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### Author Topic: Servo spindle stops briefly - How do I diagnose problem?  (Read 717 times)

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#### joeaverage

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##### Re: Servo spindle stops briefly - How do I diagnose problem?
« Reply #10 on: May 17, 2019, 10:09:08 AM »
Hi,
acceleration is proportional to torque.

Angular accel (radians/sec2) =Torque (Nm) x I (first moment of rotational inertia, kg/m2)

In a servo the torque is directly proportional to current and related to each other by the constant KA, a figure
of merit of any given servo.

torque (Nm)= I (current,  Amp) x KA (Nm/Amp)

Even if the DMM does not have a max torque (and therefore acceleration) setting it will certainly have a max current setting.
It is the norm to set the max current (and therefore torque/accel) to be 10% higher than the maximum acceleration equivalent
in Machs motor tuning. Therefore the max accel will still be given by Machs motor tuning but the drive itself will limit the torque
further at  some greater figure.

Craig
My wife left with my best friend...
and I miss him!