Title :
An analytical model of the effect of external DC magnetic fields on the AC voltages of an LVDT
Author :
Martino, Michele ; Golluccio, Giancarlo ; Losito, Roberto ; Masi, Alessandro
Author_Institution :
Dipt. di Ing. Elettr., Univ. di Napoli Federico II, Naples, Italy
Abstract :
An analytical model to describe the effects of an external DC magnetic field on the harmonics amplitude of the secondary voltages of a Linear Variable Differential Transformer LVDT is proposed. A very general approach is used based on the introduction of the equivalent differential permeability concept that takes into account the sensor´s geometry as well as the magnetic properties of its materials. The focus is mainly on the nonlinearity of the material of the LVDT´s core since it is the material with the highest permeability. The proposed model is finally validated by means of measurements performed on a prototype explicitly built for that purpose.
Keywords :
differential transformers; inductive sensors; magnetic field measurement; magnetic permeability; AC voltages; LVDT; equivalent differential permeability concept; external DC magnetic fields; harmonics amplitude; linear variable differential transformer; Analytical models; Geometry; Magnetic cores; Magnetic materials; Magnetic properties; Performance evaluation; Permeability; Prototypes; Transformer cores; Voltage;
Conference_Titel :
Instrumentation and Measurement Technology Conference (I2MTC), 2010 IEEE
Conference_Location :
Austin, TX
Print_ISBN :
978-1-4244-2832-8
Electronic_ISBN :
1091-5281
DOI :
10.1109/IMTC.2010.5488116