report speed of closed loop motor in constant torque mode

nikscha · 22 Sept 2023, 13:19

Hi all,
I want to know the speed in revs/min of my stepper motor when it's running in constant current mode. The object model currently doesn't provide this information (AFAIK).

o_lampe · 23 Sept 2023, 08:23

@nikscha I'm a bit confused by the term constant current? Isn't that the regular mode and the G1F-value indicates the speed?

I'm currently playing with a BLDC motor in constant torque mode. It is controlled by simpleFOC and their step/dir interface.
They also support stepper motors and have the option to read out shaft_velocity in rad/s. This value can be multiplied by 9.55 to get RPM.

nikscha · 25 Sept 2023, 08:26

@o_lampe Sorry, you're right, I must have been tired when writing this. I meant constant torque mode!

dc42 · 25 Sept 2023, 13:15

@nikscha please file an enhancement request at https://github.com/Duet3D/Duet3Expansion/issues.