Non-invasive local magnetic hysteresis characterization of a ferromagnetic laminated core

• Published in: Journal of magnetism and magnetic materials Vol. 527
• Main Authors: Nguedjang Kouakeuo, Sorelle Hilary, Ducharne, Benjamin, Solignac, A., Morel, Laurent, Raulet, Marie-Ange, Toutsop, B., Tene Deffo, Y. A., Tsafack, P.
• Format: Journal Article
• Language: English
• Published: Elsevier 2021
• Subjects: Condensed Matter; Nonlinear Sciences; Physics; hysteresis characterization; micrometric giant magnetoresistance; printing technology; needle probe method; non-invasive sensor; local measurement
• ISSN: 0304-8853; 1873-4766
• DOI: 10.1016/j.jmmm.2021.167783

An alternative sensing solution is described to measure local magnetic hysteresis cycles through a laminated magnetic core. Due to the reduced space gap separating two successive laminations, it is impossible to interpose the usual oversize magnetic sensors (wound coil, Halleffect sensor). In this study, the space issue has been solved by printing the needle probe method for the magnetic state monitoring and by using a micrometric Giant Magneto Resistance (GMR) for the magnetic excitation measurement. An instrumented magnetic lamination including the non-invasive monitoring solution has been built and moved successively to every lamination position of the whole laminated ferromagnetic core. A precise cartography of the hysteresis losses has been reconstructed from all these local measurements and the average values compared to the classic measurement methods obtained with a wound coil. The relative agreement between the experimental results observed opened doors to large improvement in the estimation of magnetic losses and in the design of magnetic circuits.