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TMS320F28379D: Questiones about speed loop in Dual-Axis Motor Control Using FCL and SFRA On a Single C2000 MCU project

Part Number: TMS320F28379D


I tested Dual-Axis Motor program with Qep encoder theses days. I noticed that motor would reverse at the beginning and shake violently, and then it will rotate normally. 

I'm very confused about that because I did't meet this situation in other servo controller.

I hope your answer soon! Thanks in advanced!