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Confuse with value of Lsq = Lsd from motor data for user.h file

Amtech
Genius 4585 points

Other Parts Discussed in Thread: MOTORWARE

Dear all, 

We are using 7.5kw induction motor. 

We are confuse with value of Lsq = Lsd from below motor data for user.h file.

Pls suggest the value of Lsq = Lsd (Stator inductance)

  • 0
    TI__Guru** 119680 points

    the induction motor model is confusing as there are different ways to describe and many different variables / names.

    Here is a common nameplate for an induction motor.

    And here is the standard 5 parameter model

    and to go from the nameplate to the 5 parameters can be done like so:

    For FAST we introduce a 4 parameter induction model

    which we can then calculate the values as:

    and in user.h we would update as

    #define USER_MOTOR_Rr                   (6.8017)

    #define USER_MOTOR_Rs                   (9.25)

    #define USER_MOTOR_Ls_d                 (0.0352)

    #define USER_MOTOR_Ls_q                 (USER_MOTOR_Ls_d)

     

  • 0 in reply to ChrisClearman
    Expert 1110 points

    Hi! 

    In the lab 5a, how can I calculate the L parameter using Lsd and Lsq parameters to then calculate the KpSeries.

    I don't have the common nameplate.

    Thanks! 

  • 0 in reply to andres_dalmati
    TI__Guru** 119680 points

    In a non salient machine L=Lsd=Lsq. 

    If you look in the proj_lab02x labs there is a function recalcKpKi which shows the equations that are used inside the library to set the initial Idq gains. 

    You will notice that the same Kp and Ki are used for Id and Iq. If you have a salient motor with different Ld and Lq you could use these values to calculate different gains. But what works even better is a cross coupled current controller. We don't offer this in MotorWare, but you can implement yourself. There are some resources online.