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A 4-pole, 3-phase, 50 Hz induction motor runs at 1440 rev/min at full load. Calculate (a) the synchronous speed, (b) the slip and (c) the frequency of the rotor induced e.m.f.'s.

A 4-pole, 3-phase, 50 Hz induction motor runs at 1440 rev/min at full load. Calculate (a) the synchronous speed, (b) the slip and (c) the frequency of the rotor induced e.m.f.'s.

Introductory Circuit Analysis (13th Edition)
Introductory Circuit Analysis (13th Edition)
13th Edition
ISBN:9780133923605
Author:Robert L. Boylestad
Publisher:Robert L. Boylestad
Chapter1: Introduction
Section: Chapter Questions
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4. A 4-pole, 3-phase, 50 Hz induction motor runs at 1440 rev/min at full load. Calculate (a) the synchronous speed, (b) the slip and (c) the frequency of the rotor induced e.m.f.'s. f (a) Synchronous speed, n¸ === P (b) Slip, s = i.e. (c) n || f Р n, -nf 115 slip, s = x 100% 25-24 25 50 = 25 rev/s or 25 x 60 1500 rev/min 2 where |×100% 1440 60 = n₂ 100 25 = 4% = 24 rev/s or frequency of the rotor induced e.m.f.'s, f=n× p = (25 – 24) (9) - 2 = 2 Hz
Transcribed Image Text:4. A 4-pole, 3-phase, 50 Hz induction motor runs at 1440 rev/min at full load. Calculate (a) the synchronous speed, (b) the slip and (c) the frequency of the rotor induced e.m.f.'s. f (a) Synchronous speed, n¸ === P (b) Slip, s = i.e. (c) n || f Р n, -nf 115 slip, s = x 100% 25-24 25 50 = 25 rev/s or 25 x 60 1500 rev/min 2 where |×100% 1440 60 = n₂ 100 25 = 4% = 24 rev/s or frequency of the rotor induced e.m.f.'s, f=n× p = (25 – 24) (9) - 2 = 2 Hz
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