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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19 views

Calculation of current generated by generator when no load is connected

I just started 3-phase circuits and in my book it written that "for a delta connected coils of generator, in a balanced system the resultant emf in the closed circuit will be zero and hence there ...
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145 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 ...
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Does using electronics with poor power factor affect the pulse power capability of a generator rated for a certain KVA?

The situation is such: There is a multi-pole, three-phase, permanent magnet generator (rated for 100 KVA, let's say) that feeds into a simple diode rectifier with a capacitive/DC Voltage load (...
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63 views

What is better for a generator: high voltage or high current?

I am making a hand-powered generator for an industrial tech assignment by taking a motor and reverse engineering it. Before I start building the prototypes, I want to mess around with gear ratios and ...
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45 views

What governs the output voltage of a three-phase generator?

If you have a three-phase generator (or motor run as a generator), what part of it governs the output voltage? For example the speed at which you rotate the shaft governs the output frequency, but ...
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609 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 ...
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160 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 ...
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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 ...
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Creating a 1PPS signal froma a 10 MHz CMOS Output Signal

Is it possible to "create" a 1PPS signal using an Agilent 8165A signal generator? We currently don't have a way of testing a 1PPS signal directly, so we're looking at "making our own&...
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38 views

Why stationary armature is preferred for commercial use

While reading a book on electrical machines, I found a point that says that for power generation, a stationary armature is the preferred type. If in any generator, there must be moving parts, why is ...
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Circuit giving values on both AC and DC

I have a generator stopper which works on 220 volt AC (in India 220 volt AC is normal supply) and has an electromagnet which pulls up a lever and the generator is stopped. It works perfectly when the ...
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59 views

Synchronous Speed

What is the difference between an induction motor and a generator as far as synchronous speed is concerned? If they both run at 60hz how is the generator providing power while the motor uses the power?...
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Alternator output rating

Overview: I am currently working on a project that requires a 24v alternator, which is powered by a mower engine. This engine in particular runs around 3,000 RPM, and does not exceed 3,200 RPM (based ...
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Reduce 32 amps generator output to 10 amps

First you need to please understand that I am a truck driver, I lift heavy things and have a smaller brain pan than you good readers. Aka; not an intellectual that understands elictrickery. While on ...
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58 views

What is the actual direction of real current in an A.C. generator? From the North pole to the South?

I see diagrams of a current being generated in a loop or square-ish section of wire that is rotating between two magnetic poles... a north on one side and a south on the other... BUT, the current ...
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Moment calculation for DC serial generator question

DC serial generator tag information : 9.25kW, 185V, 1500rpm . this is the table I have two solutions, which one might be right
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Switch type for electrical generator bonded to floating neutral

I have an electrical power generator and for it to properly work with it connected to the house it must be converted from bonded neutral to floating neutral according to these instructions. I was ...
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Can you get 240 volts and 50 amps from paralleled inverter generators?

I'm here for help solving the problem of suppling a 240v, 45amp kiln off the grid. The catch is, we can't just use a large portable generator. So, -can you put three or more inverter generators in ...
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385 views

Phase Sequencer

I have 3 phase voltages entering into my PIC ADC (3 different channels ) through a voltage down scaling circuit and I have successfully calculated their rms values inside my controller.Know I want to ...
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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?
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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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What makes automotive alternators so inneficient relative to other applications?

Automotive and some marine alternators typically have an efficiency curve with a peak of 60%. Image from http://www.intechopen.com Whereas alternators to other types of applications reach 96% of ...
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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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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 ...
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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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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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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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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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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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6k views

How can I supplement a portable generator during peak load.

I'm contemplating purchasing a 2000W generator, to power some of my tools. One potential issue i that I have a saw that pulls 2500 W at startup and then 1800 w to run. Seems to my that as the ...
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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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96 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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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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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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57 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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118 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, ...
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132 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 ...
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694 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....
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500 views

Do electric motors have the same efficiency when operating as generators?

Its in the title. I'm just curious and it turns out that either this is such a stupid question that no one has bothered to answer it, or i'm just not good at googling today. I guess I'm thinking ...
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16k views

DC Motor as a Generator Voltage and Current

Is there any way to calculate the expected voltage and current, assuming I am turning it at the specified RPM value, when using a DC motor as a generator without physically testing it? In my case I ...
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80 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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155 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
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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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239 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 ...
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680 views

Calculating for Load Resistance given a T network in between the source and the load

Problem: Calculate the value of load resistance (Rl) for which maximum transfer occurs. Attempt: What I know is that for the maximum transfer to occur, the load resistance must be equal to the source ...
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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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540 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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Electrical Load increase on Generator = More Fuel Consumption

Why does more electrical current drawn from generator leads to more fuel consumption? I understand that it's due to conservation of energy, I just want to know what the phenomenon or reaction is ...
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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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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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