Combined position sensor and magnetic motor or bearing
US4652820A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Mar 23, 1983 |
| Grant date | Mar 24, 1987 |
| Priority date | — |
| Expiry date | Mar 23, 2003 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16C32/0459
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A combined magnetic sensor and actuator device for applying a magnetic force to a magnetizable body and for sensing the distance between the device and the magnetizable body. The device includes a magnetizable pole piece separated from the magnetizable body by gaps. The pole piece, gaps, and magnetizable body form a magnetic circuit with the gaps preferably being the major reluctance of the circuit. Separate means are provided for generating a relatively large time-varying magnetic actuating flux in the magnetic circuit and for generating a relatively small time-varying magnetic sensing flux in the magnetic circuit. Each magnetic flux follows a flux path, such that the two flux paths have at least a portion in common. Detection means measure the relatively small magnetic flux in the magnetic circuit, and thereby measure the distance between the device and the magnetizable body.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.