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Copyright 2005 by The McGraw-Hill Companies, Inc. Click here for terms of use.
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CHAPTER 11 Inductance and Magnetism
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magnetism to create physical forces to drive our robots, we can use it to a ect the behavior of our electronic circuits.
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Electromagnets
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An electromagnet is a temporary magnet created by current in a coil of wire. Recall for a moment the perpendicular forces of magnetism, electric current, and physical force from Figs. 4-1 and 4-2. Whenever you run electricity through a wire, some magnetism is generated. Normally, though, this is not enough to be useful. If you put enough current through a wire you might get some noticeable magnetism, but increasing the current to that level is rarely practical. What you need is a way to gather a whole bunch of magnetism together, collecting it into a bundle, until it has a useful strength. A tight coil of wire creates this bundling of magnetic elds. While electrons are owing through it, the coil is a magnet with a North and a South pole and magnetic ux looping between the two (Fig. 11-1). Magnetic ux is, roughly, the stu of magnetism as de ned by how dense the magnetic eld is over a particular area of space. The magnetic eld is normally shown as lines curving through
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Fig. 11-1.
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Air-core electromagnet.
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Inductance and Magnetism
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Fig. 11-2.
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Iron-core electromagnet.
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space. The closer together the lines are, the denser the ux, and the stronger the magnetic eld at that point. While a coil of wire does a good job of creating a usable magnetic eld, adding a soft iron bar to the center of the coil means the eld will be much stronger (Fig. 11-2). In fact, an iron core can make the eld hundreds or even thousands of times stronger. The electrically induced magnetic eld causes the otherwise randomly oriented magnetic elds within the iron, known as magnetic domains, to line up and add to the strength of the coil.
NAIL ELECTROMAGNET
Try This: The usual experiment in electromagnetism is to take a large nail from the hardware store and wrap a lot of ne, insulated wire around it. Try it! Use 100 wraps or more. If you can nd lacquer-covered bell wire, that s great, or you can use the thinnest wire you can nd at the electronics shop. The more wire you use, the stronger the magnet will be. Once wrapped, hook the ends of the wire to a battery and the nail becomes a magnet. Until you remove the battery. Another reason for a long wire is resistance. The longer the wire the more resistance it has, and the better it is for the battery. Short, hot wires can be hard on both the battery and your ngers.
CHAPTER 11 Inductance and Magnetism RELAY
An electromagnet is not just good for picking up paper clips and iron lings. You can put an electromagnet inside of a switch, for example, to make an automatic switch or relay. As in all things electronic, there are schematic forms for everything. In this case, wire wrapped around a core looks like a loopy or wiggly line with a bar next to it (Fig. 11-3, left-hand relay). The symbol for the relay is an electromagnet above a switch. The electromagnet symbol is often abbreviated to a simple box with a diagonal line through it, as shown in the right-hand relay in Fig. 11-3.
MOTORS
Figure 4-2 in 4 showed the interaction of forces around a wire carrying a current. In that gure, the magnetic ux is owing into the page, the electrical current is moving from right to left, and the wire is being pushed down. Figure 11-4 illustrates the same idea showing the physical magnets. Note that the magnetic eld points from the North pole to the South pole. As current is applied to the wire it generates its own eld which interacts with the ux around it, pushing the wire up. If you make your wire into a loop and run it back and forth between the magnets, the forces push up on one side and down on the other side of the loop (Fig. 11-5), creating a turning force or torque on the wire. Finally, instead of a single wire you can create coils of wire around a soft iron core
Fig. 11-3.
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