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DRV10963: FG_max

Hirotaka Matsumoto
Guru 27525 points
Part Number: DRV10963

Hi all

Would you mind if we ask DRV10963?

There is the description fFG_max (Hz) = 1300Hz on the datasheet P19.
->Therefore, is fFG_max (Hz) = 1300Hz fixed value? Is it possible to configure  fFG_max (Hz) = 2000Hz?
   We would like to know the content what fFG_max (Hz) depends on.

Kind regards,

Hirotaka Matsumoto

  • 0
    TI__Expert 6065 points
    Hey Hirotaka-san,

    1) Let me ask our design team how we achieved that FG max number.
    2) I just want to make sure you understamd that the FG is only the max electrical speed of the motor, it is not the mechanical. Mechanical speed = Electrical speed/NumberOfMotorPolePairs. Is the 2000Hz requirement an electrical frequency or mechanical frequency and how many pole pairs are your motor?

    Sincerely,
    Sanmesh U.
  • 0 in reply to Sanmesh Udhayakumar
    Guru 27525 points

    Sanmesh san

    Thank you for your reply!
    1) Let me ask our design team how we achieved that FG max number.
    ->OK, we are waiting for your update.

    2)Is the 2000Hz requirement an electrical frequency or mechanical frequency and how many pole pairs are your motor?
    ->12poles and 2000Hz is mechanical frequency(RPM).

    And then, if number of poles are 12, are number of pole paris 6? 

    If it is correct, is it possible to configure follows RPM?
    RPM  = (FREQFG x 120)/number of pole paris
              = (1300 x 120) / 6
              = 26000RPM (2600Hz)

    Kind regards,

    Hirotaka Matsumoto

  • 0 in reply to Hirotaka Matsumoto
    TI__Expert 6065 points
    1) Assuming your max speed is 2000 rpm mechanical speed and 12 poles, to convert from rpm to Hz electrical speed, Hz = Rpm*#Poles/(2*60) = Rpm*#PolePairs/(60) = Hz. So Hz = 2000*6/60 = 200Hz. source for this equation is here: ( www.engineeringtoolbox.com/synchronous-motor-frequency-speed-d_649.html ). Thus this is within the 1300 max FG or electrical frequency. Thus our device should be able to spin your motor. Thus I think your problem should be resolved.