the armature ...
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2 answers
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How can I express parameters of a natural gas generator in terms of a diesel generator?

I am using the REOpt tool from the U.S. National Renewable Energy Lab to help in sizing a new battery energy storage system and solar PV array for an existing building. The building already has a ...
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How do 3 different gen kVA ratings Service Load (maximum), Service Load (continuous), and "Motor Starting kVA (Max.) relate to the nameplate value

I'm reading an engine generator parameter schedule that has three different kVA values listed. The standby generators have "Service Load (maximum)", "Service Load (continuous)", ...
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How does Kia charge the high-voltage battery in EV mode?

I recently bought a Kia Ceed 2020 PHEV (Plug-in Hybrid Electric Vehicle). Its specs mention a 6-gear Dual-Clutch Transmission (DCT), a 105 kW Internal Combustion Engine (ICE) and a 44 kW Motor-...
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2 answers
71 views

Is transmitting windmills' mechanical power to ground level that complex?

Thinking about the complications of building and maintaining turbine rooms installed at high altitudes in horizontal axis wind turbines (plus the difficulties related to it when, for example, a fire ...
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Can I use a coffee cup Stirling engine to generate power?

I want to generate electricity to power an led using a coffee cup Stirling engine. Will it provide enough power, or should I use something like a gearbox? Or will it do the job in the first place? ...
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1 answer
72 views

Are AC generators more efficient than DC generators?

I've been doing some research into AC and DC generators, and I was wondering if AC has any advantages in terms of efficiency. Given that AC generators are usually brushless while DC generators ...
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1 answer
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Do DC generators require more maintenance than AC generators?

Whilst researching, I found several sites that suggested DC generators required much more maintenance than AC generators. From what I can tell these sites seem to have assumed that the AC generator ...
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What does reactive power translate to in terms of torque?

Say I'm trying to connect an AC generator to a circuit containing an inductor and a resistor, powered by a steam turbine. I understand that because of the resistor, I'll be dissipating energy and ...
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2 votes
1 answer
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Investigating the potential of generating energy from moving water in pipes on a water production site

I work on a water production site, we have a staggering amount of water flowing, much of which is just using gravity pressure and feeding into reservoir tanks. (flow on various sites ranges from 100 ...
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-1 votes
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How to connect the rings to the coil

Hello I was recently watching this video and I have 1 question the video doesn't explains.It says that when the coil will start rotating the rings will start rotating as well. But how do I connect ...
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2 votes
1 answer
36 views

What are the characteristics of a motor that will generate current and is powered by a 30 cc, 2-stroke small engine?

Problem: I am trying to hobby-build a generator using a (old, working, throw-away gas, yard blower) 30 cc, 2-stroke engine. The 2-stroke engine will spin a motor and I want the motor to generate DC ...
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6 votes
3 answers
1k views

Three-phase versus single-phase operation of a generator

My generator (a Fermont MEP-803A, 4 cyl diesel, 10kW rated) can run in three distinct modes: Single-phase 120V, in which one terminal is hot, and another is neutral Single-phase 120V/240V, in which ...
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2 answers
362 views

How can thin wire in generator windings carry the high output current?

I observed the rebuilding of a 12KW, 120V gas-powered generator. I was amazed at how small the generator portion was (roughly the size of an electric motor you might find in a major home appliance). ...
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Windings for Linear Generator

I have built a small, simple linear generator. It works, but I'm sure it could be more efficient because I didn't know how many windings of magnet wire to use. I know there is a formula I could use ...
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Is it possible to simulate the electric power output of a linear alternator using finite element analysis software?If yes, which?

We need to build a small (1-2W) linear alternator for a project in engineering school. Is it possible to use finite element software to finetune our design instead of actually building real life ...
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3 votes
1 answer
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 ...
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38 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 ...
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2 answers
144 views

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

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 moves over the rotor. If so, I'd like some ...
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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 ...
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1 answer
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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 ...
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2 answers
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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 ...
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2 votes
1 answer
104 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 ...
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2 votes
1 answer
157 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. ...
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1 answer
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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 ...
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1 vote
2 answers
67 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 ...
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-2 votes
1 answer
58 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 ...
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2 votes
2 answers
160 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 ...
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2 answers
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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 ...
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1 vote
1 answer
130 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 ...
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2 votes
2 answers
1k 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 ...
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4 votes
1 answer
357 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 ...
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2 answers
2k 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 ...
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3 votes
2 answers
157 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 ...
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1 vote
1 answer
736 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 ...
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1 vote
1 answer
429 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'...
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4 votes
6 answers
17k 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 ...
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