A Practical Method to Measure Electrical AC Conductivity of MnZn Ferrites Using Conventional Toroids

作者：Stadler Alexander^*; Albach Manfred; Lindner Andreas

来源：IEEE Transactions on Magnetics, 2010, 46(2): 678-681.

DOI：10.1109/TMAG.2009.2030157

• Electric variables
• impedance measurement
• inductors
• losses
• soft magnetic materials

In this paper, a new method to construct ac electrical properties from impedance measurements using conventional ring core specimens is proposed. Different coaxial cartridges are developed allowing four-wire measurements with an automatic compensation of the test-leads. To achieve optimum results, the specific material parameters are reconstructed from the measured impedances by means of an analytical solution of Maxwell's equations for the toroidal sample geometry. Hence inhomogeneous electromagnetic fields due to occurring eddy currents and displacement currents are considered up to the megahertz range. To investigate the influence of the temperature on the electrical properties, the temperature-resistant cartridges can be transferred into a heating cabinet-specific results are finally exemplified for different MnZn ferrite materials.

• 出版日期2010-2