The following formula can be used to determine the speed of the rotating magnetic field when the frequency and number of stator poles per phase are known: S = ____.
A) 120 x (f / P)
B) 120 x f x P
C) (120 x f) / P
D) (120 - f) / P

Question

Quizplus · Accepted Answer

The correct formula to determine the speed of the rotating magnetic field is S = (120 x f) / P, where S is the speed of the rotating magnetic field in revolutions per minute (RPM), f is the frequency of the power source in hertz (Hz), and P is the number of stator poles per phase.

Option A is incorrect because it multiplies the frequency by 120, but does not divide by the number of stator poles per phase.

Option B is incorrect because it multiplies both the frequency and number of stator poles per phase by 120.

Option D is incorrect because it subtracts the frequency from 120, which is not a valid calculation.

The Following Formula Can Be Used to Determine the Speed