General - Mechanical Time Constants for Servo Motors

Here is the equation used to calculate the mechanical time constant for the SM and NeoMetric motors:

Tau(m) = (R*J)/(Ke*Kt)

R: winding resistance
J: rotor inertia
Ke : back EMF constant
Kt : torque constant

(all units metric for this equation)

The mechanical time constant represents the amount of time for an unloaded motor to rise to 63.2% of its final velocity after application of a command voltage.

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