Electric machinery fundamentals
5th Edition
ISBN: 9780073529547
Author: Chapman, Stephen J.
Publisher: MCGRAW-HILL HIGHER EDUCATION
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Chapter 3, Problem 3.2P
To determine
The table representing the speed of the given ac machines with different supply frequencies and the number of poles.
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Chapter 3 Solutions
Electric machinery fundamentals
Ch. 3 - What is the principal difference between a...Ch. 3 - Prob. 3.2QCh. 3 - Prob. 3.3QCh. 3 - What is the equation for the induced torque in an...Ch. 3 - The simple loop rotating in a uniform magnetic...Ch. 3 - Prob. 3.2PCh. 3 - The first ac power system in the United States ran...Ch. 3 - A three-phase, Y-connected, four-pole winding is...Ch. 3 - A three-phase, -connected, six-pole winding is...Ch. 3 - A three-phase, Y-connected, 60 Hz, two-pole...
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- A magnetic circuit with a cross-sectional area of 20 cm? is to be operated at 50 Hz from a 120 V rms supply. The number of turns required to achieve a peak magnetic flux density of 1.8 T in the core isarrow_forward1.72 At 1200 rpm the induced emf of a dc machine is 200 V. For an armature current of 15 A the electromagnetic torque produced would be (a) 23.8 N-m (c) 2000 N-m (b) 238 N-m (d) 3000 N-marrow_forwardDevelop a table showing the speed of magnetic field rotation in ac machine of 2, 4, 6, 8, 10, 12, and 14 polesoperating at frequencies of 50, 60, and 400 Hz.arrow_forward
- no more than 50 words. How would you reverse the polarity of a self-excited DC generator?arrow_forwardDetermine the power output of a DC armature having 1152 lap connected conductors carrying 150 A and rotating at 300 rpm in a 12 pole field. The flux per pole is 60 mwb.arrow_forwardA lap-winding DC machine has 24 coils, 18 turns per coil, and 4 poles. The average flux density per pole is 1T. The effective length is 40 cm and the armature radius is 10 cm. The armature velocity is 140.2 rad/sec and the armature current is 24 A. The average flux per pole in Wb is: 6.283 0.06283 O 0.6283 0.006283arrow_forward
- × 4:03 K s.eng.ruh.ac.lk □ Û 8. Figure 4 shows the core of a simple dc motor. The magnetization curve for the metal in this core is given by Figure 5 and Figure 6. Assume that the cross-sectional area of each air gap is 18 cm² and that the width of each air gap is 0.05 cm. The effective diameter of the rotor core is 4 cm. L It is desired to build a machine with as great a flux density as possible while avoiding excessive saturation in the core. What would be a reasonable maximum flux density for this core? ii. What would be the total flux in the core at the flux density of part (i)? iii. The maximum possible field current for this machine is I A. Select a reasonable number of turns of wire to provide the desired flux density while not exceeding the maximum available current. Flux Density, B (T) 2.8 སྤྲ ཤཱ ཀ ཀཱ བྷ ཀ ཡཱཾ བ ་ 1.2 1.0 0.4 0.2 4-48cm Figure 4 0 10 20 30 40 50 100 → Depth 4 cm -0.05 cm 200 300 500 1000 2000 Magnetizing Intensity, H (A.turns/m) Figure 5 Magnetization curve…arrow_forwardQ25) i) What are the factors that the induced voltage in three phase induction motor depends upon and Explain how the rotating magnetic field is produced in the three phase induction motor.arrow_forwardThe interpoles in DC machines are: O a. Used to maintain constant magnetic flux O b. Used to increase the cost of the machine O c. Used to maintain the speed of rotation O d. Used to reduce the sparksarrow_forward
- An 4 pole, wave connected armature has 520 conductors and its generated e.m.f is 115 V. If the machine is driven at 600 rpm, then the flux per pole in Wb isarrow_forwardWrite an article describing the DC Generator. Provide applications of DC generator. Provide the importance of a DC generatorarrow_forwardIn a DC motor, why forces are generated for parts of the loop and not for other parts of the loop. The Force equation with sin theta ( max force when theta is 90 degrees or perpendicular to magnetic field lines.)arrow_forward
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