Embedded printed magnetic needle probes sensor for the real-time control of the local induction state through a laminated magnetic core

Sorelle Hilary Nguedjang Kouakeuo (1, 2, 3) , Y.A. Tena Deffo (1) , B. Ducharne (2) , Laurent Morel (3) , M.A. Raulet (3) , P. Tsafack (1) , J.M. Garcia-Bravo (4) , B. Newell (4)

1 University of Buéa
2 LGEF - Laboratoire de Génie Electrique et Ferroélectricité
3 EE - Ampère, Département Energie Electrique
4 Purdue University [West Lafayette]

The magnetic needle probe method is a technique used to locally measure the magnetic state of a magnetic component. This concept has a rich conceptual history, but it has rarely been used in the industrial field. There are mainly two reasons for this: instrumentation limitations and inappropriate sizes of sensors’ geometries. The first limitation has been overcome recently due to large improvements in both the analog and digital electronic fields. In this study, the second limitation, size/geometry is addressed by printing the magnetic needle probe using conductive ink directly on the ferromagnetic element to be controlled. The resulting sensor exhibits a drastic volume reduction. Such improvements allow measurement of the magnetic state of a previously inaccessible magnetic lamination through a magnetic laminated core. This opens up the possibility of measuring in situ magnetic behavior and monitoring many electromagnetic devices such as electric transformers, AC/DC electric motors, or even real-time electromagnetic non-destructive testing of ferromagnetic steel components. Over the past few years, simulation approaches including space discretization methods: finite elements, finite differences, and boundary elements have been proposed to describe the internal behavior of magnetic lamination stacks but experimental results validating these simulations could not be realized due to the aforementioned limitations. The printed magnetic needle probe method (PMNPM) described in this paper can be used to collect such local information and to validate homogenization methods. Experimental validations are proposed by comparing the sum of the laminations magnetic induction, they are individually measured with the PMNPM method to calculate the average induction obtained from a surrounding coil.

Domaines: Sciences de l'ingénieur [physics]

Sorelle Hilary Nguedjang Kouakeuo, Y.A. Tena Deffo, B. Ducharne, Laurent Morel, M.A. Raulet, et al.. Embedded printed magnetic needle probes sensor for the real-time control of the local induction state through a laminated magnetic core. Journal of Magnetism and Magnetic Materials, 2020, 505, pp.166767. ⟨10.1016/j.jmmm.2020.166767⟩. ⟨hal-02559888⟩