Could somebody please recommend a small-ish hub/DD motor that still has okay torque/heat characteristics?
I’m working on a roller-drive e-bike and want to replace the motor (currently a Turnigy SK8 6354 140KV) with something that doesn’t overheat so fast.
I managed to buy a spare Raptor 2.1 motor, but now think it’s a little bit too big/heavy to easily mount on my frame (I know, I know - there’s no substitute for copper/iron).
I’d really appreciate if someone can chime in if they know a decent motor with roughly these specs:
Can diameter 60-70mm, width under 80mm,
ideally around 900g (the Raptor motor is 1.5kg!),
Ideally something I can buy a single motor of (instead of a whole kit).
I know good torque and heat characteristics are generally in line with stator size, but also that there are other factors such as stator/magnet/winding design and materials.
Who makes good quality smaller motors?
I’m thinking maybe e-lofty, or trying to find one of the older Hummie motors. There are also some unsealed Maytech 6374 motors that look workable. Happy to buy used if anyone has something spare.
More info on build for reference/interest:
The motor sits under the cranks and drives the tyre. It’s working well so far. This setup is only intended to be an assist to pedalling, and as such I have limited the power to 300w.
I know heat management is a problem for slow moving hub motors, but I expected a better result due to the low 300w power level. Though the system works well at speed, when crawling up long hills at ~10km/h the amps get up and we hit the 80°C cut-off within a few minutes. .
I want to be able to climb looong hills on a hot day at 10km/h (ideally less) with 300w of assist. I Already plan to upgrade to 10s battery, which will allow me to run a lower kv motor and still keep top speed around 40km/h.
Flipsky VESC 4.12 in aluminium heat sink case. Set to 300w/45A max.
Turnigy SK8 6354 140kv motor
Zippy 7s lipo battery
Thanks in advance for any help guys,