Electromagnetic having magnetic shield
US5038129A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 30, 1990 |
| Grant date | Aug 6, 1991 |
| Priority date | — |
| Expiry date | Oct 30, 2010 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R33/421
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An electromagnet having a magnetic shield, in which dummy holes generally equal in shape to a hole conventionally provided for a service port are formed in a pair of end plates of a magnetic shield. The holes formed in each of the end plates are in equal radial-direction positions and are arranged in the circumferential direction at equal angular intervals, and the positions of the holes formed on the two end plates are symmetric on the center point of the electromagnet and/or the plane containing the center point and perpendicular to the center axis. Portions of the end plates in the vicinity of the holes are increased in thickness to compensate for the loss of the magnetic material due to the formation of the holes.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.