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CCS/TMS320F28069M: Measuring Motor current on InstaSpin Foc (lab 5b)

Hiroyasu Matsubara
Expert 1405 points
Part Number: TMS320F28069M

Tool/software: Code Composer Studio

Hello,

I have a question about measuring motor current on InstaSpin Foc ,lab 5b.

We measured "Is_A" ( = square root of Id_A^2 + Iq_A^2), that is included "global Variable of motor",

and the result was unstable.

We think we could drive the motor correctly. (= We could use speed control by using Instaspin lab5b)

We would like to know motor current and consumption .

Is Is_A is not stable because it is a momentary measured value ?

Is there any other variable of motor current ,or should we calculate the average of the 

motor current , for example,measure 512 points of "Is_A" ,and calculate the average value of it ?

Hiroyasu

  • 0
    TI__Guru** 115440 points
    The Id is the real magnetic current and Iq is the real torque current to drive the motor, both two can't keep a constant, but closely near the setting reference value of Id_ref and Iq_ref, so the Is can't also keep a constant value, especially the load of motor is changing. You may calculate the average value according to your requirement.