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oldfarrrrt
i am trying to make an electric bike for my granddaughter. can anyone give me some suggestions on how to accomplish this? what size motor would i use? can the battery be recharged while in use? any info would be appreciated.
Answer
To answer your question, 24 to 36V would be more realistic. 12V will be a very slow e-bike (maybe that's what you want?)
That said, this is a classic make-vs-buy proposition. Let me hazard a guess that you want this by Christmas, and it needs to work, right?
I suggest buy.
The reason is, motors for e-bikes are much more robust than those you might find in a hand tool, kid's ride-on toy or a starter. A typical e-bike motor will be 500W or more sustained duty, and so will have the extra mass and cooling to handle it. A tool or starter motor just isn't built for that kind of duty and will fail in short order.
Plus, the kit will come with a speed control - and if done right the controller will do regenerative charging too.
Lucky for you, there's lots of e-bike kits, both the in-hub style and chain drive. Looks like they run about $400, with the bulk of the cost being the motor and battery.
First link below is to a site that sells both parts and complete kits. (Lots more if you google "electric bike kit" - second link is just an example).
BONUS: sub-8 second electric drag bike (last link.) Just because.
To answer your question, 24 to 36V would be more realistic. 12V will be a very slow e-bike (maybe that's what you want?)
That said, this is a classic make-vs-buy proposition. Let me hazard a guess that you want this by Christmas, and it needs to work, right?
I suggest buy.
The reason is, motors for e-bikes are much more robust than those you might find in a hand tool, kid's ride-on toy or a starter. A typical e-bike motor will be 500W or more sustained duty, and so will have the extra mass and cooling to handle it. A tool or starter motor just isn't built for that kind of duty and will fail in short order.
Plus, the kit will come with a speed control - and if done right the controller will do regenerative charging too.
Lucky for you, there's lots of e-bike kits, both the in-hub style and chain drive. Looks like they run about $400, with the bulk of the cost being the motor and battery.
First link below is to a site that sells both parts and complete kits. (Lots more if you google "electric bike kit" - second link is just an example).
BONUS: sub-8 second electric drag bike (last link.) Just because.
How do you put a chain driven motor on a bike with suspension?
Dug
I was thinking about putting a motor on an electric motocross bike so it goes faster, the only problem is is that the motorbike has suspension in the back and I was wondering if a chain driven motor can be mounted so when I hit a bump with the suspension the chain won't pop off or become stressed.
Answer
Get your rpm ratios (drive to driven) figured out first. This may be a non-starter. You would be better off using a belt drive with a slip clutch pulley mounted on the drive shaft. Then ratios are not a big issue because the belt slips enough to give you variable and workable ratios as you vary the clutch tension.. A cobbled up chain drive can be bad news. Too much stress and it breaks. That could tear your leg open. As for the suspension, the idea would be to have new things follow the exact path and position as the old.things. If that is not possible, then you will need someone who can cut, reposition and weld. By the time that is done, you may wish you had just sold the bike and bought a bike with a gas engine. Back in the day, we did this with bicycles. Our rear wheel pulley was a second rim welded on the rear tire rim.
Get your rpm ratios (drive to driven) figured out first. This may be a non-starter. You would be better off using a belt drive with a slip clutch pulley mounted on the drive shaft. Then ratios are not a big issue because the belt slips enough to give you variable and workable ratios as you vary the clutch tension.. A cobbled up chain drive can be bad news. Too much stress and it breaks. That could tear your leg open. As for the suspension, the idea would be to have new things follow the exact path and position as the old.things. If that is not possible, then you will need someone who can cut, reposition and weld. By the time that is done, you may wish you had just sold the bike and bought a bike with a gas engine. Back in the day, we did this with bicycles. Our rear wheel pulley was a second rim welded on the rear tire rim.
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Title Post: is it poss to run a bicycle or small motorcycle on 12 volts dc?
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Rating: 83% based on 9498 ratings. 4 user reviews.
Author: Unknown
Thanks For Coming T0 My Blog
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