Sliding means with built-in moving-magnet linear motor
US6573623B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 22, 2001 |
| Grant date | Jun 3, 2003 |
| Priority date | — |
| Expiry date | Aug 3, 2021 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02K29/08
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A sliding means with built-in moving-magnet linear is disclosed, which makes it possible to sense accurately a table position with a magnetic sensor element. To this end, a magnetic flux pattern is rectified outside any one N-pole of forward and aft end poles of a field magnet. Position of the table is monitored with a magnetic sensor element arranged on the bed in opposition to the field magnet. Arranged outside the end pole of the field magnet is an auxiliary magnet unlike in polarity and made as small as possible in effect on propulsion exerted on the table. The auxiliary magnet is to rectify the magnetic flux pattern outside the end pole of the field magnet to the same distribution pattern as found at a boundary between the adjacent poles opposite in polarity in the field magnet, thus making it possible to identify the accurate positions of the forward and aft end pole of the field magnet.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.