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Position sensor for active magnetic bearing with commercial linear optical encoders

Tantau, M; Morantz, P; Shore, P (2001) Position sensor for active magnetic bearing with commercial linear optical encoders. CIRP Annals, 70 (1). pp. 419-422.

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Abstract

Active magnetic bearings are used in a number of applications but their disadvantage is the high asynchronous error due to sensor noise amplification. In this paper a new radial position sensor for active magnetic bearings (AMB) based on linear optical encoders is presented. A commercial encoder scanning head faces a round scale with concentric, coplanar lines on its face. Because such a scale is not readily available, it is made by high precision micro machining and different options are compared. In experiments a measurement noise of 3.5 nm at 10 kHz bandwidth is achieved. In addition, a magnetic bearing is built to demonstrate the sensor in closed-loop.

Item Type: Article
Subjects: Engineering Measurements > Dimensional
Divisions: Engineering
Identification number/DOI: 10.1016/j.cirp.2021.04.092
Last Modified: 27 Apr 2022 13:34
URI: http://eprintspublications.npl.co.uk/id/eprint/9425

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