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why no decouppling before IPARK transformation in TI's motor contol example software?

why no decouppling before IPARK transformation in TI's motor contol example software?

I mean the Ud, Uq (the outputs of PI regulator of Id and Iq)  are directly used as input for IPARK transformation in TI motor control software.

I think the decouppling should be done for Ud and Uq.

Anyone can explain this? many thanks in advance!