Patent · US Active

Axial displacement and rotational speed monitoring

US9423233B2 · kind B2 · utility

5Cited by

7References

16Claims

0Family size

Assignee

ROLLS-ROYCE plc

Inventors

Jonathan E. Holt · Bellingham, US
Stephen Granville Garner · Ashby de la Zouch, GB
Mark J. E. Bellis · Derby, GB

Key dates

Filing date	Jun 14, 2011
Grant date	Aug 23, 2016
Priority date	—
Expiry date	Sep 24, 2033

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY02T50/60
WIPO fieldMeasurement
WIPO sectorInstruments

Abstract

An apparatus, for example for a pitch change mechanism, includes a cylinder having a magnetic portion defining an annular array of features extending parallel to the longitudinal axis of the cylinder, the cylinder rotating in use and able to translate longitudinally. There is a sensing arrangement including a stationary magnetised core and two coils connected in series and wound around the core. In use, the cylinder rotates and current is induced in the coils. Monitoring equipment is arranged to calculate rotational speed of the cylinder from the frequency of the current and to calculate longitudinal position from the relative amplitude of the current in each coil. Also a method.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.