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TIDM-THREEPHASE-BSDC: Why in DRV8412-C2-KIT Current regulation with PI controller ?

Part Number: TIDM-THREEPHASE-BSDC

In this kit the current is regulated by PI controller. I understand that it's ok when you keep rotor at some position or may be when you move the rotor with small frequency. My question is; Is it correct to track sinusoidal signal with PI controller ??