Actuator assembly having rotary sensor responsive to rotation of magnet
US11555719B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 10, 2019 |
| Grant date | Jan 17, 2023 |
| Priority date | — |
| Expiry date | Aug 16, 2040 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02K11/215
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An actuator assembly comprises: a rotatable shaft, a magnet mounted to the rotatable shaft, non-magnet material positioned between the magnet and the shaft, a rotary sensor configured to be responsive to rotation of the magnet for generating a signal, and a housing comprising a magnetic shield surrounding at least a part of the rotary sensor and at least a part of the magnet mounted to the shaft to shield the sensor and the magnet from an external magnetic field. The actuator assembly further comprises a magnet holder fixing the magnet to the shaft. The magnetic shield encompasses the magnetic flux from the magnet to the rotary sensor and also shields the rotary sensor from any external magnetic field such as stray field or magnetic field from the outside of the housing. The non-magnetic material may reduce leakage magnetic flux from the magnet to the shaft.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.