How is the pole-pass frequency defined?

The pole-pass frequency is defined as the slip frequency multiplied by the number of poles in a motor. This term refers to the frequency at which the magnetic field of the motor passes each pole, which is critical for understanding the performance and operation of induction motors.

In an induction motor, the slip frequency represents the difference between the synchronous speed of the magnetic field and the actual speed of the rotor. By multiplying this slip frequency by the number of poles, one obtains the frequency at which a magnetic pole passes a given point, typically represented in Hertz (Hz). This concept is essential for analyzing motor behavior under different loading conditions and helps in diagnosing issues such as rotor locking or inefficiencies.

The other choices do not accurately represent how pole-pass frequency is calculated. For example, the line frequency relates to the supply current and is not specific to the behavior of the motor's poles. Similarly, the running speed of the motor, multiplied by the number of poles, doesn't yield the pole-pass frequency; instead, it affects the overall performance of the motor but does not define the frequency of pole passing. The difference between poles and synchronous speed does not align with the definition either, as it mixes concepts that don't directly define the pole-pass frequency. Thus, the pole-pass