Questions tagged [dynamo]

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2 answers
67 views

AC to DC 6 V for bicycle and super capacitors for lights

I’m trying to design a circuit to enable my bicycle lights and also have at least 2 minutes of standing lights coming from a bicycle 6 V AC hub. I thought about building a rectifier bridge with 4 ...
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2 votes
3 answers
166 views

Building a solid state regulator for a vintage 6 V dynamo

There was a great discussion back a few months ago on building a regulator for a dynamo. I have a similar challenge except the vintage motorcycle I'm restoring is a racing machine - neither lights not ...
0 votes
1 answer
44 views

Different fan size in same duct [closed]

Im trying to build pc cabinet such that there is 3 fan input to cabinet, and just one output which is the smps inbuilt fan. Then seal off all other air gaps. Q. Will the smps fan break due to ...
  • 5
1 vote
1 answer
125 views

what force is required to rotate a dynamo or alternator

I am working on an initiative for a new product. The product generates a rotational output force from: Input force of 14.73 NM Input speed 120 rpm Gear ratios from 0.5 - 2 The out rotation is ...
  • 11
4 votes
2 answers
530 views

Building a solid state generator/dynamo voltage regulator, to replace an old mechanical regulator

I like to restore vintage motorcycles, which commonly use 6V electrics. The vintage bikes use a 6V dynamo or generator to produce DC which is then regulated to a constant 6V. The current method in a ...
0 votes
2 answers
272 views

Regulating the output of a vintage motorcycle dynamo

I am restoring a late 1940s Velocette Mac 350 motorbike. I have a few working dynamos for this bike, but the original regulators are hard to find in working condition. I bought a regulator on ...
0 votes
4 answers
211 views

Dynamo connected to ceiling fan to charge a battery

Just a hypothetical scenario : I am thinking of connecting a dynamo to the ceiling fan to charge up a battery which might be later used to power some low power gadgets. Whether this would save my ...
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1 vote
2 answers
255 views

Alternator without permanent magnets and without external power source

From the answers to the following question (1), I gather that it is theoretically possible to operate an alternator / dynamo / generator: Without permanent magnets. With an external energy source ...
0 votes
2 answers
330 views

Can a 48v electric bike battery be charged from a 4v or 5v Son 28 hub dynamo?

I want to ride an electric bicycle over long distances, including hills. I only want the motor for steep ascents. I am trying to stay off-grid as much as I can. So I would like to recharge the bike'...
0 votes
2 answers
61 views

A current generated from electric generator turbine/motor forced externally to rotate in one direction [closed]

How can an AC current generated from electric generator turbine/motor forced externally to rotate in one rotary direction be alternating, as it's just the reversed DC motor process generating force or ...
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4 votes
10 answers
8k views

Can an inverter through a battery charger charge its own batteries?

I understand some of these laws of thermodynamics. An alternative to this question, being inventive, is 'Can an inverter power a dynamo (which is powered by an electric motor) to charge the same ...
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0 votes
2 answers
400 views

Dynamo powered by motorcycle to charge a battery [closed]

Hello and apologies if someone has asked this, I didn't see a question quite along these lines. If you have an electric motorcycle, is it possible to have a dynamo attached to the bike that will ...
2 votes
3 answers
326 views

AC overvoltage protection for bike dynamo (alternator)

I built my own MOSFET active rectifier and DC/DC stepdown for a bike dynamo hub and wanted to use it for charging a mobile phone. The circuit is working, but there is one thing which needs to be ...
  • 121
1 vote
4 answers
673 views

In a Shimano dynamo hub with 6V regulator is the rest of the power being wasted?

I bought a Shimano hub dynamo that gives a maximum of 6 V with a regulator that they have provided. From what others here have said, the regulator is a Zener diode. The output voltage of the dynamo ...
0 votes
1 answer
49 views

Problem with new bicycle front led light and old bulb back light

I had a problem with my front bulb light at my bicycle. So, I bought a new one (LED) for the front, but somehow, the back bulb does not work anymore. I have checked the wires for loose connection, so ...
0 votes
2 answers
292 views

Homemade dynamo

I have been planning on a homemade wind turbine, but I could not find any low rpm brushless dc motor and it's quite expensive. So I wonder if I could modify a ceiling fan to generate electricity. I ...
0 votes
1 answer
154 views

Create variable mechanical resistance to dynamo spinning

I want to make a system with a dynamo where the dynamo can be made harder to turn (as a fitness device) and I want to be able to use an electrical signal from an arduino or similar to control the ...
1 vote
1 answer
116 views

Is this circuit correct?

I need to know if this circuit is efficient to transfer most of the current from several identical independent 2 phase dynamos. The converters are all the same and ideal for the voltages no problem ...
0 votes
1 answer
66 views

Commutators and direction of current

I just read about commutators and their uses in motors and dynamos. While revising the topic I came across this question: According to me the answer should be (c). Because: In the above diagram of ...
-1 votes
2 answers
74 views

To run 1.5 ton ac [closed]

i want to run a 1.5 ton ac through dynamo and generater(that run a dynamo) for that purpose how much KVA dynamo required and also a diesel generator(how many hp/KVA) will be required. NOTE:- generator ...
2 votes
2 answers
2k views

Dynamo - Reversing the rotation of the shaft

I'm having a debate with a friend. He claims that if you change the rotation of the shaft of a dynamo the output DC current changes direction. I, however, claim otherwise. The way I see it is that a ...
  • 437
0 votes
1 answer
69 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 ...
0 votes
1 answer
127 views

How does this dynamo work?

I disassembled a dynamo-fuelled torch and I found this set-up. Now, what I know is that the led should be lighted up by the electromagnetic force generated by the time-varying flux within the coil. ...
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