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 39, Problem 6SQ
Why must a discharge resistor be connected in the field circuit for starting?
Expert Solution & Answer
Want to see the full answer?
Check out a sample textbook solution
Students have asked these similar questions
Q choose the correct answer:
1-Brushless excitation system consisting of....
a- Stator field winding and power diodes
b-stator and rotor field winding and capacitor
c- stator and rotor field winding and capacitor
d- Everything mentioned in the options
2- Voltage generated per phase in an alternator is
proportional to
a- Flux per pole
b- Number of turns in armature
c-Winding factors
d- Everything mentioned in the options
e- Frequency of waveform
3- If input mech. Power of SG constant, the functionality of
AVR is
a- Control flux of rotor
b-Control terminal voltage
c- Control flux and terminal voltage
d-Control Load angle
a)Please explain the connection methods of Current and Voltage Transformers?
b) Control the DC motor speed and direction. Draw the circuit.
Question 11
Design a Duplex layer simplex lap winding DC machine armature winding by providing a complete wiring diagram with the following
Number of Poles: 2
Number of Slots; 8
Thank you and Godbless
ASAP pleasee
Chapter 39 Solutions
Electric Motor Control
Ch. 39 - Prob. 1SQCh. 39 - What is the effect of the starting winding of the...Ch. 39 - What are typical applications of synchronous...Ch. 39 - Prob. 4SQCh. 39 - A loaded synchronous motor cannot operate...Ch. 39 - Why must a discharge resistor be connected in the...Ch. 39 - Depending on their power factor ratings, what is...Ch. 39 - At what power factor do incandescent lights...Ch. 39 - Prob. 9SQCh. 39 - The speed of a synchronous motor is fixed by the...
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
- Identify the DC Generator used for Arc Welding purpose. With a neat sketch explain its working. List it's advantages and disadvantages.arrow_forwardQ2: b- Explain how does the three- phase induction motor work? *arrow_forwardAn 8-pole, 600 rpm dc shunt with 778 wave connected armature conductors of 12.5 ohms resistance at a terminal voltage of 250 volts. The armature resistance is 0.25 ohm the shunt field resistance is 250 ohms. Determine the flux per pole? (Our subject is Electrical Machines 1 ) (I need a clear answer and solution. Thank you so much)arrow_forward
- Identify the DC Generator used for Arc Welding purposes. with a neat sketch explain its working. List it’s advantages and disadvantages.arrow_forwardgenerator is 600 RPM, and on load generated voltage is 110 V. Calculate 03) A 4 pole wave wound short shunt compound DC Generator supplies a current of 100 A to a load of 10 KW through a cable of resistance Rcable is hundred times the resistance of one of the armature conductor, given that the series field resistance is 0.02 ohm, shunt field resistance is 200 ohm, flux per nole is 0.3 Web, total number of armature conductors is 120, speed of armature resistance. 1.arrow_forwardWhy is more than one coil used on a generator armature? a) to help keep the brush voltage as low as possible b) to increase the difference between the brush low voltage and brush high voltage c) to help maintain a more constant brush voltage d) none of the above . Which of the following is/are a type of DC generator armature winding configuration? a) lap b) wave c) frogleg d) all of the abovearrow_forward
- what is the conclusion for the concepts of rotating amature and rotating field in an alternator?arrow_forward2- A 4-pole, wave-wound d.c. shunt generator has an armature winding consisting of 300 turns each of 0.0020. The armature resistance is a) 0.152 b)0.62 c) 0.30 d) none of abovearrow_forward1. It is a machine that converts mechanical energy to electrical energy. 2. It is a machine that converts electrical energy to mechanical energy. 3. It is cylindrical or drum-shaped where the coils are placed and can either be lap wounded or wave wounded. 4. It connects the commutator to the other parts of the DC machine. 5. It serves as the housing of the dc machine. 6. True or False: The shunt field winding is part of the armature. 7. True or False: The long shunt compound generator is when the armature is in series with the series field winding and parallel to the shunt field winding. 8-10. Your newly built house needs an elevator. Which from the following will be best to use- series, shunt or compound motor and why?arrow_forward
- The use of contactors in motor starterarrow_forwardWhy it is much prefer in alternator to have station armature androtating poles?arrow_forward*Urgent need in 5 mins please* A 900 rpm, 4 pole lap wound shunt motor takes 300 A. The flux per pole is 0.02 Wb and the armature has 1500 conductors. The shunt field takes 4 A of current. Solve for power developed in the armature (W).arrow_forward
arrow_back_ios
SEE MORE QUESTIONS
arrow_forward_ios
Recommended textbooks for you
Delmar's Standard Textbook Of ElectricityElectrical EngineeringISBN:9781337900348Author:Stephen L. HermanPublisher:Cengage Learning
Electricity for Refrigeration, Heating, and Air C...Mechanical EngineeringISBN:9781337399128Author:Russell E. SmithPublisher:Cengage Learning
Delmar's Standard Textbook Of Electricity
Electrical Engineering
ISBN:9781337900348
Author:Stephen L. Herman
Publisher:Cengage Learning
Electricity for Refrigeration, Heating, and Air C...
Mechanical Engineering
ISBN:9781337399128
Author:Russell E. Smith
Publisher:Cengage Learning
How Electric Motors Work - 3 phase AC induction motors ac motor; Author: The Engineering Mindset;https://www.youtube.com/watch?v=59HBoIXzX_c;License: Standard Youtube License