Q/ A 3-phose, 4 pole, 50Hz, 380V, IM, X-Conn.has Z₁ = 0.8+0.4 and Erecor+j2 52/phaseand No-load current of 1-j1 A. The full load speedis 1410 vipm@ Find Motor efficiency and P.F2) if the Torque is decreased by 10% Find efficiency andPower Factor.

Answered: A 3-phase, 4 pole, 50Hz, 380V, IM,…

Introductory Circuit Analysis (13th Edition)

13th Edition

ISBN:9780133923605

Author:Robert L. Boylestad

Publisher:Robert L. Boylestad

Chapter1: Introduction

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Q/ A 3-phose, 4 pole, 50Hz, 380V, IM, X-Conn.
has Z₁ = 0.8+0.4 and Erecor+j2 52/phase
and No-load current of 1-j1 A. The full load speed
is 1410 vipm@ Find Motor efficiency and P.F
2) if the Torque is decreased by 10% Find efficiency and
Power Factor.

Expert Solution

Step 1

The voltage across terminals, resistance across terminals, and magnetic force are three factors that affect motor performance. The output-to-input ratio is referred to as rotor efficiency. The output speed reduces correspondingly as the output torque rises. A motor performance curve, which frequently includes motor current draw and motor efficiency, is a typical way to demonstrate this power, speed, and torque connection. The torque delivered to the motor slows it down as the load grows, and "slip" heightens. The rotor conductors are severed by the stator magnetic field more frequently. The rotor is subjected to more force, increasing the rotor torque.

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