Encapsulated magnet assembly and method for making the same
US6380833B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 7, 1999 |
| Grant date | Apr 30, 2002 |
| Priority date | — |
| Expiry date | Apr 7, 2019 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01F7/0221
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
An encapsulated magnet assembly comprises a non-metallic housing and a magnet disposed within a housing magnet chamber. A housing end cap is fuse bonded to the housing to encapsulate the magnet therein and form an air and fluid-tight seal with the housing. An insulating spacer is interposed between an exposed surface of the magnet and the end cap before assembly and fuse bonding, and is formed from a thermally insulating material to prevent the transmission of thermal energy to the magnet during the fuse bonding process. The insulating spacer serves to protect the magnet from unwanted thermally induced magnetic field losses. The housing also includes one or more projections that extend into the magnet chamber and that cooperate with complementary grooves in the magnet to prevent the magnet from rotating within the chamber.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.