Adjustable air gap ferrite structures and methods of manufacture
US4523170A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Nov 5, 1982 |
| Grant date | Jun 11, 1985 |
| Priority date | — |
| Expiry date | Nov 5, 2002 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T29/49076
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
New fabricating methods and products are disclosed for manufacture and assembly of tunable-inductance magnetically-soft ferrite core assemblies. Pot core type elements are pressure molded from ferrimagnetic particles having residual reactivity; unitary helical threads are tapped in central openings of compacted core elements while in the green state; subsequent heat treatment converts the green compact to a ceramic. Use of a shrink tap provides compatibility of the unitary threads with the pre-threaded male adjustment members of the prior practice. A new assembly enables use of identical core half sections; provision is made for support at one or both longitudinal ends of the male tuning member.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.