Flywheel design for air compressor

[mdossaji]

I am designing a 2 cylinder reciprocating air compressor that uses around 13 HP. The air compressor is currently connected to a 15 HP motor. I want to add a flywheel to my design to limit the running torque. The motor is running at 1725 RPM. Can anyone guide me the proper method to perform the calculations?

 

[electricpete]

If the load will be DOL-started, then one consideration for maximum inertia is preventing the motor from damaging itself (or tripping) during starting.

Per NEMA MG-1 2009, Table 12-7 for 15HP, 1800RPM Design A or B motor, the maximum Load WK^2 (exclusive of motor WK^2) is 75 lb^ft^2

If there is belt or gears involved, the inertias need to be adjusted to motor speed.


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(2B)+(2B)' ?

 

[electricpete]

75 lb^ft^2
should have been
75 lb*ft^2


=====================================
(2B)+(2B)' ?

 

[mdossaji]

So pretty much I need to design my flywheel to be less than 75 lb*ft^2?

 

[electricpete]

Flywheel plus compressor inertia less than 75 lb-ft^2, assuming no belts present, based on NEMA requirements.

=====================================
(2B)+(2B)' ?