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Question asked by joevn on Aug 24, 2013
Latest reply on Aug 29, 2013 by Gigi

I am trying to get sensorless FOC working on a 14 pole surface mounted outrunner motor. It has a Rs of 0.35 Ohm and Ls of 1.0 mH.

I installed Motor Library v3.0 and applied the IFN003V1 patch. I set all of the board settings listed in UM1478. I then compiled the library and user application code and loaded with ST-LINK. The board connects fine and the settings match the workbench.

When I try to start the motor with overcurrent sensing enabled, it always returns an overcurrent error immediately. When I disable overcurrent the sensorless revup works, but at the end of the revup I instantly get a "startup failure".

Any suggestions on what to try? It seems that something in the current feedback is erroneous.