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Magnetic fields can produce considerable mechanical forces. These forces can be harnessed to do work. The device that converts direct-current energy into rotating mechanical energy is a dc motor. Motors can be microscopic in size, or as big as a house. Some tiny motors are being considered for use in medical devices that can actually circulate in the bloodstream or be installed in body organs. Others can pull a train at freeway speeds. In a dc motor, the source of electricity is connected to a set of coils, producing magnetic fields. The attraction of opposite poles, and the repulsion of like poles, is switched in such a way that a constant torque, or rotational force, results. The greater the current that flows in the coils, the stronger the torque, and the more electrical energy is needed.
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8-8 At A, pictorial diagram of a simple relay. At B, schematic symbol for the same relay.
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Figure 8-9 is a simplified, cutaway drawing of a dc motor. One set of coils, called the armature coil, goes around with the motor shaft. The other set of coils, called the field coil, is stationary. The current direction is periodically reversed during each rotation by means of the commutator. This keeps the force going in the same angular direction, so the motor continues to rotate rather than oscillating back and forth. The shaft is carried along by its own inertia, so that it doesn t come to a stop during those instants when the current is being switched in polarity. Some dc motors can also be used to generate direct current. These motors contain permanent magnets in place of one of the sets of coils. When the shaft is rotated, a pulsating direct current appears across the coil.
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Magnetic fields can be used to store data in different forms. Common media for data storage include the magnetic tape, the magnetic disk, and magnetic bubble memory.
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Recording tape is the stuff you find in cassette players. It is also sometimes seen on reel-to-reel devices. These days, magnetic tape is used for home entertainment, especially hi-fi music and home video.
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8-9 Cutaway view of a dc motor.
The tape itself consists of millions of particles of iron oxide, attached to a plastic or mylar strip. A fluctuating magnetic field, produced by the recording head, polarizes these particles. As the field changes in strength next to the recording head, the tape passes by at a constant, controlled speed. This produces regions in which the iron-oxide particles are polarized in either direction (Fig. 8-10). When the tape is run at the same speed through the recorder in the playback mode, the magnetic fields around the individual particles cause a fluctuating field that is detected by the pickup head. This field has the same pattern of variations as the original field from the recording head. Magnetic tape is available in various widths and thicknesses, for different applications. The thicker tapes result in cassettes that don t play as long, but the tape is more resistant to stretching. The speed of the tape determines the fidelity of the recording. Higher speeds are preferred for music and video, and lower speeds for voice. The data on a magnetic tape can be distorted or erased by external magnetic fields. Therefore, tapes should be protected from such fields. Keep magnetic tape away from magnets. Extreme heat can also result in loss of data, and possibly even physical damage to the tape.
Magnetic disk
The age of the personal computer has seen the development of ever-more-compact data-storage systems. One of the most versatile is the magnetic disk. A magnetic disk can be either rigid or flexible. Disks are available in various sizes. Hard disks store the most data, and are generally found inside of computer units. Floppy disks or diskettes are usually either 31/2 or 51/4 inch in diameter, and can be inserted and removed from recording/playback machines called disk drives. The principle of the magnetic disk, on the micro scale, is the same as that of the magnetic tape. The information is stored in digital form; that is, there are only two different ways that the particles are magnetized. This results in almost perfect, error-free storage.
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