Inductance component in which a permanent magnet for applying a magnetic bias is arranged outside an excitation coil
AssigneeNEC Tokin Corporation
InventorsKazuyuki Okita, Teruhiko Fujiwara
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Abstract
In an inductance component in which a cylindrical excitation coil (26) is fitted around a predetermined portion of a magnetic core (21) forming a magnetic path, a permanent magnet (25) is inserted into the magnetic path to apply a magnetic bias to the magnetic core. The permanent magnet is arranged outside the cylindrical excitation coil. It is preferable that the permanent magnet is spaced from the predetermined portion of the magnetic core along the magnetic path at least by a distance which corresponds to ½ of an average of inner diameters of the cylindrical excitation coil.
Claims8
An inductance component comprising:
- a magnetic core forming a magnetic path;
- a cylindrical excitation coil fitted around a predetermined portion of said magnetic core;
- and
- a permanent magnet inserted into said magnetic path to apply a magnetic bias to said magnetic core, said permanent magnet being arranged outside said cylindrical excitation coil,
- wherein said permanent magnet is a rare earth permanent magnet which is made of material powder having a particle size of 150 μm or less and which has a coercive force of 398 A/m or more and a volume resistivity of 0.01 Ω·m or more.
Dependencies are inferred from the claim text.