Took a Tony kart without motor and installed batterys and electric motor.
Motor: GM 10kw 48V and 100kv I think.
Battery: 16x 60Ah Winston
Controller: GM VEC500 48V
Motor speed with wheels of ground was 4700rpm. Rear wheel size is 11"
and theoretically top speed should be 81km/h.
First day in the track had a 15 teeth motor spocket and 45 teeth rear spoket, this made a 3 times reduction of motor speed and 3x increase of torque.
Max speed on the track was 73km/h, so motor rpm was 4300. Current was limited to 200A on controller. As the speed was not enough spockets were replaced
Next try was with 18 teeth motor spocket and 36 teeth rear spocket, this made a 2 times reduction, and with 4300rpm max speed should be 112km/h.
But actually max speed was 93km/h so motor speed was only 3600rpm. Result of this test was that motor controller overheated after 12km of racing (12 laps).
Max current was increased from 200A to 250A also, but it overheated even with 200A. Motor was only slightly warm.
Video on that day: [youtube]https://youtu.be/ypJ3Iw4WwiQ
Installed a big heatsink beneath controller with active cooling to keep the controller heat down, but have not had time to test it.
Heatsink size compared to controller: and here installed with coolers:
Also increased rear spocket size to 40 teeth, so right now I have 2,2x reduction and should get the same 93km/h with 4000rpm but have more power for accelerating.
Are waiting for analogger to be delivered so I could see my motor and controller temperature compared to current.
It seems that 48V is not enough
Was thinking of adding 4 more elements to increase voltage to 60V. I know that controller can handle it, as it is universal from 48V to 110V.
But how can 100kv motor handle 60V, it makes the maximum rpm to 6000 without load? With load and 4700rmp is good enough to me.