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TMS320F28027F: field weakening Issue

Dave Hunson
Expert 1760 points

Part Number: TMS320F28027F

Hi every one 

my motor is 380v , my Drive input voltage is 380v too. but when i am trying to speed it up to 1500RPM which is the maximum speed of motor.motor speed up to 750 rpm !

btw. i defined USER_MOTOR_POLS 4 (because my motor is 1500 RPM)

So,I tried field weakening which is in proj_lab 9.c ,but motor speed oscillate between  1500RPM and 1000 RPM in a course of few second,I tried to change Kp_spd but it did not work. 

Please help me.

regards.

Dave.

  • 0
    TI__Guru** 117020 points
    1. What type is the motor?
    2. It's pole pairs in user.h, not poles. So the pole pairs should be 2, not 4 in user.h if the rated speed of the motor is 1500rpm.
    3. What's the gMotorVars.VsRef? It must be less than _IQ(0.5) if you don't use overmodulation.

    Could you please post some current waveforms to show the question if possible?
  • 0 in reply to Yanming Luo
    Expert 1760 points

    thanks Dear Luo you already solve one of my problem .now I understood that pole pairs should be 2.

    1. What type is the motor? my motor is ACIM
    3. What's the gMotorVars.VsRef? It must be less than _IQ(0.5) if you don't use overmodulation.:ya dear Luo it is 0.5 (i did not used Over Modulation) .
    I will give you more detail about it later...

    Best regards.
    Dave.

  • 0 in reply to Dave Hunson
    Expert 1760 points
    thanks dear Luo
    the problem was from pole pairs which should be 2 not 4 ,as you mentioned .
    thanks again .
    Best Regards.
    Dave.