A 8.5-hp, 200 V d.c. shunt motor running light takes a current of 4 A. The field resistance is 100 2 armature resistance is 0.6 2. Calculate: (i) Speed regulation. (ii) The efficiency. (iii) The armature current at which efficiency is maximum

A 8.5-hp, 200 V d.c. shunt motor running light takes a current of 4 A. The field resistance is 100 2 armature resistance is 0.6 2. Calculate: (i) Speed regulation. (ii) The efficiency. (iii) The armature current at which efficiency is maximum

Delmar's Standard Textbook Of Electricity

7th Edition

ISBN:9781337900348

Author:Stephen L. Herman

Publisher:Stephen L. Herman

Chapter30: Dc Motors

Section: Chapter Questions

Problem 19RQ: A motor is operating a load that requires a torque of 750 lb-in. and is turning at a speed of 1575...

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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

A 8.5-hp, 200 V d.c. shunt motor running light takes a current of 4 A. The field
resistance is 100 2 armature resistance is 0.6 2. Calculate:
(i) Speed regulation.
(ii) The efficiency.
(iii) The armature current at which efficiency is maximum

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