How do Toroids work, and What are they used for?


by Triangulum
Tags: electric fields, induced current, magnetism, solenoids, toroid
Triangulum
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#1
May9-09, 12:28 PM
P: 12
How do Toroids (inductors) work, and What are they used for (in electronics and/or other physics applications)?

Thanks
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deferro
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#2
May9-09, 01:19 PM
P: 49
They're used for lots of things: washers, bangles, rings on fingers; it's just a shape, like 'square' is.
Dadface
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#3
May9-09, 01:35 PM
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Quote Quote by Triangulum View Post
How do Toroids work, and What are they used for?

Thanks
Are you thinking of toroidal magnets?

Triangulum
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#4
May9-09, 02:46 PM
P: 12

How do Toroids work, and What are they used for?


Sorry for not specifying, but I meant Toroids as in the electricity and magnetism part of physics, such as an inductor or a "round solenoid."

Thanks
deferro
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#5
May9-09, 08:13 PM
P: 49
A toroidal ferrite core with wire wound on it is called a choke in EE.
Try wikipedia (and an old PC power supply); do you understand induction?
Triangulum
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#6
May9-09, 08:46 PM
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I understand induction, but I can't think of any real-life applications of when a toroid would be useful.
deferro
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#7
May9-09, 08:55 PM
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Hmm, well, choke coils are fairly ubiquitous, see what a choke does and see if it looks useful.
mgb_phys
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#8
May9-09, 09:27 PM
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Quote Quote by Triangulum View Post
I understand induction, but I can't think of any real-life applications of when a toroid would be useful.
An inductor blocks transmission of a fast changing signal such as external interference on a wire.
They are normally only called chokes when they are inductors in circuit.
Phrak
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#9
May9-09, 09:54 PM
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It depends on the application, and frequency domain where the material can be powdered iron, or wound soft steel tape, or ferrite.

In small, bead form, on a wire, torroids block noise. Toroidal cores are even used in 60Hz transformers where a low profile is a requirement. Current transformers, antenna balums, and line filters are some uses. Way back when, square BH core material toroids were used to store data bits (core memory).

Packaged with a couple capacitors, or used discretely, they are commonly used as line filters.


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