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 Carbon fiber electric assist midracer
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estoudz
Starting Member

USA
9 Posts

Posted - 07/26/2018 :  23:38:25  Show Profile  Reply with Quote
My build in progress of a carbon fiber electric assist midracer.







eric stoudemire

warren
human power expert

USA
6392 Posts

Posted - 07/27/2018 :  08:11:25  Show Profile  Visit warren's Homepage  Reply with Quote
Wow, cool! Is that a motor with a 90 degree bevel gear hanging out the back there? Batteries in that large bottom tube?
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estoudz
Starting Member

USA
9 Posts

Posted - 07/27/2018 :  12:05:58  Show Profile  Reply with Quote
Yes, the 3000 watt motor drives a mitrpak right angle helical gearbox. The gearbox drives a six to one reduction using 219 go cart sprockets. The front wheel uses a shimano alfine eight speed hub. The controller and 72v 20amp/hr. LiPO battery pack are housed in the bottom tube. I might have to use liquid cooling for the motor and the controller and the batteries. Top speed should be close to 50mph!!!

eric stoudemire

Edited by - estoudz on 07/27/2018 12:39:59
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estoudz
Starting Member

USA
9 Posts

Posted - 07/27/2018 :  12:40:05  Show Profile  Reply with Quote
Yes, the 3000 watt motor drives a mitrpak right angle helical gearbox. The controller and 72v 2020amp/hr. LiPO battery pack are housed in the bottom tube. I might have to use liquid cooling for the motor and the batteries.

eric stoudemire
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estoudz
Starting Member

USA
9 Posts

Posted - 09/15/2018 :  21:09:08  Show Profile  Reply with Quote
I have started building my battery pack. It consist of 32 SPIM08HP cells arranged in a 16S2P array. These cells are rated at 8A/HR. and 200A peak discharge current! I had to reduce my battery voltage down to 60v due to space limitations in my bottom tube. The battery will be protected by a 60v 45A BMS. I have also built a range extender alternator from a one HP four stroke weed eater engine and a 510 watt (170vdc at 3A) permanent magnet alternator(repurposed brushless dc motor). The alternator powers a 66vdc power supply that recharges my battery pack. The power supply can also run on 115vac wall current.

https://image.ibb.co/jTV8xK/IMG_0948.jpg
https://image.ibb.co/gdsABe/IMG_0947.jpg



eric stoudemire
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estoudz
Starting Member

USA
9 Posts

Posted - 09/15/2018 :  21:15:53  Show Profile  Reply with Quote
I have started building my battery pack. It consist of 32 SPIM08HP cells arranged in a 16S2P array. These cells are rated at 8A/HR. and 200A peak discharge current! I had to reduce my battery voltage down to 60v due to space limitations in my bottom tube. The battery will be protected by a 60v 45A BMS. I have also built a range extender alternator from a one HP four stroke weed eater engine and a 510 watt (170vdc at 3A) permanent magnet alternator(repurposed brushless dc motor). The alternator powers a 66vdc power supply that recharges my battery pack. The power supply can also run on 115vac wall current.

https://image.ibb.co/jTV8xK/IMG_0948.jpg
https://image.ibb.co/gdsABe/IMG_0947.jpg



eric stoudemire
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estoudz
Starting Member

USA
9 Posts

Posted - 09/20/2018 :  14:40:07  Show Profile  Reply with Quote
I received my linear servo today for my home made electronic shifter for my shimano alfine hub. The servo will be driven by a servo controller that receives information from a microcontroller. I just have to figure how to connect the servo to the bell crank housing of the alfine hub. My 400 watt power supply came today and despite the 40% conversion losses from mechanical energy to electrical energy my genset comes in at only 14 pounds.


https://image.ibb.co/hv19XK/IMG_0976.jpg

https://image.ibb.co/eBaQ6e/IMG_0978.jpg

eric stoudemire
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estoudz
Starting Member

USA
9 Posts

Posted - 02/11/2019 :  16:50:30  Show Profile  Reply with Quote
I have finished wiring my 60V 50A sinewave brushless dc motor controller to my BMS and my 100A current shunt for my power/watt hr meter. I chose a sinewave controller due to the reduced harmonic currents induced in the motor which reduces motor heat and noise thus increasing motor efficency.


https://i.ibb.co/cFLWj8g/0211191702.jpg


eric stoudemire
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