Which of the following is a factor that causes the magnetic field of a three-phase motor to rotate?
A) The voltages of a three-phase system are 90 degrees out of phase with each other.
B) The three voltages change polarity at regular intervals.
C) The pole pieces are wound such that they will always have the same magnetic polarities.
D) The stator windings are arranged around the outside of the motor.

Question

Quizplus · Accepted Answer

The three voltages in a three-phase system change polarity at regular intervals, creating a rotating magnetic field. This is fundamental to the operation of three-phase motors, as the sequential change in polarity across the phases generates a magnetic field that rotates around the stator, inducing rotation in the rotor.

Which of the Following Is a Factor That Causes the Magnetic