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Senthil G
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Join Date: Apr 2011
Posts: 1

Equ Moment of Inertia

04/27/2011 10:25 AM

Hi,

I have DC motor coupled with gear box contains Spur gear (1:2) , worm gear (1:36) and Sun and three planetary gears (1:4) connected in series with shaft. The total GR is (1:288).

Please let me know how to calculate equivalent moment of inertia for the system.

Thanks and Regards,

Senthil G
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TonyS
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Join Date: Aug 2010
Location: Resting under the Major Oak
Posts: 4347
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#1

Re: Equ moment of inertia

04/27/2011 10:36 AM

Homework?

Or was the designer of the gearbox drunk?

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fixitorelse
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Join Date: Aug 2010
Posts: 687
Good Answers: 21
#2

Re: Equ Moment of Inertia

04/27/2011 1:54 PM

Got a picture of this gear box you can post. Something is not quite right in the description you gave. Also a manufactures model number.
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Codemaster
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Join Date: Jul 2005
Location: Stoke-on-Trent, UK
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#3

Re: Equ Moment of Inertia

04/28/2011 6:39 AM

Referred to motor speed, the moment of inertia of each rotating part is its own MoI divided by r2, where r = speed ratio (r > 1 for a reducing gearbox). So you need to know the MoI of each part. The total MoI is the sum of all the parts.

But you haven't mentioned the load (running at 1/288 of motor speed). This is usually a bigger contribution to the total MoI than the gearbox, but is calculated the same way.

Cheers.........Codey

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