Understanding Ramp_up and spin_up parameters

Hello everyone . I haven’t been able to find anything related to ramp_up and spin_up parameters. When are they used ? I noticed on most posted topics they have similar values. Thanks
ramp_up_time”: 0.4000000059604645,
ramp_up_distance”: 12.5663709640502
“spin_up_current”: 10,
“spin_up_acceleration”: 400,
“spin_up_target_vel”: 400

They are only used to spin-up the motor for use with the sensorless estimator. I think their location at the axis object is confusing and we should move it to some “senorless” namespace.

You can check how they are used here.