Demonstrator for electricity production with a bike!

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senorchang
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Re: Demonstrator for electricity production with a bicycle!




by senorchang » 24/08/16, 09:30

Hello,

I allow myself to relaunch this thread two years old, I am looking to perform exactly the same educational editing: a bike driving an alternator to generate 220v, without batteries to show the link between pedaling and powering devices.

so I attached a mini scooter wheel to an electric quad motor (36v 500w). The bicycle placed on a stand drives the alternator by friction between the bicycle wheel and the scooter wheel.

So I arrive at a variable power from 0 to 36 volts direct current depending on the pedaling speed.

To this I added a variable voltage regulator, fixed at 24vdc.

=> problem, I intended to connect this assembly to a 24dc -> 220v ac inverter without battery except that this one does not want to start ...

So I can not go from 24vdc regulated to 220v ac without going through batteries :(...

If you have an idea do not hesitate!

merci!
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chatelot16
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Re: Demonstrator for electricity production with a bicycle!




by chatelot16 » 24/08/16, 10:02

a 24V 220V converter requires sufficient available power to start and power what you plug into the 220 ... the slightest shortage cuts it off completely without battery

for an educational purpose without battery it is impossible to use a normal converter

it is enough to use 220 device that can operate at variable voltage: use a conventional generator generator with wound excitation, and by removing the regulator, replaced by a simple rheostat and do the regulation by hand

piloting the regulation by hand shows another problem: when the voltage is too low, if we increase the excitation we increase the effort required of the pedaler and we make it slow down, which does not increase the power .... regulation with a low power source is a headache ... this is why no automatic solution without battery is available

a 2000W generator alternator with too much empty power loss to be useful on a bicycle: solution, use it at 110V: its nominal power becomes 4 times lower, 500W which is perfect for a bicycle and its lost power when empty becomes very low and its performance becomes excellent its adjustment of excitation becomes very instructive
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Re: Demonstrator for electricity production with a bicycle!




by dirk pitt » 24/08/16, 10:21

.
already when I read this, I'm afraid:
Senorchang wrote:So I come to a power variable of 0 to 36 volts direct current according to the pedaling speed.


you must stay in DC voltage and not try to transform it into 230VAC
for example plug a small cordless drill directly on your generator (without its batteries) and try to drill a hole simply in wood. it's very educational!
or as mentioned above: a resistance in a cup of tea and you pedal until the water is hot: very educational too!
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senorchang
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Re: Demonstrator for electricity production with a bicycle!




by senorchang » 24/08/16, 14:03

Thank you for your answers ! Exact, little confusion in the morning between power and voltage ...!
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Re: Demonstrator for electricity production with a bicycle!




by Did67 » 25/08/16, 10:48

This is where we see that we develop fairly weak powers. Or conversely, that our usual devices consume crazy energy if it had to be produced by the strength of the muscles. Fortunately there is oil, gas and even nuclear!

We laugh at the cyclists of the Tour de France: even doped, they top 400 W. Not even an electric coffee grinder!

So yes, it will be very educational. On condition of explaining and not sticking to "it doesn't work well!"
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Re: Demonstrator for electricity production with a bicycle!




by Ahmed » 25/08/16, 12:16

You rightly underline it, Did:
Or conversely, that our usual devices consume crazy energy if it had to be produced by the strength of the muscles.

What is interesting is to compare the current devices with the old hand systems: in the case of the coffee grinder that you mentioned, we realize that the technical solution adopted is quite different from the first models, because the question of energy consumption is only an adjustment variable, the main thing being that the device adapts to the characteristics of a universal electric motor (good weight / power ratio, inexpensive, low energy efficiency, speed high rotation) ...
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Re: Demonstrator for electricity production with a bicycle!




by chatelot16 » 25/08/16, 13:33

coffee grinder ?

we come back to the crushing of the bones, by the energy side!

the old technique of the coffee grinder was a kind of screw, with a vertical axis, which crushes the grain rather in strength than in speed ... it works well with a low power ... we are not exhausted in turning the crank

the more modern solution is a 200w electric motor and a small propeller ... if there is not enough power to turn fast enough it does not work ... it is less good for the quality of coffee, that overheating, it's too thin useless leaving too big

the only advantage of the electric coffee grinder is that it is more economical to build than the old hard steel screw mill

it's the same problem for hammer mills: modern high speed systems are cheaper to buy than force systems, like blake crusher that existed in quarries a long time ago and which we no longer see never today with us ... that we still see on tv by the roadside in india or china, or we break the calloux where it is needed
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Re: Demonstrator for electricity production with a bicycle!




by peter » 03/11/23, 12:21

Gentlemen!
You whose wives ride exercise bikes...UNNECESSARY!
(for FEAR of gaining a few Grams...by eating cakes...)
Add a dynamo to the bike...to charge batteries.
: Twisted:
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Re: Demonstrator for electricity production with a bicycle!




by Macro » 03/11/23, 13:17

Peterr wrote:
Add a dynamo to the bike...to charge batteries.
: Twisted:


And unload the fat from their ass
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Re: Demonstrator for electricity production with a bicycle!




by phil59 » 04/11/23, 18:49

Peterr wrote:Gentlemen!
You whose your women ride an exercise bike...UNNECESSARY!
(for FEAR of gaining a few Grams...by eating cakes...)
Add a dynamo to the bike...to charge batteries.
: Twisted:


Well, I only have one... : Lol:
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