6 votes
Accepted

Extracting power from fusion?

This is an excellent question, and one that has not yet been fully answered by people working in this area of research. Let's look at some of the bigger projects and see what their proposals are: ...
eatscrayons's user avatar
6 votes
Accepted

Why are coils used to generate magnetic fields

The current generated by a conductor moving through a magnetic field is related to the length of the conductor and the magnetic field strength. A coil is simply a convenient way to get a longer ...
Chris Johns's user avatar
  • 15.2k
6 votes

Three-phase versus single-phase operation of a generator

But I'm thinking it may be better (more efficient maybe? less vibration maybe?) to run it in three-phase mode, with the load balanced among the three hot terminals. Correct. Figure 1. The load is ...
Transistor's user avatar
  • 10.7k
5 votes

Do generators produce a fixed load?

As you add bulbs in parallel, the load impedance drops and to light all the bulbs you have to pedal harder. When the load impedance becomes less than the output impedance of the generator, then more ...
niels nielsen's user avatar
4 votes
Accepted

Do generators run slower if the load is lower?

Generators don't use fuel at all. You are apparently asking about a generator coupled to some sort of chemical engine, like a "genset". Usually these engine/generator combinations have a regulator ...
Olin Lathrop's user avatar
  • 11.4k
4 votes

Do generators run slower if the load is lower?

At a lower load they run at the same speed but the generator becomes easier to turn which means the throttle to the engine driving it can be reduced to save fuel. The throttle is controlled by a ...
Andrew's user avatar
  • 766
4 votes

How to calculate hydropower in kW without water head

If you have horizontal water flow (no head) you are extracting its kinetic energy (from its velocity) not its potential energy (from its head). So you need to know the velocity of that flow as well ...
user_1818839's user avatar
  • 1,620
3 votes

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

the iron structure(s) inside a generator serve the purpose of minimizing flux leakage, which maximizes the utilization of the magnetic field in generating electricity. One of the ways in which they ...
niels nielsen's user avatar
3 votes

Planned power outage and backup generator

Electronics can be quite sensitive to the quality of the power supply, particularly in terms of providing a stable voltage and the right sort of AC waveform. There are two obvious solutions for ...
Chris Johns's user avatar
  • 15.2k
3 votes

Are AC generators more efficient than DC generators?

You can have brushless DC as well, but its all a balancing game of cost over its lifetime. Efficiency only matters when the entirety of the process is considered. One high efficiency process can be ...
Abel's user avatar
  • 1,353
3 votes
Accepted

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

TL;DR:IMHO, the driver for keeping the electrical generation closer to the hub is for primarily for eliminating -as much as possible- moving parts for safety concerns. The secondary benefit is the ...
NMech's user avatar
  • 24.3k
2 votes

Planned power outage and backup generator

The most practical and simplest is to review the breaker box. Below is an example breaker box for a typical US single family house. Note: US base houses are power using 120 VAC. Add up total current ...
Mahendra Gunawardena's user avatar
2 votes
Accepted

How to accurately calculate the rpm from a gear train

Obtain a cheap plastic hand crank generator or several and play. That will show you much of what you need to know. If you turn the handle 1/8th turn (45 degrees) in 1/4 second then its RPM is 60/...
Russell McMahon's user avatar
2 votes

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. No. A motor develops back EMF due to conductors cutting across magnetic field lines. This has nothing to do with current. ...
Olin Lathrop's user avatar
  • 11.4k
2 votes

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

Kind of, there is a torque produced proportional to the applied load that counters the rotation, as clearly must be the case to cause mechanical power to flow from the prime mover to the machine rotor,...
Dan Mills's user avatar
  • 251
2 votes

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

what you are describing here is basically a reversed heat pump that uses a temperature difference to run a heat engine in which the working fluid is so chosen as to undergo a phase change during the ...
niels nielsen's user avatar
2 votes
Accepted

Three-phase versus single-phase operation of a generator

While the other answers here are compelling, they're only half the truth. If you consult your manual you'll find that the generator load windings are reconfigured when using the mode selection switch ...
J...'s user avatar
  • 197
2 votes

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

Here is the cheap way to proceed. First, find you a battery-powered weedeater that is second-hand, or a discard. disassemble and test the motor for operation. If it operates, now you have a ...
niels nielsen's user avatar
2 votes

Can an electric motor act as a load for the electric generator rotated by that motor?

I think the procedure you want is: Start the motor. The only load will be the losses in the motor and the unloaded resistance of the generator. Adjust the generator excitation so that the voltage ...
Transistor's user avatar
  • 10.7k
2 votes
Accepted

What device/system would be used to increase rpm and decrease torque of some shaft?

A pair of gears. The ratio of diameters will control the speed relationship as well as the torque. Or a pair of pulleys but then they may be some slip between driven and driver, however the ratio of ...
Solar Mike's user avatar
  • 15.8k
2 votes

Can flow batteries be optimized to be fed low voltage and high current?

In any battery (flow or not) (pedantically: any electrochemical cell), current can always be increased by making the battery bigger, but voltage is set based on which chemical reaction you are using. ...
user253751's user avatar
2 votes
Accepted

Why does a car generator employs an alternator (i.e. AC) when power supply is provided by a battery (i.e. DC)?

The brush arrangement in a DC generator wears out with use and when it stops working, the driver is stranded with a car that can't start and won't run. There are no brushes in an alternator to wear ...
niels nielsen's user avatar
2 votes

Impact of generator start-up on its health

Startup wear in internal combustion engines happens mostly because the engine is turning before the oil pump has had a chance to develop full pressure and move oil to all the moving parts of the ...
niels nielsen's user avatar
1 vote
Accepted

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

My question was based on an appearance that the thin winding wire seemed to violate the laws of physics, so there might be some other factors at play. Neil_UK answers this in generator coils: max ...
fixer1234's user avatar
  • 146
1 vote

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

Note: Small Gauge mean the wire can carry a significant amount of current. Example per the attach AWG 4-5 can carry 100A. There are lot other factors need to be considered before selecting a wire. ...
Mahendra Gunawardena's user avatar
1 vote

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

It’s a pointless design since all you do is decrease the amount of magnetic coupling between the rotor and stator. You may as well just reduce the current - it’ll have the same effect. You’d have to ...
Kuba hasn't forgotten Monica's user avatar
1 vote

Why vertical wind turbine don't be half covered

I think you may be confusing vertical axis wind turbine based on lift mechanism as in an airplane wing, with the low efficiency models that are used to show the wind speed on rooftops as part of ...
kamran's user avatar
  • 22.4k
1 vote

Theoretical maximum generated power for a given torque

your circuit requires (3 volts x 10 microamps) = 30 microwatts to operate. in a 24 hour day it will consume (30 uW x 24hr) = 720 uW-hours of energy. your pump produces (1 oz-in x 100RPM) units of ...
niels nielsen's user avatar
1 vote

Theoretical maximum generated power for a given torque

You're supplying a power of only 30 microwatt, so in a day 2.6 joules will be generated. That's very little. 1 oz-in is about 0.0071 newton meter, 100rpm is about 10.5 rad/s. 0.0071Nm at 10.5rad/s ...
Bart's user avatar
  • 1,184

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