小型電磁気センサを利用したダクタイル鋳鉄の圧縮応力測定の検討

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  • Study on Measurement of Compressive Stress of Ductile Cast Iron using Small Electromagnetic Sensor
  • コガタデンジキ センサ オ リヨウ シタ ダクタイル チュウテツ ノ アッシュク オウリョク ソクテイ ノ ケントウ

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<p>  Generally, silicon steel material is used for the electromagnetic yoke in motors. In recent years, cast iron with high permeability is being developed and its application as yoke material is considered. During the shrinkage fitting process of motors, compressive stress is applied to the electromagnetic yoke. As this decreases magnetic properties, methods for inspecting compression stress in the manufacturing process of motors is required. When cast iron is compressed, permeability decreases. Similarly, the permeability of the magnetic yoke in the motor changes when compressed stress is applied. This means that the compressive stress of cast iron can be inspected by observing the changes in the magnetic properties of the cast iron.</p><p>  In this paper, the authors propose a small electromagnetic inspection sensor capable of measuring the compressive stress inside cast iron magnetic yoke in motors. The compressive stress in the cast iron when the cast iron magnetic yoke is compressed by shrinkage fitting was calculated by 3-D stress analysis using the finite element method (FEM). The size of compressive stress inside cast iron can be obtained by evaluating the flux density inside the cast iron using 3-D nonlinear electromagnetic FEM taking into account electromagnetic properties under various compressive stresses.</p><p>  Since the permeability of cast iron changes according to the compressive stress, compressive stress in cast iron can be evaluated by detecting the change in flux density using electromagnetic inspection. However, the flux signal is also influenced by the change in distance (lift-off : Lo) between the cast iron and proposed electromagnetic inspection sensor.</p><p>  In this study, we also show that compressive stress in cast iron can be estimated by detecting the changes in the amplitude and phase difference in the flux density in a search coil of the proposed inspection sensor. We also conducted experimental verification considering the effects of lift-off.</p>

収録刊行物

  • 鋳造工学

    鋳造工学 85 (12), 872-880, 2013

    公益社団法人 日本鋳造工学会

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