Chapter 23. Electric Motors and Generators. Introduction A Simple AC Generator A Simple DC Generator DC Generators or Dynamos AC Generators or Alternators DC Motors AC Motors Universal Motors Electrical Machines – A Summary. 23.1. Introduction.
A four-pole alternator is required to operate at 60 Hz. What is the required rotation speed?
A four-pole alternator has two pole pairs. Therefore the output frequency is twice the rotation speed. Therefore to operate at 60Hz, the required speed must be 60/2 = 30Hz. This is equivalent to 30 60 = 1800 rpm.