four pole 2-Hp, 220-volts, 60-Hz, 3-Phase motorhas a delta connected stator and a Wye connected rotor. The ratio of which is 4:1. At full load, the slip is 2.5%. If the rotor resistanceper phase and the blocked rotor resistance and the blocked-rotor reactance are 0.3-ohm and 1-ohm respectively. Calculate a) the rotor current per phase b) The rotor power input at full-load c) the rotor copper loss at full load d) The rotor power develop at full load and e) The rotor torque develop.

four pole 2-Hp, 220-volts, 60-Hz, 3-Phase motorhas a delta connected stator and a Wye connected rotor. The ratio of which is 4:1. At full load, the slip is 2.5%. If the rotor resistanceper phase and the blocked rotor resistance and the blocked-rotor reactance are 0.3-ohm and 1-ohm respectively. Calculate a) the rotor current per phase b) The rotor power input at full-load c) the rotor copper loss at full load d) The rotor power develop at full load and e) The rotor torque develop.

Delmar's Standard Textbook Of Electricity

7th Edition

ISBN:9781337900348

Author:Stephen L. Herman

Publisher:Stephen L. Herman

Chapter33: Single-phase Motors

Section: Chapter Questions

Problem 32RQ

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Concept explainers

Stator and Rotor Magnetic Field

The stator and rotor magnetic field is the resulting magnetic field generated by a system of coils that are symmetrically aligned. They are supplied with polyphase currents. The magnetic field is generated by poly-phase (two or more phases) current or single-phase current. In the latter case, two field stator windings are supplied and two resulting electromagnetic fields are generated beyond the stage.

Question

2. A four pole 2-Hp, 220-volts, 60-Hz, 3-Phase motorhas a delta connected stator and a Wye connected rotor.
The ratio of which is 4:1. At full load, the slip is 2.5%. If the rotor resistanceper phase and the blocked
rotor resistance and the blocked-rotor reactance are 0.3-ohm and 1-ohm respectively. Calculate a) the
rotor current per phase b) The rotor power input at full-load c) the rotor copper loss at full load d) The
rotor power develop at full load and e) The rotor torque develop.

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