Limited-rotation motor with integral displacement transducer
US4189699A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | May 17, 1978 |
| Grant date | Feb 19, 1980 |
| Priority date | — |
| Expiry date | May 17, 1998 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01F2029/143
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
The armature of a limited-rotation motor which rotates about an axis relative to a stator is extended axially beyond the stator between arcuate, non-magnetic capacitor plates disposed in a cylindrical array coaxial with the rotation axis. The capacitor plates are connected in a bridge circuit whose output is a selected function of armature displacement. The capacitor plates are installed at the end of the motor stator during assembly of the motor as tines of a unitary slotted bushing that is reamed simultaneously with the motor stator, following which the bushing is circumferentially cut to electrically isolate the bushing tines to form the individual plates.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.