Need Help with Custom eBike Build

[ellery_nistler]

Hello,

I am currently building my own budget eBike using a pulley drive train, and right now it's not working. I'm a beginner, so I could really appreciate some help!

Here are the parts I'm using:

Motor - https://a.co/d/5PQv0mw

Battery - https://a.co/d/dZzhDmS

Speed Controller - https://a.co/d/2lp1p6h - 24V

Throttle - https://a.co/d/bVKP6me

When I connected all of these electrical components and pulled the throttle, the motor sadly wouldn't run. As far as the drive train, I'm planning on 3D printing a motor mount and the motor/wheel pulleys. If somebody who knows what they are doing could help me, that would be awesome. Thanks!

Note: I am using Tom Stanton's video (DIY Electric Bike) for inspiration.

 

[Hoggdoc]

Hello,

I am currently building my own budget eBike using a pulley drive train, and right now it's not working. I'm a beginner, so I could really appreciate some help!

Here are the parts I'm using:

Motor - https://a.co/d/5PQv0mw

Battery - https://a.co/d/dZzhDmS

Speed Controller - https://a.co/d/2lp1p6h - 24V

Throttle - https://a.co/d/bVKP6me

When I connected all of these electrical components and pulled the throttle, the motor sadly wouldn't run. As far as the drive train, I'm planning on 3D printing a motor mount and the motor/wheel pulleys. If somebody who knows what they are doing could help me, that would be awesome. Thanks!

Note: I am using Tom Stanton's video (DIY Electric Bike) for inspiration.

I followed Tom's builds as I remember his 3D printed brackets didn't work out very well. I wish you luck maybe reach out to Tom see what he says about your build.

 

[curtis]

your motor is rated at 2,900W. Almost 3 horsepower.

Your controller 250W. 1/3 HP.

That is your first problem.

I have always wanted to do a pully / belt drive system. I have 5 chain motors. Two brushless and three brush. 750 to 3 kilowatt.

I like where this post is going. I also need help with belt / pulley.

I see you are using an RC motor. Torque per watt is < than standard e bike brushless, brush, chain or hub motors.

That is because they are designed for lightweight flying vehicles or mini cars. Not heavy EVs that roll around.

I would gear that RC motor for around 30 mph or less. My 3,000W brushless 43 mph and my 1,800W brushless - 35 mph.

You need a compatible controller and then the correct motor and wheel pulley to make it work.

Let me know how you make out. Hopefully other members with more experience with belt / pulley can help us.

If I were to go with super lightweight RC motors, I would get one for each wheel and then could gear for 40 mph with two of those. The price and weight for RC motors is much less than standard e bike motors dollar per watt. You can buy two RC motors for < than one standard e bike motor and weight per watt is also less for an RC motor so worth considering but way more complicated to build.

Those are the pros and the cons. The rest is up to you.

Also note a 5 Ah or 5,000 mah LiPo is only good for < 5 miles if you run a LiPo alarm or monitor voltage onboard. You do NOT want to run them below 3.4V as are asking for trouble. If you want decent range, go with at least 15 or 20 Ah. LFP - LIFEPO4 if you can afford it as 100% safe battery chemistry compared to Lion or LiPo. If you have a safe place to charge, Lion and LiPo are cheaper. If not go with the safer batteries.

YouTube has many videos on lithium batteries and safety. I have not seen a lot on RC motors for e bikes. I know car alternators and even washing machine motors have been used with some success. The only type of e bike motor I might not build is friction drive but if I did it would be dual wheel. Two powered wheels is better than one in my book. Why they build all-wheel drive cars.

Here is an idea. Run your RC motor on the front and 4 of those robot motors on the back.

I think those 775 motors come in 24V mode. I know 8 - headway 15 Ah cells are 200 amps and 24V. (battery hookup) That is what I would do. Might get close to 50 mph then. Figuring gearing with such a setup is beyond my skill set though. LOL. Not sure about controllers either. I think the 775 motors are brush and the RC you got brushless. The faster you gear it the less hill climbing ability so take that into consideration.

Thanks.

Curtis out.