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Setting max current at runtime

Steve Ressler
Intellectual 270 points

Other Parts Discussed in Thread: MOTORWARE

Hi,

Is it possible to change the maximum motor current at runtime, or is this only settable at compile time?

Thanks,

Steve

  • 0
    Guru 12800 points

    Steve,

    The maximum motor current is dynamically adjustable.  With SpinTAC it is an input parameter that can be modified with this function call:

    STVELCTL_setOutputMaximums(handle, OutputMaximum, OutputMinimum) [ for velocity control]

    STPOSCTL_setOutputMaximums(handle, OutputMaximum, OutputMinimum) [ for position control]

    This functionality has been already implemented in the MotorWare 13 InstaSPIN-MOTION labs and can be easily added to the MotorWare 12 InstaSPIN-MOTION labs.

  • 0
    TI__Expert 5180 points

    Yes you can change that on the fly by calling the following function:

    CTRL_setSpd_max_pu()

    This function limits the output of the speed controller in per units. So for example, if you are running the motor and you have these two definitions:

    #define USER_IQ_FULL_SCALE_CURRENT_A          (10.0)
    #define USER_MOTOR_MAX_CURRENT          (5.0)

    Then your speed max in per units is _IQ(5.0/10.0) or _IQ(0.5) which means 5 Amps. That is the default based on these two defines. If you want to change the maximum to 3 Amps for example, then you would have to call the above function as follows:

    CTRL_setSpd_max_pu(ctrlHandle, _IQ(0.3));

    -Jorge