A permanent-magnet dc motor has RA = 1.0 Ω. With no load, it operates at 1000 rpm and draws 1.0 A from a 15 V source. Assume that rotational power loss is proportional to speed. Find the output power and efficiency for a load that drops the speed to 950 rpm.

A permanent-magnet dc motor has RA = 1.0 Ω. With no load, it operates at 1000 rpm and draws 1.0 A from a 15 V source. Assume that rotational power loss is proportional to speed. Find the output power and efficiency for a load that drops the speed to 950 rpm.

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

Three Phase Induction Motor

The induction motor is an electric motor that runs on AC (alternating current) and it is of two type single phase motor that work on single-phase power supply and three-phase motor that work on three-phase power supply.

Question

A permanent-magnet dc motor has
RA = 1.0 Ω. With no load, it operates
at 1000 rpm and draws 1.0 A from a 15 V
source. Assume that rotational power loss
is proportional to speed. Find the output
power and efficiency for a load that drops
the speed to 950 rpm.

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