A 400v, 4-Pole, 50z, 3-Phase, 10hp, Y-Connected induction motor has a no load slip of 1% and full load slip of 4%. Find the following: (i) Syn. Speed (ii) No load speed (iii) Full load speed (ix) Frequency of rotor current at full load (v) Full load torque. - E Tips BD

## Wednesday, June 19, 2019

A 400v, 4-Pole, 50z, 3-Phase, 10hp, Y-Connected induction motor has a no load slip of 1% and full load slip of 4%. Find the following:  (i) Syn. Speed   (ii) No load speed  (iii) Full load speed  (ix) Frequency of rotor current at full load  (v) Full load torque.

Solution-6:

Here,
Pout = 10hp = 10*746 = 7460Watt, Pole, P = 4, f = 50Hz, VL =400v
(i)  Syn. Speed   NS = 120f/P = 120*50/4 = 1500rpm
(ii)  No load speed  NO = NS(1-s) = 1500(1-0.01) = 1485rpm
(iii) Full load speed, NFL = NS(1- sfl) = 1500(1-0.04) = 1440rpm
(ix) Frequency of rotor current, fr = sfl .f = 0.04*50 = 2Hz
(v) Full load torque, Tsh = 9.55Pout/NFL = 9.55*7460/1440 = 48.78Nm

EEE Job Math-6
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