Hello! To resolve the issue, I would ensure you have run the Motor ID procedure in Kutcher to identify the important parameters specific to the motor you use (including flux linkage, and a few more). I followed the instructions exactly using the first video available on the Myxa Quick Start Guide provided by Zubax: Post with Video Tutorial on Motor ID
In following this video, you have taught your Myxa how to best control your motor. Let me know if this helps or if the issues are with some other aspect.