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Powdered-iron and ferrite cores
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Ferromagnetic substances can be crushed into dust and then bound into various shapes, providing core materials that greatly increase the inductance of a coil having a given number of turns. Depending on the mixture used, the increase in flux density can range from a factor of a few times, up through hundreds, thousands, and even millions of times. A small coil can thus be made to have a large inductance. Powdered-iron cores are common at radio frequencies. Ferrite has a higher permeability than powdered iron, causing a greater concentration of magnetic flux lines within the coil. Ferrite is used at lower radio frequencies and at audio frequencies, as well as at medium and high radio frequencies. The main trouble with ferromagnetic cores is that, if the coil carries more than a certain amount of current, the core will saturate. This means that the ferromagnetic material is holding as much flux as it possibly can. Any further increase in coil current will not produce a corresponding increase in the magnetic flux in the core. The result is that the inductance changes, decreasing with coil currents that are more than the critical value. In extreme cases, ferromagnetic cores can waste considerable power as heat. If a core gets hot enough, it might fracture. This will permanently change the inductance of the coil, and will also reduce its current-handling ability.
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Permeability tuning
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Solenoidal, or cylindrical, coils can be made to have variable inductance by sliding ferromagnetic cores in and out of them. This is a common practice in radio communications. The frequency of a radio circuit can be adjusted in this way, as you ll learn later in this book. Because moving the core in and out changes the effective permeability within a coil of wire, this method of tuning is called permeability tuning. The in/out motion can be precisely controlled by attaching the core to a screw shaft, and anchoring a nut at one end of the coil (Fig. 10-7). As the screw shaft is rotated clockwise, the core enters the coil, so that the inductance increases. As the screw shaft is rotated counterclockwise, the core moves out of the coil and the inductance decreases.
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Toroids
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Inductor coils do not have to be wound on cylindrical forms, or on cylindrical ferromagnetic cores. In recent years, a new form of coil has become increasingly common. This is the toroid. It gets its name from the donut shape of the ferromagnetic core. The coil is wound over a core having this shape (Fig. 10-8).
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Toroids 191
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10-7 Permeability tuning of a solenoidal coil.
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10-8 A toroidal coil winding.
There are several advantages to toroidal coils over solenoidal, or cylindrical, ones. First, fewer turns of wire are needed to get a certain inductance with a toroid, as compared with a solenoid. Second, a toroid can be physically smaller for a given inductance and current-carrying capacity. Third, and perhaps most important, essentially all of the flux in a toroidal inductor is contained within the core material. This reduces unwanted mutual inductances with components near the toroid. There are some disadvantages, or limitations in the flexibifity, of toroidal coils. It is more difficult to permeability-tune a toroidal coil than it is to tune a solenoidal one. It s been done, but the hardware is cumbersome. Toroidal coils are harder to wind than solenoidal ones. Sometimes, mutual inductance between or among physically separate coils is wanted; with a toroid, the coils have to be wound on the same form for this to be possible.
192 Inductance
Pot cores
There is another way to confine the magnetic flux in a coil so that unwanted mutual inductance does not occur. This is to extend a solenoidal core completely around the outside of the coil, making the core into a shell (Fig. 10-9). This is known as a pot core. Whereas in most inductors the coil is wound around the form, in a pot core the form is wrapped around the coil.
10-9
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