Electricity: measuring and testing – Magnetic – Displacement
Patent
1986-08-14
1988-04-12
Strecker, Gerard R.
Electricity: measuring and testing
Magnetic
Displacement
324226, 336200, 336232, 415118, G01B 714, H01F 1700, H01F 2728, G01R 3300
Patent
active
047377097
ABSTRACT:
A device for detecting axial movement of a rotating member, for example a compressor rotor of a gas turbine engine, comprises a conducting wire spaced radially from the rotating member, and a magnet carried by the rotating member passes in proximity to the conducting wire when the rotating member is rotating. The conducting wire has a first limb a second limb and a third limb extending with axial and circumferential components, the first and third limbs extending in the circumferentially opposite direction to the second limb to increase resolution between pulsed e.m.f.'s produced when the magnet crosses the limbs. The first, second and third limbs are each formed from a pair of parallel connected bars to produce positive and negative pulsed e.m.f.'s which form zero crossing points which are more easily detected. This enables operation at greater radial clearance or lower rotating speeds.
REFERENCES:
patent: 3208269 (1965-09-01), Eccles et al.
Staheli W., Inductive Method for Measuring Rotor Blade Vibrations on Turbo-machines, Sulzer Technical Revue, vol. 57, No. 3, pp. 177-185, 1975.
Rolls-Royce plc
Strecker Gerard R.
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