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
When identifying low-inductance PMSM motors, it is recommended to have the voltage divider for the voltage feedback as low as possible. For example if the voltage used to run the motor is 24 V, then the voltage resistor divider should be 26 V or so. This allows the maximum number of bits of the ADC converter when measuring the voltage feedback.
Once the hardware has been changed, update the USER_ADC_FULL_SCALE_VOLTAGE_V definition in user.h.
Usually, the low-inductance motors are high-speed motors, so the flux is small. The user needs to update the USER_IQ_FULL_SCALE_VOLTAGE_V to a value that lets the identification process identify the flux of the motor. The following equation can be used to determine a value for the definition of USER_IQ_FULL_SCALE_VOLTAGE_V: