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TMS320F2800157: SVPWM modulation issue

zcwbj
Prodigy 80 points

Part Number: TMS320F2800157
Other Parts Discussed in Thread: MOTORWARE

Hi TI team:

      I am running the universal motor control programmer for my own board and my own motor , LEVEL 4  ,FAST lib . As below picture.

Blue line is the U phase currrent , Green line is U phase PWM ,   Pink line is the ADC signal for U phase current.

why the PWM wavefome like this , how to change the PWM modulation to full PWM control for entire period of the current 

my question is whether this kind of PWM modulation will influence the startup capbility of the solution 

Per our experience the PWM is as below with previous motorware solution.  the PWM work in the whole current period including the positive half  period and minus half period

  • +1
    TI__Guru** 117140 points
    zcwbj said:
    my question is whether this kind of PWM modulation will influence the startup capbility of the solution

    No. The output of the PWM is correct and normal.

    zcwbj said:
    Per our experience the PWM is as below with previous motorware solution.  the PWM work in the whole current period including the positive half  period and minus half period

    Related to the SVPWM mode. The SVPWM mode is the DPWM-Min in the current project. You can change the SVM mode by setting svmMode to common SVM mode as below in motor1_drive.c

    if(objUser->flag_bypassMotorId == true)
    {
    #if defined(MOTOR1_DCLINKSS)
    obj->svmMode = SVM_COM_C;
    #else // !(MOTOR1_DCLINKSS)
    obj->svmMode = SVM_COM_C;
    #endif // !(MOTOR1_DCLINKSS)
    obj->flagEnableFWC = true;
    }
    else
    {
    obj->svmMode = SVM_COM_C;
    obj->flagEnableFWC = false;
    }

  • 0 in reply to Yanming Luo
    Prodigy 80 points

    Hi Yanming : 

       thanks a lot .

    can you help explain the four  mode of SVPWM.

    which application can use the  SVPWM common SVM mode

    which application can use the  DPWM minimum SVM mode

    which application can use the  DPWM maximum SVM

    which application can use the  DPWM SVPWM standard DQ mode

    what effect have on the control performance for the 4 mode of pwm

  • 0 in reply to zcwbj
    TI__Guru** 117140 points

    You can find lot of the related documentation on the website. Only  SVPWM common SVM mode and DPWM minimum SVM mode can be used for low-side current sensing mode in the example labs.