GrayK's RC Mid-Drive (Deathbike)

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GrayK   10 µW

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Joined: Jan 04 2018 1:14pm

GrayK's RC Mid-Drive (Deathbike)

Post by GrayK » Apr 29 2019 11:52pm

I have been using CAD so much more recently and decided it was time to make a crazier bike than my old Denzel motor. When I had the fund I started to work on an extremely compact solution. I am using 3 VESC all in a CAN array powering 200kv 6384 sensored motors. Pictures do most of the talking. I was extremely lucky and had a friend of mine waterjet the plates for me. I can hit 40mph on 1st gear and its so much power I worry that I will break the controllers. Still building confidence on it. If there is a big enough demand for these motor assemblies I might start selling them. They are super compact and still can output 100Nm of torque at the drive sprocket. The hardest part now is finding batteries that will be happy to push out 240+ amps so, for now, its 12s Lipo. I also can't get FOC to work on VESC because of a "Flux leakage"
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thorlancaster328   1 W

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Re: GrayK's RC Mid-Drive (Deathbike)

Post by thorlancaster328 » Apr 30 2019 12:07am

That's quite the build!
Have you considered putting a chain guard over the mid-drive chainsaw mechanism?
Find weakest component, upgrade it, repeat until satisfied. Rome was not built in a day.
When in doubt, get bigger MOSFETs / Batteries / Motors / Etc.

GrayK   10 µW

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Joined: Jan 04 2018 1:14pm

Re: GrayK's RC Mid-Drive (Deathbike)

Post by GrayK » Apr 30 2019 12:42am

Hahaha thats so funny yeah kinda have been busy recently with school but for now i'm wearing shorts and tucking in laces

fio   1 µW

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Re: GrayK's RC Mid-Drive (Deathbike)

Post by fio » Apr 30 2019 12:46am

:warn: :warn: :flame: :flame:

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icherouveim   1 kW

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Re: GrayK's RC Mid-Drive (Deathbike)

Post by icherouveim » Apr 30 2019 1:11am

Great project!
Do you have some videos to share with us?
I can see some LG 18650 cells, is this your backup power to get you home when you run out of lipo power??

GrayK   10 µW

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Re: GrayK's RC Mid-Drive (Deathbike)

Post by GrayK » Apr 30 2019 10:34am

icherouveim wrote:
Apr 30 2019 1:11am
They arent 18650s they are large Caps I think you are talking about the VESC noise protection but im not sure. I will post videos soon

billvon   100 MW

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Re: GrayK's RC Mid-Drive (Deathbike)

Post by billvon » Apr 30 2019 11:50am

GrayK wrote:
Apr 29 2019 11:52pm
I can hit 40mph on 1st gear and its so much power I worry that I will break the controllers.
I'd worry more about breaking the chain/cluster. That's a lot of torque for a bike chain designed for ~250 watts.
--bill von

GrayK   10 µW

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Joined: Jan 04 2018 1:14pm

Re: GrayK's RC Mid-Drive (Deathbike)

Post by GrayK » Jun 06 2019 3:11am

billvon wrote:
Apr 30 2019 11:50am
GrayK wrote:
Apr 29 2019 11:52pm
I can hit 40mph on 1st gear and its so much power I worry that I will break the controllers.
I'd worry more about breaking the chain/cluster. That's a lot of torque for a bike chain designed for ~250 watts.
I put a torque curve on the motor controller for that reason. It ramps up the power from 10% to 100% in a given time independent from the position of the throttle.

billvon   100 MW

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Location: san diego

Re: GrayK's RC Mid-Drive (Deathbike)

Post by billvon » Jun 06 2019 2:30pm

GrayK wrote:
Jun 06 2019 3:11am
I put a torque curve on the motor controller for that reason. It ramps up the power from 10% to 100% in a given time independent from the position of the throttle.
That doesn't sound like it limits the torque, just reduces the ramp rate.
--bill von

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