Hardware control of an active magnetic shield

Author

Sergeant, P. ; Van den Bossche, A. ; Dupré, L.

Author_Institution

Dept. of Electr. Energy, Ghent Univ., Syst. And Autom.

Volume

1

Issue

3

fYear

2007

fDate

5/1/2007 12:00:00 AM

Firstpage

152

Lastpage

159

Abstract

The presented hardware controller controls the current in an active shield consisting of a number of compensation coils at well-chosen positions. In combination with a converter and the active shield, the controller reduces the fundamental component of the magnetic stray field of an induction heater by generating a magnetic counter field in a defined target area. The controller uses two input signals (from two magnetic field sensors) and generates amplitude and phase information for the converter. Based on this information, the latter produces the compensation current wave that is sent to the compensation coils to minimise the magnetic field. The frequency range of the controller is 1-100 kHz. Its dynamic behaviour is explained in theory and validated by experiments

Keywords

coils; controllers; electric current control; induction heating; machine control; magnetic shielding; 1 to 100 kHz; active magnetic shield; amplitude information; compensation coils; converter; hardware controller; induction heater; magnetic counter field; magnetic field sensors; magnetic stray field; phase information;

fLanguage

English

Journal_Title

Science, Measurement & Technology, IET

Publisher

iet

ISSN

1751-8822

Type

jour

DOI

10.1049/iet-smt:20060067

Filename

4152468