allways thought that hub motors need all the stator diameter you can get, and the biggest ive seen (in the medium/lightweight? category) is the magic pie, ive had 134nm of torque from one of these so thought it would have some potential for power when properly fed.
between 200w and 1000w these motors work sweet from the factory with the inbuilt controller but only to 60v max, so we've set up a couple of these to run on external controllers, the guys at golden motor dont appear to be fans of this handiwork and say its not what what the motor is intended for, wtf?
anyway, this stator was from an 18inch cast wheel that ive spoked up into an alloy "14"inch moto rim and put on the back of a downhill bike.
using one of kewins 18fet controllers at about 40amps todays ride was on about 110volts and pulled a max of around 4320w from the pack, downhill i got 88kph max and on a flat it wandered between 77 and 82kph and the motor is outputting a bit over 3.5kw.
it was not a bad effort from the pie, as the winding temp stayed below 100deg c (they will take 150 without damage) and i reckon a slicker bike would have maby done another 10kph on the same power as this bike is not really for road use, with off road downhill front tyre and a 14" 4 ply motorbike knobby on the back its set up for dirt not road, but the geometry and suspension travel was kinda helpfull..
im pondering another 25volt pack for a touch more speed, but this is here in oz where its 200w max so obviously this was not done on the road, in a 50 zone :wink:
ill try get some photos/vids/dyno runs up shortly.
between 200w and 1000w these motors work sweet from the factory with the inbuilt controller but only to 60v max, so we've set up a couple of these to run on external controllers, the guys at golden motor dont appear to be fans of this handiwork and say its not what what the motor is intended for, wtf?
anyway, this stator was from an 18inch cast wheel that ive spoked up into an alloy "14"inch moto rim and put on the back of a downhill bike.
using one of kewins 18fet controllers at about 40amps todays ride was on about 110volts and pulled a max of around 4320w from the pack, downhill i got 88kph max and on a flat it wandered between 77 and 82kph and the motor is outputting a bit over 3.5kw.
it was not a bad effort from the pie, as the winding temp stayed below 100deg c (they will take 150 without damage) and i reckon a slicker bike would have maby done another 10kph on the same power as this bike is not really for road use, with off road downhill front tyre and a 14" 4 ply motorbike knobby on the back its set up for dirt not road, but the geometry and suspension travel was kinda helpfull..
im pondering another 25volt pack for a touch more speed, but this is here in oz where its 200w max so obviously this was not done on the road, in a 50 zone :wink:
ill try get some photos/vids/dyno runs up shortly.