Hey guys, I haven’t been active on this form before, but thought I’d make a post and share a build that was completed several months ago. It is my first build and I’m quite happy with it for now.
max around 50km/h goes about 20km but haven’t bench-marked precisely.
The design goal is an optimal bang for buck dual hubs setup. The total cost ended up around $1200 dollars, but can easily go below $800 if I chose a less fancy deck and ESC.
The VESC6’s were a bit pricey but definitely runs smooth without problems, I was a beta tester and mostly expertise in electronics so this is something I’m willing to splurge on. If I build another, I would consider using another ESC another my friend is working on that can drive 2 motors for $100: https://odriverobotics.com/#features
The battery configuration is designed to be as cheap as it gets, 4x3s RC lipo packs in series. Cost $120 total. There is no BMS, the VESC already takes care of over current and low voltage protection. To charge it, I bought four low current 3s chargers for $6 each https://tinyurl.com/ybr7yej4. They are low current enough to charge through the balance ports without needing to unplug each battery to charge, and the balancing is a plus.
Not so worried about bending the batteries in this arrangement since a carbon fiber deck has zero flex.
The design was made to fit this battery -> https://hobbyking.com/en_us/turnigy-battery-nano-tech-4000mah-3s-25-50c-lipo-pack-xt-60.html?___store=en_us but recently hobbyking stopped shipping batteries to japan, so I had to find a chinese equivalent in the same form factor. From a past project, I found these nano-techs to be very slim for a 3s (20mm) and did not puff up much with age.
The chassis is custom made, designed for 3D printing, the filament used costs around $20 excluding trial iterations during design. If anyone else wants to use it here’s the link : https://cad.onshape.com/documents/02d850ea504003ff8ec3647a/w/247ca65aba941cf1eb0a8ab4/e/7696919bd0aa67d72aa20b4e One notable thing is that the battery compartment is designed to “slide out” which provides the mechanism to access the balancing ports to charge as well as swapping the battery packs on the go.
I was a bit worried about the quality of the chinese hubs knowing there will not be any manufacturer support. but TBH I’ve had no problems with them so far. The 800W max per motor is a bit lower than I’d liked, but I guess that is the trade-off for the full enclosure causing worse heat dissipation. They haven’t been over heating on me since I find myself rarely needing to max throttle. I chose them mainly because they were cheap and has a low 60KV ideal for a 12s build.