Answered: Q/ A 220-V d.c. shunt motor runs at 500…

Q/ A 220-V d.c. shunt motor runs at 500 r.p.m. when the armature current is 50 A. Calculate the motor efficiency. Given that the rotational losses = 746 watt, Ra = 0.2 2, R = 250 . %3D

Electric Motor Control

10th Edition

ISBN:9781133702818

Author:Herman

Publisher:Herman

Chapter39: Synchronous Motor Operation

Section: Chapter Questions

Problem 14SQ: Induction motors and welding transformers require magnetizing current, which causes a. lagging power...

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Concept explainers

Motor Load, Torque, and Power Quality Requirement

An electric motor is a gadget that changes electrical energy into mechanical energy over to follow up on a mechanical burden. The weight set on the motor because of this mechanical movement is known as motor load. Appropriately matching the motor burden to the engine is vital to forestall harm to the engine or wasteful and unnecessary expensive activity. Engines perform such undertakings as moving a thing starting with one spot then onto the next, cutting it, changing its shape, etc. The motors might be evaluated as far as a few variables including power yield, voltage, current, and temperature. Harm to an engine might happen when it is worked under over the top engine load contrasted with its appraised limit.

Question

Q/ A 220-V d.c. shunt motor runs at 500 r.p.m. when the armature current is 50 A.
Calculate the motor efficiency. Given that the rotational losses = 746 watt , Ra = 0.2
2, Rh = 250 2.
%3D

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