Inspired by Dave Wilson's youtube video "teaching old motors new tricks" , i decided to build my own inverter with the hope that the Instaspin can do the magic of FOC. my original understanding was as long as the user feed the 3-phase voltages and current to the ADC channels, motor should spins.. now i found it's not that easy.
my inverter is IGBT based, which i want to handle high voltage and current.: 3 phase voltages measured with divider network and feed into ADCs through isolated amplifier. 2 hall-effect sensors measure at the phase A and Phase C output, then the signal directly feed to ADCs. to make it simple, i mapped these sensor to the same adcs channels used by the drv8301. now the inverter bridge, driver, and sensor circuits all tested to be working. i thought by slightly modify the original software, my inverter should be working..
First, i had a lot of trouble with removing the common mode voltage from my voltage sensing signal, as the code expect no common mode, after many trials, it still doesn't work. so i have to modify the hw..
Next, the current signal, i have two hall effect sensors measured at 2 of the three motor power lines. although the user.h allows to change the number of current sensor to 2. i'm not sure if the software going to automatically figure out which phase has a sensor and calculate the one without? i couldn't find any document about this.
now i'm at a point a real TI technical support would be very helpful, but after opening up support case twice in the past and heard nothing back, i'm kinda of run out of option..
P.S if anyone know how to effectively get a technical support call from ti, please let me know. thanks
