New design of cylindrical capacitive sensor for on-line precision control of AMB spindle

Author

Jeon, Soo ; Ahn, Hyeong-Joon ; Han, Dong-Chul ; Chang, In-Bae

Author_Institution

Sch. of Mech. & Aerosp. Eng., Seoul Nat. Univ., South Korea

Volume

50

Issue

3

fYear

2001

fDate

6/1/2001 12:00:00 AM

Firstpage

757

Lastpage

763

Abstract

A new cylindrical capacitive sensor (CCS) design for the displacement measurement of precision active magnetic bearing (AMB) spindle is presented in this paper. This research is motivated by the problem that the existing 4-segment CCS is still sensitive to the third harmonic component of the geometric errors of a rotor. The procedure of designing a new CCS starts from the modeling and error analysis of CCS. The angular size of CCS is set up as a design parameter, and a new configuration, i.e., 8-segment CCS, is introduced to possess an arbitrary angular size. The optimum sensor geometry to minimize the effects of geometric errors is determined through the minimum norm approach. Experimental results with test rotors have confirmed the improvement in geometric error suppression

Keywords

capacitive sensors; displacement control; error analysis; machine tools; magnetic bearings; AMB spindle; active magnetic bearing; angular size; cylindrical capacitive sensor; design parameter; error analysis; geometric errors; minimum norm approach; on-line precision control; sensor geometry; third harmonic component; Capacitive sensors; Carbon capture and storage; Displacement measurement; Error analysis; Magnetic levitation; Magnetic sensors; Mechanical sensors; Sensor phenomena and characterization; Sensor systems; Testing;

fLanguage

English

Journal_Title

Instrumentation and Measurement, IEEE Transactions on

Publisher

ieee

ISSN

0018-9456

Type

jour

DOI

10.1109/19.930450

Filename

930450