Making an economic electric bike

Cars, buses, bicycles, electric airplanes: all electric transportation that exist. Conversion, engines and electric drives for transport ...
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Flytox
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by Flytox » 09/03/10, 21:56

Will this be an interpolation of Cugnot's machine? (to see at the National Conservatory of Trades in Paris)


http://philippe.boursin.perso.sfr.fr/cugnot.htm

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It’s cute, but I guess it’s as badass or worse than a Solex. : Mrgreen:
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by Leo Maximus » 10/03/10, 09:38

Flytox wrote:Will this be an interpolation of Cugnot's machine? (to see at the National Conservatory of Trades in Paris)

It is possible, but the Cugnot dumper had a military vocation, that does not seem to be the case with the Dampf-Fahrrad steam bike, a priori, it is a peaceful machine.

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: Lol:
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Pierre-Yves
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principle of electric assistance




by Pierre-Yves » 11/03/10, 10:54

sorry, but I don't have the courage to go through the 70 pages of this section to see if the subject has not already been dealt with ...

I would like to know how the principle of electric assistance is implemented: the cyclist indicates (by a potentiometer, I suppose) the maximum effort he wants to provide and the complement is provided by the engine to keep the same speed and the same effort.

thank you !!
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by Former Oceano » 11/03/10, 14:26

It depends on the models.
Some bikes have an assistance setting on the control box (like 25% 50% or 100%).
Others, like mine, have a torque sensor in the bottom bracket that adjusts the assistance according to the force that is applied to the pedals. It is practical because on the flat when you press too hard you have little assistance but as soon as it goes up and you press the bike helps a lot.
When starting at red light, you just have to stay on a fairly large gear and give a good pedal stroke to have a stronger push from the 240W of my bike.
For the models adaptable on classic bikes, there is a disc which is placed on the level of the pedals which activates the assistance when the pedals turn.
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by zorglub » 19/03/10, 18:15

I did not read all the answers, but I will think of a friction drive like the solex and a small motor of 150 to 300w
maybe it is already offered? ....
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by Squall-n » 16/09/10, 21:43

Hello !


I did theory but not much practice = / (bac S SI) If I understood the choice of motor is important, the minimum would be:

24V - 48V
250W and more
14A and above
2000 rpm

Is that right ?

Another thing, I do not plan to mount all this on a bike but rather on a chassis like twike / bugE (of course not to go at the same speed as them), but just to hit the 25- 30km / h, so putting 2 motors 24V, 250W, 14A would be really effective? (the fact of having two changes what? torque, speed? and the weight in all that?)


Thank you for your answers,

The new one -> Squall-n
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by ggdorm » 10/09/13, 17:43

(the fact of having two changes what? torque, speed? and the weight in all that?)


Personally, I think that putting two 250 watt motors rather than a 500 watt motor is not interesting. You will simply double the efficiency losses of the electric motor and the transmission ...
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by Did67 » 10/09/13, 18:25

None of the motors you mention are made to run for a long time. Especially not the starter, which is not cooled.

In 12 V, I have no idea which comes to me from a contraption which can turn pedant say 30 mn or 45 in a regular way every day, in all weathers .... If it is not indeed an electric bike designed for!

A wiper motor runs for hours, but it is not powerful enough. Similarly the fans that bring air (although ??? to check).

I don't know how the electric power steering works. Again, there must be something to bone and dig (it starts with the Twingo - the old one, the "frog").
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by delnoram » 10/09/13, 18:45

Relaunch of a 3 year old subject? : Wink:
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by Cuicui » 11/09/13, 10:00

As an engine, there would be, to connect by chain to the pedal?
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