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1234ryan		 Any 1 can show the formula or equation of the polar moment of inertia, J of a motor? View All


13 years ago - 11 months left to answer. - 1 response - Report Abuse
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Niel
 The polar moment of inertia [1] is a integral function of the Volume, radius for the rotational section, and the density of the object.

Since a Motor rotor typically made out of multiple materials with different densities you must calculated the determine the sum of the individual PMI's

Niel Leon
engineering.com

13 years ago

Source: [1] http://en.wikipedia.org/wiki/Polar_moment_of_inertia


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