spent a few hours yesterday tweaking vesc parameters, but the system is still failing at its most important task- putting power to the ground.
some 4 pages of hastily scrawled notes attest to the debacle... in retrospect, this HI200 is doing exactly the same thing as the previous Flipsky vesc- which i attributed to that unit being slightly underrated for voltage. both vescs are brand new, and i don't suspect any issues with the Tiger Motor U15. if the motor has any problems it's not obvious, but it is one of the last explanations i can think of.
also, no fault codes have been thrown by the vesc despite the numerous cutouts under load on the street. motor runs flawlessly in the shop with wheel jacked up and no load, plus i was able to minimize the sensorless start up hunting to negligible levels by reducing the switching speed to 30khz from 40. i've measured zero resistance on all of my heavy DIY battery cabling.
this loaded motor cutout is a common problem over in the esk8 community, with dire results when that happens- getting pitched forward off your longboard. of course that whole sport was invented by ER docs and orthopedic surgeons... most of those boarders simply had their max total amps set too low. i've set mine at 475A so that's not it, in fact there doesn't seem to be much palpable torque difference when playing with motor amp settings, though if you can never get on the throttle it's hard to tell.
this is pretty damn frustrating. this bike should be a serious lightweight high performance ride, feeding on (75) brand new Molicel p42a 15s5p.
one of the last things i can think of is that the motor detection- done three times including with chain and rear wheel disconnected, all with the same results- is that the vesc is saying 14 poles. the U15 has 36 stator teeth and apparently 42 magnets, 36N42P according to spec sheet (i originally thought i counted 36 magnets but closer inspection reveals that incorrect). so 14 poles seems like a bad # to me, and i don't know whether the vesc means pole pairs, or the number of magnets (update on that- found a prior response by BV himself on vesc-project that says it means number of magnets). could this presumed error simply be causing the vesc to get out of sync with the motor- cutting it out under load????