Evaluation of Insulating Magnetic Materials Composed of Epoxy Resin and Pure Iron Powder for Motor and Reactor Core Applications
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- Hirata Katsuya
- Hitachi Industrial Equipment Systems Co., Ltd. Graduate School of Science and Technology, Meiji University
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- Obara Gaku
- Graduate School of Science and Technology, Meiji University
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- Katsumata Hiroshi
- Graduate School of Science and Technology, Meiji University
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Description
<p>The insulation and magnetic properties of epoxy composed of pure iron powders were studied as a function of iron powder volume fraction (RFe) in the range of 0-70vol% to achieve a good balance between the insulation and magnetic properties. Frequency-dependent impedance measurement revealed that the relative permittivity, εr', at 10kHz increased from 4.2 to 278.4 with increasing RFe up to 50vol%. The loss factor, εr”, increased from 0.2 to 86.1 and the electric conductivity, σ, increased from 9.9 × 10-8S/m to 4.8 × 10-5S/m at 10kHz with increasing RFe up to 50vol%. The dependence of σ on RFe was explained by the equivalent serial capacitor-resistor (CR) connection model. The initial maximum relative permeability, μr_max, increased from 3.7 to 8.9 with increasing RFe up to 70vol%. These data were compared with those for the “Reference” sample which has been in practical use in industrial electric machine applications.</p>
Journal
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- IEEJ Journal of Industry Applications
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IEEJ Journal of Industry Applications 10 (6), 606-611, 2021-11-01
The Institute of Electrical Engineers of Japan