Answered: A 2 hp 50 Hz 3-phase 220 V delta wired…

Introductory Circuit Analysis (13th Edition)

13th Edition

ISBN:9780133923605

Author:Robert L. Boylestad

Publisher:Robert L. Boylestad

Chapter1: Introduction

Section: Chapter Questions

Problem 1P: Visit your local library (at school or home) and describe the extent to which it provides literature...

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A 2 hp 50 Hz 3-phase 220 V delta wired induction motor has a full-load rated speed of 1400 rpm. a) How many poles does the motor have? b) Calculate its rated output torque. c) What is the slip at full load? d) If the current is 6.37 A with a power factor of 0.79 at full load, what is the efficiency of the motor? e) Calculate the torque and approximate speed at ½ load. f) If a variable frequency drive were used to control the speed of this motor, what is the approximate maximum speed for the load from e)? What frequency would the drive be set to?

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