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motor not spinning at rated speed

Good day, everyone. I am using the DRV8312-C2 kit, running the PM_sensorless example code and debugging with CCS version 6. The motor that came with the drv kit is rated at 4000 rpm, however, i can only get 3000rpm. I did the necessary calculations and found that the base_frequency needs to be around 266Hz in order to get 4000 rpm (according to the base_rpm formula in the code). When i changed the frequency, the motor stalls at about 3100 rpm. Is there any way i can solve this problem? Any reply would be appreciated.

-Jason