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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 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 ...
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3answers
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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?
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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 ...
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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 ...
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61 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 ...
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101 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 ...
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1answer
43 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. - ...
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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 ...
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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,...
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66 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 ...
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64 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 ...
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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 ...
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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. ...
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1answer
47 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 ...
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1answer
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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 ...
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1answer
34 views

240v dc connected to 24v dc battery bank

1.I connected my 3 phase ac pma generator/hydro turbine to a 600vdc rectifier. As I opened the water nozzles the generator produced from 38vDC to 213vDC.How do I connect to my 24vDC battery bank ...
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3answers
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Generate a false encoder signal CW/CCW 1/4 shifted

I need to generate a 10-100khz square signal freq. to simulate an encoder. I'd like to be able to simulate CW and CCW, shifted by 1/4 th signal. I've thinked about a crystal with a pot and some logic ...
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2answers
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Is it good idea to charge a battery from a starter-capacitor of an AC generator?

Some friends and I took a working electric motor out of an electric lawn mower. We suspect it is a single-phase AC induction motor (correct me if I'm wrong) with a starter capacitor (pictures above). ...
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What is the reasoning behind the transient circuit for a synchronous machine short circuit?

Assume that a 3 phase symmetrical short circuit occurs at the terminals of a synchronous machine working at no load and constant speeed. The machine is characterised by a field winding fed with a DC ...
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1answer
29 views

How can I create a moped DC source from the alternator using the chassis as common GND for both AC and DC?

I need to convert from AC to DC the output of the red wire coming from the right stator coil (marked with R) which is the one that feeds the lamps. The idea is to convert to DC then regulate the ...
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2answers
521 views

Best most efficient motor type to be used as a DC generator

I'm trying to design a system that requires a very light weight very efficient generator to be used from converting rotational motion into DC voltage(for say charging batteries) As far as I know BLDC'...
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1answer
100 views

LTSpice: active load current generator soft saturation

I would like to use a current generator to pull down the voltage to zero (there is a voltage generator with a series resistor). The current generator models the output of a specific circuit, so it is ...
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1answer
63 views

Mechanical to electric to mechanical… Power loss to expect

I have a 3hp lawnmower engine. My engine hypothetical rpm range from 3k to 6k. If I was to connect it to a generator or motor with similar power rating at similar top rpm, lets say a 2000 watts ...
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1answer
197 views

DIY rotary inverter technical and economical feasibility

I’m setting up a solar panel system (200W) that’s used to charge batteries that will power small appliances in a converted van. Solid state inverters are expensive and difficult to fix and it seems ...
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1answer
85 views

Earth Ground Portable Generator

I recently bought a pure sine wave 2kV portable generator to use for camping. In the manual it states that the generator should be grounded to actual earth through a metal stake and then attached to ...
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2answers
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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 ...
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1answer
50 views

Is it possible to design a three-phase delta generator only with two generators? [closed]

I've always seen 3 generators in a three-phase generator, but this question came to my mind. I've tried to add an element instead of the third generator, although with no result. I hope someone can ...
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Automate Manual Choke in Generators

I want to know any ideas to make an auto choke for my home generator. I have an automatic transfer switch (ATS) installed which turns on/off the generator. Most of the time, it is not necessary to ...
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1answer
34 views

Question about motor and generator size [duplicate]

For a given power, which will be larger, a motor or a generator? Is there a certain relationship between motor/generator size and power?
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52 views

Why aren't homopolar generators more commonly used?

In particular with the advent of HVDC(high voltage direct current). Using mercury(metal), the resistive losses can be greatly reduced. There has even been some experimental research into neon plasma ...
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1answer
62 views

AC Generator for maximum load [closed]

I just bought a Honda Generator Model# EG 6500CL, with the setting on 110V only, I want to deliver the maximum rated current of 45.8V to one load. There are 3 receptacles available, 2 at 20A, 1 at ...
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1answer
53 views

What happens in a generator so that we get a sinusoidal voltage as an output?

I read this online, " For a travelling magnetic field in a circle, the induced magnetic field in the armature of the generator will be sinusoidal. That's why the generated voltage is a sinusoid, ...
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59 views

To run 1.5 ton ac [closed]

i want to run a 1.5 ton ac through dynamo and generater(that run a dynamo) for that purpose how much KVA dynamo required and also a diesel generator(how many hp/KVA) will be required. NOTE:- generator ...
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1answer
57 views

Power of supplied by generator when it is loading

I have a cummins generator which is having capacity in name plate as 803 kw. While running the load test, each phase current shows 153 A, 53 A, 120 A and neutral current 27 A or something. How can i ...
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61 views

I need advice for my project

My name is Clement and I'm from Malaysia. I'm currently studying for a diploma for electrical engineering. For my program, I need to design and make a mini portable genset. I have bought all the ...
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1answer
39 views

Synchronous Generator EMI

In the attached image below, I don't understand the text and phasor diagram that I have highlighted in yellow. Why does the induced emf on the armature winding lag the magnetic flux of the ...
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1answer
133 views

Synchronous generator induced EMF

I have started studying synchronous generators in more detail of recent and I'm finding it difficult locating helpful information regarding their operation. What is the formula that can be used to ...
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1answer
74 views

Designing a windmill [closed]

As a pet project I'd like to make a small windmill. I'm in the very beginning stages so I'm still researching components to use and have a lot of questions so I came here to start my journey. I was ...
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1answer
36 views

Is there a limit for voltage a PM generator gets to based on RPMs?

I build different small PM handcrank generators for fun, Recently I built a single phase generator and printed myself a couple transmissions. Now as far as I know 3 things affect voltage, speed of ...
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1answer
75 views

What should be switching voltage rating of relay in a 380VAC 3 phase system?

I am hooking up a system where there is 2 sources of power available. One source is the grid power, and the other is a generator. The grid provides me with 3-phase 380VAC with a neutral wire; and on ...
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Maximum battery bank capacity chargeable with a 2000W inverter generator

Using a 2000W inverter generator, what is the maximum capacity of a 12V battery bank that it is capable of replenishing if left on constant charge? In theory I assume that at 12V, a 2000W generator ...
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1answer
54 views

Safety Rule: Sum of wire lengths over two phases may not exceed X. What is this for?

Everybody knows various flavors of the rule "don't connect too long electrical lines to an outlet / generator / whatever". They sometimes come in the form of "don't chain your extension cords". As far ...
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1answer
39 views

How would I limit speed of dc motor being used as a generator?

How would I limit speed of a DC motor being used as a generator? For a project where I have to make a wind turbine that will automatically limit speed of rotation once past a certain value. Thanks :)
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271 views

Question about hooking up two generators in parallel

So I read this question: Hooking two (gasoline) generators together to make 220VAC And it’s close to what I’m wanting to do but not quite. We had a power outage due to weather. I purchased a ...
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1answer
72 views

How much power do power stations in parallel supply?

In modern power systems, the power is supplied by effectively connecting multiple generators in parallel. However, not all these generators are equal, some stations supply more power than others (I ...
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1answer
155 views

i want to duplicate a signal generator output

I want to duplicate signal generator output to dual. since i want to use same signal to two different place. Is this possible without amplifying and inverting the signals. Let me share some circuit. ...
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1answer
414 views

Calculating number of coil turns for a generator

I'm building a generator for a school project. I'm planning to use N42 neodymium magnets with performance of 5100 Gauss, How do I calculate what diameter of copper wire I need to make the coils and ...
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connecting 3 one phase Generator to get three phases

I have a big welder machine that needs around 26 kW and three phases. A generator for this power is a little bit expensive and take me a while to import one. When you are in a complicated situation ...
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Hook up an automatic transfer switch with two phases only

We have a house in Haiti connected to the shore line. The shore line isn't always working so we bought a generator. I wanted to ground one of the two phases to create one neutral, one phase and a ...
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4answers
98 views

Generator to home wiring

I live in South Florida an as such need to have generators for hurricanes. I have 2 Generators, a small 3300 Watt Inverter and a big loud 9000 Watt generators. Edit: My plan is to use only 1 ...