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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Can this Eaton T0-2-8211/E changeover switch between multiple sources

I have this Eaton 1|0|2 style changeover switch T0-2-8211/E. Can I use this to switch between 2 different input sources? My intention is to use it to switch between shore and generator power on boat. ...
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5A 12V Battery charger -> 12V Marine Battery -> Inverter -> Fridge for longer run-time?

I currently have a 12V Deep Cycle Marine Battery hooked up to a 1,000W (2,000W peak) Inverter, this should run my fridge no problem, however the runtime wouldn't be terribly long. I also have a 700W ...
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Trying to make an electrostatic battery charger

Can the DC layout charge a battery? I see as if it is in a solar cell format. I know that for a solar cell, when light hits the cell an electron is discharged but the semi conductor only lets it go in ...
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How is it that the induced EMF in an alternator is in quadrature with the main flux?

Looking at the simplified diagram of an alternator, the flux "linked" with the conductor is maximum at 90, 270 degrees, is also when induced EMF is maximum. So isn't the main flux in phase ...
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Producing a small homemade generator with reduced cogging torque

Background: I'm working on my second hobby small generator design. Particularly difficult to source are (relatively) low speed permanent magnet motors that can be run in reverse as a generator with ...
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Turbine - governor droop for base load generator and frequency - regulating generator

Why is the turbine - governor droop for base load generator set at a higher value where as that for a frequency - regulating generator is set at a lower value?
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Generator frequency control

We are trying to run an AC generator on an RV for a customer. On an RV as you drive the engine RPM goes up and down. As I understand it, that would change the outlut AC frequency. Is there an ...
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How to make a synchronous generator unstable

I was try to analyse what factors can affect the stability of synchronous generator . Let's say a synchronous generator working in isolation and some loads are connected to it and we have to make it ...
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Is connecting a generator to the line input of an audio amplifier OK?

Disclaimer: I'm computer scientist I have a sinus wave generator (handyscope H3-5) from TiePie but the output power is insufficient for my application. The specification is here. I need at least 60W. ...
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How do I switch over between 2 AC power supplies with circuit breakers

I once saw a diagram where a house was supplied by a generator or from the grid by using 3 trip switches only. It must be manual so I can select as preferred, and not a automatic system. I also prefer ...
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Separately excited DC generator as a constant current source

Is it possible to operate separately excited DC generator as a constant current source using the following method? Keeping torque due to prime mover and field winding constant, reduce armature ...
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Offgrid backup AC power option

I’ve been building an off grid home for a few years - recently moved in full time. Living in VT, with limited solar, we depend on a Honda EM6500SX 240v generator to occasionally recharge 20 batteries ...
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Generator synchronization to grid and angle difference

Following conditions are needed for generation synchronization : 1 Phase Sequence 2 Voltage Magnitude 3 Frequency 4 Phase Angle I have question about Phase angle assuming that the frequency is the ...
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I designed a circuit to receive multiple AC voltages at the input and constant voltage at the output, but I wonder if the circuit makes any sense

I wonder if this circuit has any meaning and if it will work as I expect. I would like to know before I build it, due to lack of time. What I want from this circuit is to give motorcycle lamps the ...
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Voltage build up in induction generator and its working principle

I had some doubts while reading about working of self excited isolated induction generator . If principle of operation of self excited isolated induction generator is similar (in a sense that in ...
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How can I design a clean system using 120 v generator, battery back UPS, and a reversed transformer to get a clean stable 220v with 30 amps? [closed]

This is a old question about design and I must of asked the wrong question. so here goes. Do I even need the Battery backup in this design and how does it affect the volts and total amps? looking to ...
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What happens to the generator if we don't consume the generated electricity from generator? Only theoretical explanations, please

As all we know, there are different ways of generating electricity such as solar cells, wind turbines, dams, etc... I'm gonna pick wind turbines as a metaphor to tell what is on my mind. Let the wind ...
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How to predict which machine will act as motor or generator in Hopkinson's test?

Is there any way to predict which machine will act as a motor and which acts as a generator before applying the supply voltage? I cannot find a way to predict what will be the behaviour(motor or ...
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Inexplicable curve shape of short circuit current measurement on synchronous machine

I'm doing some experiments on a synchronous machine with follwing data: nominal power: 5kVA nominal stator voltage: 380V phase-phase nominal stator current: 7.6A nominal frequency: 50Hz / nominal ...
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31 views

Voltage value after generators in the power grid

What is the value of the voltage before the step-up transformers and right after the generators in the power grid? I mean the generators connected to the high voltage grid through step-up transformers....
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ICE-electric transmission drivetrain parameters

Pardon me if this question covers too many elements; also, originally I posted this in Engineering stack-exchange but it may be more relevant here. Basically I do not fully comprehend what would be ...
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Effect on current due to relative motion of load in homopolar generator

Description of figure - A homopolar generator in which disc is rotating with constant angular frequency with respect to ground frame and a uniform steady magnetic field is present perpendicular to ...
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Does the ratio of the mechanical degrees of a generator to 360 degrees have a specific term and symbol?

When it comes to DC generators, the ratio of the mechanical degrees of a generator between two brushes to the total mechanical degrees which is always 360 is used in different quantities such as ...
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121 views

nanosecond electronic pulser circuit - up to 100MHz

I would like to create a circuit which creates nanosecond pulses for a trigger signal with a frequency from 20 to 80 MHz, at 3.3V. I have created the following cricuit as can be seen in the attatched ...
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69 views

How will a motor respond as a generator?

Consider a permanent magnet motor which consumes maximum 12V @ 1.2A and turns at 1000 RPM. If I run this motor from a different motor at 1000 RPM then will it produce 12V @ 1.2A? What will happen if I ...
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Does armature flux move when the position of brushes in a loaded DC generator are adjusted? If so, what happens to the original resultant flux?

Based on my readings, a loaded DC generator creates both a main flux from the field poles and an armature flux that is perpendicular to the main flux. This causes a resultant flux at an angle. Because ...
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Can this be a generator? [duplicate]

I have two single-phase motors. This motors working in a fan. When I disconnect it from the mains and rotate it manually it produces 160V-190V. The problem is when this generator runs manually and ...
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Single-Phase Generator

I have two pieces of single-phase fans and they are literally the same, it is ac motor and whenever I rotate it manually it produce voltage about 160-190vac. I just get the idea that it can be an ac ...
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Asynchronous generator behaviour

I have this asynchronous generator Plot (please see below) where n = efficiency, P1 = mechanical power, P2 = power to the network, cos phi2 = power coefficient, and I2 = current. I guess as the ...
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Household inverter/battery array to supplement generator

I live in an area that's prone to occasional power outages (e.g., ice bringing down trees in the winter, hay landing on and blowing out transformers in the summer). Last summer we had a standby ...
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Generator faster than nominal speed with chopper

What happens, when a generator (PMSM) is driven faster than its nominal speed and a current chopper is used, to limit the output voltage? So assume we have a 12V generator at 3000rpm, where a ...
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44 views

Why slip is negative in this plot?

I have the following plot (please see first 2 plots below). The asynchronous motor is working as a generator. I wonder why the slip is going negative, is it because the torque also goes negative? Like ...
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How to measure the current generated in permanent magnet dc motor/generaator?

A motor of dia 1cm and 3 cm height and 200gms of weight. will it be able to generate 6 amperes of current? Can it handle that much amount of current? If not then how can I measure the current ...
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How can you predict the power an electrical generator (alternator) produces?

We have to design an electrical alternator in a multiphysics software, but we can't seem to figure out how to deduce the power it will produce. We need to charge a capacitor to 1000 joules (at 2000V) ...
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Bio Impedance Calculator circuit

I'm currently in a project which consists of making a bio Impedance meter with the AD5933. This could be a very easy project if I had to use the frequency range (1Hz->100kHz) that give the onboard ...
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What is the phenomena behind this DC generator plot?

There is a DC generator to be calibrated with its plot below. On the X-axis there is the ratio between the power of the generator/ nominal power of the generator. On the Y-axis there is the efficiency ...
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How To Calculate the β with limit to infinity?

I am a student. Our teacher gave us a problem that can be done by Kirchhoff's laws. The problem is that in the second case we have to calculate β → ∞, the teachers told us to calculate β using a limit,...
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Generator inertia

I am little bit confused with the idea of generator inertia for interconnected system. Below you can find my small questions. What is the meaning of 200 GVAs as a metric of inertia? If there is no ...
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54 views

Hand crank voltage spike

this is a follow up to my last question. I am working on a hand crank battery charger project. My current set up is that I am using a geared nema 17 stepper motor as a generator and have a bridge ...
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So the brushes in a commutator are fixed and assume a constant polarity, so how does the commutator reverse the direction of current?

I know this is probably one of the most common questions ever for someone who just started studying DC machines and I would probably get told by someone to just read somewhere and force myself to ...
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Generator voltage dipping at specific loads with observed increase in frequency

Background I have an interesting problem at hand on a diesel generator onboard a marine platform. The generator is rated at 380V, 50Hz, 3Ph and 1500kW output. Problem While conducting installation ...
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How can I efficiently convert the output voltage of a 3 phase generator of 700V to 12V, 24V or 48V DC?

I recently bought a wind turbine electric brushless generator rated for 3kW. I noticed that the output voltage is really high - it is around 700V at 5400 RPM. After some research on stackexchange, I ...
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Source of initial magnetic field in an alternator

I have been reading about how alternators work and I am wondering where the initial magnetic field comes from when no current is running through the field coils that excite the magnetic field in the ...
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Wind-powered fairy lights + battery charger: preliminary help

I'm new here and asking for help designing a yard-art project. I would like to use a small DC motor as a wind-powered generator to charge a battery (with overcharge prevention) and run some battery ...
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Generator AVR Wiring Question

I'm replacing the AVR of a Honda EX4500s. However, the new AVR came with a 4-prong coupler plus two other wires (red and white), as opposed to the original 3-prong coupler (just like the 4-prong, but ...
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How to choose bldc motors to use as generators?

First of all, sorry if I mess up certain words or terms, I am not very specialized in this department. I want to draw power out of an engine, producing around 50hp, or about 37kw of power. A normal ...
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DC motor as a generator as well as a motor in a car

Not sure if this was asked before, but can I use a DC motor to power the front axle, but then use the same DC motor as a generator when the vehicle is braking. Can I have a link which helps choosing ...
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Applying Thevenin's theorem between 3 points

I'm studying about transistor polarisation and got confused by this application of Thevenin's theorem, can someone please explain why eT is between B and M and why Vcc stayed even though it's not ...
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How do you connect alternators in series?

What does the circuit diagram of three phase generators connected in series look like? I know they are usually connected in parallel for obvious reasons.
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Damping to reduce error signals

So ive been doing some research on how overshoot can be reduced in an AC servo position system. I found out that tacho generators are used connected from the load to the motor that drives this load. ...

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