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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3-phase generator has no output on some terminals - should we worry about it?
This is a Lister alternator no 34257/74 380/220 V 50 Hz 21.9 kVA 3-phase 1500 RPM.
We are measuring 380V between terminal pairs 1-2, 2-3, 1-3.
We are measuring 220V between terminal pairs 1-4, 2-4, 3-...
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Why IC 7805 is not working with Piezoelectric element as a 5V Voltage regulator? [closed]
I tried to make a Piezoelectric Generator consisting of Piezoelectric buzzer disc. I rectified the output voltage to DC voltage and tried to regulate it to 5 volt using IC7805 with capacitors, but it ...
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Is voltage to frequency ratio of a permanent magnet alternator constant in different speeds?
We have a permanent magnet alternator. I want to know if we change the speed of rotation, are the output voltage and frequency increased by same proportion? Is V/f ratio constant in different RPMs?
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Calculating generator over-speed following sudden disconnection and delayed valve closure
I'm working on an exam question related to power systems and need help calculating the over-speed of a generator following a sudden disconnection from the grid. The question is:
A 475 MVA, 2 pole, ...
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Where does the electricity in electromagnets come from if permanent magnets from generators decrease their magnetic strength?
The question has been puzzling me for some time, I presume electrical power starts from generators, the heat produced by them(generators) cause their magnets to weaken and electromagnets have to be ...
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Why does the valve symbol have a Clase symbol,or short-circyit symbol before the earth [duplicate]
Could anyone explain to me why the valve symbol have a shortcircuit symbol or termination symbol before the earth???
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How does a hydroturbine induction generator control its own frequency/water flow if it is already excited/pre-determined by the grid?
I was reading this article How do you connect hydro to the grid? and the author states there are two methods. One by a fixed-speed induction generator and another by a grid-tied inverter. I understand ...
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Using a 6 V DC motor for a 3.3 V LED
We are tasked to do a generator with LED for our project. We were given this video as a guide.
I am planning to buy a 6 V DC motor to power a 3.3 V LED. Is that okay? Although I have read somewhere ...
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Permanent magnet alternator: what happens when windings get shorted together for voltage regulation?
Here is a typical scheme for a permanent magnet 3 phase alternator as found on many motorcycles and recreational vehicles, with rectification to DC via a diode bridge and subsequent voltage regulation ...
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4am Shut down of hydro system that uses motor as a generator
My micro hydro system "motor as generator" stops generating on random days, but always at 4 am. It seems the resonance between the capacitors and generator winding is lost and the generator ...
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Three-phase motor as generator: intermittent loss of field
I have a 7.5 hp, 3-phase motor I am using as a generator on a grid-tied micro hydro system.
The system works well most of the time and generates roughly 4400 W or about 100 kWh a day.
The connection ...
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Does speeding up a diesel generator result in a better load response?
If I speed up my prime mover (500 kW CAT diesel generator) from 60 to 61 and 62 Hz 1800/1830/1860 rpm and hit it with 25/50/75/100 percent load steps, how much, if any kW/HP is gained?
I am simply ...
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How to extend up-time after power supply is gone
I just started to work on a small home project. I have an indoor bike that I use quite a lot. The resistance of the bike can be adjusted manually in a purely mechanical way (by tightening a screw). ...
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XR2206 Signal Generator breaks up and distorts badly all waveforms
I just put together this signal generator with a xr2206 DIY kit, single supply, tried 9,6V smps first (too low!), then w/ checked speced minimum 12V DC Li-Ion Vcc, same behaviour, distortion/unstable. ...
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Ratio of electrical input to mechanical input in a synchronous generator
In a synchronous generator we want to convert mechanical to electrical power but the thing that confuses me is that we also use electrical input as dc current which goes through rotor windings to
make ...
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Regulator Circuit 30-300v for 3-phase generator
I need help with the rest of the circuit to control the field in the generator (it is a 400v 3-phase 50Hz generator). I have looked around online and only find car generators 12v and 24v.
What I'm ...
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What happens when you get a fault to earth without an MEN link on a 3 phase generator? [closed]
For context, an isolated type single phase generator (no earth stake or neutral-earth link) had a residual current device connected to it and then a fault between active and earth was placed on the ...
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Charging LiPo Battery with Solar Panel and Water Turbine Generator
I'm looking for a way to be able to connect a Solar Panel (5.5 V / 540 mA) and a Water turbine generator (3.3 V / 120 mA) together to charge a LiPo Battery of 4,000 mAh.
While using the solar panel ...
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How can I feed the output of a universal motor (as generator) back into its field coils?
I've been playing around with a universal motor to see if I can get it to generate power - with the aim in mind of trying to connect it to a wind turbine in the future.
I have had some success at ...
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What motor will work best as a generator for low torque input?
I would like to know what kind of motor will work best as a generator.
The input will be RPM with low torque around 20-40 N*mm (this is the minimum.) It should be possible to rotate the motor at this ...
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Wind Turbine Generator [closed]
Can an unstable and low current supply from a 7V wind turbine dc generator motor charge a 24V lithium-ion battery? If yes, how will it be done?
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Is it required to have both ATS/ACTS and AMF in electrical system?
I just read an electrical system layout and specification, where the designer put an ACTS on the distribution panel (to switch between the main and generator), and AMF on the generator. What I read ...
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Is the per-unit internal voltage equal to the ratio of field current to no-load field current?
An example problem provides the following information to solve for the field current.
The problem is below.
A large 60 Hz synchronous generator can be considered to be round rotor, that is, xd = xq = ...
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Generator control over active and reactive power
My background is in electrical installations. I have been put on a project that is assessing generators. I would like to tap into the experience of those on this forum.
I am asking these questions ...
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Water turbine generator
I have a 5.5 hp 3-phase induction motor, 440 V, 60 Hz, 1760 rpm attached to water turbine wheel that I would like to utilize as line source for home power generation.
May I know the additional circuit ...
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Can a generator with rated ouput 2.5kW handle 2 PCs rated 600W and 500W connected to two UPS rated 3000VA/1500W and 2000VA/1200W [closed]
I'm having issues with different answers from ChatGPT and Bard. I'm not an expert so I would appreciate an expert opinion.
I have a PC rated 600W connected to a UPS rated 2000VA/1200W with a power ...
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Measuring electric generator AC frequency
I need to measure the AC frequency of a 230 V electric generator (gasoline powered).
I have a cheap but ok multimeter that does Hz but the reading is erratic (some 1 kHz...)
The reading on the mains ...
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Why is the shunt field of a DC starter-generator disconnected when used as a starter?
The Lycoming T53 turboshaft engine is started using a starter generator. The starter generator is a shunt generator. When the T53 is started, the starter generator is used as a DC motor to get the ...
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Brushless DC Motor -> Generator Power
I would like to know the approximate Voltage I could produce if I used this motor as a generator... If anyone could help me out with this I would greatly appreciate it!
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Is it ok to short two phases of a wind turbine together through a transformer?
I have a wind turbine that I intend to measure the speed of by measuring the frequency between two of the phases and then relate the value to the speed of the generator.
The frequency meter couldn't ...
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Bicycle Generator Help
I've been finding myself bicycling inside more and more as I'm getting into the whole Zone 2 workouts where I need to be at a steady state as much as possible and that's hard to do biking outdoors. I ...
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TN-S Earthing parallel return paths when multiple MEN links
I have a bit-of a unique situation. I have a generator which is running a TN-S earthing system. It is powering demountable offices.
I assume that all sub circuits would have RCDs in the demountable, ...
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Generators given in kVA but loads given in kW
If I have a generator at 13kVA 0.8 PF. It is capable of producing ~10.4kW.
I have a load of 10 kW but at a 0.7 PF and therefore consuming ~14.3 kVA.
What is the relationship here?
I thought this was ...
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Stator wiring in Robin RGD351 not matching manual
I am currently trying to figure out why a Robin RGD351 single phase, self exciting has stopped producing power. I have gotten the manual (https://www.manualslib.com/manual/988411/Robin-Rgd351.html) ...
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How to calculate the power of a DC shunt generator?
How much power a DC shunt generator can generate if it was coupled with this induction motor:
Induction motor:
3-phase / 400v / 50Hz / 600w / 1250RPM
DC generator:
Excitation voltage: 0-220VDC
...
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VFD runs has backup generator, breaks down twice
I am Electroman, but very ignorant in electrical knowledge. I have a problem.
We have an irrigation pump connected to a VFD that runs on the electrical grid but is connected to an emergency backup ...
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What circuit allows me to drive positive kV level pulses to antennas and over spark gaps to earth ground?
Ideally I would like 0-6kV pulses with adjustable frequency, but I could settle for 4kV and 40kHz.
Pulses should be sharp as possible. Someone suggested a PWM module with a mosfet inside and to drive ...
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How to calculate the values and ratings of wound Induction Motor Rotor Resistance Starter resistors?
How to calculate the values and ratings for the Rotor Resistance Starter resistors?
Motor specs:
3 Phase 400V
1/2Hp
4 Pole
1750rpm
Y connection
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Troubleshooting a homemade Van de Graaff generator
So, I'm trying to build a Van de Graaff generator from household items, but after a lot of tries, I'm still unable to get it working and was hoping someone here could help.
The problem is that no ...
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4W Electrical DC power from propane
I'm looking for a way to generate around 4W of electrical power (12VDC, 350mA, to be specific) with an efficiency of around 10% in a small and safe package.
The background of the question is that I ...
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Multiple EMF sources in a parallel circuit, semantics
Simple question, really. Need some clarity on parallel vs. series-opposing circuits.
V1 is an automotive gen/alt, assume 80A max output. BAT1 is a lead-acid battery. V1 is charging the battery and ...
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How to generate this signal in LTspice
I would like to generate this signal on LTspice. Does anyone know?
(this pic is plotted from excel and matlab)
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How to connect a digital meter between alternator and batteries?
We are using a 24 V, 100 A external alternator in our vehicle to charge leisure batteries. We need to monitor the alternator’s voltages and current on a digital meter but the alternator is grounded ...
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Charging lead acid battery with DC motor
I want to charge a 12v lead acid battery with a dc motor used on the Power Core E100 rated at 24v 100w. I’m spinning the motor with a bike so the output voltage fluctuates which I assume isn’t good ...
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Power transmitted from Arbitrary Waveform Generator
I have an arbitrary waveform generator. The arbitrary waveform has 2x CW tones of same amplitude. I'm only able to configure the overall power of this waveform, and the generator's manual says this ...
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Why must we turn the admittance into Y matrix, then turn the Y matrix into Z matrix before we calculate the fault current?
The one-line diagram is as below,and a three-phase fault has occurred in the bus 1,now find the fault current
\begin{align}
Y=\begin{bmatrix}Y_{11}&Y_{12}\\Y_{21}&Y_{22}\end{bmatrix}=\begin{...
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How to connect two wildly different power sources?
I want to be able to have a kinetic generator and a mains plug both plugged into a battery, so that I can choose to pedal or rely on the mains to charge when I wish without needing to remember to ...
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Crank an electric generator gasoline engine by using its alternator
Currently I have a gasoline generator (2 kW 230 Vac single phase), which has an electric starter. I'm searching for a potential replacement, but the brands I like doesn't have one around that power ...
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What happens to the energy returned by capacitive loads in AC? [closed]
Power alternates equally between cycles of positive and negative. (Figure above) This means that power is being alternately absorbed from and returned to the source. If the source were a mechanical ...
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Voltage regulator for bike generator
If one wants to build a bike generator to charge a 12V battery, a voltage regulator seems to be a smart choice. It makes sure that pedaling too quickly does not damage the battery.
But what about the ...
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