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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5answers
5k views

Is it safe to touch 200 volts DC?

I was watching this YouTube video. The content maker simply declared that 200/300 volts DC is safe to touch. I think the capacitor used in that circuit is limiting the current. That's why nothing ...
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1answer
33 views

Received a new Tektronix AFG1022 function generator, I would like to see if I could output a higher amplitude using a transformer or amplifier

I'd like to operate in a 0-12 V range, I would like to see what the best option would be to increase the voltage at the output. Our maximum frequency is 1Hz if there may be an issue with attenuation.
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1answer
75 views

How to test power output of an 8.5kW generator?

I found a very cheap 8.5 kW AC generator which works on gasoline. Produces 220 V, 380 V and 12 V as output. Some people online say is fake and it can't have 8.5 kW, that it actually has 2 kW and the ...
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1answer
31 views

What electric setup do I need to get electricity from a BLDC motor?

I'm trying to create a small scale wind turbine for a project. I plan on using a BLDC motor with some blades on it to capture artificially created wind. I'm new to electronics, but I was thinking of ...
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In a non-magnet, excited-coil generator, what percentage of the generator's total output is used to excite the coil?

I am building a DC permanent-magnet generator with the magnets in the rotor. The stator coils are my unique winding. The overall efficiency of the generator is measured with a digital torque meter ...
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1answer
29 views

DC generator circuit

total novice here so forgive me if I sound daft. I’m currently building a circuit that is using a small DC motor in reverse to charge a battery. One like the Anker Powercore type. I currently have 2 ...
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2answers
44 views

Minimal information energy conversions [closed]

I am trying to make a generator and before making it, I would need to know how many kWh it generates, in order to make sure it is actually feasible or if I should redesign it. I am just a highschooler ...
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0answers
58 views

Voltage/Frequency characteristics as a motor dies off

So, hopefully this is a simple enough answer for someone. I was recently posed a question concerning the coastdown characteristics of a pump as they pertain to the trip setpoints of a breaker. One ...
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1answer
84 views

Attempt to build DIY high current power supply from car alternator?

Recently I had posted about a thread related to a bench DIY high current transformer 12VDC supply that I'm trying to built. But due to some transformer and diode rectifier limitations that project may ...
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0answers
64 views

Windmill 3 Phase AC control PCB

I've created a PCB for my newly built 3D printed Windmill. Now I am not entirely sure about all the components and the way they function, so I'd like to have your opinion on the circuitry before I ...
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1answer
33 views

120v house equipment with 240v generator question

Tornado took out power around here for a good while. Parents aren't here and I'm stuck with the task of hooking up a generator. I'm not savvy with this stuff very much at all. Here's the issue. The ...
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2answers
56 views

Varying PMDC motor shaft rpm, how does it affect efficiency?

I am working on a project to harvest electrical power from a rowing machine by connecting a permanent magnet DC motor to the flywheel of the rower. However, my knowledge of electrical motors, and ...
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0answers
17 views

Transmission Bus Admittance Question

I have a question about calculating the admittance between buses in the single line diagram shown below: The solution I have been given shows that the admittance between bus 2-2 is found by adding ...
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2answers
40 views

Engine driven EDF

We all know that an electric motor can be reversed to generate electricity. My question is, will it work the same way if I were to do this in an EDF? The EDF that I’ve been watching, is producing 35 ...
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3answers
535 views

Hybrid gas electric drone

I have a nitro engine that’s idling at 1600 RPM. As the title says , I also have a BLDC coupled directly to the nitro engine working as a generator. That generator is capable of producing 3.5kW of ...
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0answers
18 views

Design of synchronous generator with traezoidal back emf

I want to design an ac synchronous generator that has trapezoidal back emf. However, the synchronous generator has to be wound-field, i.e. no permanent magnets for field excitation. Is it possible to ...
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1answer
59 views

Given The Same Load, Will A Larger Inverter Generator Burn More Or Less Fuel?

I'm looking to buy an inverter generator for backup of a few essential devices during power outages. I've already tested for & calculated my required wattage (including starting wattage where ...
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1answer
23 views

Generator sizing for water pump

I'm trying to size a backup generator for a water pump system. The pump is rated 3HP / 230V / 13.5 A So it seems that I would need a ~ 3KW generator on a steady state. However, I'm aware of the ...
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2answers
73 views

How to combine high voltage and high current source? [closed]

Can whimshurst machine (high voltage and low current) and homopolar generator (high current and low voltage) be connected in parallel to draw high watts? Please explain the process & flow of ...
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1answer
28 views

Generator Output at different frequencies

If a three phase generator is stated as 200kVA, 440V, 60Hz therefore a current output of 262A. If said generator is changed to deliver 50Hz power at 440V, would that reduce the power available? so the ...
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2answers
232 views

Converting power and speed of a bike axle

We want to convert the speed and power applied on the pedals of a bike to convert it to an digital signal. But we need to apply an variable load to simulate cycling up-/downhill. My initial thought ...
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1answer
34 views

Calculate properties of electric generator?

I've got a miniature DC generator with 10 coils. If I knew the generated power and the size of the rotor, how would I calculate its RPM? Which other variables would I need? Is there a general formula ...
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0answers
51 views

What happens when you put two rectifiers in series to get DC from a stepper motor?

For a project a stepper motor is used as a generator because of the decent amount of power at low RPM. Now have found that one rectifier is sufficient when placing the coils in series. First however, ...
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1answer
28 views

How does conduction angle through a bridge rectifier affects generator performance (vibrations, etc.)?

Consider this scenario: A 3-phase permanent-magnet generator is being driven by a strong force and at varying speeds e.g. 1000-6000 RPM Its output is rectified via a 3-phase bridge rectifier The ...
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3answers
77 views

What is the noise figure of a signal generator?

I'm wondering what's the noise figure or the overall noise contribution of typical signal generators? For example, if there is a test system with a signal generator that outputs 3 dBm signal (50 ohms),...
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40 views

Earthing portable generator directly to earth pin of powerpoint?

I have just bought a generator was wondering is there a reason I cant ground it to the earth pin on a power point in my home? Im thinking a cable with single earth wire and power plug on the end so I ...
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0answers
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Does transformer line side voltage varies with backup generator on load side running at from 0 to 100%?

We have a transformer of 750 KVA with 5.75% impedance. On the load side we have loads and a back-up emergency generator. This emergency generator is capable of supplying the loads and still export ...
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0answers
43 views

How do I calculate the Output current of a generator?

I got this axial flux generator form China for a small wind project. How should I calculate the output current (rated current) of this? I basically need this information for sizing the wire. The ...
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1answer
38 views

How do I calculate the regulation of the generator in a Ward-Leonard system?

I have a DC motor with independent excitation, power by a ward-leonard system. The nominal voltage applied to the motor is 250 V. I have to calculate what regulation(%) to apply to the generator so ...
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1answer
46 views

Is there a RF signal device for a 120 or 240 vac wire to start and stop a standby generator?

Our standby generators automatically start when a switch in the automatic transfer switch closes and the gen stops when that switch opens. Usually we bury 2 16ga wires along with two 120/240v hot and ...
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60 views

Bulk power markets hour ending convention why?

Is there an engineering explanation for the hour ending (HE) convention common to US Independent System Operators (ISO)? For example, hover over any MISO real time market data and they will show the ...
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1answer
61 views

How to wire a single wire alternator to a bridge rectifier?

I'm trying to make a 25cc weed eater generator (for fun) and I'm thinking of using an alternator to take the rotary output from the engine and turn it into electricity. I need a way to take the 12-14V ...
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3answers
1k views

Function generator in the nano or micro volt range

I'm looking to get a hold of a wave function generator that can produce signal in the micro or nano volt peak to peak range. The lowest I've been able to find is in the millivolt range. Do these ...
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0answers
59 views

Ripple on tens-millivolts sinus waveform

I’m trying to make a DDS to generate a sinusoidal signal with tens to hundreds of millivolt amplitude and hundreds kHz frequency using an LTC1666 DAC. But I have some confusing results. Device ...
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3answers
48 views

Hypothetically, 6 or more phase line with same mechanical energy?

So I don't understand a concept of mechanical to electrical energy conversion. Let's assume I have a 3-phase generator and need X amount of mechanical power in order to get 200 Volts Phase-Neutral. ...
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2answers
168 views

How to generate 100 A at 20 kHz?

I have interesting problem to overcome and seek some advice. I need to test different hall effect sensors and magnetic cores. I am currently stack at issue of bandwidth. I tested sensors at DC using ...
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1answer
56 views

ac/dc coupling and DC offset to read DC voltage in analog oscilloscope

A function generator is connected to an analog oscilloscope. I can see a sine wave. Can I read DC voltage with the help of DC offset knob? If so, can the minimum DC voltage be negative?
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1answer
88 views

Gaussian filter circuit

I want to convert a 10 MHz train of square wave, 3.3 V to a Gaussian pulse train of the same frequency and amplitude. This Gaussian pulse will be sent into an electro-optical modulator where it ...
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2answers
367 views

To what extent are alternators “flexible” to variations in input speed and output voltage?

An automotive-style alternator works from 750 RPM to e.g. 7000 RPM, a range of nearly 10:1. In terms of output voltage, I know they target a fixed output voltage, but I believe it wouldn't be too ...
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1answer
66 views

Converting Magnetism to electricity

I've been seeing a lot of videos online of people using neodymium magnets to make a motor spin to generate electricity. If we can generate electricity from magnets why isnt this being used more often?...
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3answers
86 views

Adding poles to motor

I just recycled this motor and I would like to use it to generate and charge at 60 V. It’s rated at 6350 rpm at 95 V. It's a brushed DC motor. It has two poles. Is it possible to remove the two ...
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1answer
123 views

Oscilloscope scrolling

This questions is kind of related to this: Prevent oscilloscope scrolling However, now I have a decent signal generator (well still budget, but for my needs more than enough, FeelElec FY6900, 60 MHz ...
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1answer
51 views

Circuit to run a 3 phase magnet generator as motor?

I am trying to convert a wind generator to a brushless motor. As you can see at the image, it has 16 magnets and 12 coils. The coils are connected as 3 phase, star connection, so I have 3 output ...
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1answer
51 views

Formula for how much power a motor generates

I'm interested in the formula for how much power a handcrank motor can generate. I dont know much about electrical engineering but I'm assuming it's related to a few factor. The speed on which you ...
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4answers
80 views

Torque of motor vs operation as generator

While trying to work out which motor to use for a wind turbine project, I'm coming across torque numbers for DC motors. I'm mainly looking at a BLDC motor right now. Clearly, for a smallish turbine ...
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1answer
86 views

Why does rotor of synchoronous generator accelerate during faults?

I don't understand the electrical torque in a generator. Isn't the counter torque related to the armature current in the generator? Why does electrical torque decrease during fault in lines that ...
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0answers
30 views

How can I calculate the power capacity of a AC to DC converter?

This seems off topic, but will explain why I need to do what I am doing. I'm currently homeless, but need to build a generator on the cheap. I have a camper that uses 30a service. I have an ...
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5answers
2k views

Why are Marx Generators built like that?

Short introduction: A Marx Generator is a capacitor arrangement that transforms a DC input voltage of let's say 1 to 20 kV to a multiple of that. Capacitors get charged in parallel and when they ...
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Simplifying Salient Machine Impedance Parameters to Classical Synchronous Machine Model

I have a data sheet for generator impedance that specifies the quadrature and direct axis impedance for a salient machine. I'm not really interested in fully modeling the machine's for stability ...

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