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HOW TO REMEMBER FORMULA AND CALCULATOR?

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Motor synchronous speed

motor image credit: Wikipedia.com

Solve the motor synchronous speed generated by specified operational frequency of 60 Hz and number of stator is 4 pole.

Synchronous speed, Ns (rpm)
=
f x 120
P

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Memory recall lesson learned :

RPM = revolution per minute ; 1 hp = 33,000 lb-ft per minute ; 1 revolution = 2π
2π = 6.2832 ; 33,000 /6.2832 = 5252 ; 33,000 lb-ft per minute = 396,000 lb-in per min ; 396,000/6.2832 = 63024 ; FPM = feet per min ; FPM = 0.262 RPM * Diameter in inches



 

 

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