b) A 15 kW induction motor with eight poles operates at 60Hz andshows a full-load slip of 3%.(i) What is the synchronous speed of the motor?(ii) Determine the rotor speed.(iii) Calculate the shaft torque at the rated load.The same motor is used as a generator for wind energy generation.(iv) Explain what is meant by doubly fed induction generator (DFIG)(v) Explain the main differences of operating the generator insubsynchronous mode and supersynchronous mode.

Slip s = 3% = 0.03 Poles p = 8 Frequency f = 60 Hz Output power Psh = 15 KW

b) A 15 kW induction motor with eight poles operates at 60Hz and shows a full-load slip of 3%. (i) What is the synchronous speed of the motor? (ii) Determine the rotor speed. (iii) Calculate the shaft torque at the rated load.

b) A 15 kW induction motor with eight poles operates at 60Hz and shows a full-load slip of 3%. (i) What is the synchronous speed of the motor? (ii) Determine the rotor speed. (iii) Calculate the shaft torque at the rated load.

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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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

b) A 15 kW induction motor with eight poles operates at 60Hz and
shows a full-load slip of 3%.
(i) What is the synchronous speed of the motor?
(ii) Determine the rotor speed.
(iii) Calculate the shaft torque at the rated load.
The same motor is used as a generator for wind energy generation.
(iv) Explain what is meant by doubly fed induction generator (DFIG)
(v) Explain the main differences of operating the generator in
subsynchronous mode and supersynchronous mode.

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