有一台三相异步电动机,额定功率为13千瓦,三角形连接,线电压380伏,功率因数为0、88效率为0、88怎样算相电流 有一台三相异步电动机,额定功率为7.5千瓦,额定电压380v...
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\u5176\u4e2d\uff0cP\u2014\u662f\u7535\u52a8\u673a\u8f74\u8f93\u51fa\u529f\u7387
U\u2014\u662f\u7535\u52a8\u673a\u7535\u6e90\u8f93\u5165\u7684\u7ebf\u7535\u538b
I\u2014\u662f\u7535\u52a8\u673a\u7535\u6e90\u8f93\u5165\u7684\u7ebf\u7535\u6d41
COS\u03c6\u2014\u662f\u7535\u52a8\u673a\u7684\u529f\u7387\u56e0\u6570
2\u3001\u7535\u52a8\u673a\u7684\u8f93\u51fa\u529f\u7387\uff1a\u6307\u7684\u662f\u7535\u52a8\u673a\u8f74\u8f93\u51fa\u7684\u673a\u68b0\u529f\u7387
3\u3001 \u8f93\u5165\u529f\u7387\u6307\u7684\u662f\uff1a\u7535\u6e90\u7ed9\u7535\u52a8\u673a\u8f93\u5165\u7684\u6709\u529f\u529f\u7387 \uff1a
P=\u221a3*U*I*COS\u03c6\uff08KW\uff09
\u5176\u65f6\uff0c\u8fd9\u4e2a\u95ee\u9898\u6709\u4e9b\u542b\u7cca\uff0c\u6309\u8bf4\u7535\u52a8\u673a\u7684\u8f93\u5165\u529f\u7387\u5e94\u8be5\u6307\u7684\u662f\u7535\u6e90\u8f93\u5165\u7684\u89c6\u5728\u529f\u7387\uff1aS==\u221a3*U*I \u8fd9\u4e2a\u89c6\u5728\u529f\u7387\u5305\u62ec\u6709\u529f\u529f\u7387(\u7535\u52a8\u673a\u7684\u673a\u68b0\u635f\u8017\u3001\u94dc\u635f\u3001\u94c1\u635f\u7b49)\u3001\u65e0\u529f\u529f\u7387\u3002
7.5/9.8=76%
\u529f\u73877.5\u5343\u74e6
\u7535\u538b380v
\u529f\u7387\u56e0\u65700.85
\u6548\u73870.87
P= 1.732 X U X I X COS\u03c6 X \u03b7
\u7535\u673a\u7684\u7535\u6d41 I = 7500 /(1.732 X 380 X 0.85 X 0.87) =15.41 A
功率除以电压除以三的根号除以功率因数除以效率,13000/380/1.732/0.88/0.88~约等于25.5安电流
p=根号3*U*I*功率因数
I=13KW/(1.732*380*0.88)=13KW/579=22.5A
一个千瓦双两安吧 就是26安
绛旓細鍚屾杞焠1=60f/p=3000/3=1000r/min锛岃浆宸巼s=(n1-n)/n1=(1000-950)/1000=0.05锛涙晥鐜囄=Pn/(Pn+螖P)脳100锛=28/锕28+2.2+1.1+0.186)脳100锛=89锛呫涓夌浉浜ゆ祦寮傛鐢靛姩鏈鐨勬晥鐜囪秺楂橈紝鍏惰浆宸巼瓒婂皬銆備篃鍗冲湪棰濆畾棰戠巼涓庣數鍘嬩笅锛岀浉鍚岃礋杞界殑杞熻秺楂樸傚浜庢煇浜鍔熺巼涓庤浆閫熸垚姝ｆ瘮锛岀敋鑷...
绛旓細3銆佸畾瀛愮數娴両n=锕28+2.2+1.1+0.186)/1.732/0.38/0.85/0.89=63.2A 璁鍔熺巼鍥犳暟涓0.85
绛旓細绌哄帇閲囩敤瑗块棬瀛3UT绯诲垪锛20-35A 鍙傛暟鍙互璋冨湪27鍒28A灏卞ソ浜
绛旓細锛3锛鐢靛姩鏈洪瀹杩愯鏃惰緭鍏鍔熺巼涓哄灏戯紵---杈撳叆鍔熺巼Pr=Pc/畏=10/0.9=11.11KW銆
绛旓細鍔熺巼7.5鍗冪摝 鐢靛帇380v 鍔熺巼鍥犳暟0.85 鏁堢巼0.87 P= 1.732 X U X I X COS蠁 X 畏 鐢垫満鐨勭數娴 I = 7500 /(1.732 X 380 X 0.85 X 0.87) =15.41 A
绛旓細棣栧厛锛屾垜浠潵瀹氫箟涓浜涘彉閲忥細P_n = 棰濆畾鍔熺巼 = 28kWU_n = 棰濆畾鐢靛帇 = 380Vf_n = 棰濆畾棰戠巼 = 50Hzn_n = 棰濆畾杞 = 950r/minP_Cu + P_Fe = 閾滆楀強閾佽 = 2.2kWP_m = 鏈烘鎹熻 = 1.1kWP_add = 闄勫姞鎹熻 = 186W 杞樊鐜囩殑璁＄畻锛氳浆宸巼 s 鍙互鐢变互涓嬪叕寮忚绠楋細s = (n_n...
绛旓細1銆涓夌浉浜ゆ祦寮傛鐢靛姩鏈鐨勬晥鐜囷細畏=P/锛堚垰3*U*I*COS蠁锛夊叾涓紝P鈥旀槸鐢靛姩鏈鸿酱杈撳嚭鍔熺巼 U鈥旀槸鐢靛姩鏈虹數婧愯緭鍏ョ殑绾跨數鍘 I鈥旀槸鐢靛姩鏈虹數婧愯緭鍏ョ殑绾跨數娴 COS蠁鈥旀槸鐢靛姩鏈虹殑鍔熺巼鍥犳暟 2銆佺數鍔ㄦ満鐨勮緭鍑哄姛鐜囷細鎸囩殑鏄數鍔ㄦ満杞磋緭鍑虹殑鏈烘鍔熺巼 3銆 杈撳叆鍔熺巼鎸囩殑鏄細鐢垫簮缁欑數鍔ㄦ満杈撳叆鐨勬湁鍔熷姛鐜 锛歅=鈭3*...
绛旓細涓鍙颁笁鐩稿紓姝ョ數鍔ㄦ満鐨勯瀹氭暟鎹负棰濆畾鍔熺巼PN=15KW锛岄瀹鐢靛帇UN=380V锛岃绠楅瀹氱數娴佷负锛氳冭檻鍔熺巼鍥犳暟0.79锛屾晥鐜88%锛屽洜姝ら瀹氱數娴佷负32.78A銆傛棰樼殑鍔熺巼鍥犳暟鍜屾晥鐜囬兘鏄亣瀹氬硷紝鎵浠ョ數娴佽绠椾篃鏄繎浼煎笺
绛旓細鐢靛姩鏈鐨勯瀹氱數娴=棰濆畾鍔熺巼涓22kW/棰濆畾鐢靛帇涓380V/1.732/鍔熺巼鍥犵礌涓0.86=38.9A
绛旓細璁棰濆畾鍔熺巼鍥犳暟cos=0.8 棰濆畾鐢垫祦=15*10^3/(鏍瑰彿3*380*0.8)=28.5A 棰濆畾杈撳叆鍔熺巼=15/0.882=17kW
