Hi all. I'm in the planning stage of an E-bike. The plan is to race flat track on it, which to me is ideal for electric. My typical race day will include < 30 minutes riding total, with about 10 minutes spent on the throttle across all races. So range is not so much of a concern, so I should be able to pull a large current out of the pack as it's never running long enough to generate a lot of heat.
Initial plan is something like 72V and circa 450A peak draw. Perhaps a 20S22P 18650 pack with 20A cells, dependent on motor / controller selection. Torque when I get on full throttle is more important than top speed on the short tracks I'll be on.
I may have access to a very reasonably priced ME1507 and Sevcon Gen4 size 6 (although at the price I could pay I would likely sell the Sevcon to fund a controller without expensive software). And on paper this seems like a good option, but this forum seems to suggest the Motoenergys underperform to specs. What I have also seen is a decent amount of praise for how hard QS motors can be pushed. The QS 138 seems like it could be run with the same voltage / current, but can it reliably be pushed to 30kW +? The much smaller package size than the ME1507 would be a big advantage when using a standard MX frame.
Then there is the 273, in this application added wheel mass may give an advantage in traction, so running a hub motor is not necessarily a bad thing, and it seems like I could get more performance out of the 273 than the 138, so this could be an even better option?
Have any here experience with all for a comparison? Would I have to run much higher voltage on the QS motors to reach the same output due to current limitations?
Initial plan is something like 72V and circa 450A peak draw. Perhaps a 20S22P 18650 pack with 20A cells, dependent on motor / controller selection. Torque when I get on full throttle is more important than top speed on the short tracks I'll be on.
I may have access to a very reasonably priced ME1507 and Sevcon Gen4 size 6 (although at the price I could pay I would likely sell the Sevcon to fund a controller without expensive software). And on paper this seems like a good option, but this forum seems to suggest the Motoenergys underperform to specs. What I have also seen is a decent amount of praise for how hard QS motors can be pushed. The QS 138 seems like it could be run with the same voltage / current, but can it reliably be pushed to 30kW +? The much smaller package size than the ME1507 would be a big advantage when using a standard MX frame.
Then there is the 273, in this application added wheel mass may give an advantage in traction, so running a hub motor is not necessarily a bad thing, and it seems like I could get more performance out of the 273 than the 138, so this could be an even better option?
Have any here experience with all for a comparison? Would I have to run much higher voltage on the QS motors to reach the same output due to current limitations?