Electric Machinery and Power System Fundamentals
1st Edition
ISBN: 9780072291353
Author: Stephen J. Chapman, Stepehn J. Chapman
Publisher: McGraw-Hill Companies, The
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Chapter 1, Problem 1.14Q
To determine
To discuss: The reason for considering a linear machine a good example of the behavior observed in the real dc machine.
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Explain the Construction and Applications of DC Machines.
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Chapter 1 Solutions
Electric Machinery and Power System Fundamentals
Ch. 1 - What is torque? What role does torque play in the...Ch. 1 - What is Amperes law?Ch. 1 - What is magnetizing intensity? What is magnetic...Ch. 1 - How does the magnetic circuit concept aid in the...Ch. 1 - What is reluctance?Ch. 1 - What is a ferromagnetic material? Why is the...Ch. 1 - How does the relative permeability of a...Ch. 1 - Prob. 1.8QCh. 1 - What are eddy current losses? What can be done to...Ch. 1 - Why are all cores exposed to ac flux variations...
Ch. 1 - What is Faraday law?Ch. 1 - What conditions are necessary for a magnetic field...Ch. 1 - What conditions are necessary for a magnetic field...Ch. 1 - Prob. 1.14QCh. 1 - The linear machine in Figure 1-19 is running at...Ch. 1 - Just how does a decrease in flux produce an...Ch. 1 - Will current be leading or lagging voltage in an...Ch. 1 - What are real, reactive, and apparent power? What...Ch. 1 - What is power factor?Ch. 1 - Prob. 1.1PCh. 1 - A flywheel with a moment of inertia of 4kgm2 is...Ch. 1 - A force of 10 N is applied to a cylinder of radius...Ch. 1 - A motor is supplying 50Nm of torque to its load....Ch. 1 - A ferromagnetic core is shown in Figure P1-2. The...Ch. 1 - A ferromagnetic core with a relative permeability...Ch. 1 - A two-legged core is shown in Figure P1-4. The...Ch. 1 - A core with three legs is shown in Figure P1-5....Ch. 1 - A two-legged core is shown in Figure P1-4. The...Ch. 1 - A wire is shown in Figure P1-7 that is moving in...Ch. 1 - Repeat Problem 1-10 for the wire in Figure P1-8.Ch. 1 - Prob. 1.12PCh. 1 - A core with three legs is shown in Figure P1-10....Ch. 1 - A two-legged magnetic core with an air gap is...Ch. 1 - A transformer core with an effective mean path...Ch. 1 - The core shown in Figure P1-2 has the flux shown...Ch. 1 - Prob. 1.17PCh. 1 - Prob. 1.18PCh. 1 - Prob. 1.19PCh. 1 - Demonstrate that Equation (1-59) can be derived...Ch. 1 - Prob. 1.21PCh. 1 - Prob. 1.22PCh. 1 - For the linear machine of Problem 1-22: When this...
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- What is Commutation in DC Machines? What are the methods you will suggest to improve the commutation problems?arrow_forwardWhat are the methods of excitation of the field windings of the DC machines? Draw the corresponding diagrams.arrow_forwardplease write a characteristic table showing the advantages and disadvantages of the application of all excitation dc machines. will give like!!!arrow_forward
- explain flexibility in FACTS and write the ways to achieve it. despite many advantages of dc transmission it is seldom used whyarrow_forwardWhat are the different losses taking place in a DC machine. What techniques are employed to reduce the Iron/Magnetic loss of a DC machine? Briefly state why Iron and Friction losses in a motor take place after Copper loss, whereas in generator we see the opposite order.arrow_forwardDerive the EMF and Torque equation of the DC machines from the first principles.arrow_forward
- Develop a simple Lap Windings for DC MACHINE. Provide a winding table Given: 4 Pole, Pole Pitch=9, progressive Windingsarrow_forwardWhat are the problems that may encounter in design and optimization of electric machines for high-performance applications?arrow_forwardWhy does curving the pole faces in a dc machine contribute to a smoother dc output voltage from it?arrow_forward
- a)Determine the type of DC Machine that can be utilized in a crane on the basis of the characteristics given below b) Discuss in detail the characteristics and torque requirements of the machine mentioned.arrow_forwardDC MACHINE TORQUE The armature of a dc motor has 648 conductors, 65 % of which are directly under thepole where the flux density is 48,000 lines per in2. If the core diameter is 7 inchesand its length is 4 inches and the current in each conductor is 20 A. What is thetorque exerted in the armature in N-m?arrow_forwardThe armature of a dc motor has 648 conductors, 65 % of which are directly under the pole where the flux density is 48,000 lines per in2. If the core diameter is 7 inches and its length is 4 inches and the current in each conductor is 20 A. What is the torque exerted in the armature in N-m?arrow_forward
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