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 　 石磊　 2004-11-29 15:37:56
The Moment of Inertia for a flat disc with a hole in the center is: I = M/2 · (square(R1) + square(R2)) Where I = Moment of Inertia M = Mass (weight) of the disc R1 = Radius of inner hole R2 = Radius of the disc

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 　 石磊　 2004-11-29 15:53:34
The moment of inertia is dependent on the external object, but how to estimate damping ratio of a dc motor is still not clear.

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