SPRUHJ1I January 2013 – October 2021 TMS320F2802-Q1 , TMS320F28026-Q1 , TMS320F28026F , TMS320F28027-Q1 , TMS320F28027F , TMS320F28027F-Q1 , TMS320F28052-Q1 , TMS320F28052F , TMS320F28052F-Q1 , TMS320F28052M , TMS320F28052M-Q1 , TMS320F28054-Q1 , TMS320F28054F , TMS320F28054F-Q1 , TMS320F28054M , TMS320F28054M-Q1 , TMS320F2806-Q1 , TMS320F28062-Q1 , TMS320F28062F , TMS320F28062F-Q1 , TMS320F28068F , TMS320F28068M , TMS320F28069-Q1 , TMS320F28069F , TMS320F28069F-Q1 , TMS320F28069M , TMS320F28069M-Q1
This frequency is used to ramp up the motor being identified to estimate the stator inductance (Ls) and flux. Typically, for PMSM motors a frequency of 20 Hz is high enough to estimate a stator inductance from a few tens of µH and higher. If the inductance is known to be in the single digits of µH and lower, then a higher frequency is recommended, up to 60 Hz for very low inductances. As an example, consider the Anaheim motor from the DRV8312 kit (Revision D board):
#define USER_MOTOR_FLUX_EST_FREQ_Hz (20.0)
If the typical value of 20 Hz exceeds the rated speed of the motor, set the frequency lower to stay less than the motor's rated speed.