Help on making an electric moped

[I Citro]

Wow ! You mix everything.
A transformer works to transform alternating current, not direct current.

For questions of power, which you do not seem to master, You must integrate Ohm's law before anything else.

The rheostat of BX is in fact in series with all the bulbs which illuminate the dashboard. To have often replaced them, it is about ten miniature bulbs "wedge" (without base) of 1.2W or about 10 to 15W. This is 100 times less than the power you want to manage.

current electric scooters are with rare exceptions in 36V minimum, for the most part in 48V and more and more often in 60V.
The equivalent 125cc models are theirs with operating voltages greater than or equal to 3V.

Last point: CONTINUOUS electrical current is very dangerous, much more than 230V AC and this from 48V.
When you electrocute in direct current, you don't feel anything, the body fluids are electrolyzed, or you even catch fire spontaneously ...
A minimum of theoretical knowledge is essential.

[soulinscraps]

at the base, actually, I was looking for a system to create a minimum of energy while driving. but in fact, I want to drive the vehicle with the electric motor and recharge the batteries with alternators connected to a small heat engine.

my reasoning having further evolved, I have the idea of ​​actually making a hybrid vehicle, taking a mob and leaving its original thermal engine there, or even improving it to consume less while leaving it connected to the transmission to the rear wheel.
on the luggage rack, put the electric motor or motors which join the common transmission which also goes through an alternator.
I explain myself, during long journeys, I leave with the electric motors, when the battery weakens, I cut the electric motors and start the thermal engine to continue the journey while recharging the batteries thanks to the alternator and when it done, I just cut the engine to resume with the electric motor ...

in your opinion, is it possible? for the mechanical part in any case it is but for the electrical, I don't know ...

ps for citro: it is the only thing that I retained from my electricity lessons, the dangers of electricity, the nice photos that we show you at the beginning of the year, etc. but as I mix everything and I have little knowledge, it is actually quite difficult.

[dirk pitt]

.... I explain myself, during long journeys, I leave with the electric motors, when the battery weakens, I cut the electric motors and start the thermal engine to continue the journey while recharging the batteries thanks to the alternator and when it's done, I can cut the heat engine to resume with the electric motor ...

in your opinion, is it possible? .

it is not the right question.
the good question: what is the goal?

[I Citro]

Yes, if the goal is to make it complicated, you have won.

I too have limited knowledge, I never know enough ...

I discreetly oriented you on the bike base because it is the simplest, the lightest and the one whose result will be the most convincing. You will have a functional and truly efficient hybrid.
Starting simple lets see that ... Nothing is ever simple.

There is on this forum engineers and experts in electrical mechanics, and those who go into practice simplify as their project progresses for several reasons:
save time, save money, make the project functional ...
Quite often, overly complex projects are abandoned along the way ...

[soulinscraps]

well, the goal is to be able to drive for a long time and stop only to refuel after 5/600 km or even more.
this principle seems to me however very simple, if we take the right moped, it is enough to lengthen the transmission chain to drive or be driven by the electric motor (s) and the alternator ... (apart from the fixings to weld of course )

when the electric motor is running, the clutch of the heat engine is not actuated, no need for modification, and conversely when the heat engine is running, the electric motors run in a vacuum ...

the new question: would it be useful?

I am not looking for something efficient, to drive fast I have a car and a 600cc, I want to have the same satisfaction as when I manage to drive a car that has not driven for 20 years, which was doomed for scrapping, I want to build something with my hands, which works, even badly at the start, it does not matter, but in any case, if I am here, it is because I am not sufficiently propped on the subject to get there alone

in any case, be sure that what you tell me does not fall on deaf ears and that I try as much as possible to do based on your reviews but for example, buy a ready-made bike, or a conversion kit, it is not financially possible.

[Aumicron]

Your idea and your motivation are nice.

By cons as you present things, it seems to me that you will rather lose in overall performance (increasing friction, electric motors running in a vacuum, additional weight ...) and therefore make less km with the same full.

I could be wrong, but it would be better to use the engine only to drive the alternator when the battery needs it and not the wheel.

So you could spin it to the level of its best performance (to be determined).

The wheel would always be driven by the electric motor and you could also recharge the battery on the sector.

Good thinking and good luck

[soulinscraps]

yes, you're right, you should know that an alternator, produces about 14.3 volts from 1500 rpm, beyond this engine speed, the production remains substantially the same, so this is the choice of engine is important , because I don't know if an alternator will produce enough to recharge the battery as it is drained by the engine.

for the moment we are going to forget the vehicle itself, to which I would later scratch the engine, to see more clearly, I will first realize the engine on a fixed test bench, if that seems to work then I could start to adapt it.

admitting that I can take a 24v motor with 2 x 12v batteries so what could I take as an engine ?, truck fan motors as Cuicui said?


for Citro:
in fact I believe that my starting goal is very simple, I want to recreate the functioning of the starter of my car in the same circumstances but in another environment, with the same resources, and for only big difference, a progressive switch and a greater constraint

[I Citro]

well, the goal is to be able to drive for a long time and stop only to refuel after 5/600 km or even more.

Are you saying that you intend to be able to drive 500 to 600 km per day with this machine (more than 11 hours of driving).


When I am asked about the autonomy of my electric cars or my scoot'elec, I invariably answer: "sufficient" ...

Imagine the waste of having to transport 10 times more energy than what you will consume daily.


Wanting to design an "economical" vehicle is the opposite of that.
I urge you to read Michel Kieffer on the subjects: the car of the future ou the motorcycle of the future.

[Aumicron]

soulinscraps

you should know that an alternator, produces about 14.3 volts from 1500 rpm

Voltage is one thing, but you have to worry about power first.

Mopeds of my time revolved around 2 horses. Maybe half would be enough for you.

So you have to find an engine that develops this power and an alternator of the same barrel to the nearest yield.

For your engine it must also be able to run for a long time without deteriorating.

[Alain G]

Hello soulinscraps!

It seems that your project is theoretically viable, but in practice very difficult to achieve.

The only choice I can see would be to use two 2 volt brush DC motors mounted on the same chain, to couple in parallel in motor and in series in alternator possible with some relay, now you must have a factory variator to avoid maximum resistance loss.

Without wanting to offend you, I believe that your engine control skills are not very high to accomplish this project, well I can be wrong.

Good luck!