Inductors Wound on Magnetic-Cored Rings, Slugs, Tubes and SleevesAuthor: R.J.Edwards G4FGQ © 18th December 1997
Inductor core shapes may be generally described as cylindrical with a hole through the centre. When the length of the cylinder is long compared with its diameter we have a tube or sleeve. When the length is roughly equal to the diameter we have a slug. When the length is small compared with the diameter we have a ring with a rectangular or square cross-section limb. Very short lengths form washers. The most often used shape is the ring with a square cross-section. Tubes generally have a wall thickness the same as the hole diameter.
All are covered by three measurements: external diameter, internal (hole) diameter and the length (or height). This program requires dimensions in milli-metres.
Core materials are:
- A composition of iron dust and an insulating material in varying proportions to give a permeability of 5 to 50. These have linear and low HF loss characteristics.
- Ferrites with permeabilities 100 to 2000 which are less linear and have sharp saturation characteristics. HF loss tends to increase with permeability.
- Electrical steels and alloys have permeabilities up to 10,000 with high hysteresis and eddy-current loss above audio frequencies. Laminated cores are formed by a winding of very thin steel tape.
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