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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Field winding polarity in DC generator

My question is in relation to a four pole, two brush, shunt generator. (Specifically, a simple DC generator used in BMW motorcycles of the 50s and 60s.) The brushes are at 90 degrees, and the positive ...
-1 votes
0 answers
53 views

Why did activating the smoke machine blow the LED light running from generator? [closed]

The cable of an LED light flamed out when I pressed the smoke machine button while doing sound at a wedding. Sound and low-power lights were running off a voltage-controlled Honda EU70 silent ...
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Calculating generator over-speed following sudden disconnection and delayed valve closure

I'm working on an exam question related to power systems and need help calculating the over-speed of a generator following a sudden disconnection from the grid. The question is: A 475 MVA, 2 pole, ...
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Is it possible to have a 5000 watt diode? I need to stop the possibility of a back current supply from a hybrid inverter & solar PV to generator [closed]

Is it possible to have a 5000 watt diode? I need to stop the possibility of a back current supply from a hybrid inverter & solar PV to a running generator
0 votes
1 answer
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Where does the electricity in electromagnets come from if permanent magnets from generators decrease their magnetic strength?

The question has been puzzling me for some time, I presume electrical power starts from generators, the heat produced by them(generators) cause their magnets to weaken and electromagnets have to be ...
0 votes
2 answers
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How does a hydroturbine induction generator control its own frequency/water flow if it is already excited/pre-determined by the grid?

I was reading this article How do you connect hydro to the grid? and the author states there are two methods. One by a fixed-speed induction generator and another by a grid-tied inverter. I understand ...
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Why does the valve symbol have a Clase symbol,or short-circyit symbol before the earth [duplicate]

Could anyone explain to me why the valve symbol have a shortcircuit symbol or termination symbol before the earth???
7 votes
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235 views

Clock generator output off by a factor of sqrt(2)?

I'm using the Si5351A-B-GM clock generator with the NX5032GA-25.000M-LN-CD-1 (25 MHz, 8pF) crystal. The fragment of the schematic is shown below (the rest of the schematic omitted for clarity): ...
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1 answer
1k 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 power factor 0.8 lagging. The synchronous impedance of each ...
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1 answer
300 views

What is faster than a relay?

I need to find something that is faster than a relay. What I'm trying to build is an electrosurgical generator for acollege project. I want to accomplish something like this: This was the reference I ...
1 vote
2 answers
239 views

Single-phase diesel generator to three-phase modification

I have a 220 V, single-phase diesel generator and I would like to know if it's possible to modify it to generate 400 V, three-phase. I have never tried this before.
1 vote
1 answer
129 views

Building a frequency inverter chimera

Industrial frequency inverters (or "variable speed drives") can be thought in three parts: A mains rectifier, that converts two- or three phase input current to DC, a DC energy storage (large ...
-1 votes
2 answers
679 views

Alternator's saturation in load and no-load conditions

When a ferromagnetic material is exposed to a magnetic field in which it moves, some voltage is induced in the material. If you increase the magnetic field, the voltage is increased up to a point, and ...
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3 answers
64 views

Using a 6 V DC motor for a 3.3 V LED

We are tasked to do a generator with LED for our project. We were given this video as a guide. I am planning to buy a 6 V DC motor to power a 3.3 V LED. Is that okay? Although I have read somewhere ...
0 votes
3 answers
284 views

Single-phase vs three-phase generator

I am in India. We have 3 phase power coming in from the grid. They don't do single phase for anything over 3 kVA. 4 wires from the pole to a fuse box. 415V, 3 wires each going to a separate fuse and ...
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1 answer
407 views

How to determine induction generator poles?

I designed an induction generator in the Maxwell program for a wind turbine, and it worked. I selected 4 poles for stator and rotor and 12 slots for both. Is the number of poles enough for 1500 RPM ...
5 votes
5 answers
715 views

Hand-powered generator

I'm interested in a hand powered generator similar to the one in this Gakken Helicopter Kit. Are these easy to come by? Easy to make?
1 vote
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62 views

Permanent magnet alternator: what happens when windings get shorted together for voltage regulation?

Here is a typical scheme for a permanent magnet 3 phase alternator as found on many motorcycles and recreational vehicles, with rectification to DC via a diode bridge and subsequent voltage regulation ...
1 vote
2 answers
14k views

Why are there diodes going to D+ on this alternator/generator?

Above is a schematic of an alternator/generator. I understand the rectification going to B+, but I don't understand why there are 3 diodes going to D+. The way I understand the setup, D+ measures the ...
1 vote
1 answer
392 views

Smart Power Restore Alarm

I have a portable generator I am going to use with an interlock system, which prevents back current to the grid, to power the house during outages. Knowing I would need a power return alarm to notify ...
2 votes
0 answers
41 views

4am Shut down of hydro system that uses motor as a generator

My micro hydro system "motor as generator" stops generating on random days, but always at 4 am. It seems the resonance between the capacitors and generator winding is lost and the generator ...
0 votes
1 answer
233 views

Generator's excitation current - why do we need to know it?

I dont undestand how seperately excited DC generators work. If I remove the DC source doesn't that mean the generator will stop producing power? And what is the excitation current? Won't the generator ...
0 votes
3 answers
235 views

Troubleshooting a homemade Van de Graaff generator

So, I'm trying to build a Van de Graaff generator from household items, but after a lot of tries, I'm still unable to get it working and was hoping someone here could help. The problem is that no ...
2 votes
1 answer
69 views

Three-phase motor as generator: intermittent loss of field

I have a 7.5 hp, 3-phase motor I am using as a generator on a grid-tied micro hydro system. The system works well most of the time and generates roughly 4400 W or about 100 kWh a day. The connection ...
5 votes
2 answers
855 views

Does speeding up a diesel generator result in a better load response?

If I speed up my prime mover (500 kW CAT diesel generator) from 60 to 61 and 62 Hz 1800/1830/1860 rpm and hit it with 25/50/75/100 percent load steps, how much, if any kW/HP is gained? I am simply ...
5 votes
4 answers
2k 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 ...
2 votes
2 answers
118 views

How to extend up-time after power supply is gone

I just started to work on a small home project. I have an indoor bike that I use quite a lot. The resistance of the bike can be adjusted manually in a purely mechanical way (by tightening a screw). ...
1 vote
1 answer
737 views

What factors affect the voltage drop in a basic AC generator when an additional load is added in parallel

As a preface, I am in school to become an engineer on a ship so my question relates to a self-contained circuit/grid and not a home. We are going over generator theory and how an automatic voltage ...
-1 votes
1 answer
235 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, ...
4 votes
2 answers
114 views

Why is the shunt field of a DC starter-generator disconnected when used as a starter?

The Lycoming T53 turboshaft engine is started using a starter generator. The starter generator is a shunt generator. When the T53 is started, the starter generator is used as a DC motor to get the ...
0 votes
2 answers
134 views

XR2206 Signal Generator breaks up and distorts badly all waveforms

I just put together this signal generator with a xr2206 DIY kit, single supply, tried 9,6V smps first (too low!), then w/ checked speced minimum 12V DC Li-Ion Vcc, same behaviour, distortion/unstable. ...
3 votes
1 answer
215 views

Generator voltage dipping at specific loads with observed increase in frequency

Background I have an interesting problem at hand on a diesel generator onboard a marine platform. The generator is rated at 380V, 50Hz, 3Ph and 1500kW output. Problem While conducting installation ...
3 votes
2 answers
224 views

Ratio of electrical input to mechanical input in a synchronous generator

In a synchronous generator we want to convert mechanical to electrical power but the thing that confuses me is that we also use electrical input as dc current which goes through rotor windings to make ...
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Regulator Circuit 30-300v for 3-phase generator

I need help with the rest of the circuit to control the field in the generator (it is a 400v 3-phase 50Hz generator). I have looked around online and only find car generators 12v and 24v. What I'm ...
0 votes
2 answers
316 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-...
3 votes
1 answer
226 views

Generator frequency control

We are trying to run an AC generator on an RV for a customer. On an RV as you drive the engine RPM goes up and down. As I understand it, that would change the outlut AC frequency. Is there an ...
0 votes
2 answers
96 views

Charging LiPo Battery with Solar Panel and Water Turbine Generator

I'm looking for a way to be able to connect a Solar Panel (5.5 V / 540 mA) and a Water turbine generator (3.3 V / 120 mA) together to charge a LiPo Battery of 4,000 mAh. While using the solar panel ...
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1 answer
1k views

I need to know what the resistance of the stator and rotor windings are

How do I calculate the resistance value of an alternator stator? 2.5 kW 50 Hz 220 V 8.3 A 12 V
2 votes
3 answers
262 views

What happens when you get a fault to earth without an MEN link on a 3 phase generator? [closed]

For context, an isolated type single phase generator (no earth stake or neutral-earth link) had a residual current device connected to it and then a fault between active and earth was placed on the ...
2 votes
3 answers
2k views

This is a question about squirrel-cage induction machine theory

When operating as a motor, the stator rotating field induces voltages (and hence currents) in the rotor windings and makes it spin (hence the rotor produces a torque). When operating as a generator I ...
0 votes
2 answers
92 views

How can I feed the output of a universal motor (as generator) back into its field coils?

I've been playing around with a universal motor to see if I can get it to generate power - with the aim in mind of trying to connect it to a wind turbine in the future. I have had some success at ...
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0 answers
70 views

What motor will work best as a generator for low torque input?

I would like to know what kind of motor will work best as a generator. The input will be RPM with low torque around 20-40 N*mm (this is the minimum.) It should be possible to rotate the motor at this ...
1 vote
1 answer
1k 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. ...
0 votes
3 answers
4k views

Question about hooking up two generators in parallel

I read this question, 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 generator that is 30 amperes but 120 V. Initially, I was going to wire ...
1 vote
5 answers
2k views

Using Electric Motor/Generator Instead of Inverter to Deliver AC Mains from Batteries / Solar

I am exploring/researching Solar PV systems and the possibility of setting up a solar installation company. DC/AC inverters are very expensive and I am trying to find a cheaper solution. Question: ...
3 votes
1 answer
50 views

Wind Turbine Generator [closed]

Can an unstable and low current supply from a 7V wind turbine dc generator motor charge a 24V lithium-ion battery? If yes, how will it be done?
-1 votes
1 answer
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High-reliability transformer selection [closed]

Our company has an emergency diesel generator as backup in case of electrical failure. This generator is powered by batteries to start up the genset. In order to charge those batteries, we need a ...
0 votes
0 answers
25 views

Is it required to have both ATS/ACTS and AMF in electrical system?

I just read an electrical system layout and specification, where the designer put an ACTS on the distribution panel (to switch between the main and generator), and AMF on the generator. What I read ...
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Is the per-unit internal voltage equal to the ratio of field current to no-load field current?

An example problem provides the following information to solve for the field current. The problem is below. A large 60 Hz synchronous generator can be considered to be round rotor, that is, xd = xq = ...
1 vote
1 answer
115 views

Generator control over active and reactive power

My background is in electrical installations. I have been put on a project that is assessing generators. I would like to tap into the experience of those on this forum. I am asking these questions ...

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