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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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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42 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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545 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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97 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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272 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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1k 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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57 views

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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36 views

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
104 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 ...
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199 views

Can VFD be used with induction motor for regeneration?

I want to use VFD with induction motor to run it as induction generator (driven by external prime mover). Does VFD circuit allow reverse flow of electrical power? Thanks
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65 views

Specifications of this Signal Generator [closed]

Can anyone please tell me which is the maximum voltage and current that can be provided by the signal generator HP 83650B ? I need that information and don't know where to find it
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108 views

Dc motor as torque transducer for BLDC motor

I bought a cheap BLDC motor on some Chinese website and could not find its characteristics. However, I have A28-400 24V amp flow Dc motor with its characteristics. If I'm able to build a test rig to ...
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297 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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52 views

Can a DFIG operate in a synchronous speed?

A DFIG can operate in both sub and super synchronous modes. Can a DFIG also operate (stable) in a synchronous speed? If so, would the rotor current (as decided by IGBT switching) be DC since the rotor ...
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80 views

Reactive Power in grid side converter for Doubly fed induction generator

Does the grid side converter in a DFIG absorb/provide reactive power or is it reactive neutral? Also, what can we say about reactive power exchange in the rotor side converter?
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55 views

How to optimze a coil for needed voltage?

Faraday's law for a coil is : V = A * M * N Where: V = Peak output-voltage A = Area of the cross-section of the wire M = Rate of change of magnetic flux in the coil N = Number of turns of the ...
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190 views

What are the d and q axes for induction machine?

What are the d and q axes for an induction machine (physical meaning)? I understand them for a synchronous machine but how are they defined for an IM?
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2answers
69 views

Limiting the speed of an induction generator

A turbine (whose angular speed must not exceed \$\omega_{max}\$) is driving a 3-phase induction generator. I envisage the generator's electrical output being monitored by a circuit that reacts to ...
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119 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 ...
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134 views

What is the purpose of perpendicular “smaller” magnets in between the main magnets in a rotor of a motor? had never seen this before. Do they help?

I am trying to build my own generator at home for fun, I saw on a video in youtube https://www.youtube.com/watch?v=YsSm65DAcCg where the guy placed smaller magnets in between the main magnets of the ...
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61 views

“3 phase” Type of winding I am not aware of, help? not wye or delta, maybe eFed up generator?

I bought a few 30 watt 3 phase motor/generators in supposedly delta configuration from a ali express. the motor did have only 3 wires coming out, plus the manual stating it, I am pretty sure this was ...
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1k views

How does a generator not stop itself?

I'm having trouble reconciling my understanding of motors and generators. Let's examine a simple DC motor at rest. Applying a voltage (\$V_{applied}\$) to the terminals generates a large current and ...
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180 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 ...
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1answer
41 views

Should a off-grid wind charge controller be UL certified? [closed]

I recently bought a 2kW wind generator, 48V Charge controller and a UL certified off grid wind inverter for my Home based wind project prototype. My charge controller which I am using to rectify the ...
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355 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 ...
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4answers
118 views

Is it possible to switch an electrical machine several times from motor to generator and vice-versa, within one revolution of its rotor?

I would like to find out how quickly and frequently a reversible electrical machine (EM) can be made to switch functions from a motor to generator and vice-versa - and what are the parameters of the ...
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311 views

What is the main difference between AC and DC generator basic working principles? [closed]

I cannot understand the main difference on AC- DC generator basic working principles. Lets consider how a loop wire works with a magnetic flux inside a DC generator briefly. Whenever the sides of the ...
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106 views

In a Generator, why when the Exciter voltage increases the Generator Voltage decreases?

I have a project where I have to build an electrical model of a generator with constant torque at 1500 RPM and simulate it in LabView. I have a manual that describes some measurements that were made ...
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4answers
106 views

Is a motor-generator set a reasonable way to get the purest waveform electricity?

It looks like audiophiles go as far as installing separate powerlines to power their high quality audio systems. The motivation is that the amplifier and other hardware would run cleaner when the ...
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2answers
113 views

Having difficulties running AC compressors from a generator on a boat

I have a problem that has me stuck and it’s marine related. When my ship is on shore power the AC system works perfect with no defects the evaporator and compressors comes on. When I switch over to ...
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127 views

Could the extra power not used through a regulator or buck converter be used in another load without taking away power from the regulator? [closed]

I’m making a design for a crank generator which will charge my phone and a battery at the same time. The generator will be connected to a bridge rectifier, then a buck (step down) converter, which ...
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1answer
140 views

Why build very similar diesel-electric engines in both AC and DC traction versions?

I'm reading Wikipedia on GE Evolution Series diesel-electric engines. The series includes ES44AC and ES44DC models. Looks like they are very similar but one uses AC traction and another uses DC ...
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3k views

Diesel generator consumption formula

I am working on a project to monitor a power meter parameters like voltage, frequency, current and so on and this monitoring for both AC and DC. For DC we are using Cummins diesel generator, now I ...
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67 views

Controlling electrical flow from generator

I'm working with a factory which has a backup generator which is used during grid instabilities or whenever the factory must disconnect from the grid for maintenance. In these cases, the generator is ...
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1answer
424 views

What frequency do BLDC motors generate?

When BLDC motor is used as generator, how does the amount of poles effect the frequency of the 3 phase AC that it generates? For example, if I had a motor with 8 poles and I spun it at 50 rpm, what ...
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3k views

Using a BLDC motor for regenerative braking

I am planning on using a BLDC motor to drive a small go-kart like vehicle. I would like to implement regenerative braking, but am having trouble finding certain details. My main concern is being able ...
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2answers
93 views

Synchronous burst generator circuit

Ok, this is my very first question here so please forgive me if I'm asking a too broad question or if my problem description is too imprecise. I have a 13.56 MHz (RFID) pierce-type quartz oscillator ...
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78 views

How to perform conducted emissions testing for electric generator?

I am doing pre-compliance EMC testing on an electric generator. The standard I am reading explains how to test devices that get power from mains, but it doesn't explain the testing procedure for a ...
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76 views

What stabilizes the alternators/generators?

I've completed my intern in hydroelectric power plants. I've seen large generators working to maintain voltage in 50Hz. They were turning at 187,5 rpm with 32 poles. But I wondered what stabilizes ...
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51 views

Boost converter - high current [closed]

Hi I have a generator with a 3 phase brushless motor acting as a generator rectified and smoothed to produce 0-12 volts however theoretically 2hp is approximately 1.5kw and at 12 volts before losses ...
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589 views

How the Kv rating relates to power generation with BLDC motors

I am confused about how the Kv rating of a bldc motor affects the 3 phase ac it generates because, the Kv rating is based on the dc voltages that are applied to the motor by its esc. So for example, ...
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54 views

Permanent magnet generator tooth width

I am thinking about designing a radial flux permanent magnet generator. However, I could not find any information about determining the tooth width. Should the tooth width be all the way the same as ...
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157 views

Producing energy from lighting bolts

An average bolt of negative lightning carries a current of 30 to 50 kiloamperes, transfers a charge of 5 coulombs, and dissipates 500 megajoules of energy (120 kg TNT equivalent, or enough to light a ...
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Understanding generator wear and rotor electrical measurements

I have a generator that I am attempting to fix, and I am getting readings that are out of spec on the rotor brushes. Per some instructional videos I found, I should be measuring 5V AC on the rotor ...
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158 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 +...
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153 views

Build a simple coil generator

I know that if I want to create a powerful electromagnet, then I'd better put a ferromagnetic material inside the coil I build. So I was wondering if the same applies in the inverse scenario, that is ...
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233 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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140 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.
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58 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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1answer
68 views

Harvesting energy from a truck

I'm trying to create this prototype where I will require constant charging power for a sensor i will install on a trailer (container truck trailer). However, due to some problem, I wasn't able to tap ...

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