Torque Equation of a DC Motor
Torque or moment or moment of force is the tendency of a force to rotate or move an object about an axis. A force is a push or pull, likewise, torque is a twist to an object. Mathematically, torque, T = F × r.
Let

T_{g} = armature or gross torque (Nm) = Force × radius

r = radius of the armature in m

N = speed of the armature in rpm = N/60 rps
