Torque Production - h1011v4

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Electrical Science Volume 4 of 4
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AC MOTOR THEORY AC Motors where N_S = synchronous speed (rpm) N_R = rotor speed (rpm) The speed of the rotating magnetic field or synchronous speed of a motor can be found by using Equation (12-2). (12-2) N_S 120 f P where N_s = speed of rotating field (rpm) f = frequency of rotor current (Hz) P = total number of poles Example: A two pole, 60 Hz AC induction motor has a full load speed of 3554 rpm. What is the percent slip at full load? Solution: Synchronous speed: N_S 120 f P N_S 120 (60 Hz) 2 N_S 3600 rpm Slip: SLIP N_S N_R N_S x 100% SLIP 3600 3554 rpm 3600 rpm x 100% 1.3% ES-12 Page 6 Rev. 0

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