Slot Pass Frequency
Another vibration component in electric motors is the so-called slot pass frequency. This frequency is the number of stator slots times the RPM. The stator slots contain the conducting windings, and their finite number creates a non-uniformity, or "cogging" in the rotating magnetic field that in turn causes a vibration component. The rotor bars are also in slots, and the rotor bar pass frequency is also sometimes called a slot pass frequency, and is different than the stator slot pass.
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