Title :
Using the Dynamic Behavior of Superimposed Fields for Point-Field-Based Current Sensing
Author :
Olson, Erik R. ; Lorenz, Robert D.
Author_Institution :
Sandia Nat. Labs., Albuquerque, NM
Abstract :
The dynamic behavior of magnetic fields surrounding adjacent current-carrying conductors is investigated for the purpose of point-field-based current sensing. The influence of eddy currents on magnetic field distribution over the useful spectrum (dc to 1 MHz) is quantified by using a spatially dependent metric, the 5% flat bandwidth (FBW). A comparison of field distributions at DC and 1 MHz shows the origin of the FBW function, which is unique to each conductor´s cross section and nearby environment. The FBW fields for several different conductor geometries are analyzed. Superposition is used for conductor geometries that have multiple currents. A method for determining optimal field detector placement using optimization functions is introduced.
Keywords :
conductors (electric); eddy currents; electric sensing devices; magnetic fields; magnetic sensors; bandwidth 1 MHz; current-carrying conductors; dynamic behavior; eddy currents; flat bandwidth; magnetic field detector; magnetic field distribution; optimization functions; point-field-based current sensing; spatially dependent metric; superimposed magnetic fields; Bandwidth; Conductors; Costs; Detectors; Giant magnetoresistance; Magnetic cores; Magnetic fields; Magnetic sensors; Power electronics; Shunt (electrical); Current sensing; field decoupling; giant magnetoresistive; magnetic field detectors; proximity effect; skin effect; superimposed fields;
Journal_Title :
Industry Applications, IEEE Transactions on
DOI :
10.1109/TIA.2008.926207
