Gday
Quote:
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won't the moment of inertia of the whole mass be the biggest element that is to be overcome to get the load rotating since the body is at rest?
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Nope ( well partly no
)
As someone noted earlier, a small motor can get a large inertial mass moving as long as its balanced and has low friction,
but it takes time.
Where the effect of the inertial mass comes into play is
in respect to angular acceleration, ie "how fast" you can
"change the angular velocity" of the mass on its axle.
This will control how long it takes to get up to max speed,
for a given driving torque.
If you just google "Angular acceleration Torque"
you will get a lot of good basic descriptions on how it all ties together.
Andrew