Annealed polymer-bonded soft magnetic body
US5595609A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Nov 24, 1995 |
| Grant date | Jan 21, 1997 |
| Priority date | — |
| Expiry date | Nov 24, 2015 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01F1/26
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A method for stress relieving a compression molded magnetic body is provided for purposes of enhancing the magnetic permeability of the magnetic body. The method involves encapsulating ferromagnetic particles with a thermoplastic polymer coating selected from the group consisting of polybenzimidazole and polyimides having heat deflection temperatures of at least about 400.degree. C. which are capable of withstanding elevated temperatures for a duration which is sufficient to anneal the magnetic body formed from the coated metal particles. As a result, the stresses induced in the magnetic core by the compression molding process can be relieved without detriment to the mechanical properties and magnetic characteristics of the magnetic core.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.