Modular wireless linear motor
US5925943A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Mar 17, 1998 |
| Grant date | Jul 20, 1999 |
| Priority date | — |
| Expiry date | Mar 17, 2018 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02K11/00
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A path module for a linear motor, for use with a linear motor stage, includes switching sensors and encoder sensors. The switching sensors energize only those armature windings that are within the magnetic influence of the linear motor stage. The stage carries an encoder magnet having magnetic zones of alternating polarity. The encoder magnet has a length D. An encoder sensor in one path module is separated from its nearest counterpart in an adjacent path module by no more than the distance D. In the preferred embodiment, each path module has three encoder sensors spaced D/2 apart, and the outer ones of the three encoder sensors are spaced D/4 from their mating ends, whereby, when adjacent path modules are assembled, closest encoder sensors in adjacent modules are spaced D/2 apart.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.