Mechanical torque from rotor power equation

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bcteel

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In my studies for the PE power exam, I have come across the equation Tm = (p*Pr) / (4*pi*f)
Tm = mechanical torque
p = number of poles
Pr = power delivered to rotor
f = frequency in Hz

And I can not figure out how this equation was derived. Can anybody help explain this to me?
 

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