Electric machinery fundamentals
5th Edition
ISBN: 9780073529547
Author: Chapman, Stephen J.
Publisher: MCGRAW-HILL HIGHER EDUCATION
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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.
What is commutation in DC Machine? What are the methods you will suggest to improve the commutation problem?
Derive the EMF and Torque equations of DC machines from the first principles.
Chapter 1 Solutions
Electric machinery 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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