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 TT system with generator [closed]
It is a simple concept TT system (each phase is 240 V).
Please mention any mistakes/problems in this system.
I talked to some local electrician and they said it's ok.
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Should I use a ground rod at the generator? [closed]
Should I use ground rod at generator or not? My transfer switch also cut off neutral from mains.
Lightning almost never occurs in my area.
My main concern is electric shock protection from appliances.
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Is overvoltage possible in a grid with only rotating generators?
On the 28th of April 2025 a major blackout occurred in Spain and Portugal.
The European transmission grid operators provided an analysis report describing what happened that day without identifying ...
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Why rotor coil (winding) of a generator doesn't short circuit
Why rotor coil (winding) of a generator doesn't short circuit after long time..
We know an inductor become short circuit when dc current supply in it for a long time.
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Using small transformer for large generator
There are 12 transformers used in MATLAB's IEEE 39-bus system example, and every single of them is rated at 100 MW apparent power (default value) even though they are connected to generators having ...
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MCU data logger design without any power supply/batteries
Assume we are to create a simple MCU data logger that will record the amount of times the apartment door has been opened. Door has a small SPDT limit switch fitted, which pulls the pin of the MCU low ...
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Winding Turns For a Very Small Generator
I'm building a small generator to power an LED. Basically a magnet will pass by a coil to power the LED for an instant.
For my question, you can imagine any suitable input variables (diameter of wire, ...
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Running a three-phase AC generator at varying RPM and output voltage?
I'm volunteering at a non-profit railway museum where we're rebuilding a 1940 45-ton diesel-electric locomotive. Currently, it has a diesel engine that, in proportion to the throttle position, runs ...
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How to calculate overall THDi and THDv for a group of non-linear loads?
I'm working on a project involving multiple non-linear electrical loads, and I want to estimate the total THDi (Total Harmonic Distortion of Current) and, if ...
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THDV and voltage dip for generator sizing
I’m using the Cummins GEN SIZE website to perform generator sizing, and I’d like to understand how the software calculates THDV% (Total Harmonic Distortion of Voltage) across all load steps. This ...
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Use small generator to mimic power from a CR2032 battery [closed]
I wish to manually turn a small electric motor to use it as a generator. I wish to use this generator to power a radio transmitter that is normally powered by a CR2032 coin cell battery. When I ...
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What kW generator is required to run a 20hp motor?
I am trying to build a machine which will use an AC motor driven by a generator. I hope to build the prototype with no battery and run the power directly from the generator to the AC motor.
I need ...
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Unbalanced 3 phase load on engine generator : what consequences?
Short version :
What happens when connecting a very unbalanced load on a 3 phase engine generator?
Long version :
On the product we are developing, we use a 380VAC (3phase) to DC converter.
On ...
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Motorcycle Regulator Rectifier using buck converter method
please help me as a beginner. (Maybe I will copy the same question on several forum sites to add references)
I am making a regulator rectifier (RR) for a motorbike that uses the buck converter method. ...
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Capability curve of synchronous generator
What is the equation that better describes the lower bound of capability curve which is core end heating limit as shown in this figure from Wikipedia 'Capability curve' :
Wiklipedia
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How do I power this RC-300 Sputnik Soviet-Era 1971 Signal generator
Reducing this to one answerable question. The rest can be answered in other questions.
I wish to "power-up" the equipment shown in the photos (some details below).
How can I do this while ...
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modern remote interlock?
Sometimes we want mutual exclusion at different physical locations in a distributed electrical system. (For example, a remote interlock for a generator. There are Kirk key systems but these are too ...
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Voltage drop from magnetic generator to inverter
I have a three phase, 4000 w magnetic generator that is attached to a bridge rectifier. I have a 5000 watt inverter I am trying to use. When the generator spins and creates electricity I noticed ...
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How do I determine the Kv for the BLDC generator
Correct me if I am wrong, motor velocity constant Kv can be used to calculate the RPM required to generate a certain voltage (eg. if Kv=1000 RPM/V, at 4000 RPM, 4V is generated.)
I have the RBM-4849T ...
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How to draw stability limit curve of synchronous generator?
I am looking for equation to stability limit curve alongside inverted v curves of a synchronous generator.
Here is an example of this curve from page 483 of the book: "Electric Machines" by ...
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Low Power Battery Charging System
I have now updated my system based on the feedback received but now have new questions.
To recap, I have developed an electro-mechanical system (for proof of concept) that generates an AC signal at 5....
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How to calculate size of a 3 phase induction motor?
I have a 100KVA,400V, 60hz generator set on which I need to calculate the size of a 3 phase induction motor to be used without generator overload/shutdown. 144.34A is generator full load current.
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Charge controller for small lithium Ion battery under load
I am wanting to use a 3-pahse brushless motor to charge a lithium ion button battery LIR2030 whilst the battery is under load. The load is a MCU with some storage possibly a blue tooth module (we'll ...
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Efficient rectifier for bike dynamo, LM74670
The question is relative to bike dynamo (actually an alternator) rectifying, the main goal being to minimize power loss. The system being mounted on a bicycle, space and weight are also a concern (so ...
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Inverter/generator produces 120 VAC, I need 240 VAC with center tap (neutral)
My generator produces 31 amps at 120 VAC so I have been looking at 3/5 kVA step up transformers with 120X240 primary windings and 120/240 secondary windings. Problem is I am cheap and these things are ...
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How does the law of conservation of energy hold in the case of a simple linear DC machine?
Consider a simple linear DC machine as shown below:
Assume that the linear machine is initially running at the no-load steady-state conditions where the current is 0A, the magnitude of velocity |v| ...
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kWh Calculation, 208v 3 phase
I data logged a generator for a little over 5 days at the 1 minute interval, 7332 samples.
I am trying to calculate the total energy generated during this time. So I have L1,L2, and L3 Amps, kW, and ...
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I don't understand where the number 35 MW comes from
I don't understand where the number 35 MW comes from.
Thanks for your answer.
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Total power generated by a 3 phase motor. Please check my working?
I'm driving a 3 phase motor with a turbine, and across each pair of terminals I have applied the same resistance, R.
I measure the root mean square potential difference, V_rms, across terminal 1 and 2 ...
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How do the capacitors affect the performance as a generator of a permanent magnet, brushed DC motor?
I have a 24V 24A brushed DC motor (from a old pump so quite big in size).
It has permanent magnets on around the coils, and the coils are wound around iron.
Just like many brushed DC motors it has ...
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How to measure the voltages of a three-phase generator
I have a three-phase generator and I want to measure the voltages of each of the phases, but I don't have a neutral point. How would I connect the phases to an ADC, and how would I make a voltage ...
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Generator With Adjustable Resistance
I'm currently working on a project that uses a DC brushed motor (24V, 350W) as a generator. I want to be able to adjust the resistance of the generator. The device will be battery powered, so ideally ...
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DC generator and armature reaction and interpole
The magnetic field produced by the interpoles opposes the armature reaction field and works to shift the MNA back toward its correct position. Therefore, the magnetic fields from both the interpoles ...
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3 Single Phase Full Bridge Rectifiers for 3 Phase Rectification
We are trying to get rectified output from a star connected 3-phase generator. Line to neutral voltage is 230Vrms. We have tested using a 4 diode full bridge rectifier between one phase and neutral to ...
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Why is my inductor behaving like a capacitor?
I have an inductor coil (3 spools are connected in series) & I wish to find its inductance.
I tried using a multimeter to measure the ...
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Does an array of Peltier module need a diode between each module?
I have a bunch of Peltier module that I wish to connect in series/parallel and use them as a thermopile generator. However I was wondering if its necessary to attach a diode between each module (see ...
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I am running 10 kVA alternator from 10 hp motor and need some technical clarification
Here is my equipment:
I am using solar controller to run motor which runs alternator which generates electricity and which is used for my house 🏡 requirements.
10 kVA single phase 220 V, 50 Hz @ ...
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Maximum power transfer with constant source power
I am running tests on a stepper motor used as a generator. The stepper motor is directly coupled to a motor, which I can control with an ECS. In the ESC's software, I can choose to drive the motor ...
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Finding power rating of stepper motor used as generator
I have a stepper motor that I want to use as a generator for a micro wind turbine project, and I need to know how much power it can generate.
The stepper motor is a 57BYGH420 for Wantai Motor, and it ...
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Oscilloscope Low Sampling at uHz Sinus Signal
I tried to measure a sinus signal at 1000 µHz with my R&S RTC1000 oscilloscope (bandwith 300 MHz). The function generator that I used was the EDU33212A. I set the T/div=100s and the oscilloscope ...
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Supply voltage of BLDC motor increases during operation
I need some clarity on an issue I have been encountering with my BLDC motors.I am using 2 integrated driver BLDC motors to drive an RC truck sort of device, they run on 24v.
For the most part it ...
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function generator outputs - difference between 50 ohm and 600 ohm
I am trying to use a PCI-Quad04 board to count pulses (from a rotary encoder). In order to test out counting, I have a 1000Hz square-wave signal from a signal generator (BK Precision, 3011B) as ...
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Trouble getting current form BLDC generator
I am designing a battery charger using a BLDC motor attached to stationary bike, I was giving this project hoping to fix the current output because is delivering low amps to the charger even at ...
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Questions About My Perpetual Motion Idea [closed]
Before you read any of this, this is just an idea. I am not an electrician, I am not a contractor, I am not a physicist, or anything like that. I just have an idea that i think could possibly work. I ...
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How can I smooth the output of a DC motor used as a generator?
I have a small DC motor acting as a generator, spinning at 500RPM. From it, I get 1V with ½V ripple, which a 1000uF electrolytic capacitor smooths nicely.
I may wish to drive the motor in reverse, ...
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Creating higher voltage from DC motor
I have a DC motor (5 V, 600 rpm). I use it as a generator. It produces near 1.5 V max.
This voltage may differ while using it in the application and I can't control it. I want to raise this voltage to ...
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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???
