Patent · US Expired

Compressed soft magnetic materials

US6419877B1 · kind B1 · utility

3Cited by

5References

20Claims

0Family size

Assignee

Höganäs AB · SE

Inventors

Cecilia Elgelid · Helsingborg, SE
Anne Larsson-Westberg · Helsingborg, SE
Lars-Ake Larsson · Lund, SE

Key dates

Filing date	Mar 12, 2001
Grant date	Jul 16, 2002
Priority date	—
Expiry date	Mar 12, 2021

Classification

Technology area (CPC B)Performing Operations; Transporting
CPC primaryB22F2998/10
WIPO fieldElectrical machinery, apparatus, energy
WIPO sectorElectrical engineering

Abstract

The invention concerns a process for the preparation of a compressed soft magnetic powder core comprising the steps of compacting an iron based powder the particles of which are insulated by a chromium containing layer, at a pressure between 300 and 1500 Mpa. The compacted body is then heated to a temperature sufficient for achieving stress relief and recrystallization of the iron base material.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.