Answered: A 4-pole, 3-phase, 50 Hz induction…

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.

Delmar's Standard Textbook Of Electricity

7th Edition

ISBN:9781337900348

Author:Stephen L. Herman

Publisher:Stephen L. Herman

Chapter35: Harmonics 916

Section: Chapter Questions

Problem 3RQ: Would a positive-rotating harmonic or a negative-rotating harmonic be more harmful to an induction...

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Concept explainers

Three Phase Induction Motor

The induction motor is an electric motor that runs on AC (alternating current) and it is of two type single phase motor that work on single-phase power supply and three-phase motor that work on three-phase power supply.

Question

Why did they divide it by 60?

Where does the Formula from Letter C came from?

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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