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CCS/INSTASPIN-BLDC: TMS320F28069/28062

Zhiqi SHAO
Intellectual 270 points
Part Number: INSTASPIN-BLDC


Tool/software: Code Composer Studio

I have some questions about the motor parameter setting in the USER MOTOR and ID Settings.

1.The  USER_MOTOR_RS indicates the identified phase to neutral resistance in a Y equivalent circuit。For three-phase winding , I can measure every two-phase resistance， and calculate the average。 Should  the delta connection be equivalent  to Y connection,and then calculate the resistance? 

2.The  USER_MOTOR_LS_q(or USER_MOTOR_LS_d) indicates identified average stator inductance. I just have a handheld LCR Meter, and just can measure every two-phase resistance ,and average them.Is this method right to calculate the  USER_MOTOR_LS_q? 

3. Dose the stator inductance of the motor very with the ambient conditions such as the temperature of motor winding , the rotating speed or the instant angle ?  The  INSTASPIN-FOC offers the Rs online Rcalibration, and I find that the Rs and the Flux will very when I run the  function of runRsOnline except the Lsd_H and Lsq_H showed in the figure. The Lsd_H and Lsq_H are showing no deference with the value of USER_MOTOR_LS_q.  Dose that mean the Lsd_H and Lsq_H won't very with the temperature or other  ambient conditions.

4.With no Rs Online Recalibration, What measures can I take to reduce impact of the change parameters. And are there any guidances to measure the parameters of motor to get accurate value of Rs and Ls？

  • 0
    TI__Genius 17175 points

    When measuring resistance or inductance across 2-phases, you can take the measured value and divide by 2. This is the value you use for InstaSPIN. Inductance will vary slightly with temperature, but the biggest factor in inductance change will be current. InstaSPIN does not offer a feature to re-measure inductance during run-time like it does for resistance. If you are experiencing a big change in inductance during running, you may use a look-up table to change Ld/Lq during run-time. Rs can be obtained online using the RsOnline function, or can be calculated by hand knowing the temperature and the winding material. Usually, the motor datasheet can specify change in winding resistance over some temperature range. 

    Sean