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Topic Title: Inertia forumula query needed for calculating dynamic braking res
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Created On: 14 April 2013 09:26 AM
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 14 April 2013 09:26 AM
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benmc

Posts: 26
Joined: 02 November 2012

Hi
If anyone could help out that would be great,
I'm currently doing my BEng in E and E and for my final year project I am retro fitting VFD and PLC control to a long travel system on a crane(currently uses rotor resistance)

For calculating the correct size DBR one of the values I need is KgM^2 (inertia) I've looked over the old manuals for the crane but can only find KgM for each gearbox (4, 1 each corner) how would I go about calculating the inertia for the crane ?

Sorry if seems a bit vague and thanks in advance
 02 May 2013 08:17 AM
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sandip

Posts: 21
Joined: 31 March 2013

KgM indicates the Max. Torque can be generated by the Gear Box. You can convert this to Newton-meter by multiplying with 9.8 Now this torque is equal to moment of inertia x angular acceleration. You can find moment of inertia using this relation.Try this.
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