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I need to use one of those for an experiment (a solenoid with the shape of a torus). Unfortunately, as you can see, I don't know the appropriate name for it. I have built myself a temporary one but I'd much rather buy an industrial-made one to be certain about it's efficiency, and for that I need the name. Here is a picture of one that I made:

enter image description here

PeterJ
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Hadron
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  • Unpload the photo somewhere publically accessible and post a link here as a comment and someone can edit to include in your question. – PeterJ Aug 18 '13 at 10:02
  • http://www.flickr.com/photos/100405825@N05/9534678061/ – Hadron Aug 18 '13 at 10:08

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A solenoid is a type of actuator; what your picture shows is a toroidal inductor. And don't worry too much about getting a premade one; unless you have high-volume or high-precision needs, self-wound ones are fine if you know the specs of the toroid.

Ignacio Vazquez-Abrams
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