A friend of mine builds cargo trikes. He uses a special motor that's attached/integrated to the differential. It has an output speed of 200 rpm and 10:1 reduction ratio, so 2000 rpm motor speed.He doesn't know how many poles or magnets. He tried the 12 FET KT Sinewave controller (S12S from BMSB), but can't get it to run properly at any P1 setting. He also tried the L setting that multiplies P1 by two; however, it runs fairly well with the 12 FET Square wave version (S12P), when run sensorless, though the starting from standstill is a bit rough. I heard from Xionda that KT sine wave controllers don't work at high commutation speeds, which is why you have to buy their special controller (Lishui) with their tiny motor.
The question is whether there is a nice controller that can run with the hall sensors at a commutation speed that high. It needs to run continuously at 20 amps, so a max current of at least 30 amps. I think 15 or 18 FETs would be better because he has to use the software in the 30 amp S12P to limit the current to 20A to stop it from overheating.
The question is whether there is a nice controller that can run with the hall sensors at a commutation speed that high. It needs to run continuously at 20 amps, so a max current of at least 30 amps. I think 15 or 18 FETs would be better because he has to use the software in the 30 amp S12P to limit the current to 20A to stop it from overheating.