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Is SpinTAC-Velocity suitable for stopping motor suddenly ?

Hello:

In my application, I need to suddenly stop the motor without mechanical brake(motor is running in velocity mode). The motor runs at fixed speed, then it should be stopped VERY VERY quickly.

Can SpinTAC-Velocity achieve the same result as the traditional velocity PI controller for this application?

To achieve this sudden stop, I think I should adjust bandwidth as high as possible and bypass the speed trajectory ramp in lab5d. Am I correct?

Thank you.

  • ability to stop fast will depend on the motor and inverter design (especially how regen is handled) much more so than the controller.

  • Mao,

    SpinTAC Velocity should have no issues with stopping the motor as fast as possible.  I think it would have an even better result with less overshoot and oscillation than a PI controlller.  

    As long as your bandwidth is sufficiently high to control the application well, you wouldn't need to increase it further to get a fast stop.  Just bypassing the trajectory generator and setting a velocity reference of 0 should be enough.

  • also, I'll let Adam comment, but I think you can get best deceleration of course by setting the acceleration portion of the trajectory to its maximum, but also I would think get even a tiny bit better by initially seeding the output of the speed controller / input to the torque controller with a step change.