一个额定电压380V的三相电机,额定功率4KW,它的额定电流是多少? 4kw电机的额定电流为多大？怎么选配三相电表？
\u56db\u5343\u74e6\u7684\u7535\u673a\u7535\u6d41\u662f\u591a\u5c11\uff0c\u600e\u4e48\u7b97\uff1f\uff08380V50HZ\uff094KW\u7535\u673a\u7684\u989d\u5b9a\u7535\u6d41\u4e3a\uff1a7.15A\u3002
\u53ef\u4ee5\u9009\u7528\u76f4\u63a5\u63a5\u5165\u5f0f\u7684\uff0c\u989d\u5b9a\u7535\u6d4120\uff0880\uff09A\u7684\u7535\u8868\u3002
\u6839\u636e\u4e09\u76f8\u7535\u529f\u7387\u8ba1\u7b97\u516c\u5f0f\uff1aP=\u221a3UIcosa\uff08cosa\u4e3a\u529f\u7387\u56e0\u6570\uff0c\u4e00\u822c\u53d6\u503c0.85\uff09
I=P\u00f7\uff08\u221a3Ucosa\uff09=4000\u00f7\uff081.732\u00d7380\u00d70.85\uff09=7.15\uff08A\uff09
\u6269\u5c55\u8d44\u6599\uff1a
\u6bcf\u4e2a\u7528\u7535\u5668\u90fd\u6709\u4e00\u4e2a\u6b63\u5e38\u5de5\u4f5c\u7684\u7535\u538b\u503c\u53eb\u989d\u5b9a\u7535\u538b\uff0c\u7528\u7535\u5668\u5728\u989d\u5b9a\u7535\u538b\u4e0b\u6b63\u5e38\u5de5\u4f5c\u7684\u529f\u7387\u53eb\u505a\u989d\u5b9a\u529f\u7387\uff0c\u7528\u7535\u5668\u5728\u5b9e\u9645\u7535\u538b\u4e0b\u5de5\u4f5c\u7684\u529f\u7387\u53eb\u505a\u5b9e\u9645\u529f\u7387\u3002
\u4e09\u76f8\u4ea4\u6d41\u7535\u529f\u7387\u8ba1\u7b97\u516c\u5f0f\u662f\uff1aP=\u221a3UIcosa\uff0c\u7535\u6d41I=P\u00f7\uff08\u221a3Ucosa\uff09
\u4e09\u76f8\u7535\u8def\u7684\u603b\u529f\u7387\u3002\u5b83\u7b49\u4e8e\u5404\u76f8\u529f\u7387\u7684\u603b\u548c\u3002\u4e09\u76f8\u7535\u8def\u6709\u5bf9\u79f0\u4e09\u76f8\u7535\u8def\u548c\u4e0d\u5bf9\u79f0\u4e09\u76f8\u7535\u8def\u4e4b\u5206\u3002
\u529f\u7387\u6709\u5e73\u5747\u529f\u7387\uff08\u5373\u6709\u529f\u529f\u7387\uff09\u3001\u65e0\u529f\u529f\u7387\u548c\u89c6\u5728\u529f\u7387\u4e4b\u5206\u3002
\u4e09\u76f8\u8d1f\u8f7d\u7684\u77ac\u65f6\u529f\u7387p=pA+pB+pC=3UpIpcos=P\u3002\u53ef\u89c1\uff0c\u5bf9\u79f0\u4e09\u76f8\u7535\u8def\u4e2d\u4e09\u76f8\u8d1f\u8f7d\u7684\u77ac\u65f6\u529f\u7387\u662f\u4e00\u4e2a\u4e0e\u65f6\u95f4\u65e0\u5173\u7684\u5b9a\u503c\uff0c\u5c31\u7b49\u4e8e\u5e73\u5747\u529f\u7387P\u3002
\u4f7f\u7528\u7535\u80fd\u8868\u65f6\u8981\u6ce8\u610f\uff0c\u5728\u4f4e\u7535\u538b\uff08\u4e0d\u8d85\u8fc7500\u4f0f\uff09\u548c\u5c0f\u7535\u6d41\uff08\u51e0\u5341\u5b89\uff09\u7684\u60c5\u51b5\u4e0b\uff0c\u7535\u80fd\u8868\u53ef\u76f4\u63a5\u63a5\u5165\u7535\u8def\u8fdb\u884c\u6d4b\u91cf\u3002\u5728\u9ad8\u7535\u538b\u6216\u5927\u7535\u6d41\u7684\u60c5\u51b5\u4e0b\uff0c\u7535\u80fd\u8868\u4e0d\u80fd\u76f4\u63a5\u63a5\u5165\u7ebf\u8def\uff0c\u9700\u914d\u5408\u7535\u538b\u4e92\u611f\u5668\u6216\u7535\u6d41\u4e92\u611f\u5668\u4f7f\u7528\u3002
\u53c2\u8003\u8d44\u6599\u6765\u6e90\uff1a\u767e\u5ea6\u767e\u79d1-\u4e09\u76f8\u7535\u8def\u529f\u7387
\u53c2\u8003\u8d44\u6599\u6765\u6e90\uff1a\u767e\u5ea6\u767e\u79d1-\u7535\u5ea6\u8868
绛旓細鎴戜滑瑕佽绠涓涓3KW鐨勪笁鐩哥數鏈鍦380V鐨勭數鍘涓嬶紝鍏舵甯稿伐浣滅殑鐢垫祦澶у皬銆傞鍏堬紝鎴戜滑闇瑕佷簡瑙ｅ姛鐜囥佺數鍘嬪拰鐢垫祦涔嬮棿鐨勫叧绯汇傚姛鐜囷紙P锛夈佺數鍘嬶紙V锛夊拰鐢垫祦锛圛锛変箣闂寸殑鍏崇郴鍙互鐢ㄤ互涓嬬殑鏁板鍏紡琛ㄧず锛歅 = V 脳 I 杩欎釜鍏紡鍛婅瘔鎴戜滑锛岀數鏈虹殑鍔熺巼鏄數鍘嬪拰鐢垫祦鐨勪箻绉傚洜姝わ紝鐢垫祦锛圛锛夊彲浠ヨ〃绀轰负锛欼 = P/V 杩...
绛旓細鐢垫満姣忕浉缁曠粍鐢卞師鏉ュ疄闄呰礋杞鐢靛帇220V鍙樹负380V锛岀粫缁勮礋杞界數鍘嬭繃楂橈紝鐢垫満鐢垫祦杩囧ぇ锛屽嚭鐜扮楗卞拰鑰岃繀閫熷彂鐑儳姣併
绛旓細380V鐨勪笁鐩哥數鏈灞炰簬浜ゆ祦鐢垫満銆備娇鐢ㄧ殑鏄 浜ゆ祦鐢碉紝鐢垫満鏄劅鎬у厓浠躲傚叾璁＄畻鏈夎缁嗙殑鏂规硶銆備笉鑳界敤绠鍗曠殑鐩存祦鐢靛師鐞嗚繘琛岃绠椼備緥濡傦細10kw鐢垫満 鐢垫祦绾18瀹夈傚叾鍔熺巼涓 N=380*1.732*18*0.85=10KW 18涓虹數娴侊紝 0.85涓哄姛鐜囧洜鏁 .
绛旓細380v鐢靛帇涓夌浉鐢涓涓鍗冪摝绛変簬2.63A鐢垫祦銆 鐡︽槸鍔熺巼鍗曚綅锛岀鍙凤細W锛屽崈鐡︽槸鍔熺巼鍗曚綅锛岀鍙凤細KW锛屼竴涓崈鐡=1000鐡︼紝鏍规嵁娆у瀹氬緥鍜岀劍鑰冲畾寰嬬殑鎺ㄨ锛歅=UI锛屽嵆鍔熺巼锛圵锛=鐢靛帇锛圴锛壝楃數娴侊紙A锛夛紝鎺ㄥ嚭鐢垫祦锛圓锛=鍔熺巼锛圵锛壝风數鍘嬶紙V锛夛紝鎵浠ヨ繖閬撻鐨勮绠楁槸锛1000W梅380V鈮2.63A銆
绛旓細宸茬煡棰濆畾鍔熺巼P=132KW锛岀數鍘婾=380V, 鐢垫祦I=260A銆傚疄闄呯數鍘410v锛屾棤娉曟帶鍒剁數娴佸湪260A 璁＄畻鍏紡锛欼锛漃/1.732/U/cos蠁锛132/1.732/0.38/cos蠁 绮剧‘璁＄畻鍏紡鏄細I锛漃/锛1.732xUxcos蠁x畏锛夛紝鍗抽瀹氱數娴佷负鐢垫満鍔熺巼闄や互鏍瑰彿3锛屽啀闄や互鐢垫満鐢靛帇锛屽啀闄や互鍔熺巼鍥犳暟锛屽啀闄や互鏁堢巼銆涓夌浉寮傛鐢靛姩鏈鐢卞浐瀹...
绛旓細涓夎褰㈡帴娉曪紝棰濆畾鐢靛帇涓380浼忕殑涓夌浉鐢靛姩鏈锛屽畠鐨勭浉鐢靛帇涔熸槸380浼忥紝鍚姩鏃舵妸瀹冩帴鎴愭槦褰㈡帴鍒380浼忕數婧愪笂鏃讹紝姣忕浉鐢靛帇鍙湁220浼忥紝姝ゆ椂鐩哥數娴佸彧鏈夊師鏉ョ殑1/鈭3锛岃岀嚎鐢垫祦灏卞彧鏈夊師鏉ョ殑1/3锛岃繖灏遍檷浣庝簡璧峰姩鐢垫祦锛堣捣鍔ㄨ浆鐭╀篃鍙湁鍘熸潵鐨1/3锛夛紱褰撹浆涓轰笁瑙掑舰鎺ユ硶鏃讹紝鐢垫満鍙互宸ヤ綔鍦ㄩ瀹氱姸鎬佷笅銆
绛旓細鏍规嵁浣犵殑鎻忚堪锛涓夌浉寮傛鐢垫満,棰濆畾鐢靛帇涓380V,锛屾槸鍚﹀彲浠ヤ娇鐢ㄩ瀹氬姛鐜5KW锛岀洿鎺ユ帴鍏ョ┖寮闄愭祦15A鐢佃矾涓紝鏄惁鍙互浣跨敤锛屼釜浜鸿瑙ｏ細闇瑕佺湅鐪嬬┖姘斿紑鍏虫槸寤虹瓚鐓ф槑閰嶇數绫诲瀷杩樻槸鍔ㄥ姏鐢垫満閰嶇數绫诲瀷銆傚亣濡傛槸鍓嶈咃細鏍规嵁绌烘皵寮鍏崇殑鑴辨墸鏇茬嚎锛屽強鐢垫満鍚姩鐬棿鐢垫祦鐗规э紝涓鑸湪鍚姩鏃跺氨浼氳烦闂革紙閫夊ぇ鐢垫祦锛屽惎鍔ㄦ椂涓嶈烦闂革紝浣嗘槸璧蜂笉...
绛旓細1銆佷笁鐩稿紓姝ョ數鍔ㄦ満鐨棰濆畾鐢垫祦绾︾瓑浜庯細棰濆畾鍔熺巼锛圞W锛夋暟脳2锛圓锛夈2銆涓夌浉鐢垫満鐨勭數娴佺矖鐣ュ揩閫熶及绠椾负姣廗W=2A锛岃绠楋細I=P/1.732/U/鍔熺巼鍥犳暟=90/1.732/0.38/0.78=175A銆3銆佹墍浠ワ紝90KW鐨勭數鍔ㄦ満鐨勯瀹氱數娴佺害绛変簬175A銆
绛旓細39.5kW锛屼笁鐩稿姛鐜嘩=1.732*鐢垫祦*鐢靛帇=1.732*60*380=39.5鍗冪摝銆備笁鐩歌礋杞界殑鐬椂鍔熺巼p=pA+pB+pc=3UpIpcos=P銆傚彲瑙侊紝瀵圭О涓夌浉鐢佃矾涓笁鐩歌礋杞界殑鐬椂鍔熺巼鏄涓涓涓庢椂闂存棤鍏崇殑瀹氬硷紝灏辩瓑浜庡钩鍧囧姛鐜嘝銆傝嫢璐熻浇鏄涓夌浉鐢靛姩鏈锛岀敱浜庡畠鐨勭灛鏃跺姛鐜囦笉闅忔椂闂存敼鍙橈紝瀹冪殑鐬椂杞煩浜︽槸鎭掑畾鐨勶紝鏁呯數鍔ㄦ満杩愯骞崇ǔ銆傝繖...
绛旓細1銆佸皢涓夋牴鐢电儹绠′竴绔帴涓璧凤紝鍙︿竴绔垎鍒帴浜380v鐨涓夋牴绾夸笂鍗冲彲锛屽涓嬪浘鎵绀猴紱2銆涓夌浉380v鐢垫満闄や簡鍙互鎺ヤ笁鐩220v鐢垫簮锛屽悓鏍峰彲浠ョ敤鏉ユ帴涓夌浉380v鐢垫簮锛屾帴绾挎柟娉曞涓嬪浘锛
