Design of a Linear Variable Differential Transformer With High Rejection to External Interfering Magnetic Field

被引：60

作者：

Martino, M. ^{[1
,2
]}

Danisi, A. ^{[1
,3
]}

Losito, R. ^{[1
]}

Masi, A. ^{[1
]}

Spiezia, G. ^{[1
]}

机构：

[1] CERN, EN STI Grp, CH-1211 Geneva, Switzerland

[2] Univ Naples Federico II, Dept Elect Engn, I-80138 Naples, Italy

[3] Univ Naples Federico II, Dept Elect & Telecommun Engn, I-80138 Naples, Italy

来源：

IEEE TRANSACTIONS ON MAGNETICS | 2010年 / 46卷 / 02期

关键词：

Linear Variable Differential Transformer (LVDT); magnetic interference; magnetic shielding; LHC COLLIMATORS; LVDT; EXCITATION;

D O I：

10.1109/TMAG.2009.2033341

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

0808 ; 0809 ;

摘要：

The sensitivity of linear variable differential transformer (LVDT) position sensors to external slowly varying magnetic fields represents a critical issue when these sensors are installed close to high-current cables or electrical motors with significant fringe fields. The resulting position error can reach several hundreds of micrometers against a specified uncertainty normally below a few micrometers. In this paper, the design of a LVDT position sensor with high rejection to external constant or slowly varying magnetic fields is addressed by exploiting the finite element method (FEM) simulator FLUX. A shield, isolated from the sensor's magnetic circuit, has been considered to reduce the effect of magnetic fields on the secondary voltages of the LVDT. In addition, a dc current is used in order to polarize the magnetic circuit to reduce the sensitivity of the sensor to external interferences.

引用

页码：674 / 677

页数：4

共 20 条

[1] DIFFERENTIAL TRANSFORMER WITH TEMPERATURE AND EXCITATION-INDEPENDENT OUTPUT [J].

ARA, K .

IEEE TRANSACTIONS ON INSTRUMENTATION AND MEASUREMENT, 1972, IM21 (03) :249-&

[2]

*ASM INT, 1990, MET HDB, V1

[3]

BOZORTH R, 1951, FERROMAGNETISM, P130

[4] Application of an FFT-based algorithm to signal processing of LVDT position sensors [J].

Crescini, D ;

Flammini, A ;

Marioli, D ;

Taroni, A .

IEEE TRANSACTIONS ON INSTRUMENTATION AND MEASUREMENT, 1998, 47 (05) :1119-1123

[5]

Danisi A., 2009, THESIS U FEDERICO II

[6]

Hoselitz K., 1952, FERROMAGNETIC PROPER, P238

[7] AN ANALYTIC MODEL FOR FLUXGATE MAGNETOMETER [J].

MARSHALL, SV .

IEEE TRANSACTIONS ON MAGNETICS, 1967, MAG3 (03) :459-&

[8]

MARTINO M, 2009, CHARACTERIZATI UNPUB

[9] LHC collimators low level control system [J].

Masi, Alessandro ;

Losito, Roberto .

IEEE TRANSACTIONS ON NUCLEAR SCIENCE, 2008, 55 (01) :333-340

[10] LVDT conditioning on the LHC collimators [J].

Masi, Alessandro ;

Brielmann, Arnaud ;

Losito, Roberto ;

Martino, Michele .

IEEE TRANSACTIONS ON NUCLEAR SCIENCE, 2008, 55 (01) :67-75

← 1 2 →