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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7
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6answers
34k views

What is back-emf: counter-electromotive force?

Could someone knowledgeable on the subject explain what exactly is this back emf? How is it caused in a motor/generator, which components and which effects determines it?
0
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1answer
89 views

Using DC generator as power source and switch in multi

I have the following: DC Generator 5V regulator lipo charger (5v input), 3.3v regulator, lipo battery device requiring 3.3v power I only want the battery to be connected to the 3.3 regulator (and ...
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2answers
43 views

Engineering books on generator and/or induction motor [on hold]

I recently got interested in learning about using induction motors as a generator and would like to learn more about them in a more "official" manner. So, are there engineering books out there that ...
-1
votes
0answers
17 views

How to generate custom nvm file for max7456 [closed]

i have Max7456, if there any software GUI tool can help us to generate graphically custom OSC characters
3
votes
2answers
134 views

Power amp for function generator

I have designed a function generator with the XR2206. That works well. I can take it up to 2MHz (sacrificing on THD, however). Where I have failed so far, is the power stage. I have a supply of +...
1
vote
1answer
52 views

What devices are required inorder to connect/combine various power generators together to supply clean power?

I am not an Engineer and hence will apologize in advance for the lack of technical terminology however I am attempting to figure out how to connect various power generators (for example, 1 or more ...
0
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2answers
99 views

Connecting a medium sized 1 kVA Inverter with a 2 kVA Generator

I have a 1 kVA inverter which is using a 12 V battery to generate 220 V AC (battery is connected to a charge controller and is being charged by a PV). In addition I've got a 2 kVA generator. ...
2
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2answers
2k views

Charging a 12V battery bank while using it

I have (4) 12V 190 Ah AGM batteries connected in series. I want to run a portable A/C unit through a 2000 watt inverter connected to those batteries and charge the batteries simultaniously with a ...
2
votes
4answers
117 views

Paralleling output of multiple BLDC motors used as generators

First of all, I apologize for anything stupid I say as I am not yet well versed in the proper technical terms and schematics. I wish to use several identical BLDC motors that will be spun at the same ...
1
vote
1answer
43 views

What's the phase relation between the sine wave and the sync output from a function generator?

I'm using a function generator to generate a sine wave, and am trying to use the sync (TTL) output to flash an LED at the beginning of each wave pulse. However, when I compare the sin wave and the ...
0
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2answers
91 views

Dc Motor giving ac as well as dc voltage when used as generator

When I rotate the rod or the moving part of motor and probe its output through a multimeter (set on ac measuring) it shows around 0.50 volts. When I set the multimeter on dc measuring, it still shows ...
0
votes
1answer
139 views

Limiting 14V current to 50A [closed]

Given multiple possible powerful charge sources without adequate over-current protection, and a very large (say 500 AH) depleted battery bank, using a very low resistance / high acceptance rate ...
0
votes
1answer
28 views

How does an optimized car battery charging system could be designed?

To start, I saw a scooter electrics. In that implementation, after quite a weak (in my sense) generator it has some shunt linear regulator, that just dissipates overvoltage to heat. Oh god! Weak ...
1
vote
2answers
54 views

Magnetic induction with varying rpm: Dealing with excess energy

I would like to get some advice regarding the following scenario: I want to build a cheap, small generator for an energy harvesting application. There are magnets on a rotating shaft and off-the-shelf ...
0
votes
1answer
115 views

Controlling alternator load for peddle bike

I want to create bike-powered alternator system to recharge 12 V batteries. People can only do about 300 W mex. To turn an alternator with higher torque requirements, especially when the battery it ...
2
votes
3answers
65 views

Why are core losses mechanical and not electrical in an AC power flow diagram? [closed]

The power flow diagram of a generator (a) and a motor (b) are shown. But why are core losses mechanical losses?
0
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0answers
25 views

Generator data for synchronizing

I have two DG sets which are to be synchronized on to the same AC bus and needless to say, they must share load. I have gathered some parametric data which I felt would decide how well these can work ...
-2
votes
1answer
45 views

If the torque angle of the generator δ = 18°, how much power is being supplied by this generator at the current time?

The internal generated voltage EA of a 2-pole, delta-connected, 60 Hz, three-phase synchronous generator is 14.4 kV, and the terminal voltage VT is 12.8 kV. The synchronous reactance of this machine ...
4
votes
5answers
142 views

DIY generator. Simple and small

I have read many posts on this site and everyone seems very competent, so here I am... very new to this. I'm trying to learn how to convert a motor into a generator. I'm just getting a bit overwhelmed ...
10
votes
2answers
167 views

Big discrepancy between theoretical and actual power through my pulse generator

I am trying to acquire some skills about pulse generation, but that's not easy. I've tried to derive the power dissipated by the input resistor in my pulse generator, but it turns out to be much ...
1
vote
1answer
67 views

Understanding function generator output when units are in dBm

I am using a function generator with output in units of dBm. It has an output impedance of 50 ohms. I am measuring this output on an oscilloscope, and am failing to understand the waveform's amplitude....
1
vote
1answer
127 views

Generated current in a \$3\times450\$ VAC \$60\$ Hz \$1150\$ kVA generator

Let's say I've a \$3\times450\$ VAC \$60\$ Hz \$1150\$ kVA generator. How much current will there be generated when it runs at maximum capacity? MY WORK: The total Active power over a three-fase ...
5
votes
1answer
74 views

Can somebody please explain to me the principle of a T-T Earthing system?

How are the transformer, consumer's side and the generator earthed in a T-T Earthing system? I seem to understand that the generator and its frame should be earthed separately; The neutral of the ...
0
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2answers
162 views

Sychronous generator vs dc generator

I am wondering, if a sychronous generator has a smaller posibility to be burnt (be destroyed permanently) from a short circuit, that has a dc generator with parallel wound or a seperately excited dc ...
4
votes
3answers
110 views

Free Piston Stirling Engine Tuning Capacitor - Series Vs Parallel

Why is a tuning capacitor placed in series with a free piston stirling alternator rather than parallel with it? I am accustomed to seeing power factor correction capacitors placed in parallel in ...
0
votes
1answer
100 views

Why does the electrical power of a generator that is close to the short-circuit fault location decrease?

I was reading about shunt faults in power systems in the book Fundamentals of Power System Protection by Y.G. Paithankar and S.R. Bhide and the following sentence confused me: "Further, in an ...
5
votes
2answers
907 views

Designing/Predicting Output from Permanent Magnet Motorcycle Stators

I'm hoping you can help me. I've long been into motorcycles, and have restored and customized many different bikes. While building custom motorcycles, I often add electrical accessories, and use high ...
0
votes
1answer
212 views

Driving a flyback with pure AC sine wave

I am quite confused about flyback drivers. I have a high frequency (up to 50 kHz) AC sine wave generator, and I would like to use it to generate some arcs on a flyback. So I thought I could just wind ...
1
vote
1answer
335 views

Grid tie inverter on Generator Set

I have a grid tie inverter powered by a 24V battery connected to a circuit that is on a Generator. The grid tie inverter syncs well and outputs 655 – 800W according to the Load. As the load changes ...
0
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0answers
41 views

Alternator field winding VS equivalent inductor

I have a question which I know is going to be more opinion biased than factual. I know this isn't the purpose of the forum, but I would really appreciate some extra opinions so I'm going to ask it ...
0
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3answers
69 views

Flat line on output of single supply sawtooth generator

I have built the following sawtooth generator using LM358 opamps: In simulation everything works fine, however in reality I get only flat line on output. Anyone got any idea what's going on?
14
votes
3answers
3k views

Why is it harder to turn a motor/generator with shorted terminals?

The shaft of an unconnected motor is easy to rotate relative to a motor with shorted terminals. If a resistive load is connected to the terminals, the turning difficulty is somewhere in between. Why ...
0
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2answers
65 views

Using solar with a 3 phase motor to generate stable 3 phase current

I have a 220 V 100 hp electrical motor. I initially had a plan to use the grid 110 V through a step up transformer to get to 220 V along with a 480 kVA capacitors to kick ...
0
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0answers
102 views

AC water turbine

I am trying to use a water turbine from China to charge a lithium ion battery. The water turbine is rated to 10 watts. I figured that should be enough to charge the battery but I can only ever get ...
0
votes
1answer
46 views

Permanet Magnet Generator - Torque

I am working on a project with a gas engine at constant speed of 1500RPM to drive a permanent magnet generator with magnetic ball bearings. - SKF.function is GENSET - PM generator is water cooled. - ...
2
votes
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, ...
0
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0answers
54 views

How does this stator work?

This stator is out of a Wisconsin VG4D gas motor. Both black leads go to a rectifier. Red and white leads go to a regulator. White lead pigtail goes to ammeter gauge and on to battery. I need to ...
14
votes
4answers
7k views

Advantage of using AC generators in cars instead of DC generators

Most cars use an AC generator then convert its voltage to DC via a bridge diode rectifier to charge the 12v battery. Why wouldn't a DC dynamo be used instead? Is it because AC dynamo gives better ...
1
vote
2answers
83 views

Is there a motor design where a rotor gradually moves into a stater? [closed]

I was wondering if there is a motor/generator design where the rotor moves gradually in and out of the stator along the axis of rotation, or the stator over the rotor, but the primary motion is rotary,...
0
votes
2answers
73 views

Impedance matching and reflection

I have a simple question about reflection and impedance matching. Consider a voltage generator Vg with its output impedance Zg, and suppose it drives a load Zl. In order not to have reflection, we ...
0
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2answers
74 views

Magnet Shake Generator - how to replicate in LTspice?

I made a generator for my wife's 3rd grade class, since they are learning about magnets, electromagnets and electricity. It's a simple pipe with a stack of magnets inside and you shake it to produce ...
0
votes
1answer
536 views

How to Find Angle of Armature Current

Two identical three-phase, Y-connected, synchronous generators are connected in parallel to equally share a load of 900 kW at 11 kV and 0.8 pf lagging. The synchronous impedance of each generator is 0....
0
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1answer
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
0
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4answers
45 views

How do you drive a variable reluctance stepper/SRM as a generator?

I think I understand the principles, even if not the details, of operating a VR/SRM as a motor. But I don't understand, and can't find any good explanation online of, the principles for how to use one ...
1
vote
0answers
171 views

Is this stackable low RPM generator design viable?

I'm trying to invent viable hand-crank energy generator for charging phones and similar low-power appliances. I want to avoid gears altogether in the design, because they are hard to manufacture at ...
2
votes
2answers
18k views

Parallel generators don't divide reactive KVAR load equally

We have three generators cat 3412 800kW at our power station. They load in synchronization. But we have a problem in the sharing of the reactive power KVAR. The voltage regulator used in the system ...
0
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3answers
2k views

Raising Alternator Voltage

Does anyone have a good idea on how I could raise the voltage from a 12v car alternator to 48v dc for use in a 48v wind system? Could I put a dc negative voltage of 36v into the regulator field ...
1
vote
0answers
59 views

Generate energy from waves that move my ship?

I'm currently building a small solar powered robot boat. I expect it to work fine (because why not.. :-) ), but I'm already looking for other ways than only solar panels to generate electrical power. ...
1
vote
1answer
48 views

Loading an Asynchronous Generator

I am doing an experiment that involves loading an asynchronous 50 HZ generator. For the load to consume current it has to be a capacitive load to cause a phase shift between the current and the ...
2
votes
1answer
40 views

how to confirm that PCB Ethernet layout does not affect perfornace

short version: - How to test if ethernet traces on PCB causing any distortions to the signal? - Is it possible to generate ethernet signals from a windows computer and measure them with an ...