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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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1answer
91 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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47 views

Relating input torque on BLDC motor shaft with output current

I am trying to build a drone generator with a gasoline engine and a 14-pole,170KV, 2KW BLDC skateboard motor (this one). Before designing the system and running it, I wanted to clear out a fundamental ...
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2answers
108 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. ...
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56 views

Running a DC motor through a bicycle and charging a battery [closed]

I am running a DC motor through a bicycle and charging a battery. Does battery gets charged while pedaling in both the directions? I observed from voltmeter one is negative voltage. I am novice in ...
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2answers
108 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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578 views

Homemade dynamo and alternator

I'm a curious person that knows only basic physics, and I want to craft a homemade power generator (eolic, magnetic or hydroelectric, the origin of the energy doesn't matter yet). I would like to ...
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2answers
1k views

How does a wind farm prevent the fastest spinning turbine from driving the slowest one?

Just what the title says. On a wind farm spread across several score hectares, I assume, the wind-speed wouldn't be uniform. The faster spinning turbines would probably induce more electricity than ...
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3answers
1k views

Harvesting energy from a small amount of wind

I am currently investigating the feasibility of a project that would include the need of harvesting some energy from wind. The size constant of the generator and fans is about 2"x2"x2". The end goal ...
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45 views

How to create a mechanical vibration?

I need to create a system which will make vibrate horizontally a plastic tube of diameter 4cm, of height 3cm, which axis is vertical, and whose weight is 11g. The frequency should be modifiable ...
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1answer
152 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 ...
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1answer
143 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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1answer
51 views

Simulation of the Micro-kinetic generator

I am simulating the block diagram of the Autoquartz system during unwinding in Simulink. I want to get the current of microgenerator (Ibus), but I get an oscillating pattern, which you can see here ....
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35 views

Advice on thermoelectric generators

Hey everyone I was curious if you could help me. There maybe several questions in this so bear with me. Btw I am not an engineer so try and keep it simple please. What variables are needed to find how ...
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11 views

Shock from mobile generator [migrated]

I was given a mobile generator but it gives an electric shock from the casing when running. Why? How can I check with an MM? How can I stop it happening without the need for an earth spike.
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31 views

Estimation of Synchronous Generator Mechanical Damping

We know that the no load acceleration torque of a synchronous generator is given by the equation (Ta = Tm -Te - Td) where Td = Dw and D being the damping due to rotor losses. Is there a way of ...
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24 views

Role of independent and dependent sources when calculating equivalent resistance

There are plenty of topics about this question, but I did not find a precise answer. Let's consider two points A and B of a generic circuit and suppose you want to find the equivalent resistance ...
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2answers
19k 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 ...
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2answers
1k 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 ...
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3answers
4k views

What happens to unused power in generators

I have a 7KVA generator which i use for multi-purpose. Some times i run AC on it and some times not. Will the generator consume less fuel when i utilize less power generated from it? Thanks
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1answer
22 views

Efficiency Test of Permanent Magnet (PM) Motor With Variac&Fixed Resistance

We have a 3-phase permanent magnet motor and want to test its efficiency in generator mode. We can give a mechanical input power with an external motor (torque meter and tachometer installed) and we ...
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1answer
447 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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1answer
48 views

Power limiter for 1 kW hydro turbine

I have a question about designing a solar-hydro energy system, as we ran into a problem in the implementation phase. We have 1 kW pv plant connected directly to a charge controller, and the 1 kW hydro ...
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2answers
179 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 ...
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1answer
159 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 ...
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2answers
64 views

Pump power factor OK on mains, but low on generator

I'm working on a submerged pump application, running on 415V three-phase. I don't know for sure, but I believe the pumps are only a few KW. The customer is saying that the pumps run fine when the ...
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2answers
73 views

Induced EMF in electrical machines

I am currently working with machines and when I try to understand their principles in-depth, specifically in machines, I got to know that EMF is induced because of any of the two reasons: 1) Time-...
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1answer
39 views

How brush shifting affects current distribution in dc machines?

I understand that how armature reaction causes neutral plane to shift by some angle . If brushes are placed along Geometrical Neutral Axis, then there'd be sparking during commutation as voltage ...
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4answers
2k views

Is a PWM required for regenerative braking on a DC Motor?

The DC Motor is question is here: DC Motor I was wondering if you use a diode and a switch in a manner shown in the below picture if the motor would exhibit regenerative braking when SW1 is open? (...
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1answer
35 views

Selecting an alternator/generator

I am designing anenergy regeneration system using a pulley attached to the wire rope of a track elevator using a 3:1 sprocket ratio I am getting around 670 RPM`s I am using two 6 volt lead acid ...
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25 views

Impact of Interconnection of One Energy Generating Plant At Another Generator Plant's Generator Bus Bar(PV Bus Bar)

As the scheme attached below, we're interconnecting 5.5 MW of generated power of upstream project(Around 2 km Away from the Interconnecting Switchyard) to the Generator Bus Bar(PV Bus Bar) on 11 kV ...
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5answers
1k views

Laptop failure due to constant fluctuation of AC frequency and voltage [closed]

I spend most of time on a boat (not on holiday :/ ) where a huge generator provides electricity. The potential problem is that the output is very dependent of the "mood" of the engine. Sometimes the ...
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4answers
8k views

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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4answers
60 views

What is the source of reactive power generated by the alternator?

We know an alternator or in general any source of energy does not generate energy but converts one type of energy into some other usable form. An electric generator produces both real and reactive ...
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2answers
118 views

Square wave generator won't work

I'm trying to generate a square wave at 21kHz (+13V,0V) using this schematic: I used formulas and this website to find the correct values for my components but it doesn't seem to work on Simetrix. ...
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37 views

Wind Turbine Generator Types [closed]

I am curious about wind turbine generator types used around the world today if anybody has any experience they wish to share. My question is mainly are most wind turbines of the synchronous or ...
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2answers
104 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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1answer
596 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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1answer
24 views

How can you work out the internal resistance of a rectified 3 phase generator?

If there is a star topology 3 phase generator such as this- Connected to a full-wave diode rectifier such as this- Can you approximate the circuit to this-? (assuming steady state, DC load) If so, ...
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1answer
115 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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8answers
6k views

What's a good square wave generator?

What's a good circuit to use to generate a square wave? The exact waveform isn't too important - I just want to get a piezo buzzer cranking at 150 kHz. I also want efficiency and adjustable amplitude. ...
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1answer
106 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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3answers
153 views

Generator using a 2-stroke nitro engine

I'm designing a generator using a nitro engine and a motor. My design is similar to the YouTube video that I linked below. My main concern is to generate 12 V of electricity. DIY 220v Dynamo ...
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1answer
57 views

Unbalanced voltage on 3-phase wind turbine system

I work on wind turbines, I am a troubleshooter. I have a problem on the turbine which I cannot solve so far I would like to ask the help of this community. When turbine starts to generate, an ...
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51 views

Type of DC motors for generators [duplicate]

I'm looking for a motor to produce 11V. I'm a little confused about which type of motor should I use. The shaft of the motor is connected to the nitro engine and it will rotate the shaft of the motor. ...
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64 views

Charge mobile phone using wind turbine

Using this tutorial as a guide, I have put together simple DIY wind turbine capable of giving around 2.5V - 3V output across the motor when spinning the fan blades. I can also light up some LEDs when ...
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1answer
673 views

Voltage drop in a Permanent Magnet Generator

A small alternator type 4-pole permanent magnet generator(PMG) outputs AC sinusoidal voltage from 1V to 30V where output voltage amplitude increase with frequency. I first set the generator to ...
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1answer
9k views

trying to increase current output of a generator

this is my first time posting here also I'm very new to electrical engineering. i am building a pull cord (like a lawn mower) human powered generator and I'm looking for ways to increase the current ...
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2answers
72 views

Can I combine water turbine without power loss? [closed]

I have this small 12V water turbine generator. I connected one of these in a pipe running from a container on my roof to the ground. (height ~6m) and reached ~9V. If I buy 6 and put them one after ...
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1answer
4k views

DC generator without permanent magnets

I have heard that there are DC generators where resistance can be regulated by using electro-magnetic field. Where permanent magnets are substituted with electro-magnets. Are this kind of generator ...
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6answers
35k 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?