Problem # 4 A three phase induction motor runs at almost 1198 r/min at no load and 1112 r/min at full load when supplied from a 60 Hz, three phase

Problem # 4

A three phase induction motor runs at almost 1198 r/min at no load and 1112 r/min at full load when supplied from a 60 Hz, three phase source.

a. How many poles does this motor have?

b. What is the slip in percent at full load?

c. What is the corresponding frequency of the rotor current?

d. What is the corresponding speed of the rotor field with respect to the rotor? With respect to the stator?