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\u9069\u7528\u5909\u5727\u5668\u53ca\u3073\u539f\u5b50\u7089\u306b\u306f\u3001\u30cd\u30fc\u30b6\u30f3\u30ed\u30fc\u30c9-\u30af\u30ec\u30a4\u30f3\u30b7\u30ca\u30ea\u30aa<\/p>\n

1.1\u30bf\u30ef\u30fc\u30af\u30ec\u30fc\u30f3\u306e\u7279\u7570\u7684\u30c8\u30e9\u30f3\u30b9:\u96fb\u5727\u5909\u63db\u3001\u5f37-\u5f31\u96fb\u5206\u96e2\u306f\u591a\u56de\u8def\u96fb\u529b\u6d41\u901a<\/h3>\n

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1.2\u30a4\u30f3\u30d0\u30fc\u30bf\u306e\u5165\u529b\u7089\u5185\u3092\u6291\u3048\u308b\u30b9\u30a4\u30c3\u30c1\u306e\u7a81\u5165\u96fb\u6d41\u304a\u3088\u3073\u30d5\u30a3\u30eb\u30bf\u30b0\u30ea\u30c3\u30c9\u5074\u9ad8\u8abf\u6ce2<\/h3>\n

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1.3\u30a4\u30f3\u30d0\u30fc\u30bf\u306e\u51fa\u529b\u30ea:\u5438\u53cePWM\u96fb\u5727\u30b9\u30d1\u30a4\u30af\u3001\u4fdd\u8b77\u3059\u308b\u5dfb\u4e0a\u30e2\u30fc\u30bf\u30fc\u5dfb\u7dda<\/h3>\n

\u30a4\u30f3\u30d0\u30fc\u30bf\u306e\u51fa\u529b\u306e\u9ad8\u5468\u6ce2\u6570\u3067PWM\u30d1\u30eb\u30b9\u306e\u96fb\u5727\u304c\u5fc5\u8981\u306b\u306a\u308a\u307e\u3059\uff61 \u96fb\u529b\u30b1\u30fc\u30d6\u30eb\u304b\u3089\u96fb\u6c17\u30ad\u30e3\u30d3\u30cd\u30c3\u30c8\u30bf\u30ef\u30fc-\u30af\u30ec\u30fc\u30f3\u30e2\u30fc\u30bf\u30fc\u306f\u6bd4\u8f03\u7684\u9577\u3044\u306e\u3067\u3001\u4f5c\u96fb\u5727\u53cd\u5c04\u52b9\u679c\u3092\u91cd\u306d\u5408\u308f\u305b\u306e\u30d1\u30eb\u30b9\u306e\u30b9\u30d1\u30a4\u30af\u306e\u6570\u500d\u306e\u5b9a\u683c\u96fb\u5727\u3067\u3059\u3002 \u7e70\u308a\u8fd4\u3057\u306e\u5f71\u97ff\u306f\u3001\u9ad8\u5468\u6ce2\u30b9\u30d1\u30a4\u30af\u304c\u4f4e\u4e0b\u30e2\u30fc\u30bf\u30fc\u5dfb\u7dda\u306e\u7d76\u7e01\u306e\u6642\u3001\u7d76\u7e01\u6027\u3001\u9ad8\u9f62\u5316\u3001\u6f0f\u96fb\u3084\u6700\u7d42\u5dfb\u7dda\u6a5f\u3067\u3059\u3002 \u51fa\u529b\u7089\u306e\u5186\u6ed1\u306a\u30a4\u30f3\u30d0\u30fc\u30bf\u51fa\u529b\u30d1\u30eb\u30b9\u6ce2\u5f62\u3092\u5438\u53cedv\/dt\u96fb\u5727\u30b9\u30d1\u30a4\u30af\u8efd\u6e1b\u3057\u3001\u30b1\u30fc\u30d6\u30eb\u306e\u8a98\u8d77\u96fb\u5727\u53cd\u5c04\u52b9\u679c\u3002 \u305d\u306e\u524a\u6e1b\u904e\u96fb\u5727\u30b9\u30c8\u30ec\u30b9\u30e2\u30fc\u30bf\u30fc\u5dfb\u7dda\u3001\u7d76\u7e01\u5bff\u547d\u306e\u308a\u4e0a\u3052\u3001\u65cb\u56de\u3001\u4fef\u4ef0\u306e\u30e2\u30fc\u30bf\u30fc\u4e0b\u30e2\u30fc\u30bf\u30fc\u71c3\u713c\u30ea\u30b9\u30af\u306b\u5bfe\u3059\u308b \u3082\u6291\u5236\u3059\u308b\u9ad8\u5468\u6ce2\u96fb\u6d41\u30e2\u30fc\u30bf\u5074\u306e\u8efd\u6e1b\u53ca\u3073\u8ca0\u96fb\u6c17-\u8150\u98df\u30ea\u30b9\u30af\u306b\u5bfe\u3059\u308b<\/p>\n

\u30b3\u30a2\u30e1\u30bf\u30ef\u30fc\u30af\u30ec\u30fc\u30f3-\u7279\u5b9a\u306e\u88fd\u54c1\u3068\u6c4e\u7528\u5de5\u696d\u88fd\u54c1<\/p>\n

2.1\u5f37\u5236\u632f\u69cb\u9020\u306e\u305f\u3081\u306e\u6301\u7d9a\u7684\u6a5f\u68b0\u7684\u306a\u30b7\u30e7\u30c3\u30af\u30bf\u30ef\u30fc\u30af\u30ec\u30fc\u30f3<\/h3>\n

\u30bf\u30ef\u30fc\u30af\u30ec\u30fc\u30f3\u4e0b\u3067\u306e\u9023\u7d9a\u632f\u52d5\u306e\u958b\u59cb-\u505c\u6b62\u30d6\u30ec\u30fc\u30ad\u30f3\u30b0\u3068\u65cb\u56de\u6301\u53c2\u306e\u5b9a\u671f\u7684\u306a\u30b7\u30e7\u30c3\u30af\u3002 \u306e\u30bf\u30ef\u30fc\u30af\u30ec\u30fc\u30f3\u306e\u7279\u7570\u7684\u30c8\u30e9\u30f3\u30b9\u53ca\u3073\u539f\u5b50\u7089\u3092\u63a1\u7528\u3057\u5168\u9762\u5f37\u5316\u30af\u30e9\u30f3\u30d7\u69cb\u9020\u3002 \u9244\u82af\u3084\u30b3\u30a4\u30eb\u306e\u7de0\u3081\u306b\u3088\u308b\u9ad8\u5f37\u5ea6\u306a\u5f35\u529b\u30dc\u30eb\u30c8\u306e\u30ec\u8010\u9ad8\u6e29\u53cd\u3086\u3063\u305f\u308a\u30ac\u30b9\u30b1\u30c3\u30c8\u3092\u30ed\u30c3\u30af\u3057\u3066\u3044\u307e\u3059\u3002 \u69cb\u9020\u7684\u306b\u3082\u6392\u9664\u30b3\u30a4\u30eb\u5909\u4f4d\u306e\u7d76\u7e01\u8010\u6469\u8017\u6027\u3001\u30d5\u30a1\u30b9\u30ca\u30fc\u306e\u7de9\u307f\u306b\u3088\u308b\u9577\u671f\u632f\u52d5\u3068\u306a\u308a\u307e\u3059\u3002 \u6c4e\u7528\u7523\u696d\u7528\u30c8\u30e9\u30f3\u30b9\u3001\u7089\u8a2d\u8a08\u306e\u305f\u3081\u306e\u9759\u7684\u306a\u5ba4\u5185\u8a2d\u5099\u306a\u9632\u632f-\u88dc\u5f37\u3002 \u306e\u4e0b\u3067\u306e\u6301\u7d9a\u7684\u306a\u632f\u52d5\u306b\u3088\u3063\u3066\u69cb\u6210\u3055\u308c\u3066\u3044\u308b\u304c\u5185\u90e8\u306e\u306e\u7de9\u307f\u306b\u3088\u308b\u7570\u5e38\u30ce\u30a4\u30ba\u3068\u5730\u65b9\u306e\u904e\u71b1\u3084\u5408\u5185\u306b\u306f1\uff5e2\u5e74\u3067\u3059\u3002<\/p>\n

2.2\u4e09\u8a3c\u660e\u306e\u7d76\u7e01\u542b\u6d78\u5de5\u7a0b\u306e\u30c0\u30b9\u30c8\u304c\u6e7f\u6f64\u9732\u5730\u6761\u4ef6<\/h3>\n

\u30b3\u30a4\u30eb\u63a1\u7528\u306e\u771f\u7a7a-\u52a0\u5727\u542b\u6d78(VPI)\u3092\u5b9f\u73fe\u3059\u308b\u306b\u306f\u9632\u6e7f\u3001\u9632\u30ab\u30d3-\u9632\u5875-\u8010\u307e\u3059\u3002 \u9ad8\u7d76\u7e01\u5b9a\u683c\u306b\u5bfe\u5fdc\u3001\u5e83\u3044\u6e29\u5ea6\u7bc4\u56f2\u306b\u9069\u5fdc\u30bf\u30ef\u30fc\u30af\u30ec\u30fc\u30f3\u306e\u96fb\u6c17\u30ad\u30e3\u30d3\u30cd\u30c3\u30c8\u306b\u6652\u3055\u308c\u3066\u4ea4\u4e92\u306b\u7c89\u5875\u3084\u96e8-\u6c34\u5206\u3068\u6e29\u5ea6\u306e\u632f\u5e45\u3092\u69cb\u7bc9\u3057\u305f\u3002 \u5f93\u6765\u306e\u4e7e\u5f0f\u5909\u5727\u5668\u306e\u7279\u5fb4\u306e\u7d76\u7e01\u4fdd\u8b77\u306e\u307f\u3092\u6e05\u6f54\u3067\u4e7e\u71e5\u5ba4\u5185\u306e\u304a\u90e8\u5c4b\u3067\u3059\u3002 \u4e00\u5ea6\u7c89\u5875\u3084\u6c34\u5206\u306e\u6d78\u900f\u3057\u3001\u65ad\u71b1\u6027\u80fd\u306e\u4f4e\u4e0b\u3092\u6025\u901f\u306b\u30ea\u30b9\u30af\u306e\u6f0f\u96fb\u3001\u77ed\u3044\u307e\u3059\u3002<\/p>\n

\u9ad8\u5468\u6ce2\u7089-LS\u96fb\u6e90\u30c8\u30e9\u30f3\u30b9\u3001\u7089\u3067\u306f\u3001\u9ad8\u96fb\u5727\u30c8\u30e9\u30f3\u30b9\u3001\u6cb9\u5165\u5909\u5727\u5668-\u9577\u6c99(\u9577\u6c99\u7687\u51a0\u4eee\u65e5\u9152\u5e97)\u5eec\u5c71\u96fb\u5b50\u6280\u8853\u682a\u5f0f\u682a\u5f0f\u4f1a\u793e<\/h3>\n

\u30a4\u30f3\u30c0\u30af\u30bf\u30f3\u30b9\u3001\u30b3\u30a2-\u7a7a\u6c17-\u30ae\u30e3\u30c3\u30d7\u306e\u30d1\u30e9\u30e1\u30fc\u30bf\u306e\u539f\u5b50\u7089\u306b\u5fdc\u3058\u305f\u77ed\u671f\u7684\u306a\u885d\u6483\u8377\u91cd\u306e\u5854\u3068\u30af\u30ec\u30fc\u30f3\u5dfb\u4e0a\u306e\u30e1\u30ab\u30cb\u30ba\u30e0\u3002 \u30bf\u30ef\u30fc\u30af\u30ec\u30fc\u30f3\u5dfb\u4e0a\u6f14\u77ed\u671f\u30d4\u30fc\u30af\u96fb\u6d41\u30b3\u30a2\u30ec\u30b8\u30b9\u30c8\u78c1\u6c17\u98fd\u548c\u306e\u4e0b\u3067\u77ac\u6642\u306b\u5f53\u30b7\u30e7\u30c3\u30af\u3092\u7dad\u6301\u3057\u5b89\u5b9a\u3057\u305f\u96fb\u6d41\u5236\u9650\u304a\u3088\u3073\u9ad8\u8abf\u6ce2\u6291\u5236\u3059\u3002 \u6c4e\u7528\u7089\u306e\u8a2d\u8a08\u306b\u304a\u3044\u3066\u7740\u7d9a\u3051\u307e\u3059\u3002 \u3055\u3089\u3059\u77ed\u671f\u306e\u91cd\u5854-\u30af\u30ec\u30a4\u30f3\u96fb\u6d41\u3001\u30b3\u30a2\u304c\u98fd\u548c\u3057\u305f\u6025\u901f\u306a\u30a4\u30f3\u30c0\u30af\u30bf\u30f3\u30b9\u304c\u6025\u843d\u3057\u3001\u4fdd\u8b77\u6a5f\u80fd\u306f\u5931\u308f\u308c\u307e\u3059\u3002<\/p>\n

2.4\u30ab\u30b9\u30bf\u30e0\u30b3\u30f3\u30d1\u30af\u30c8\u6982\u8981\u5bf8\u6cd5\u30c3\u9650\u5b9a\u3067\u8a2d\u7f6e\u30b9\u30da\u30fc\u30b9\u5185\u306e\u30bf\u30ef\u30fc\u30af\u30ec\u30fc\u30f3\u306e\u96fb\u6c17\u30ad\u30e3\u30d3\u30cd\u30c3\u30c8<\/h3>\n

\u96fb\u6c17\u30ad\u30e3\u30d3\u30cd\u30c3\u30c8\u4e0b\u30bf\u30ef\u30fc\u30af\u30ec\u30fc\u30f3\u30aa\u30da\u30ec\u30fc\u30bf\u30fc\u30ad\u30e3\u30d3\u30f3\u306f\u30b3\u30f3\u30d1\u30af\u30c8\u304c\u5bc6\u96c6\u3059\u308b\u5185\u90e8\u30ec\u30a4\u30a2\u30a6\u30c8\u3002 \u30ab\u30b9\u30bf\u30de\u30a4\u30ba\u53ef\u80fd\u3067\u3059\u306e\u9577\u3055\u3001\u5e45\u3068\u9ad8\u3055\u306b\u3088\u308b\u96fb\u6c17-\u5185\u95a3\u56f3\u9762\u304b\u3089\u30bf\u30ef\u30fc\u30af\u30ec\u30fc\u30f3\u306eOem\u306b\u3068\u3063\u3066\u3001\u6700\u9069\u5316\u306e\u6982\u8981\u304a\u3088\u3073\u7ba1\u7406\u88fd\u54c1\u306e\u30a6\u30a8\u30fc\u30c8\u3092\u5185\u95a3\u306e\u30ec\u30a4\u30a2\u30a6\u30c8\u3084\u8a2d\u7f6e\u3067\u304d\u307e\u3059\u3002 \u5b8c\u5168\u306a\u6a5f\u68b0\u30e1\u30fc\u30ab\u30fc\u3092\u907f\u3051\u308b\u5927\u898f\u6a21\u6539\u4fee\u306e\u5143\u96fb\u6c17-\u5185\u95a3\u69cb\u9020\u7269\u306e\u524a\u6e1b\u3092\u30ea\u30c7\u30b6\u30a4\u30f3\u3002<\/p>\n

2.5\u5e45\u5e83\u3044\u5165\u529b\u96fb\u5727\u306b\u8010\u3048\u308b\u30c7\u30b6\u30a4\u30f3\u306b\u5bfe\u5fdc\u3059\u308b\u4e0d\u5b89\u5b9a\u306a\u4e00\u6642\u30b5\u30a4\u30c8\u96fb\u6e90<\/h3>\n

\u30c8\u30e9\u30f3\u30b9\u306f\u8a31\u5bb9\u5e45\u5e83\u3044\u5165\u529b\u96fb\u5727\u504f\u5dee. \u6642\u30b5\u30a4\u30c8\u9593\u96fb\u5727\u306e\u30d4\u30fc\u30af\u6d88\u8cbb\u6642\u9593\u307e\u305f\u306f\u7acb\u3061\u4e0a\u304c\u308a\u3067\u3001\u30aa\u30d5\u30d4\u30fc\u30af\u6642\u9593\u5b89\u5b9a\u3057\u305f\u51fa\u529b\u3092\u7dad\u6301\u3059\u308b\u3053\u3068\u306b\u3088\u308a\u524a\u6e1b\u3092false\u306b\u4fdd\u8b77\u3057\u3001\u4e88\u671f\u305b\u306c\u505c\u6b62\u306b\u3088\u308a\u96fb\u5727\u5909\u52d5\u306b\u306f\u3001\u30cd\u30fc\u30b6\u30f3\u30ed\u30fc\u30c9-\u30af\u30ec\u30fc\u30f3\u5236\u5fa1\u30b7\u30b9\u30c6\u30e0\u3002<\/p>\n

\u696d\u754c\u7279\u6709\u306e\u554f\u984c\u3092\u89e3\u6d88\u304a\u3088\u3073\u7533\u8acb\u5024<\/p>\n

3.1\u8efd\u6e1b\u3059\u308b\u9ad8\u3044\u969c\u5bb3\u306e\u30ea\u30b9\u30af\u3092\u30bf\u30ef\u30fc\u30af\u30ec\u30fc\u30f3\u306e\u53ef\u5909\u5468\u6ce2\u6570\u96fb\u6c17-\u5236\u5fa1\u30b7\u30b9\u30c6\u30e0<\/h3>\n

\u4e2d\u30bf\u30ef\u30fc\u30af\u30ec\u30fc\u30f3\u306e\u96fb\u6c17\u7684\u6545\u969c\u306e\u30d0\u30fc\u30f3\u30a2\u30a6\u30c8\u306e\u30a4\u30f3\u30d0\u30fc\u30bf\u30e2\u30b8\u30e5\u30fc\u30eb\u304a\u3088\u3073\u7d76\u7e01\u88ab\u5bb3\u306e\u5dfb\u4e0a\u30e2\u30fc\u30bf\u30fc\u306e\u9ad8\u3044\u30d7\u30ed\u30dd\u30fc\u30b7\u30e7\u30f3\u3092\u4e3b\u306b\u3088\u308b\u5dfb\u304d\u4e0a\u3052\u8a98\u767a\u7a81\u5165\u96fb\u6d41\u3084\u9ad8\u5468\u6ce2PWM\u96fb\u5727\u30b9\u30d1\u30a4\u30af\u3067\u3059\u3002 \u8907\u5408\u30bd\u30ea\u30c8\u30e9\u30f3\u30b9\u30d5\u30a9\u30fc\u30de\u30fc\u30d7\u30e9\u30b9\u3067\u5165\u529b-\u51fa\u529b\u7089\u3092\u6291\u3048\u308b\u69d8\u3005\u306a\u96fb\u529b\u54c1\u8cea\u306a\u59a8\u5bb3\u6e90\u3092\u5927\u5e45\u306b\u4f4e\u6545\u969c\u7387\u30a4\u30f3\u30d0\u30fc\u30bf\u30fc\u3001\u5dfb\u4e0a\u30e2\u30fc\u30bf\u30fc\u53ca\u3073\u30b3\u30b9\u30c8\u524a\u6e1b\u306e\u305f\u3081\u306e\u4e88\u5099\u90e8\u54c1\u306e\u8abf\u9054\u3084\u30c8\u30e9\u30c3\u30b7\u30e5\u306e\u88dc\u4fee\u304c\u53ef\u80fd\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n

3.2\u89e3\u6d88\u306e\u65e9\u671f\u6210\u5206\u306e\u5931\u6557\u306b\u3088\u308b\u6301\u7d9a\u7684\u306a\u632f\u52d5<\/h3>\n

\u6642\u6c4e\u7528\u7523\u696d\u7528\u5909\u5727\u5668\u53ca\u3073\u7089\u306b\u88c5\u7740\u30bf\u30ef\u30fc\u30af\u30ec\u30fc\u30f3\u306e\u632f\u52d5\u304c\u5f90\u3005\u306b\u7de9\u307f\u306e\u5185\u90e8\u306e\u30b3\u30a4\u30eb\u306e\u7d76\u7e01\u88ab\u5bb3\u3001\u505c\u6b62\u5931\u6557\u5185\u306b\u306f1\uff5e2\u5e74\u3067\u3059\u3002 \u5f37\u5236\u632f\u69cb\u9020\u306e\u30d7\u30e9\u30b9\u306e\u771f\u7a7a-\u52a0\u5727\u542b\u6d78\u89e3\u6c7a\u306e\u65e9\u671f\u6210\u5206\u306e\u5931\u6557\u306b\u3088\u308b\u632f\u52d5\u306e\u5ef6\u9577\u3067\u3042\u308b\u30b5\u30fc\u30d3\u30b9\u751f\u6d3b\u3092\u652f\u63f4\u3059\u308b\u96fb\u6c17\u90e8\u54c1\u306e\u524a\u6e1b\u3092\u30d5\u30eb\u30e9\u30a4\u30d5\u30b5\u30a4\u30af\u30eb\u3092\u7dad\u6301\u30b3\u30b9\u30c8\u306e\u5b8c\u4e86\u307e\u3059\u3002<\/p>\n

3.3\u524a\u6e1b\u306e\u5b89\u5168\u6027\u30ea\u30b9\u30af\u306e\u9ad8\u8ca0\u8377\u8efd\u6e1b\u3059\u308b\u4e88\u5b9a\u640d\u5931<\/h3>\n

\u4e88\u671f\u305b\u306c\u505c\u6b62\u4e2d\u306e\u8449\u5dfb\u4e0a\u8377\u91cd\u3092\u639b\u3051\u6642\u9ad8\u3055\u3092\u906e\u65ad\u3059\u308b\u5de5\u4e8b\u3092\u5c0e\u5165\u3057\u5b89\u5168\u6027\u306b\u30ea\u30b9\u30af\u306e \u4fe1\u983c\u306e\u30c8\u30e9\u30f3\u30b9\u53ca\u3073\u539f\u5b50\u7089\u306e\u524a\u6e1b\u8a08\u753b\u5916\u6b62\u3001\u505c\u6b62\u3001\u4fdd\u8a3c\u7d99\u7d9a\u7684\u306a\u30b5\u30a4\u30c8\u69cb\u7bc9\u3001\u30ab\u30c3\u30c8\u30b5\u30a4\u30c8\u904b\u7528-\u4fdd\u5b88\u30e9\u30c3\u30b7\u30e5-\u4fee\u5fa9\u306e\u5468\u6ce2\u6570\u3084\u96fb\u6c17\u3092\u63d0\u4f9b\u3059\u308b\u4fdd\u8a3c\u306e\u305f\u3081\u306e\u30b9\u30b1\u30b8\u30e5\u30fc\u30eb\u5185\u30b9\u30b1\u30b8\u30e5\u30fc\u30eb\u30d7\u30ed\u30b8\u30a7\u30af\u30c8\u3067\u3059\u3002<\/p>\n

\u5f53\u793e\u306e\u30b7\u30ea\u30fc\u30ba\u7279\u6b8a\u7528\u9014\u5909\u5727\u5668\u53ca\u3073\u539f\u5b50\u7089\u7528\u30bf\u30ef\u30fc\u30af\u30ec\u30fc\u30f3\u7d0d\u5165\u306e\u4e00\u62ec\u8907\u6570\u306e\u56fd\u5185\u30bf\u30ef\u30fc\u30af\u30ec\u30fc\u30f3\u306eOem. \u691c\u8a3c\u306b\u3088\u308b\u632f\u52d5\u8a66\u9a13\u3001\u9ad8\u4f4e\u6e29\u8a66\u9a13\u30bf\u30a4\u30d7\u8a66\u9a13\u306a\u30bf\u30ef\u30fc\u30af\u30ec\u30fc\u30f3\u306e\u5404\u7a2etonnages\u3001\u88fd\u9020\u3092\u9075\u5b88\u3059\u96fb\u6c17-\u7ba1\u7406\u57fa\u5dfb\u4e0a\u3052\u307e\u3059\u3002 \u5c4a\u3051\u3066\u304f\u308c\u308b\u5b89\u5b9a\u3057\u305f\u96fb\u6e90\u30bd\u30ea\u30e5\u30fc\u30b7\u30e7\u30f3\u306e\u5efa\u8a2d\u5dfb\u4e0a\u6a5f\u5668\u3001\u30d0\u30e9\u30f3\u30b9\u3092\u5b89\u5168\u64cd\u696d\u3001\u5b89\u5b9a\u6027\u3001\u30d5\u30eb\u30e9\u30a4\u30d5\u30b5\u30a4\u30af\u30eb\u30b3\u30b9\u30c8<\/p>","protected":false},"excerpt":{"rendered":"

Tower cranes are tasked with high-altitude lifting of steel bars, formworks, precast components and other heavy materials for main-structure building construction, with operating conditions greatly different from ordinary industrial equipment. Exposed on construction sites, tower cranes are subject to heavy dust, rain and moisture as well as temperature swings of dozens of degrees Celsius between winter and summer. Loads change sharply at the moment of hoisting start-up and braking; slewing and luffing mechanisms keep starting-stopping and reversing directions. Long temporary power-supply cables are shared by multiple high-power construction equipment, giving rise to frequent voltage drop and voltage rise. 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