What are the reasons for unsatisfactory operation of ordinary series motorwhen it is operated from ac source? Explain them. Explain why universalmotor has weak field and strong armature.

A DC series motor is a universal motor because it works on AC as well as DC power supply. It is a…

Answered: operated from ac sc weak field and…

Engineering

Electrical Engineering

operated from ac sc weak field and stron,

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 4RQ

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Concept explainers

Power Measurement

According to Blondel's theorem, the total power is measured with one less number of wattmeters than the number of wires present in the system. So, a single-phase and two-wire system will require one wattmeter and a single-phase and the three-wire system will require two wattmeters, and a three-phase and the three-wire system will also require two wattmeters and a three-phase and the four-wire system will require three wattmeter devices. The wattmeter is a device that measures power using one voltage and one current input as shown in the above figure. Multiple current or voltage input pair cables are used by many power analyzers and digital storage oscilloscopes (DSOs) for measuring watts, in effect within a single instrument acting as multiple wattmeters. It is possible to measure three-phase and four-wire power with one correctly specified power analyzer.

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What are the reasons for unsatisfactory operation of ordinary series motor
when it is operated from ac source? Explain them. Explain why universal
motor has weak field and strong armature.

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