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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- Determine the magnetic flux (per pole) in a 100-V, 780 watts, PM motor operating at a speed of 1500 rpm. The motor constant is 88, the armature resistance is 0.7 Ω, and the rotational losses are (50) Warrow_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
- Q25) 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_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_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
- What is the concept of the magnetic circuit? Give examples of AC analysis of magnetic circuits .arrow_forwardElectromagnetic circuit boardarrow_forwardThe total conductor in the grooves of the DA in the figure is 1440 conductors, the length of the armature is 30 cm.The magnetic flux of a pole is 0.8 tesla and the armature rotates at 4 m / s. Find the voltage value produced by the armature according to the position in the figure.arrow_forward
- A permanent magnet dc motor has a rotor radius of 1.3 cm, magnetic thickness of 0.25cm, and a gap length of 0.05 cm. The magnetic flux density in the motor is,arrow_forwardA 4 pole armature of a DC machine has 175 conductors and a flux per pole of 0.1 wb. Find the EMF generated when running at 600 rpm, when the armature is Lap wound.arrow_forwardWhat characteristic is desirable in the B–H curve for a prospective material to be used in a permanent magnet? In a motor or transformer? Explain.arrow_forward
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