Inductors Wound on Magnetic-Cored Rings, Slugs, Tubes and Sleeves

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:

1. 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.
2. Ferrites with permeabilities 100 to 2000 which are less linear and have sharp saturation characteristics. HF loss tends to increase with permeability.
3. 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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