Electric Motor Control
10th Edition
ISBN: 9781133702818
Author: Herman
Publisher: CENGAGE L
expand_more
expand_more
format_list_bulleted
Concept explainers
Question
Chapter 3, Problem 17SQ
To determine
Choose the correct option that represents the causes of the excessive hum in an AC magnet.
Expert Solution & Answer
Want to see the full answer?
Check out a sample textbook solution
Students have asked these similar questions
the armature mmf can be -2
reduced by
reluctance of the magnetic
the
circuit in the region of the pole
.tip
a) Increasing, O
b) decreasing O
c) don't put O
Answer the following questions using formulas, figures, and diagrams.(a) What is coenergy in magnetic circuits?(b) How to calculate iron losses using BH curve in magnetic circuits?
4: Write the symbol and define each of the following terms related to the permanent
magnet circuit design theory.
1- Magnetic Leakage Permeance.
2- Relative recoil permeability.
3- Flux concentration factor.
4-permeance coefficient
Chapter 3 Solutions
Electric Motor Control
Ch. 3 - Prob. 1SQCh. 3 - How many poles are required on motor starters for...Ch. 3 - If a motor starter is installed according to...Ch. 3 - Using the time limit overload or the dashpot...Ch. 3 - What causes the AC hum or chatter in AC...Ch. 3 - What is the phase relationship between the flux in...Ch. 3 - In what AC and DC devices is the principle of the...Ch. 3 - What does the electrician look for to remedy the...Ch. 3 - What type of protective enclosure is most commonly...Ch. 3 - What advantage is there in using combination...
Ch. 3 - What safety feature does the combination starter...Ch. 3 - Prob. 12SQCh. 3 - How is the size of the overload heaters selected...Ch. 3 - What type of motor starter enclosure (include NEMA...Ch. 3 - Prob. 15SQCh. 3 - Prob. 16SQCh. 3 - Prob. 17SQCh. 3 - Prob. 18SQCh. 3 - Select the best answer for each of the following....Ch. 3 - Prob. 20SQCh. 3 - Prob. 21SQCh. 3 - Select the best answer for each of the following....Ch. 3 - Prob. 23SQCh. 3 - Select the best answer for each of the following....Ch. 3 - Select the best answer for each of the following....Ch. 3 - Select the best answer for each of the following....Ch. 3 - Select the best answer for each of the following....Ch. 3 - Prob. 28SQCh. 3 - Select the best answer for each of the following....Ch. 3 - Prob. 30SQCh. 3 - Prob. 31SQCh. 3 - What is the difference between a grounded control...Ch. 3 - A control transformer has a primary voltage of 480...
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
- 3. a) List the difference between destructive and non- destructive testing b) Give five examples of materials used for the design of any type of insulation. c)when a transformer full of magnetic material is overloaded and heats up what do you think would happen to the magnetic properties, and which law would the material be associated with in you understanding?arrow_forwardCalculate the voltage of the DC source and the stored field energy of the actuator illustrated infigure 1.1. The dimensions of the magnetic circuit proposed in shown figure 1.2. The core of the magnetic circuit is made of cast steel material whose B-H characteristics is illustrated in figure 1.3. The coil in figure 1.1 has 250 turns, and the coil resistance is 5 ohms. For a given length g=5mm, a Dc source is connected to the coil to produce a flux density of 1 Tesla in the air gap.arrow_forwardA. The brushes used in a DC generator a) ride against the commutator segments. b) are made from material softer than the commutator segments. c) are generally marked Al and A2 d) all of the above B. A magneto is a DC generator that uses for its pole pieces. a) electromagnets b) permanent magnets c) either "a" or "b" d) neither "a" nor "b"arrow_forward
- The dimensions of the circuit and the number of windings are indicated on the figure. a) Draw the equivalent circuit. b) Find the equivalent reluctance value of the magnetic circuit. c) Find the value of the total magneto-motor force produced by the coils wound on the magnetic core. d) Find the values of total magnetic flux and arm magnetic flux flowing through the magnetic circuit. e) Find the self-inductance value of each winding and the common inductance value between the windings.arrow_forward#4. Please answer--What are the factors responsible for the execution of Spark?.arrow_forwardExplain very briefly about the flux fringing and their place of occurrences.arrow_forward
- 4. Explain the relationship between back emf E, terminal voltage V and coil voltage drop IR in DC motor and generator respectively. i. Describe how the field strength affect the performance of DC motor and generator. ii. Explain how an external resister changes the DC motor and generator performance.arrow_forwardPermanent magnet moving coil (PMMC): Select one: a. a moving coil & a pair of permanent magnets used basically for DC measurements. b. none of the given answers. C. a moving coil & a pair of permanent magnets used basically for AC measurements. d. a moving coil & a pair of permanent magnets used basically for DC and AC measuremnents.arrow_forwardThe amount of torque on a current-carrying conductor in a magnetic field depends upon a. the amount of current in the conductor. b. the direction of the magnetic field between the two poles. c. the current direction in the conductor. d. the direction of rotation. e. the left-hand rule. To obtain motor action, current is supplied to a loop of wire in a magnetic field by a. slip rings. b. split rings. c. a commutator. d. brushes. e. brushes and a commutator. If another loop of wire is added to make a double-loop armature, a. the torque becomes steadier. b. the magnetic field decreases in value. c. loop current direction is affected. d. the torque becomes less smooth. e. commutator segments must be reduced in number. The principle of motor action is a. a conversion of mechanical energy to electrical energy. b. a conversion of chemical energy to electrical energy. c. a conversion of electrical energy to mechanical energy. d. an unpredictable phenomenon. e. predictable with the left-hand…arrow_forward
- 3. i. Write the working principle of Permanent Magnet Moving Coil instrument mention the importance spring used. ii. Explain how a single PMMC instrument can be used as ammeter and voltmeter.arrow_forwardNonearrow_forwardQUESTION 1 A ferromagnetic core is shown in Figure 1. The depth of the core (in to page) is 15cm, and the other dimensions are shown in the figure. There is a 150-turn coil wrapped around the left side of the core with input current is 2 Ā. a) Draw and label a magnetic circuit of ferromagnetic core below b) Assuming relative permeability, pr of 2400,calculate: i. Total reluctance ii. Magnetomotive force of the circuit Total flux of the circuit ii. 15cm 20cm 15cm 15сm N= 150 20cm 15cm 15cm 20cm 15cm Figure 1: Ferromagnetic Corearrow_forward
arrow_back_ios
SEE MORE QUESTIONS
arrow_forward_ios
Recommended textbooks for you
Introductory Circuit Analysis (13th Edition)Electrical EngineeringISBN:9780133923605Author:Robert L. BoylestadPublisher:PEARSON
Delmar's Standard Textbook Of ElectricityElectrical EngineeringISBN:9781337900348Author:Stephen L. HermanPublisher:Cengage Learning
Programmable Logic ControllersElectrical EngineeringISBN:9780073373843Author:Frank D. PetruzellaPublisher:McGraw-Hill Education
Fundamentals of Electric CircuitsElectrical EngineeringISBN:9780078028229Author:Charles K Alexander, Matthew SadikuPublisher:McGraw-Hill Education
Electric Circuits. (11th Edition)Electrical EngineeringISBN:9780134746968Author:James W. Nilsson, Susan RiedelPublisher:PEARSON
Engineering ElectromagneticsElectrical EngineeringISBN:9780078028151Author:Hayt, William H. (william Hart), Jr, BUCK, John A.Publisher:Mcgraw-hill Education,
Introductory Circuit Analysis (13th Edition)
Electrical Engineering
ISBN:9780133923605
Author:Robert L. Boylestad
Publisher:PEARSON
Delmar's Standard Textbook Of Electricity
Electrical Engineering
ISBN:9781337900348
Author:Stephen L. Herman
Publisher:Cengage Learning
Programmable Logic Controllers
Electrical Engineering
ISBN:9780073373843
Author:Frank D. Petruzella
Publisher:McGraw-Hill Education
Fundamentals of Electric Circuits
Electrical Engineering
ISBN:9780078028229
Author:Charles K Alexander, Matthew Sadiku
Publisher:McGraw-Hill Education
Electric Circuits. (11th Edition)
Electrical Engineering
ISBN:9780134746968
Author:James W. Nilsson, Susan Riedel
Publisher:PEARSON
Engineering Electromagnetics
Electrical Engineering
ISBN:9780078028151
Author:Hayt, William H. (william Hart), Jr, BUCK, John A.
Publisher:Mcgraw-hill Education,