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Stepper motor spice model

Zsolt Barabas
Prodigy 60 points

Hi all, I'm searching for a stepper motor spice model, similar like the one presented in: http://e2e.ti.com/group/motor/m/files/639290.aspx , document called 004 Stepper Motors on page 15. That model is only a part from a more complex model. I would like to get that full model. Did anyone knows where to find it, or did anyone have a detailed stepper motor model?

  • 0
    TI__Guru** 114905 points

    Hi Zsolt,

    I will have to research this and get back with you. It may take a few days. 

  • 0 in reply to Rick Duncan
    TI__Mastermind 20985 points

    Zsolt, I talked with one of our designers, and we don't have a stepper SPICE model available.  The document you referenced is quite intricate.  A simple resistor+inductor in series can serve as a reasonable model for a stepper.  And of course, different motors vary greatly in what their resistance and inductance is, so you might need to custom model your particular motor.

    Best regards,
    RE

  • 0 in reply to RE
    Prodigy 60 points

    Hi RE

    unfortunately a real spice model for steppers is a lot more than an R-L in series. It have to deal with detent torque, back EMF, Eddy Currents etc. Than of course if you have the model properly defined, you can set the different values from the motor manufacturer's datasheet and simulate the circuit with different loads... which of course also cand be defined through spice. Because I struggeling putting head to head all those parameters and formulas, I would like to get a model which is more or less properly defined and try to get as close as possible to the real life stepper behaviour. Unfortunately it is hard to find such a model for steppers on the net.

  • 0 in reply to Zsolt Barabas
    TI__Expert 4760 points

    Hi Zsolt,

    The model you are referring to is one that I generated several years ago.  I have posted it on my blog site, which you can access via the following link:

    http://e2e.ti.com/group/motor/m/simulations/665168.aspx

    Please follow the provided instructions to properly download the files.  This model does in fact take into consideration detent torque and back EMF, but not eddy current losses.  To accurately simulate eddy current losses, you would probably need to construct an FEA based model.  This is simply a parametric model which assumes that all circuit elements are linear.  However, I have found that it yields fairly accurate results in most cases.

    -Dave

     

  • 0 in reply to Dave (Wisconsin) Wilson
    Prodigy 60 points

    Hi Dave,

    this is exactly what I'd searching for. I'd download it and tested it. It works brilliant! You did a great job. I will now try to connect it with simulink and play with that.

  • 0 in reply to Dave (Wisconsin) Wilson
    Intellectual 330 points

    Hi,

    Can you explain the working of the stepper motor model that you've provided. I mean how did you generate this model? was there any set of formulas that were used to generate it?

    I am a beginner so please do explain the circuit in details and how i can vary the various parameters as well.

    Thanks