Questions tagged [dynamo]
The dynamo tag has no usage guidance.
31 questions
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Can a simple DC motor detect physical resistance or manual movement?
I'm currently fixing the tray mechanism of a CD player. I have replaced the broken cogwheel and the drive belt, but one problem persists: sometimes when I press the "open" button, the tray ...
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Charging 18650 Li-ion battery with dynamo
I want to charging 18650 with dynamo. The dynamo will not work regularly, you can think of it as being turned by hand, that is, it will not be able to produce a constant energy. I think this will be a ...
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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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Powering a pico with a lipo battery charged by a bike dynamo
I am building a GPS tracker build on Raspberry Pi Pico and a u-blox 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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2k
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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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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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632
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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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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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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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292
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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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142
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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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2
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2k
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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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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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