Making an economic electric bike

Cars, buses, bicycles, electric airplanes: all electric transportation that exist. Conversion, engines and electric drives for transport ...
James
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by James » 10/09/14, 18:04

ggdorm wrote:
(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 ...


Totally agree with your thinking. I do not see the interest
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Re: Making an economical electric bike




by Christophe » 11/03/16, 16:28

2 photos of the homemade electric bike by Pollux:

velo-electric-amateur-pic48.jpg
bike-elec-pic49.jpg
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Re: Making an economical electric bike




by oli 80 » 03/02/20, 18:55

Good evening, here are some videos of the realization of an electric chopper
the videos are not mine, I found them on the net of our friend Ary's concept






if you go on his youtube channel you will find a homemade electric scooter
a hover pocket trike, and a fully homemade dirt bike do not hesitate to go watch his videos
It's worth the detour

good night
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Re: Making an economical electric bike




by Christophe » 17/07/20, 21:29

Another version using an LG Washing Machine motor:

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Re: Making an economical electric bike




by Christophe » 17/07/20, 23:10

Technical details :

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plasmanu
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Re: Making an economical electric bike




by plasmanu » 02/10/23, 08:54

Bonjour.
I can't read all 70 pages so I'll try to clarify it.
The best way to make an electric bike is obviously to take a functional bike and an electrification kit.
An electrification kit is a motor, a controller and a battery.
For my aluminum Gravel (mountain bike style with racing tire) I spent €70 on the good coin for the bike and the Yose Power kit without the battery.
I bought a set of 40 HS scooters for €2, one of which had its battery.
Result of the races 110€ for a bike that weighs 14kgs.

Otherwise for my “Mad Max” always Leboncoin.
A nice mountain bike for €80 and an electrification kit for €550.
The kit included:
A 1500W rear wheel motor
A 500W rear wheel motor
A 500W front wheel motor
Two controllers
A battery
Accessories, display, accelerators, pedal sensors, brake sensors.
And a few hours of racking my brains to install all that.
Performances on point.
And since I got 2 carbon frames I'm preparing one with little onions
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Re: Making an economical electric bike




by izentrop » 02/10/23, 09:12

You no longer need to pedal, but can you go far with the battery?
Power is important but the most important thing is the torque to the wheel when going uphill, rarely indicated for wheel motors. ?

I hadn't seen the images, it seems to be a brushless motor. I read that without a battery it brakes, which is not the case with the classic wheel motor?
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Re: Making an economical electric bike




by plasmanu » 02/10/23, 09:28

Apart from the Gravel which is three-phase planetary, wheel motors above 250W are almost always three-phase direct connection: which means that they operate as a generator.
This is supposed to provide 25% more battery life.
It's true that the couple is to be preferred.
As for consumption/autonomy, it's not complicated: the more you consume, the less autonomy you have and it's exponential.
The goal is to go as quickly as possible while consuming as little as possible.
This implies the bike's ability to technically be able to ride fast, in addition to the weight of the whole thing. You have to weigh as little as possible.
Arriving at 40km/h there is air resistance which comes into play which means that we are less efficient in terms of consumption
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Re: Making an economical electric bike




by plasmanu » 02/10/23, 09:37

Some manufacturers provide summary information.
In my case, if you're not in the saddle when you start, it's a wheelie every time if you use the wrong amount.

For the question of braking without the battery: it depends on the motors or rather on the ability of the controller to manage the 3 phases.
If the current does not flow, the winding does not supply anything and the motor turns like a freewheel.
If there is greater or lesser resistance, it brakes more or less. It is the controller who manages it.
I can drive very well at 40km/h without assistance on the flat, for example, but it's hard enough to cause cardiac arrest. On the other hand, when going downhill, I can combine pedaling and degenerative braking, which is a very interesting advantage for extending autonomy.
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Re: Making an economical electric bike




by Christophe » 02/10/23, 09:50

plasmanu wrote:Apart from the Gravel which is three-phase planetary, wheel motors above 250W are almost always three-phase direct connection: which means that they operate as a generator.
This is supposed to provide 25% more battery life.


The regenerative engine braking doesn't work well on mine (almost zero under 30 km/h), does it work well for you?

It is non-existent on the increasingly common pedal motor systems.

So I don't believe in the 25% at all...

I have 3 VAE: 1 wheel motor (also 1500W : Mrgreen: ) and 2 with motorized pedals (750W and 250W).

Motorized cranksets are more expensive, more annoying to install, but more pleasant to use (the chain and sprockets wear out more quickly, however...) but probably a little more fragile too...7

Nice setup otherwise, on the other hand the 1500W on the front wheel I wouldn't have dared!! : Shock: : Shock: : Shock:

Will you make us a video of the skating? : roll: : roll: : roll:
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