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LAUNCHXL-F28069M: What is the lowest velocity which SpinTAC-POSCONV can manage?

Tran Binh Duong
Expert 2550 points
Part Number: LAUNCHXL-F28069M

Dear InstaSPIN-MOTION team,

I have a question related to the capability of velocity measurement of SpinTAC-POSCONV (Position Converter): what is the lowest velocity in RPM which it can manage while it still ensure the precision of measurement? 

In addition, when I read the QEP section in F28069 datasheet in which two methods of measuring velocity is described: one for range of high velocity and other for range of low velocity. I want to know which method did SpinTAC-POSCONV apply for?

Thank you!

  • 0
    Expert 2550 points

    Dear all,

    Is there anybody know the answer?

    Many thanks!

  • 0
    Guru 12800 points

    There is no specification for the lowest velocity of SpinTAC Position Converter, it is entirely based on the system you have designed.

    SpinTAC Position Converter can measure velocities as low as your encoder allows.  The effective minimum resolution of your encoder is (1 / <max count>) / <speed loop sample time> * 60 RPM.  This is why SpinTAC Position Converter includes a configurable low pass filter so that you can filter this speed in order to realize lower speeds than your encoder may allow.

    Tran Binh Duong said:
    I want to know which method did SpinTAC-POSCONV apply for?

    SpinTAC Position Converter only employs the pulse counting method for velocity calculation.

    The ability for your system to effectively control velocity at low speeds will also be based on the current loop gain and the speed loop gain.

  • 0 in reply to Adam D. Reynolds
    Expert 2550 points
    Thanks Adam for the clear answer!