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DRV8711: TORQUE register change

M.Sivakumar
Prodigy 100 points
Part Number: DRV8711

Hi, I am using BOOST-DRV8711 board and Encoder feedback. 

My application needs to drive the motor with different Torque(torque settings in decimal 20 to 50) on running state.

My Idea: whenever motor lose its position on changing load, this lost position can be restored by increment the TORQUE register.

I tried this, sometimes motor was disabled from DRV8711 control by writing new value on torque register and no fault status was observed.

I want to know, Can it work? Frequently changing the torque register will make any problem?. is there any restriction to change Torque?

  • 0
    TI__Expert 4435 points
    Hi Sivakumar,
    You can change the torque register as intended and will not cause a problem. What you seeing might be an effect of the inductance of the motor, due to this, the change might not happen immediately.
    Another idea would be to change the gain settings as this is the other variable that affects the output current. Thank you.
  • 0 in reply to Luis Riveros
    Prodigy 100 points
    Hi Luis,
    You are right, i used current sensor circuit in series with motor to sense coil current that caused this issue. After removed circuit from motor, it is working fine now.
    Thanks.