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.

Filter by
Sorted by
Tagged with
2
votes
2answers
851 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'...
2
votes
2answers
2k views

Which of the following motors best suit as a wind generator? [closed]

I'm watching some brushless outrunners with low kv as a generator for a simple wind turbine that I'm going to build soon. It might not be a scale or fully useful turbine, because I want to build it ...
2
votes
3answers
17k views

How to select most efficient motor for generator?

First post. Please forgive me if this is a stupid question. This post can be broken down into two questions. I am building a bicycle generator, but am new to the field of EE. I am trying to select ...
2
votes
2answers
1k views

Alternation of Magnet Poles in DC and AC Generators

I want to create a generator. The current design I am looking at has several magnets along a wheel, with coils around the outside of the wheel. The wheel then spins generating current. I know that if ...
2
votes
4answers
2k views

Alternator with torque proportional to angular velocity

Im interested in buying or designing an alternator/electrical generator that increases torque as rpms increase - is there an alternator design that increases resistance as rpm/angular velocity ...
2
votes
3answers
409 views

Is more fuel consumed immediately when spinning reserve is brought on-line?

Spinning reserve is additional capacity (reserve) that generators which are on-line (spinning) are able to apply to the grid quickly in response to a failure elsewhere on the grid, or a spike in ...
2
votes
1answer
884 views

Square generator 1KHz to 1MHz with 1KHz precision

I would like to make a square wave generator which will output a signal with amplitude X voltages and frequency between 1KHz to 1MHz, with the precision of 1KHz (for example: 785kHz, 926kHz, 999kHz, ...
2
votes
2answers
3k views

Using a motor as a generator: How fast does it need to rotate?

I have a dc motor with the following specifications: ...
2
votes
2answers
154 views

Simple Gas Generator question

I'm a bit new to this stuff so please excuse my elementary question. A gas generator rated at 700 watts and 120V puts out about 5.8 amps. Is it possible to step down the voltage to 12V with a power ...
2
votes
1answer
13k views

Will a gas generator survive an EMP?

Not really sure where to ask this question. I was watching an episode of a TV show involving a gas generator and it got me wondering whether electricity could still be generated by a gas generator ...
2
votes
1answer
83 views

Generator Frequency

How do I calculate the kW output on a generator when changing from 60Hz to 50Hz? i.e. if I have a 70kVA generator at 60Hz producing 56kW, how do I calculate what the kVA and kW's would be if I ...
2
votes
1answer
263 views

Working of a Doubly-Fed Induction generator (DFIG) in wind turbines

I am unable to understand how a Doubly-Fed Induction generator works (in Wind Energy conversion system)? I do not understand how the reactive power fed into the stator interacts with the rotor so as ...
2
votes
4answers
96 views

which generates more efficiently, single or 3 phase systems

I want to build a hand crank generator for my travels and I am curious if there is an advantage to a three phase "motor used as generator" design or if it will be around the same output to a similarly ...
2
votes
1answer
400 views

Vintage DC generator [closed]

this is a DC Continental Electrical C0. Model D16 generator that came with the Fairbanks Morse hit and miss motor I restored. It was used to generate electricity for a farm house. I can not find any ...
2
votes
1answer
2k views

triangular and square wave generator

the circuit below is a triangular and square wave generator. With the first stage (the integrator) I can generate a triangular wave, and with the second stage (comparator) I can generate a triangular ...
2
votes
4answers
1k views

What is capacitance required for this 3 phase rectifier

In the diagram above I want to know the value and the rating of the capacitor that should be used for good rectification The Line to Line voltage is 400 , and by relation Vdc =(3√2 VL)/pi=(3√2 x ...
2
votes
1answer
705 views

Why is there a different load current in two identical DC generators in parallel operation?

I am a university student. While we were performing the experiment of parallel operation of two DC generators, we noticed that the load shared by the two generators was different. The total load ...
2
votes
2answers
682 views

How to find I-V characteristics of motor?

I have a motor that I'm turning with another motor. I can determine the speed of rotation with a tachometer. One motor is powered with a power supply and it is coupled with another motor. I need to ...
2
votes
2answers
297 views

Load on a generator

I am really stuck on this and I couldn't find any references on the internet regarding this. When a load is connected to a generator, why does the current withdrawn from the generator increases. Since ...
2
votes
2answers
213 views

Given a source of mechanical input, can an RC motor charge it's own battery without extra cicuitry involved?

Background I took my RC quadrotor to a windy field this weekend to fly it around. After the battery died, I retrieved it and while carrying it back home, I noticed that the wind was spinning the ...
2
votes
4answers
661 views

Simplest 42.8 MHz generator

What is the simplest way of generating 42.8 [MHz] square (or sine) wave? I want to clock fast ADC for SDR purposes. I thought about wideband opamp and 10.7 [Mhz] cystal 4th harmonic. Is there any ...
2
votes
1answer
240 views

What could be this “transient electric deviation”?

On August 7th, 2011 a lightning hit a transformer powering one of Amazon EC2 facilities in Dublin. The status report said Normally, upon dropping the utility power provided by the transformer, ...
2
votes
3answers
66 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?
2
votes
3answers
104 views

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 ...
2
votes
2answers
3k views

What happens to a generator when we rotate it in open circuit(no load)?

What happens to a generator when we rotate it in open circuit(no load)? Let's say we have an old bicycle's dynamo without regulators, capacitors and battery. What happens if we remove the lamp and ...
2
votes
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
4k views

Power factor correction for LED lighting on a generator

I'm the electrician for a club that builds an illuminated carnival parade float, and historically we've lit our float using around 10,000 x 40w incandesant lamps powered by a 800kVA 3 phase generator. ...
2
votes
4answers
5k views

Brushless 3-phase motor (BLDC) in generator mode dropping current

I am making a winch that will spool out line under tension. I've had success using an old brushed motor. I short the windings, so that when I unspool the line, the motor provides braking torque and ...
2
votes
1answer
617 views

Why does the volatge drop is huge once a load is connected to a generator?

At no load condition the generated voltage at transformer secondary output is 140 V ac. When a 60W resistive load is connected the voltage drops to 27 V ac. The pmg generator rating is 1 KW 415 V and ...
2
votes
1answer
186 views

Temporary, high-power energy storage

I'm currently building a small, portable human-powered charger for supplying a 1W led. I salvaged a dynamo core from a torch, but I'm unable to use other components inside since the torch is only ...
2
votes
4answers
101 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 ...
2
votes
1answer
708 views

Torque control of a BLDC motor acting as a generator

I'm trying to build a dyno for electric motors. The dyno consists of two motors: a motor under test (MUT) and a load motor. The two motors are connected together through a shaft. On the shaft there's ...
2
votes
1answer
789 views

Ultrasonic generator - a couple of questions

Here is the ultrasonic generator circuit I'm trying to understand: It is powered by USB and it produces 100V at 100kHz on the piezoelectric speaker BQ1. Two ...
2
votes
1answer
571 views

Arbitrary Function Generator or DAC with memory IC help

I am trying to look for a hardware solution to my current problem. Currently I am using an AFG preprogrammed with a signal (example below, 8bit resolution is OK, using 30 or more data points each 1us ...
2
votes
2answers
636 views

Moving the magnetic field around a fixed conductor?

From this figure: And many others related to electromagnetic induction, the main component of motion would be the conductor perpendicular to a magnetic field. I know it's possible to have it the ...
2
votes
3answers
2k views

Meaning of “with respect to rotor and stator”

In the following example, when it says “with respect to stator” and “with respect to rotor”, did they mean the rotor part of the synchronous generator in both cases? Example: The excitation field in ...
2
votes
1answer
129 views

Where are the losses in an inverter-type portable generator?

I have an inverter-type portable gasoline generator that is rated at 3kW / 3.3kW surge. In the service manual, the engine's power output is said to be 4kW. (The engine's displacement is 269cc). I am ...
2
votes
4answers
118 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 ...
2
votes
2answers
156 views

How is “braking power” controlled with a regenerative braking set up?

As noted in the following question (How are current and voltage related to torque and speed of a brushless motor?) : Considering a 1000W motor: providing 100V/10A you'll be able to reach high ...
2
votes
1answer
139 views

I found a motor/generator thing at my school's storage. I was wondering if anyone could identify it

Im not sure what this is because it has both a commutator and a stator. It didnt have anything else with it. Im guessing it has something to do with ac generation.
2
votes
2answers
543 views

Measuring the power output of a hand-crank generator

I am working on a project which aims to compare the energy generated from a hand-crank, DC generator, to that of solar panels. The hand crank generator will not actually be powering anything, but we ...
2
votes
2answers
4k views

Alternator power factor on load and its effect on output power

Almost all alternator manufacturers test the alternator at 0.8 power factor. But when installed at a site for power generation, the working power factor will be around 0.9 to 0.95, due to the power ...
2
votes
1answer
2k views

Design a circuit for rechargeable batteries supplied by a solar panel and generator?

I want to design a circuit for a rechargeable battery (or batteries) that can be charged by both a solar panel and a generator. I am working on the same project as described here, but my focus is on ...
2
votes
1answer
206 views

How can I store energy from short pulses of current?

BACKGROUND: I am an intern with a local company. We have a powerful 60 KW Engine that runs throughout the day. We have a two Machineries that are powered off the Engine directly (using clutches and ...
2
votes
1answer
226 views

Help building electric generator?

I am in the process of building an electric generator for the first time, and I have found out most of what I need to do, except the following things. Can I have 2 rows of magnets linked together ...
2
votes
1answer
2k views

FEM: How to calculate impedance in stator circuit for loaded generator

I am modeling a synchronous generator and in the stator circuit consisting of 3 phases at the alternator output, I have resistances and inductances of the end windings. Thus I have a 3D approximation ...
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 ...
2
votes
1answer
111 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 ...
2
votes
2answers
92 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, ...
2
votes
0answers
111 views

High Frequency Pulse Rate Generator - Science Fair

( For our High School Science Fair) I am trying to find a pulse rate generator capable of producing 2.5Hz - 20,000 Hz utilize with over 10,000 LEDs all at once with several milliseconds in between ...