Progress report - assembled the actuator back to the ATC300. Did some system level characterizations with the o-scope and have decided PWM isn’t going to be practical (once the TC actuator starts moving it basically takes it to full lock just slower). Agree with going down the pure DC path and will build a pulse counting program for the controller and monitor current feedback. Biggest question I have is at what current does the TC get to 100% (a straight DC 12V stalling the motor does something interesting, but don’t want to drive it this way!).
Going to shift gears on the project to disassembling the E36 and E46 donor car. Will check back in a few months on here when I build the controller.
AWD E36 Project xti: xDrive reverse engineering Pt 3 | System level testing with an Oscilloscope! 4K