A six-pole, 60-Hz synchronous machine has a rotor winding with A six-pole, 60-Hz synchronous machine has a rotor winding with a total of 138 series turns and a winding factor kr = 0.935. The rotor length is 1.97 m, the rotor radius is 58 cm, and the air-gap length = 3.15 cm. a. What is […]
Repeat Problem 3.4, assuming that the inductor is connected Repeat Problem 3.4, assuming that the inductor is connected to a voltage source which increases from 0 to 0.4 V (part [a]) and then is held constant at 0.4 V (part [b]). For both calculations, assume that all electric transients can be ignored.
Repeat Example 8.3 under the condition that the rotor speed Repeat Example 8.3 under the condition that the rotor speed is 4500 r/min and that a negative voltage of -250 V is used to turn off the phase current.
Repeat Problem 10.1 assuming the diode to have a fixed Repeat Problem 10.1 assuming the diode to have a fixed 0.6 V voltage drop when it is ON but to be otherwise ideal. In addition, calculate the time-averaged power dissipation in the diode.
Repeat Problem 5.24 assuming that the saturated direct-axis sync Repeat Problem 5.24 assuming that the saturated direct-axis synchronous inductance Xd is equal to that found in Problem 5.15 and that the saturated quadrature-axis synchronous reactance Xq is equal to 75 percent of this value. Compare your answers to those found in Problem 5.24.
Repeat Example 8.1 for a machine identical to that considered Repeat Example 8.1 for a machine identical to that considered in the example except that the stator pole-face angle is β = 45Â
The magnetic circuit of figure consists of a core and a The magnetic circuit of figure consists of a core and a moveable plunger of width lp, each of permeability µ. The core has cross-sectional area A and means length Ac. The overlap area of the two air gaps Ag is a function of the […]
The nameplate of a dc generator indicates that it will The nameplate of a dc generator indicates that it will produce an output voltage of 24 V dc when operated at a speed of 1200 r/min. By what factor must the number of armature turns be changed such that, for the same field-flux per pole, […]
Repeat Example 5.9 assuming the generator is operating at one-ha Repeat Example 5.9 assuming the generator is operating at one-half of its rated kVA at a lagging power factor of 0.8 and rated terminal voltage.
Neglecting any effects of rotational and core losses, use MATLAB Neglecting any effects of rotational and core losses, use MATLAB to plot the internal torque versus speed curve for the induction motor of Problem 6.10 for rated-voltage, rated-frequency operation. On the same plot, plot curves of internal torque versus speed for this motor assuming the […]