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How to Determine SMO Parameters

Louis Zhu
Expert 1685 points
Other Parts Discussed in Thread: CONTROLSUITE

Since your documentation does not provide the description how to determine the parameters of your proprietary SMO, I had difficulty in making my PMSM working properly in mid to high speed range. Would you please advise a set of SMO parameters (Kslide, Kslf, E0) for my motor? Here is a list of my motor parameters. Thank you very much!

#define MOTOR_Rs   1.025 //Stator phase resistance, Ohm, 2.05 (L-L) / 2

#define MOTOR_Ls   0.00483 //Stator phase inductance, H, 9.66 mH (L-L) / 2

#define MOTOR_bEMF   0.0243 //back EMF, 24.3 V/kRPM converted to V/RPM

#define MOTOR_INERTIA   0.0000169 //Motor inertia, 169 g-cm^2 converted to kg-m^2

#define MOTOR_RATED_RPM   4990.0 //Motor rated speed, RPM

#define MOTOR_POLES   8 //number of poles of motor

#define MOTOR_RATED_VOLTAGE   340.0 //rated DC voltage (V)

#define MOTOR_RATED_CURRENT   4.15 //Continuous current RMS (A)

 

  • 0
    TI__Mastermind 27240 points

    Firstly, I recommend you to use eSMO instead as it has necessary compensations for better operation during mid and high speeds.

    Kslide is set up based on how the motor reacts during experiments. The value used in the controlsuite code is a good starting point for most motors. Feel free to change this value by a factor of, say, 2 and see if gives any better results.

    Kslf is internally decided and needs no user setup.

    E0 is set up at 0.5. Tune this value by a factor of 2 and see if it gives better  result.

    rgds,

    ramesh