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CCS/DRV8301-69M-KIT: DRV8301-69M-KIT

Vivishekh Sivan
Prodigy 130 points
Part Number: DRV8301-69M-KIT

Tool/software: Code Composer Studio

Hello,

when performing the motor(BLDC) identification using the lab 2a/b  the inductance (Ls) value is varying from 20% to 30%. Is there any issue in the identification or its good to go with the variation of 20% to 30%. There is no much variation in Rs or flux values. 

Rs = 0.02 ohms

Flux = 0.131 V/Hz

variation of Ls = 0.000090 H

Ls = 0.000055 H

Ls = 0.0000102 H

And, In this which value we can prefer for  Ls.

Thanks

Vivishekh

 

 

  • 0
    TI__Guru** 109680 points

    Improve the current and voltage sampling resolution by selecting or designing the appropriate board according to the spec. of the motor.

    You may try to tune the identification variables in the file of the user.h according to the motor and use lab02c to identify the motor.

    #define USER_MOTOR_RES_EST_CURRENT     (1.0)                               // A - 10-30% of rated current of the motor

    #define USER_MOTOR_IND_EST_CURRENT     (-1.0)                             // A - 10-30% of rated current of the motor, just enough to enable rotation

    #define USER_MOTOR_MAX_CURRENT           (5.0)                               // A - 30~150% of rated current of the motor

    #define USER_MOTOR_FLUX_EST_FREQ_Hz     (20.0)                           // Hz - 10~30% rated frequency of the motor

  • 0 in reply to Yanming Luo
    Prodigy 130 points

    How variation / tolerance can be acceptable in the inductance value(Ls/Ld).