A 3-phase induction motor runs at a speed of 940 rpm at full-load when supplied with power at 50 Hz, 3-phase.
(a) How many poles does the motor have?
(b) What is its slip at full-load?
(c) What is the corresponding speed of:
(i) the rotor field wrt the rotor surface
(ii) the rotor field wrt the stator
(iii) what is the rotor speed at twice fullload slip?