Power inductor and transformer with low acoustic noise air gap

Details Power inductor and transformer with low acoustic noise air gap Power inductor and transformer with low acoustic noise air gap

1976-05-19

1977-09-06

Kozma, Thomas J.

Inductor devices

With vibration control

336178, 336212, H01F 2724

Patent

active

040471381

ABSTRACT:
A ferrite magnetic core includes a one-piece rectangular outer member with aligned circular apertures in which the ends of a cylindrical center member are retained to thus establish a radial air gap. Radial magnetic forces acting on the core members are summed to zero to theoretically eliminate movement and result in low acoustic noise in high operating frequency power inductors and transformers. A magnetic bridge is added to reduce air gap fringing flux outside the core. Other modifications and a "C" core configuration are described.

REFERENCES:
patent: 416762 (1889-12-01), Thomson
patent: 1699506 (1929-01-01), Faus
patent: 2030648 (1936-02-01), Meissner
patent: 2500748 (1950-03-01), Grant
patent: 2513160 (1950-06-01), Friend
patent: 2722664 (1955-11-01), Duncan et al.
patent: 3187208 (1965-06-01), Van de Graaff
patent: 3209295 (1965-09-01), Baermann

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