# Hi i am washing machine expert. sometimes i thought about to find RPM of any electric motor weather its small or large because its my passion to collect information about my business... so please give me the solution of problem. email. arslan_00@msn.com

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I was talk about that... how to check motor RPM? so the solution is....
Calculating Motor Speed:
A squirrel cage induction motor is a constant speed device. It cannot operate for any length of time at speeds below those shown on the nameplate without danger of burning out.
To Calculate the speed of a induction motor, apply this formula:
Srpm = 120 x F
P

Srpm = synchronous revolutions per minute.
120 = constant
F = supply frequency (in cycles/sec)
P = number of motor winding poles
Example: What is the synchronous of a motor having 4 poles connected to a 60 hz power supply?
Srpm = 120 x F
P
Srpm = 120 x 60
4
Srpm = 7200
4
Srpm = 1800 rpm

Posted on Jun 24, 2009

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Posted on Jan 02, 2017

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