Answered: 1. When running at its operating speed,…

1. When running at its operating speed, a 215-V dc motor with an armature whose resistance is 1.70 2 draws a current of 22.0 A. What is the back emf of the motor when it is operating normally?

Electricity for Refrigeration, Heating, and Air Conditioning (MindTap Course List)

10th Edition

ISBN:9781337399128

Author:Russell E. Smith

Publisher:Russell E. Smith

Chapter8: Basic Electric Motors

Section: Chapter Questions

Problem 11RQ

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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

1. When running at its operating speed, a 215-V dc motor with an
armature whose resistance is 1.70 2 draws a current of 22.0 A. What is
the back emf of the motor when it is operating normally?

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