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TMS320F28069F: Field Weakening in LAB9

Andrew Buckin
Expert 2070 points
Part Number: TMS320F28069F

Tool/software:

when I turn on Field Weakening in LAB9a, the controller accelerates the motor very strongly and then everything goes into a stupor.

tell me where to look and read about Field Weakening at such power. I need a speed of about 4KRPM on 1.6..3 KW.

I have. 
#define USER_ADC_FULL_SCALE_CURRENT_A (660.0)
#define USER_IQ_FULL_SCALE_CURRENT_A (USER_ADC_FULL_SCALE_CURRENT_A * 0.5)

Andrew.

  • 0
    Expert 2070 points

    Can someone explain this BUG or what these numbers are IQ. Macros are set to 1000 but there is no type conversion anywhere.

    FW_setDeltas(fwHandle, FW_INC_DELTA, FW_DEC_DELTA);

//! \brief Defines the Field Weakening (FW) increment delta correction
//!
#define FW_INC_DELTA (1000)

//! \brief Defines the Field Weakening (FW) decrement delta correction
//!
#define FW_DEC_DELTA (1000)



static inline void FW_setDeltas(FW_Handle fwHandle, const _iq delta_inc, const _iq delta_dec)
{
FW_Obj *fw = (FW_Obj *)fwHandle;

fw->delta_inc = delta_inc;

fw->delta_dec = delta_dec;

return;
} // end of FW_setDeltas() function

  • 0
    Expert 2070 points

    additional BUG in the function uint16_t HAL_AdcCalConversion(HAL_Handle handle). usDelay(US_TO_CNT(ADC_DELAY_usec)); why do you convert microseconds to CNT and substitute it into the microseconds function. Maybe you shouldn't use the US_TO_CNT macro? :( :)

  • 0 in reply to Andrew Buckin
    TI__Expert 4440 points

    Hi Andrew,

    Could you please provide answers to the question below so that we can better help you on the issue?

    1. What is the hardware/inverter you are using? Do you use standard EVM or customized board? What motor are you using?

    2. Have you verify the previous labs, e.g., Lab5b?

    Thanks,

    Jiaxin

  • 0 in reply to Jiaxin Teng
    Expert 2070 points

    I use epc9186, Motor - Hacker-A40 in oil cooling. I can accelerate the Motor in lab9a to 2.2KMP but when I set FW. The Motor starts to vibrate strongly and goes into a squeak. Probably a breakdown of the PWM. I have already accelerated this Motor to 3.5 KRPM - about 30A DC. I used lab9a on 027F. Now I have switched to 069F. And I cannot achieve the previous success. :( 

  • 0 in reply to Jiaxin Teng
    Expert 2070 points
    gMotorVars.IdRef_A = _IQmpy(CTRL_getId_ref_pu(ctrlHandle), _IQ(USER_IQ_FULL_SCALE_CURRENT_A);  
    looking through the code I noticed that mine USER_IQ_FULL_SCALE_CURRENT_A 330 which is significantly more than the permissible value for _IQ - 127. until now I have not had any problems since the maximum current was up to 80A. InstaSpin can not work with powerful motors? Or should it be reduced by 3 .. 4 times?
  • 0 in reply to Andrew Buckin
    TI__Expert 4440 points

    Hi Andrew,

    Happy New Year. What is your VsRef settings? Can you try to tune the value of "VsRef"? Please also reduce the load of the motor.

    Thanks,

    Jiaxin

  • 0 in reply to Jiaxin Teng
    Expert 2070 points
    VsRef = 0.8*(2.0 / 3.0) or 0.8*0.5 It is possible to reduce the load, but I would like to achieve results like with 027F.
  • 0 in reply to Andrew Buckin
    TI__Expert 4440 points

    Hi Andrew,

    Andrew Buckin said:
    The Motor starts to vibrate strongly and goes into a squeak. Probably a breakdown of the PWM

    So I assume the above described observation only applies to 069F? Could you share some waveforms and readings of key variables at this moment, e.g., PWM, the calculated Id_ref, etc.?

    Andrew Buckin said:
    I have already accelerated this Motor to 3.5 KRPM - about 30A DC. I used lab9a on 027F.

    Does this apply to the case with 027F? 

    Thanks,

    Jiaxin

  • 0 in reply to Jiaxin Teng
    Expert 2070 points
    1. thanks for your attention. i have several boards. i plan to use gan transistors. and i need more power. i collected all i need in one project on github.for 027 I have the same motor. but the board is different. not as powerful. 160 A Full scale.github.com/.../Valkyrie9plus