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TMS320F28069F: Over current problem at high RPM without loads

MingRi Yuan
Prodigy 80 points

Part Number: TMS320F28069F

Dear TI Instaspin motor solution team!

I could run proj_lab10a project for one motor.

The issues I am experiencing is that when the RPM goes over 370, the current suddenly ramps up to 20A.

Before 370, it only draws 300mA without any load.

I am really curious why this happens.

  • 0
    TI__Guru** 116860 points
    What poles is the motor? Did you get the correct motor parameters using lab02b/lab02c, and change the parameters in user.h?
  • 0 in reply to Yanming Luo
    Prodigy 80 points
    Hi Yanming
    Thanks for your reply

    The poles is 7 pairs, 14 poles.

    I could get correct parameter using lab02b.
    Let me add parameters I got.

    #define USER_MOTOR_Rs (2.200221) // Identified phase to neutral resistance in a Y equivalent circuit (Ohms, float)
    #define USER_MOTOR_Ls_d (0.008721023) // For PM, Identified average stator inductance (Henry, float)
    #define USER_MOTOR_Ls_q (0.008721023) // For PM, Identified average stator inductance (Henry, float)
    #define USER_MOTOR_RATED_FLUX (0.3846985) // Identified TOTAL flux linkage between the rotor and the stator (V/Hz)

    Does it seem reasonable?

    What I want to know how to get enough torque and how to make current and speed loop.
    Thanks in advance.
  • 0 in reply to MingRi Yuan
    TI__Guru** 119680 points
    what hardware are you using?
    what are the ratings of the motor (voltage / current)? It appears to be high voltage and low current.

    370 RPM is only 43 Hz. This is quite low to be having any issues.

    Are you trying to run a high voltage motor on a low voltage bus / inverter?