I have the KEA128BLDCRD demo board. No problems getting it up and running with the included motor.
I am trying to drive a custom sensor-less BLDC motor - 3 phase, 10 magnetic poles. I cannot get it to start reliably. Regardless of how I set the various parameters in the Freemaster app, the best I have been able to do is to get it to start one time in 5 or so. If I push-start the motor, it runs fine, but I can't get it through the open-loop start-up process. More often than not, it runs in the opposite direction slowly until a stall error is generated.
(The motor runs fine on a Turnigy PLUSH-80A controller.)
How do I determine the various parameters to get it to start reliably? I have been through the "Sensorless BLDC Control on Kinetis KV" app note (AN5263), the only one I could find with any details on how to tune the system, but the only instructions I find there are in the flow chart:
"Motor starts and smoothly switches to closed loop: False
- Tune Integ thr corr constant
- click update"
I need a little more help than that...