REET 425 WEEK 4 HOMEWORK / ELECTRIC MACHINES AND POWER SYSTEMS WITH LAB
REET 425 Week 4 Homework Answers (DeVry)
3–1.What is the principal difference between a synchronous machine and an inductionmachine?
3–2.Why does switching the current flows in any two phases reverse the direction of rotation of a stator’s magnetic field?
3–3.What is the relationship between electrical frequency and magnetic field speed foran ac machine?
3–7.Modify the MATLAB in Example 3–1 by swapping the currents flowing in any twophases. What happens to the resulting net magnetic field?
3–3.The first ac power system in the United States ran at a frequency of 133 Hz. If theac power for this system were produced by a four-pole generator, how fast would the shaft of the generator have to rotate?
3–8.If an ac machine has the rotor and stator magnetic fields shown in Figure P3–1, what is the direction of the induced torque in the machine? Is the machine acting as a motor or generator?
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