Hybrid encoder system for position determination
US10480961B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 5, 2018 |
| Grant date | Nov 19, 2019 |
| Priority date | — |
| Expiry date | May 3, 2038 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01D2205/771
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A linear and curvilinear encoder is provided in which absolute mechanical position and high resolution position determination can be obtained using a cart having a mover with “hybrid” teeth, configured in a curvilinear profile or shape, moving along a curvilinear track with a stator having teeth. The absolute mechanical position and high resolution position determination can be detected on the track by applying an excitation signal to a coil surrounding particular teeth of the stator to produce an electromagnetic (EM) field which can be influenced by the profile or shape of the teeth of the mover. A resulting pick-up signal can then be detected in a pick-up coil surrounding particular teeth of the stator with different harmonics in the pick-up signal corresponding to harmonics of the profile or shape of the teeth.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.