Originally Posted by
EbikeHawaii
Somethings wrong with that motor too.All the ones I produced draw 40 watts freespinning on 60 volts at 56 RPM per volt which is slightly slower.
No-load 3360 rpm at 60V => No-load 2688 rpm at 48V (5% slower than Planet Ryder)
Originally Posted by
EbikeHawaii
Both motors have all the same parts except the two I had made myself minus the sloply glued on un needed fan.The torque constant on that motor is lower as well because my ex partners decided to use the weaker magnets.And it IS a FORD stator.
A FORD stator is used with self-made magnet rotor.
Originally Posted by
EbikeHawaii
.My two year old motors i never used yet have 14 poles with a different stator and even larger magnets in the same dia rotor. It will be for a 125 frame size dirtbike and weighs 6 pounds.With a sprocket ratio of 7 to 1 it has aprox 125 ft lb of torque of torque at 50 amps 72 volts at 3400 rpm loaded up a bit.
At 72V
No-load rpm = 56X72= 4032 rpm.
"loaded up a bit" rpm = 3400 rpm (at 84% of no-load rpm)
14 poles at 3400 rpm => 397 Hz
Drive wheel rpm = 3400/7 = 485 rpm
125 ft lb => 169 Nm ( very high torgue at drive wheel)
Output Power at drive-wheel = 2X3.14X (485/60) X 169 = 8580 W
Input power = 72X50 = 3600 W
There must be something wrong in the data/calculation because the Output power is 238% of Input power.
Please help!??
Seems that this motor is still in R and D stage. Any further developement/results?
I have great interest to see this motor. Any photos ?