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DRV10983: Can not reach desired speed using DRV10983EVM

Part Number: DRV10983

I am trying to run a motor from DRV10983EVM. 

It's a small outer rotor BLDC motor that can do 15000RPM using sensors. 

Once I try to run it without sensors from the DRV10983EVM, I can only achieve 2000 RPM.

I did not manage to run the motor Using closed loop. Using Open loop, I can control the speed by increasing the Open to Closed Loop Threshold. But the maximum speed I can achieve is 2000 rpm.