Electric Motor Control
10th Edition
ISBN: 9781133702818
Author: Herman
Publisher: CENGAGE L
expand_more
expand_more
format_list_bulleted
Concept explainers
Videos
Textbook Question
Chapter 31, Problem 8SQ
At what speed can a four-pole, 240-volt, 5-hp, 50-hertz motor operate?
Expert Solution & Answer
Trending nowThis is a popular solution!
Students have asked these similar questions
What is the full-load current of a 500-volt, DC, 20-horsepower motor?
2. A 10-HP, 1,750 rpm 550-volt shunt motor has an armature resistance of 1.55 ohms. If the armature takes 14.8 amp at full load, calculate the following:
the counter emf developed by the motor, volts?
the power developed by the motor, Watts?
How can you determine the current that a direct current motor will draw at start-up?
Chapter 31 Solutions
Electric Motor Control
Ch. 31 - Excluding slip, at what speed (r/min) will an...Ch. 31 - What is meant by the description separate winding...Ch. 31 - Prob. 3SQCh. 31 - Prob. 4SQCh. 31 - In Figure 314, what does the broken line between...Ch. 31 - When the high button is depressed in Figure 314,...Ch. 31 - Which coils are energized immediately when the...Ch. 31 - At what speed can a four-pole, 240-volt, 5-hp,...Ch. 31 - What is meant by the compelling action produced by...Ch. 31 - Prob. 10SQ
Knowledge Booster
Learn more about
Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, electrical-engineering and related others by exploring similar questions and additional content below.Similar questions
- Excluding slip, at what speed (r/min) will an eight-pole, 60-hertz, 240-volt motor run?arrow_forwardHow can the current that a direct current motor will consume at start-up be determined?arrow_forwardThe total armature current carried by a 50-hp four-pole 230-volt motor is 180 amp. If the winding is wave, how much current is handled by each path and by each brush arm if there are (a) four brush arms? (b) two brush arms?arrow_forward
- Your Answers may be presented through Discussions, Drawings/Figures/Diagrams, Reference to NEC/PEC and Computations. 1. What is the full-load current of a 500-volt, DC, 20-horsepower motor?arrow_forwardWhere is the best place to look to find specific information about a motor, such as horsepower, voltage, full-load current, service factor, and full-load speed?arrow_forwardA 20- hp DC motor is connected to a 500-volts DC line. What is the full load running current of this motor?arrow_forward
- What type of motor is known as a constant-speed motor?arrow_forwardWhat is the speed of a 200 kW, 430-V, three-phase, four –pole, 50 Hz ac motor?arrow_forwarda 220-volt, 20-horsepower compound motor (long shunt) has an armature resistance of 0.25 ohm, series field resistance of 0.19 ohm, and shunt field resistance of 33 ohms. (a) calculate the current taken by the motor at the instant of starting if it is connected directly to the 220-volt line (b) calculate the current when the motor is running if the armature is developing 184-volts counter-emfarrow_forward
- what is safe ? ac or dc motor ?arrow_forwardA 60-hp 230-volt shunt motor has a shunt-field resistance of 38.3 ohms and an armature resistance of 0.04 ohm. If the resistance in the starter is 0.66 ohm, calculate the current input to the motor at the instant it is started (assume 3-volts brush drop)arrow_forwardA 240-volt shunt motor takes 5 amperes on no-load. The armature resistance is 0.25 ohm and the field resistance is 200 ohms. Calculate the efficiency when taking full load current of 50 amperes and the percentage change in speed between no-load and full-load.arrow_forward
arrow_back_ios
SEE MORE QUESTIONS
arrow_forward_ios
Recommended textbooks for you
Electricity for Refrigeration, Heating, and Air C...Mechanical EngineeringISBN:9781337399128Author:Russell E. SmithPublisher:Cengage Learning
Delmar's Standard Textbook Of ElectricityElectrical EngineeringISBN:9781337900348Author:Stephen L. HermanPublisher:Cengage Learning
Electricity for Refrigeration, Heating, and Air C...
Mechanical Engineering
ISBN:9781337399128
Author:Russell E. Smith
Publisher:Cengage Learning
Delmar's Standard Textbook Of Electricity
Electrical Engineering
ISBN:9781337900348
Author:Stephen L. Herman
Publisher:Cengage Learning
Power vs Torque - In Depth Explanation and Mythbusting; Author: kyle.Engineers;https://www.youtube.com/watch?v=X7KWtf4wqN4;License: Standard Youtube License