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Instaspin BLDC hardware implementation

Hari Santhosh
Prodigy 20 points


I have seen demos explaining instaspin FOC performance , but everything was done with control suite by means of software we are building a solar car .My question is simple is hardware control possible in instaspin by means of an accelerator pedal ? Will the same performance will reflect as a result of sending control values via an accelerator instead of setting it in control suite?

  • 0
    Prodigy 20 points
    We are looking forward to get DRV 8301 H2 development kit , expecting your reply soon
  • 0 in reply to Hari Santhosh
    TI__Expert 4760 points

    Hello Hari,

    Yes, you can use InstaSPIN-FOC to perform traction control for an electric vehicle.  However, some hardware and software changes are required on your end:

    HARDWARE:  Depending on the accelerator pedal hardware, you will need to design an interface to the appropriate processor peripheral.  For example, if it is a simple potentiometer, the potentiometer output voltage must be scaled so that its value matches the 0 to 3.3V range of the ADC input.

    SOFTWARE:  The accelerator data must be scaled to a commanded Iq value to deliver the desired motor torque as a function of accelerator travel.  This Iq reference value must be clamped to the IMAX and IMIN limits at the reference input of the Iq current regulator, where IMAX and IMIN are a function of your application.  DO NOT connect the accelerator data to the commanded speed input.  Accelerator travel is proportional to desired torque, not desired speed.  So you don't want to have the speed loop driving the q-axis current controller.  The speed controller can be used if you have cruise control.  But for simple accelerator data, it should be applied to the q-axis current controller input directly.

    Regards,

    Dave

     

  • 0 in reply to Dave (Wisconsin) Wilson
    Expert 2550 points
    Dear Dave,

    You mean we can use InstaSPIN to control BLDC motor, right? Please share your knowledge to apply FOC algorithm to control BLDC because I haven't hear about this?

    Many thanks
  • 0 in reply to Tran Binh Duong
    TI__Guru 57255 points

    Hi Tran,

    You have replied to an old post with a new set of questions. 

    For new questions that you may have, please create a new forum post.


    Thank you,
    Brett

  • 0 in reply to Tran Binh Duong
    TI__Guru** 119670 points
    Tran,
    you can use InstaSPIN-FOC on BLDC motors (I'm assuming you mean it has a trapezoidal Bemf). As I mentioned in the other thread you will still be applying sinusoidal waveforms so you will lose a bit of torque capability with motors of these types. But you will have the improvements from FOC (better field alignment, reduced torque ripple, higher dynamic performance, higher speed capability, etc).
  • 0 in reply to ChrisClearman
    Expert 2550 points
    Thanks Chris!

    I will continue researching to apply InstaSPIN to control BLDC motor. I will be able to have some more question related to this topic.

    Best regards,