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Solve using data from the DC machine data sheet, using the "hot" resistance value for all calculations. Note that the value of K on the sheet is for rated (100%) field flux. Assume that the machine can safely handle as much current as the power converter can deliver to it. In addition, assume that all power semiconductors are ideal with zero voltage drop when they are on.
1. Consider a 2 hp, 850 rpm dc machine connected to a single-phase, fully-controlled thyristor bridge as shown in Fig. 2.9-4 (pg. 53), assuming that the series inductance is large enough to justify the assumption of infinite output inductance. The amplitude of the ac voltage source is 210 Vrms, the maximum thyristor current is 10 A and the phase control angle α can be varied over the full range from 0 to π rad. Assume that the maximum machine speed is 2000 rpm in either direction (i.e., ± 209.4 rad/s).
a) Plot the complete boundary envelope (i.e., capability curve) of the drive system's torque-speed operating capabilities on a set of T-ω axes, with torque T on the y-axis [in N-m] and speed ω on the x-axis [in rad/s]. Assume that the field flux is constant at its rated (100%) value. In addition, assume that the maximum armature current is determined by the maximum thyristor current rather than the rated machine current based on its rated power. Similarly, assume that the maximum applied armature voltage amplitude is determined by the maximum positive and negative rectifier output voltage (@α = 0 and α = π) rather than the rated machine voltage. What are the torque, speed, machine shaft power, and phase control angle α at the four corners of the operating envelope?
The circuit shown below is a prototype 4 th - order low-pass filter which is required to meet the specification given. However the specification is not met due to inadequate atten
Discuss mode -2 (bi-directional mode) of 8255 (Programmable Peripheral Interface). Only permitted with port A. Bi-directional bus data used for interfacing two computers and GP
defination and working ?
reading type of cro probe
This is basically a simple senior design project where the professors are giving us a limited budget and providing us with an Arduino Board. (We can use rasberry pi, beagle bone, e
Suppose we have a coil wound onto a ring of material with relative permeability µ r . Provided that the relative permeability µ r >> 1, then the magnetic flux lines will s
Q. Amicrowave relay systemuses two identical horn antennas mounted on towers spaced 40 km apart. If f c = 6 GHz, and each relay hop has L = 60 dB, calculate the antenna aperture a
The method by which electrical signals convey information has been described. Systems components have been selected and interfaced to enable a chosen system to perform a desired o
Explain junction transistors (npn and pnp). Junction Transistor: This transistor consists of two p-n junctions combined in one crystal as demonstrated in figure below.
Q. A source of impedance ¯ Z S = R S = 100 has an open-circuit voltage v S (t) = 12.5 cos ωot and drives a 75- transmission line terminated with a 75- load. Find the current
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