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CCS/TMS320F28027: Applicaton question about the instaspin-foc speed pid

Part Number: TMS320F28027

Tool/software: Code Composer Studio

Hello,everyone.

I read the <instaspin project and lab user  guide>,but I have some problems about the speed pid calculating method in lab05b.

I set up the simulink model according to the motor parameters in labo5b.

but I can not get the step repose graph as the user guide paper.

the below graph is my siulink graph.it has a bigger overshoot than the graph above.

I do not know what it is the fault,please give a hand.

thanks