{"id":209193,"date":"2024-03-21T14:06:33","date_gmt":"2024-03-21T14:06:33","guid":{"rendered":"https:\/\/www.electricity-magnetism.org\/%e3%82%b9%e3%82%ad%e3%83%b3%e6%b7%b1%e5%ba%a6%e3%81%ae%e5%85%ac%e5%bc%8f-%e6%a6%82%e8%a6%81%e3%80%81%e8%a8%88%e7%ae%97%e6%96%b9%e6%b3%95-%e5%bf%9c%e7%94%a8\/"},"modified":"2024-05-17T15:08:44","modified_gmt":"2024-05-17T15:08:44","slug":"%e3%82%b9%e3%82%ad%e3%83%b3%e6%b7%b1%e5%ba%a6%e3%81%ae%e5%85%ac%e5%bc%8f-%e6%a6%82%e8%a6%81%e3%80%81%e8%a8%88%e7%ae%97%e6%96%b9%e6%b3%95-%e5%bf%9c%e7%94%a8","status":"publish","type":"post","link":"https:\/\/www.electricity-magnetism.org\/ja\/%e3%82%b9%e3%82%ad%e3%83%b3%e6%b7%b1%e5%ba%a6%e3%81%ae%e5%85%ac%e5%bc%8f-%e6%a6%82%e8%a6%81%e3%80%81%e8%a8%88%e7%ae%97%e6%96%b9%e6%b3%95-%e5%bf%9c%e7%94%a8\/","title":{"rendered":"\u30b9\u30ad\u30f3\u6df1\u5ea6\u306e\u516c\u5f0f | \u6982\u8981\u3001\u8a08\u7b97\u65b9\u6cd5 &#038; \u5fdc\u7528"},"content":{"rendered":"<p class=\"sidekick\">\u30b9\u30ad\u30f3\u6df1\u5ea6\u306e\u6982\u8981\u3001\u516c\u5f0f\u3001\u8a08\u7b97\u65b9\u6cd5\u3001\u5fdc\u7528\u3092\u8a73\u3057\u304f\u89e3\u8aac\u3002\u9ad8\u5468\u6ce2\u56de\u8def\u3001\u96fb\u78c1\u6ce2\u906e\u853d\u3001\u6e26\u96fb\u6d41\u640d\u5931\u3001\u975e\u7834\u58ca\u691c\u67fb\u3078\u306e\u5f71\u97ff\u3092\u8aac\u660e\u3002<\/p>\n<h2>\u30b9\u30ad\u30f3\u6df1\u5ea6\u306e\u516c\u5f0f | \u6982\u8981\u3001\u8a08\u7b97\u65b9\u6cd5 &#038; \u5fdc\u7528<\/h2>\n<p>\u30b9\u30ad\u30f3\u6df1\u5ea6\uff08Skin depth\uff09\u306f\u3001\u96fb\u78c1\u6ce2\u304c\u5c0e\u4f53\u5185\u90e8\u306b\u6d78\u900f\u3059\u308b\u969b\u306b\u3001\u305d\u306e\u5f37\u5ea6\u304c\u3069\u308c\u3060\u3051\u6e1b\u8870\u3059\u308b\u304b\u3092\u8868\u3059\u91cd\u8981\u306a\u6982\u5ff5\u3067\u3059\u3002\u7279\u306b\u9ad8\u5468\u6ce2\u96fb\u6c17\u56de\u8def\u3084\u96fb\u78c1\u6ce2\u4f1d\u642c\u306e\u5206\u91ce\u3067\u983b\u7e41\u306b\u4f7f\u7528\u3055\u308c\u307e\u3059\u3002\u3053\u3053\u3067\u306f\u3001\u30b9\u30ad\u30f3\u6df1\u5ea6\u306e\u516c\u5f0f\u3001\u8a08\u7b97\u65b9\u6cd5\u3001\u304a\u3088\u3073\u305d\u306e\u5fdc\u7528\u306b\u3064\u3044\u3066\u89e3\u8aac\u3057\u307e\u3059\u3002<\/p>\n<h2>\u30b9\u30ad\u30f3\u6df1\u5ea6\u306e\u6982\u8981<\/h2>\n<p>\u30b9\u30ad\u30f3\u6df1\u5ea6\u3068\u306f\u3001\u96fb\u78c1\u6ce2\u304c\u5c0e\u4f53\u306b\u5165\u5c04\u3057\u305f\u3068\u304d\u306b\u3001\u305d\u306e\u632f\u5e45\u304c\u521d\u671f\u5024\u306e \\(\\frac{1}{e}\\)\uff08\u7d0436.8%\uff09\u307e\u3067\u6e1b\u8870\u3059\u308b\u6df1\u3055\u3092\u6307\u3057\u307e\u3059\u3002\u3053\u308c\u306b\u3088\u308a\u3001\u5c0e\u4f53\u5185\u90e8\u3092\u6d41\u308c\u308b\u96fb\u6d41\u306f\u8868\u9762\u4ed8\u8fd1\u306b\u96c6\u4e2d\u3057\u3084\u3059\u304f\u306a\u308a\u307e\u3059\u3002<\/p>\n<h2>\u30b9\u30ad\u30f3\u6df1\u5ea6\u306e\u516c\u5f0f<\/h2>\n<p>\u30b9\u30ad\u30f3\u6df1\u5ea6 \\(\\delta\\) \u306f\u4ee5\u4e0b\u306e\u516c\u5f0f\u3067\u8868\u3055\u308c\u307e\u3059\uff1a<\/p>\n<pre>\n\\[ \\delta = \\sqrt{\\frac{2\\rho}{\\omega \\mu}} \\]\n<\/pre>\n<p>\u3053\u3053\u3067\u3001<\/p>\n<ul>\n<li>\\(\\rho\\): \u5c0e\u96fb\u7387\uff08\u30aa\u30fc\u30e0\u30e1\u30fc\u30c8\u30eb \\(\\Omega \\cdot m\\)\uff09<\/li>\n<li>\\(\\omega\\): \u89d2\u5468\u6ce2\u6570\uff08\u30e9\u30b8\u30a2\u30f3\u6bce\u79d2 \\(rad\/s\\)\uff09\u3001\\(\\omega = 2\\pi f\\) \u3067 \\(f\\) \u306f\u5468\u6ce2\u6570\uff08\u30d8\u30eb\u30c4 \\(Hz\\)\uff09<\/li>\n<li>\\(\\mu\\): \u900f\u78c1\u7387\uff08\u30d8\u30f3\u30ea\u30fc\u6bce\u30e1\u30fc\u30c8\u30eb \\(H\/m\\)\uff09\u3001\u771f\u7a7a\u4e2d\u3067\u306f \\(\\mu_0 \\approx 4\\pi \\times 10^{-7} H\/m\\)<\/li>\n<\/ul>\n<h2>\u30b9\u30ad\u30f3\u6df1\u5ea6\u306e\u8a08\u7b97\u65b9\u6cd5<\/h2>\n<p>\u30b9\u30ad\u30f3\u6df1\u5ea6\u306e\u8a08\u7b97\u306f\u3001\u524d\u8ff0\u306e\u516c\u5f0f\u3092\u7528\u3044\u3066\u884c\u3044\u307e\u3059\u3002\u4ee5\u4e0b\u306b\u4f8b\u3068\u3057\u3066\u3001\u9285\u306e\u30b9\u30ad\u30f3\u6df1\u5ea6\u3092\u8a08\u7b97\u3057\u3066\u307f\u307e\u3057\u3087\u3046\u3002\u9285\u306e\u5c0e\u96fb\u7387 \\(\\rho\\) \u306f\u7d04 \\(1.68 \\times 10^{-8} \\Omega \\cdot m\\) \u3067\u3059\u3002\u5468\u6ce2\u6570 \\(f\\) \u3092 1 MHz\uff08\u30e1\u30ac\u30d8\u30eb\u30c4\uff09\u3068\u3059\u308b\u3068:<\/p>\n<pre>\n\\[\n\\omega = 2\\pi f = 2\\pi \\times 1 \\times 10^6 \\approx 6.28 \\times 10^6 \\, rad\/s\n\\]\n\n\\[\n\\delta = \\sqrt{\\frac{2 \\times 1.68 \\times 10^{-8}}{6.28 \\times 10^6 \\times 4\\pi \\times 10^{-7}}}\n\\]\n\n\\[\n\\delta \\approx \\sqrt{\\frac{3.36 \\times 10^{-8}}{2.51 \\times 10^{-6}}}\n\\]\n\n\\[\n\\delta \\approx \\sqrt{1.34 \\times 10^{-2}} \\approx 3.66 \\times 10^{-2} \\,m \\approx 36 \\,\u00b5m\n\\]\n<\/pre>\n<p>\u3053\u306e\u7d50\u679c\u304b\u3089\u30011 MHz\u306e\u5468\u6ce2\u6570\u3067\u306f\u3001\u9285\u306e\u30b9\u30ad\u30f3\u6df1\u5ea6\u306f\u7d04 36 \u30de\u30a4\u30af\u30ed\u30e1\u30fc\u30c8\u30eb\u3068\u306a\u308a\u307e\u3059\u3002<\/p>\n<h2>\u30b9\u30ad\u30f3\u6df1\u5ea6\u306e\u5fdc\u7528<\/h2>\n<p>\u30b9\u30ad\u30f3\u6df1\u5ea6\u306e\u6982\u5ff5\u306f\u3001\u4ee5\u4e0b\u306e\u3088\u3046\u306a\u69d8\u3005\u306a\u96fb\u6c17\u30fb\u96fb\u5b50\u6a5f\u5668\u3084\u6280\u8853\u306b\u5fdc\u7528\u3055\u308c\u3066\u3044\u307e\u3059\uff1a<\/p>\n<h3>1. \u9ad8\u5468\u6ce2\u56de\u8def\u8a2d\u8a08<\/h3>\n<p>\u9ad8\u5468\u6ce2\u56de\u8def\u306b\u304a\u3044\u3066\u3001\u5c0e\u4f53\u306e\u30b9\u30ad\u30f3\u52b9\u679c\u3092\u8003\u616e\u3057\u3066\u8a2d\u8a08\u3059\u308b\u3053\u3068\u3067\u3001\u640d\u5931\u3092\u6700\u5c0f\u9650\u306b\u6291\u3048\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u4f8b\u3048\u3070\u3001\u540c\u8ef8\u30b1\u30fc\u30d6\u30eb\u3084\u30de\u30a4\u30af\u30ed\u30b9\u30c8\u30ea\u30c3\u30d7\u30e9\u30a4\u30f3\u306e\u8a2d\u8a08\u306b\u304a\u3044\u3066\u91cd\u8981\u3067\u3059\u3002<\/p>\n<h3>2. \u96fb\u78c1\u6ce2\u906e\u853d<\/h3>\n<p>EMI\uff08\u96fb\u78c1\u5e72\u6e09\uff09\u5bfe\u7b56\u3001\u3064\u307e\u308a\u96fb\u78c1\u6ce2\u306e\u906e\u853d\u306b\u304a\u3044\u3066\u3082\u30b9\u30ad\u30f3\u6df1\u5ea6\u304c\u8003\u616e\u3055\u308c\u307e\u3059\u3002\u9069\u5207\u306a\u6750\u6599\u3068\u539a\u307f\u3092\u9078\u5b9a\u3059\u308b\u3053\u3068\u3067\u3001\u52b9\u679c\u7684\u306b\u96fb\u78c1\u6ce2\u3092\u906e\u853d\u3067\u304d\u307e\u3059\u3002<\/p>\n<h3>3. \u6e26\u96fb\u6d41\u640d\u5931<\/h3>\n<p>\u30c8\u30e9\u30f3\u30b9\u3084\u30e2\u30fc\u30bf\u30fc\u306e\u30b3\u30a2\u6750\u306b\u304a\u3044\u3066\u3001\u30b9\u30ad\u30f3\u52b9\u679c\u306b\u3088\u308b\u6e26\u96fb\u6d41\u640d\u5931\u3092\u8efd\u6e1b\u3059\u308b\u305f\u3081\u306b\u3001\u30e9\u30f3\u30df\u30cd\u30fc\u30b7\u30e7\u30f3\u3055\u308c\u305f\u92fc\u677f\u304c\u4f7f\u7528\u3055\u308c\u307e\u3059\u3002\u3053\u308c\u306b\u3088\u308a\u30a8\u30cd\u30eb\u30ae\u30fc\u52b9\u7387\u304c\u5411\u4e0a\u3057\u307e\u3059\u3002<\/p>\n<h3>4. \u975e\u7834\u58ca\u691c\u67fb<\/h3>\n<p>\u30b9\u30ad\u30f3\u52b9\u679c\u3092\u5229\u7528\u3057\u305f\u6e26\u96fb\u6d41\u691c\u67fb\u6cd5\u306f\u3001\u914d\u7ba1\u3084\u822a\u7a7a\u6a5f\u69cb\u9020\u306a\u3069\u306e\u975e\u7834\u58ca\u691c\u67fb\u306b\u5e83\u304f\u7528\u3044\u3089\u308c\u3066\u3044\u307e\u3059\u3002\u6750\u6599\u306e\u5185\u90e8\u6b20\u9665\u3092\u691c\u51fa\u3059\u308b\u969b\u306b\u5f79\u7acb\u3061\u307e\u3059\u3002<\/p>\n<hr>\n<p>\u30b9\u30ad\u30f3\u6df1\u5ea6\u306e\u6982\u5ff5\u306f\u3001\u96fb\u78c1\u6c17\u5b66\u3084\u5de5\u5b66\u306e\u591a\u304f\u306e\u5206\u91ce\u3067\u91cd\u8981\u306a\u5f79\u5272\u3092\u679c\u305f\u3057\u3066\u3044\u307e\u3059\u3002\u3053\u306e\u57fa\u672c\u7684\u306a\u7406\u89e3\u3068\u8a08\u7b97\u65b9\u6cd5\u3092\u62bc\u3055\u3048\u3066\u304a\u304f\u3053\u3068\u3067\u3001\u69d8\u3005\u306a\u5fdc\u7528\u306b\u5bfe\u5fdc\u3067\u304d\u308b\u3067\u3057\u3087\u3046\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u30b9\u30ad\u30f3\u6df1\u5ea6\u306e\u6982\u8981\u3001\u516c\u5f0f\u3001\u8a08\u7b97\u65b9\u6cd5\u3001\u5fdc\u7528\u3092\u8a73\u3057\u304f\u89e3\u8aac\u3002\u9ad8\u5468\u6ce2\u56de\u8def\u3001\u96fb\u78c1\u6ce2\u906e\u853d\u3001\u6e26\u96fb\u6d41\u640d\u5931\u3001\u975e\u7834\u58ca\u691c\u67fb\u3078\u306e\u5f71\u97ff\u3092\u8aac\u660e\u3002<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_generate-full-width-content":"","footnotes":""},"categories":[96],"tags":[97],"class_list":["post-209193","post","type-post","status-publish","format-standard","hentry","category-96","tag-97","generate-columns","tablet-grid-50","mobile-grid-100","grid-parent","grid-50"],"yoast_head":"<!-- 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