Homework 05 - the magnetic field is 1800 rpm a What is the...

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ELEN 3441 – Fundamentals of Power Engineering Spring 2011 Page | 1 Homework 5 – Due March 25, 11 5.1. (25 pt.) Compute the speed of magnetic field rotation in AC machines having 2, 4, 6, 8, 10, 12, and 14 poles and operating at frequencies of 50, 60, and 400 Hz. Report the result in a table. Plot the speed of a 50 Hz AC machine as a function of number of poles (2 to 14 poles). 5.2. (25 pt.) A three-phase four-pole winding is installed in 12 slots on a stator. There are 40 turns of wire in each slot of the windings. All coils in each phase are connected in series, and the three phases are connected in Δ . The flux per pole in the machine is 0.060 Wb, and the speed of rotation of
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Unformatted text preview: the magnetic field is 1800 rpm. a) What is the frequency of the voltage produced in this winding? b) What are the resulting phase and terminal voltages of this stator? 5.3. (25 pt.) A three-phase Y-connected 50-Hz two-pole synchronous machine has a stator with 2000 turns of wire per phase. What rotor flux would be required to produce a terminal (line-to-line) voltage of 6 kV? 5.4. (25 pt.) If an AC machine has the rotor and stator magnetic fields shown in Figure 5-1, what is the direction of the induced torque in the machine? Is the machine acting as a motor or generator? Figure 5 ‐ 1...
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This note was uploaded on 09/21/2011 for the course EE ee taught by Professor Ee during the Spring '10 term at Istanbul Technical University.

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