New PDF release: Electricity 4: AC/DC Motors, Controls, and Maintenance

By Jeffrey J. Keljik

ISBN-10: 1111646759

ISBN-13: 9781111646752

Up to date to the 2011 nationwide electric Code, electrical energy four: AC/DC automobiles, CONTROLS, and upkeep, 10e provides sensible assurance of the AC/DC cars, controls, and the upkeep part of electric conception content material. It bargains easy accessibility to present info on DC automobiles, AC vehicles, motor regulate, electromechanical and solid-state relays and timers, synchronous cars, deploy, sensyn devices, motor upkeep, and extra. Combining thorough reasons of the way structures paintings with proper, hands-on examples of electric approach operation, this article will assist you advance the troubleshooting talents wanted within the box.

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Extra info for Electricity 4: AC/DC Motors, Controls, and Maintenance

Example text

Due to electronic rights, some third party content may be suppressed from the eBook and/or eChapter(s). Editorial review has deemed that any suppressed content does not materially affect the overall learning experience. Cengage Learning reserves the right to remove additional content at any time if subsequent rights restrictions require it. 38 UNIT 5 S TA R T I N G A N D O P E R AT I N G D C M O T O R S Manual starters for DC motors are rare because electronic controls are much more efficient and practical.

May not be copied, scanned, or duplicated, in whole or in part. Due to electronic rights, some third party content may be suppressed from the eBook and/or eChapter(s). Editorial review has deemed that any suppressed content does not materially affect the overall learning experience. Cengage Learning reserves the right to remove additional content at any time if subsequent rights restrictions require it. 34 UNIT 4 SUMMARY REVIEW OF UNITS 1–3 Select the correct answer for each of the following statements, and place the corresponding letter in the space provided.

For example, when a compound motor is ready to be placed into operation, a double check for proper compounding is necessary. It must be verified that the series field is aiding the shunt field flux. Connecting the compound motor is referred to as cumulative compounding. If this is not done, the motor may start at light load under the influence of the shunt field. As the load increases, the series field becomes more powerful. If the series field is an opposite polarity from the shunt field, the stator field becomes weaker.

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Electricity 4: AC/DC Motors, Controls, and Maintenance by Jeffrey J. Keljik


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