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Consider the full-wave rectifier system of Figure with R = 500 Consider the full-wave rectifier system of Figure with R = 500 fl and C = 200ÂľF. Assume each diode to have a constant voltage drop of 0.7 V when it is ON but to be otherwise ideal. For a 220 V rms, 50 Hz […]

Consider Example 10.12 in which a current-source inverter is dri Consider the stepped voltage waveform of Problem 10.18 and Figure. a. Using Fourier analysis, find the value of D (0 < d=””>< 0.5)=”” such=”” that=”” the=”” amplitude=”” of=”” the=”” third=”” harmonic=”” component=”” of=”” the=”” voltage=”” waveform=”” is=””> b. Use the MATLAB ‘fit ( )’ function […]

Measurements on a small permanent-magnet dc motor indicate Measurements on a small permanent-magnet dc motor indicate that it has an armature resistance of 4.6O. With an applied armature voltage of 5 V, the motor is observed to achieve a no-load speed of 11,210r/min while drawing an armature current of 12.5 mA. a. Calculate the motor […]

In Section 8.2, when discussing Figure, the text states: In Section 8.2, when discussing Figure, the text states: “In addition to the fact that there are not positions of simultaneous alignment for the 6/4 VRM, it can be seen that there also are no rotor positions at which only a torque of a single sign […]

In a balanced two-phase machine, the two windings are displaced In a balanced two-phase machine, the two windings are displaced 90 electrical degrees in space, and the currents in the two windings are phase-displaced 90 electrical degrees in time. For such a machine, carry out the process leading to an equation for the rotating mmf […]

In the paragraph preceding Equation 8.1, the text states that In the paragraph preceding Equation 8.1, the text states that “under the assumption of negligible iron reluctance the mutual inductances between the phases of the doubly-salient VRM of Figure b will be zero, with the exception of a small, essentially constant component associated with leakage […]

In order to test the properties of a sample of In order to test the properties of a sample of electrical steel, a set of laminations of the form of figure have been stamped out of a sheet of the electrical steel of thickness 3.0 mm. The radii of the laminations are Ri = 75 […]

The reciprocating generator of Figure has a movable plunger+ The reciprocating generator of Figure has a movable plunger (position x) which is supported so that it can slide in and out of the magnetic yoke while maintaining a constant air gap of length g on each side adjacent to the yoke. Both the yoke and […]

If the synchronous motor of Problem 5.30 is now operated+ If the synchronous motor of Problem 5.30 is now operated as a synchronous generator connected to an infinite bus of rated voltage, find the minimum per-unit field excitation (where 1.0 per unit is the field current required to achieve rated open-circuit voltage) for which the […]

The rotor of a six-pole synchronous generator is rotating at+ The rotor of a six-pole synchronous generator is rotating at a mechanical speed of 1200 r/min. a. Express this mechanical speed in radians per second. b. What is the frequency of the generated voltage in hertz and in radians per second? c. What mechanical speed […]