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

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By Jeffrey J. Keljik

Up-to-date to the 2011 nationwide electric Code, electrical energy four: AC/DC cars, CONTROLS, and upkeep, 10e can provide functional assurance of the AC/DC cars, controls, and the upkeep component of electric thought content material. It bargains easy access to present info on DC vehicles, AC vehicles, motor keep watch over, electromechanical and solid-state relays and timers, synchronous cars, deploy, sensyn devices, motor upkeep, and extra. Combining thorough factors of ways platforms paintings with appropriate, hands-on examples of electric approach operation, this article will assist you advance the troubleshooting abilities wanted within the box.

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

Example text

Circle the letter for each of the following statements that applies to a cumulative compound-wound DC motor. a. The speed regulation of a cumulative compound-wound DC motor is better than that of a shunt motor. b. The speed of a cumulative motor has a no-load limit. c. The speed of the motor decreases more for a given increase in load than does a differential motor. d. A cumulative motor has less torque than a shunt motor of the same hp rating for a given increase in armature current. e. The speed regulation of a cumulative motor is better than that of a series motor.

14. For proper operation in a four-lead DC motor, leads S1 and S2 should be connected to A1 and A2 in __________________________ a. parallel. b. series. c. shunt. d. series parallel. 15. Decreasing the resistance of a generator field rheostat _______________________ a. decreases the flux. b. decreases the voltage. c. increases the voltage. d. decreases the speed. 16. A series field, if connected across a motor armature and energized, _______________ a. makes the motor race dangerously. b. causes a short circuit.

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. UNIT 1 THE DC SHUNT MOTOR 17 of current to the field. The principle of the DC motor relies on the concept of commutation. This commutator and brush connection always keep the direction of the current and the direction of the magnetic field consistent.

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