Questions tagged [generator]

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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402 views

How can I safely charge a 12V deep cycle battery with a wind generator?

So I'm trying to figure out how to safely power a small 12V deep cycle battery with a home built wind generator. It's a 36VDC motor that outputs around 5V with low wind, and 12V with lots of wind (1A -...
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2answers
97 views

How does conversion to electricity work? [closed]

I'm having a bit of a hard time understanding how electricity is created in the practical sense. For example, when heat is explained , you have the scientific definition of what heat is , and then you ...
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1answer
127 views

Electromotor + transformer poor output

I kindly ask you for help in my project. Outline: Electromotor used as generator, connected to transformer does not provide expected output; output is lower than input. When connecting the joule ...
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2answers
91 views

Power system - Economic dispatch

Quick concept related question, I have a system with 5 generation units and I have to find the maximum demand that the system can support and still be N-1 secure. their max outputs are: Unit A= 155, ...
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2answers
128 views

A situation regarding AVR and bad power grid voltage [closed]

I have a question regarding the following situation: Some poultry farm has taken some serious losses when their diesel generator died, only being able to provide backup for 45 minutes and killing ...
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0answers
80 views

Can't get a small 3 phase generator to produce 1/10 of its rated output. I need a little help.

My concern I am writing about is with a small generator not producing current or being able to be loaded. First I'll describe the product. I bought a couple mini brushless 3-phase generators (motors). ...
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2answers
2k views

Selection of D.C. Motor for hand-cranked generator

I'm a college student working on an independent engineering project. We are using a D.C. Motor as a generator. It's going to be hooked up to a circuit with capacitors and an LED assembly to store and ...
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4answers
96 views

which generates more efficiently, single or 3 phase systems

I want to build a hand crank generator for my travels and I am curious if there is an advantage to a three phase "motor used as generator" design or if it will be around the same output to a similarly ...
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4answers
5k views

load sharing in parallel generators

My question is the following: We have two 220V 20A generators connected in parallel to total power 8.8 kw 220 v 40 A load is 5.5 ohms I'm interested how each generator sees this load since every ...
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1answer
227 views

DC Shunt Generation Ascending/Descending Terminal voltage Saturation Curve help?

In a DC Shunt Generator we increased Field Current from 0 to 2.0 and calculated the Terminal Voltage, we then decreased field current from 2.0 to 0 and collected our field current again. When plotting ...
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1answer
705 views

Torque control of a BLDC motor acting as a generator

I'm trying to build a dyno for electric motors. The dyno consists of two motors: a motor under test (MUT) and a load motor. The two motors are connected together through a shaft. On the shaft there's ...
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3answers
1k views

How do power generators generate AC at a constant frequency?

As far as I know, alternating current is generated at power plants by converting rotational energy to electricity. The frequency of the AC depends on the rotational frequency of the rotor. In USA, the ...
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61 views

Regulating Volatge Output of Synchronous Motor

I'm attempting to regulate the output voltage of a synchronous motor being used as a generator. I've hooked up a LM317 along with a high voltage capacitor and some diodes. I decided to attach the ...
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4answers
492 views

small wind turbine pancake generator, force of magnets effect on rotation when charging a battery?

Contexte: a DIY small wind turbine pancake generator, made with 2 rotor plates of 12 rectangular magnets, and one stator of 9 coil wired. After the generator, the 3 alternative electricity phases are ...
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4answers
12k views

Does a generator produce voltage or current?

I know that this question might sound very stupid for +90% of you, but my brain doesn't really get the electricity generation. The thing that I don't understand is what does a generator produce, ...
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1answer
353 views

coil winding wire organization

In winding a coil for a generator, does the organization of the wires have an effect? Should I be very careful to lay each turn of each layer side by side in a neatly packed line, or can I be quick ...
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1answer
2k views

generator coils: max power given wire gauge

I've been messing around with some neodymium magnets and magnet wire to make a generator. I've rotated my rotor as fast as I could and noted the no-load voltage. I wondered if (at this current speed) ...
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1answer
177 views

How to get from 3 phase variable high voltage AC to 230V AC

I already asked all the electricians in my area (at least 7-8) and nobody could help me, so I am asking you. I have a Pelton generator - a type of water powered generator. My output is 3 phase ...
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1answer
61 views

Measuring generated power (kW) in a power plant and storing/logging values

Given an electric power plant (hydro energy) that currently has just an analog indicator for how much power (kilowatts) is generated, which components would be needed to measure the generated power ...
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1answer
146 views

I have a generator that can produce 150 watts, i have a dc motor that takes in 100watts, why is it that my generator wont run the motor? [closed]

I am trying to simplify this as much as possible as there are tons of variables that people could point out, but i made a small generator which then I rectify to produce DC straight out of the coils, ...
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1answer
91 views

Amp draw at different voltage

I would like to power a 12 volt automobile radiator fan with a 110 volt generator. I need to know what the amp draw will be on the 110 generator. At 12 volts the fan is rated at 24 amps. If I use a ...
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3answers
75 views

how to avoid a coil turning into a magnet when energy is dragged out of it ? is there any solution at all? [closed]

when a generator is generating electricity and at certain point we try to get the energy out of the coil, thus resulting in the reduction of RPM due to the coil acting as magnet. is there any way to ...
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2answers
111 views

Question regarding driving an audio system with a generator (without inverter)

We're arranging a music event where we're going to drive a few speakers and a dj controller. We've been trying to find a generator that would work and so far we only have access to three. All three ...
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2k views

How EMF is generated in a generator

Classical education of EMF generation usually starts with something like this: Where a wire is placed within a magnetic field and moved to create EMF. Or this: Where a magnet is moved within a coil. ...
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338 views

What might cause a fluctuating resistance of a generator winding?

Before assembly of a machine that contains a three phase generator I check the resistance between the 3 phases of the generator with an ohmmeter. The generator is kept stationary and the temperature ...
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1answer
211 views

Regulate, convert to DC and store current from home made AC generator to charge laptop

I am working on a small experimental project, learning more and more about electricity and electronics. So, I have found this broken mixer and, surprisingly, it has a 300W engine with magnets that ...
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4answers
244 views

Zener over voltage protection from DC hand crank generator

I have a board powered by a hand crank generator. Under normal conditions the voltage peaks at 18-20 volts. However spinning the handle violently will peak higher at 30+ volts. The generator runs ...
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2answers
88 views

Choosing equipment for 3 phase wind generator?

I want to be able to move the windmill I am designing out of the wind when the power output is to much (high wind scenario). To do this I need to measure the output of the power. To set everything up ...
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485 views

Calculating the real and reactive power of a transmission line

I have a single machine connected to an infinite bus with the following parameters: Sending end power = 3.75MW RL=5.18 ohms XL=130 ohms VS (Generator bus)=161kV VR (Infinite bus)=161kV Sending end ...
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123 views

Programmable GHz signals

I would like to generate custom waves in the gigahertz range. With beginner FPGAs like the DE0-Nano or microcontrollers like the Arduino, I can only generate waves up to the kilohertz range. What ...
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1answer
80 views

Per unit solution gives different result

We have a 200MVA , 15kV , Xs=1.62pu synchronous generator feeding a load of 15kV and 100MVA with an inductive power factor of 0.8. I'm asked to find the generator's voltage (along with its phase angle)...
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96 views

How can a DFIG have total control of reactive and active power?

I'm confused with the power flow of the rotor to the grid, specifically the both-way direction
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144 views

Is there a generator that injects current into high impedance voltage source?

For example, having battery with high (few megaohms) series resistance, is it possible to convert mechanical energy to current at that battery's voltage? Or in other words, if I have low voltage, ...
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1answer
5k views

How does the speed of a synchronous generator changes with load?

When the generator is rotating at rated speed and let us say that the load decreases then the mechanical torque will be more than​ the electrical torque which will lead to increase in the speed of ...
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3answers
2k views

Fruit juicer motor generates very low voltage

I'm planning on connecting an elliptical trainer to an AC motor in order to charge some batteries and use the energy later. So I found an old 300 W juicer which I disassembled. Then I connected the ...
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2answers
2k views

Can I charge a 12V battery with a variable, low-voltage generator?

Let's imagine I have a generator that outputs a voltage between 0V and 2V, most of the time around 0.45V or 0.85V. Is it possible to charge a 12V battery with it ? How can I estimate how long it will ...
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70 views

AC Current confusion

when an AC generator generates current it alternates, so does both terminals of ac generators has current means both are live wires ?
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Is it a disadvantage for a generator to supply both resistive and reactive current to its load?

Suppose The power network 1 has a resistive load and therefore the current supplied by the generator 1 to the load is purely resistive. The power network 2 has a resistive + inductive load and ...
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2answers
69 views

Logging 3-phase power

I need to measure and log power, and I want to do it mostly correctly. I would greatly appreciate a listing of the errors I have made in my method. I want to measure (and log) the power output of a ...
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1answer
617 views

Driving load with sine wave from signal generator

I would like to use a signal generator to generate a sine wave. This sine wave will then need to drive an inductor as part of a transformer. What is the most efficient way to give this signal greater ...
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4answers
829 views

Charging Batteries from DC Bike Generator

I have salvaged a motor from a treadmill to make a stationary bike generator. Motor Specs: 180 VDC -4500 Rpm 1.3 Hp 6 amp I mocked up a bike trainer and using the rollers from treadmill and was able ...
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0answers
442 views

Lenz's law to determine the direction of induced current

I came across this MCQ in my text book, it says: To determine the direction of current induced in AC generators, we use.... (i) Lenz's law (ii) Fleming's right hand rule (iii) both of them ...
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2answers
87 views

Total copper loss in parallel operation of dc generator

While calculating total copper loss of two dc generators connected in parallel which is valid approach? calculate resultant resistor of two parallel connected generators then use ohmic loss formula ...
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2answers
706 views

Do I still need to ground this Generator?

We have a 3-Phase AC Electricity Generator (19KW) which comes with tires for ease of transportation, even though it requires a crane for lifting. We have it installed in such a way that its main ...
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2answers
543 views

Measuring the power output of a hand-crank generator

I am working on a project which aims to compare the energy generated from a hand-crank, DC generator, to that of solar panels. The hand crank generator will not actually be powering anything, but we ...
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1answer
101 views

How much voltage will i generate from this DC motor? [duplicate]

http://www.moog.com/literature/MCG/moc23series.pdf i am using the C23-L33 model. if i rotated the motor at the rated speed of 3000RPM, how much voltage will i generate? can I please know the exact ...
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1answer
404 views

how to know the voltage i can generate from a 240V AC motor

I have an AC motor from a toilet fan, and i want to use it as an air turbine to generate electricity. all i know about the fan/motor is the following: Input Voltage:220-240V AC Input Wattage: 15W ...
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2answers
571 views

What is the maximum possible current that can mains supply can deliver? [closed]

This question has been bugging me for a while. I know that theoretically its like - infinity to + infinity and it depends on the load that is connected to the mains supply plus the load at which the ...
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3answers
173 views

What makes the generator practical?

"A student tried to make an AC generator consists of a coil of one turn, and cross sectional area of (7.54 × 10^-3 m²), and rotates in magnetic flux density (2.5 × 10^-2 T), and when it was taken out ...
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1answer
100 views

Which drawing represents an AC generator?

This was a problem in my text book, and it says: "A magnet bar has been installed in the vertical rotation axis of a coil. Which of the above drawings represents an AC generator?" Ok, the answer to ...