By Francis Bacon Crooker
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In lots of college curricula, the facility electronics box has developed past the prestige of comprising one or special-topics classes. frequently there are numerous classes facing the ability electronics box, overlaying the themes of converters, motor drives, and tool units, with in all probability extra complex classes in those components besides.
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Additional resources for The Management of Electrical Machinery
Front-Connected Double-Pole Knife Switch. stiffness and proper carrying capacity, and their contact surfaces must not be less than i square inch per 75 amperes of maxihinges and contact jaws must be good contact with the blades. The blades and jaws must be so shaped that they open along their entire length simultaneously; otherwise the arc formed upon opening a loaded circuit, will burn off the last points of contact. In fact mum current to be carried. springy enough to insure The when produced by a heavy current, is very difficult to control; so that switches should never be opened on heavily loaded In practice some form of electrocircuits except in an emergency.
Both are provided with pins, which are connected by Besides taking springs. care of differences in align- ment, a flexible coupling tends to reduce fluctuations in angular velocity due to gas or steam engines, especially if the armature is heavy or has a fly-wheel attached. An ordinary friction clutch or a magnetic clutch is a convenient FIG. ii. Flexible Shaft Coupling. means for directly coupling an engine and generator. It is easily applied, being especially designed to connect two shafts together, and has the advantage over almost any other coupling of being readily disconnected, so that one or more generators can be stopped without interfering with the engines.
Friction Drive. One of the simplest means of driving a the pulley to press against the fly-wheel of what is known as a friction engine or other mover, thus obtaining machine is to cause its 5' -AT FIG. 1 6. Single Worm roR as f> MOTOR Gear Connecting Motor and Hoisting Drum. This has the advantages of simplicity, compactness; it can be designed for any reasonable ratio of speeds, and is instantly thrown out of gear by merely moving the machine a small fraction of an inch on its sliding base. In all these respects nothing could be more desirable but friction gearing has not been very extensively drive.