Questions tagged [dynamo]
The dynamo tag has no usage guidance.
29
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Dynamo current limiting circuit with LM317
I'm trying to lower current to about 20 mA, but even attaching a resistor of 50 Ω, I'm still not getting the regulated 20 mA or so current with the LM317.
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1
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Powering a pico with a lipo battery charged by a bike dynamo
So, I am building a gps tracker build on raspberry pico and a neo 6m gps module. Now, I want to power this project with a lithium battery that can offer some autonomy. I was thinking of using a ...
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Raspberry Pi Pico powered by a bike dynamo
I am building a GPS tracker for my bike using a Raspberry Pi Pico and a NEO-6M GPS module.
I need this GPS to be up and running at least 14 hours a day.
The only problem is the power source. Ideally ...
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Step up dynamo voltage with transformer
I'm using a 100 turn coil and some magnets to create a 100 mV AC signal from my bike wheel. I need to boost that voltage up to at least 400 mV to use a DC-DC boost converter to get 5 V. For that ...
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Charging an 18650 Li-Ion cell via a bicycle hub dynamo
I'm interested in building a buffer battery for a 12V GPS tracker using a single 18650 Li-Ion cell. It will be mounted on a bicycle and unfortunately I haven't found a design for a tracker including ...
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Bike power supply system
My idea is to build a electronic system for my bike to supply my phone and lights with energy. I want to use a Dynamo (6 V, 3 W) to charge a USB Powerbank. From its two USB ports I want to charge my ...
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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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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 ...
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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 ...
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674
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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 ...
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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 ...
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495
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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 ...
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4
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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 ...
user220456
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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 ...
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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'...
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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 ...
user282923
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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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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 ...
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3
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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 ...
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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 ...
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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 ...
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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 ...
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251
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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 ...
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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 ...
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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 ...
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2
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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 ...
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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 ...
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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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141
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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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