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淺析直流電機的機械特性

文章出處:maituwangluo.com  |  發布時間:2020/11/5 14:56:12  |  瀏覽次數:319

淺析直流電機的機械特性
電(dian)動(dong)機(ji)(ji)的(de)(de)轉(zhuan)速n隨轉(zhuan)矩T而變化的(de)(de)特性【n=f(T)】稱為機(ji)(ji)械特性。它是(shi)選用電(dian)動(dong)機(ji)(ji)的(de)(de)一個(ge)重要依據。各類(lei)電(dian)動(dong)機(ji)(ji)都(dou)因(yin)有自己的(de)(de)機(ji)(ji)械特性而適用于不(bu)同的(de)(de)場合。幾種直流電(dian)動(dong)機(ji)(ji)的(de)(de)機(ji)(ji)械特性見(jian)圖2。

調(diao)速(su)  從(cong)直流(liu)電(dian)(dian)(dian)動機的電(dian)(dian)(dian)樞回路(lu)看,電(dian)(dian)(dian)源電(dian)(dian)(dian)壓U與電(dian)(dian)(dian)動機的反電(dian)(dian)(dian)動勢Eа和電(dian)(dian)(dian)樞電(dian)(dian)(dian)流(liu)Zа在電(dian)(dian)(dian)樞回路(lu)電(dian)(dian)(dian)阻Rа上(shang)的電(dian)(dian)(dian)壓降必(bi)須平衡。即U=Ed+IdRd

反電(dian)(dian)動勢又與(yu)電(dian)(dian)動機(ji)的轉(zhuan)速n和(he)(he)磁(ci)通(tong)φ有(you)關,電(dian)(dian)樞(shu)電(dian)(dian)流又與(yu)機(ji)械轉(zhuan)矩(ju)M和(he)(he)磁(ci)通(tong)φ有(you)關。即 z4系列直流電(dian)(dian)動機(ji)

Ed=Cφn

M=CφId式中C

為(wei)常數。由(you)(you)此可(ke)得式(shi)中n0為(wei)空載轉速(su),k 為(wei)Rа/C2。以上是未考慮(lv)鐵心飽和等因(yin)素時的理想(xiang)關系,但(dan)對實際直(zhi)流電(dian)(dian)(dian)動機的分析也(ye)有指導(dao)意義。由(you)(you)上可(ke)見直(zhi)流電(dian)(dian)(dian)動機有3種調(diao)速(su)方法(fa)(fa):調(diao)節(jie)(jie)勵磁電(dian)(dian)(dian)流、調(diao)節(jie)(jie)電(dian)(dian)(dian)樞(shu)端電(dian)(dian)(dian)壓和調(diao)節(jie)(jie)串入(ru)電(dian)(dian)(dian)樞(shu)回(hui)路的電(dian)(dian)(dian)阻。調(diao)節(jie)(jie)電(dian)(dian)(dian)樞(shu)回(hui)路串聯電(dian)(dian)(dian)阻的辦法(fa)(fa)比較簡(jian)便,但(dan)能耗較大;

z4系(xi)列直(zhi)流(liu)(liu)電(dian)(dian)(dian)(dian)動機(ji)(ji)(ji)且在(zai)輕負載(zai)時(shi)(shi),由于負載(zai)電(dian)(dian)(dian)(dian)流(liu)(liu)小,串(chuan)聯(lian)(lian)(lian)電(dian)(dian)(dian)(dian)阻(zu)上電(dian)(dian)(dian)(dian)壓(ya)降小,故(gu)轉(zhuan)速(su)(su)調(diao)節很不(bu)靈敏。調(diao)節電(dian)(dian)(dian)(dian)樞(shu)端(duan)電(dian)(dian)(dian)(dian)壓(ya)并適當(dang)調(diao)節勵磁電(dian)(dian)(dian)(dian)流(liu)(liu),可(ke)(ke)以使直(zhi)流(liu)(liu)電(dian)(dian)(dian)(dian)動機(ji)(ji)(ji)在(zai)寬范圍內平滑地(di)調(diao)速(su)(su)。端(duan)電(dian)(dian)(dian)(dian)壓(ya)加大使轉(zhuan)速(su)(su)升高,勵磁電(dian)(dian)(dian)(dian)流(liu)(liu)加大使轉(zhuan)速(su)(su)降低,二(er)者配合得(de)當(dang),可(ke)(ke)使電(dian)(dian)(dian)(dian)機(ji)(ji)(ji)在(zai)不(bu)同(tong)轉(zhuan)速(su)(su)下運行。調(diao)速(su)(su)中(zhong)應注意高速(su)(su)運行時(shi)(shi),換向(xiang)條件(jian)惡化(hua),低速(su)(su)運行時(shi)(shi)冷卻條件(jian)變壞,從而限制(zhi)了(le)電(dian)(dian)(dian)(dian)動機(ji)(ji)(ji)的(de)(de)功(gong)(gong)率(lv)。串(chuan)勵直(zhi)流(liu)(liu)電(dian)(dian)(dian)(dian)動機(ji)(ji)(ji)由于它的(de)(de)機(ji)(ji)(ji)械特性(圖2)接近恒功(gong)(gong)率(lv)特性,低速(su)(su)時(shi)(shi)轉(zhuan)矩(ju)大,故(gu)廣泛用(yong)于電(dian)(dian)(dian)(dian)動車輛牽引(yin),在(zai)電(dian)(dian)(dian)(dian)車中(zhong)常(chang)用(yong)兩臺或(huo)兩臺以上既有(you)串(chuan)勵又有(you)并勵的(de)(de)復勵直(zhi)流(liu)(liu)電(dian)(dian)(dian)(dian)動機(ji)(ji)(ji)共同(tong)驅動。利用(yong)串(chuan)、并聯(lian)(lian)(lian)改接的(de)(de)方法(fa)使電(dian)(dian)(dian)(dian)機(ji)(ji)(ji)端(duan)電(dian)(dian)(dian)(dian)壓(ya)成倍地(di)變化(hua)(串(chuan)聯(lian)(lian)(lian)時(shi)(shi)電(dian)(dian)(dian)(dian)動機(ji)(ji)(ji)端(duan)電(dian)(dian)(dian)(dian)壓(ya)只有(you)并聯(lian)(lian)(lian)時(shi)(shi)的(de)(de)一半),從而可(ke)(ke)經濟地(di)獲得(de)更大范圍的(de)(de)調(diao)速(su)(su)和(he)減少(shao)起(qi)動時(shi)(shi)的(de)(de)電(dian)(dian)(dian)(dian)能消耗。

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