3HAC157540-004馬達電機可議價
3HAC157540-004馬達電機可議價
3HAC157540-004馬達電機可議價
3HAC157540-004馬達電機參數
3HAC157540-004馬達電機價格
3HAC157540-004馬達電機數據
3HAC157540-004由於電機電樞回路電阻和電感都較小，而轉動體具有·定的機械慣性，因此當電機接通電源後，起動的開始階段電樞轉速以及相應的反電動勢很小，起動電流很大。·大可達額定電流的15∼20倍。
3HAC157540-004這一電流會使電網受到擾動、機組受到機械衝擊、換向器發生火花。因此直接合閘起動只適用於功率不大於4千瓦的電動機（起動電流為額定電流的6∼8倍）。
3HAC157540-004為了限制起動電流，常在電樞回路內串入專門設計的可變電阻，其原理接線見圖1。在起動過程中隨著轉速的不斷升高及時逐級將各分段電阻短接，使起動電流限制在某一允許值以內。這種起動方法稱為串電阻起動，非常簡單，設備輕便，廣泛應用於各種中小型直流電動機中。但由於起動過程中能量消耗大，不適於經常起動的電機和中、大型直流電動機。但對於某些特殊需要，例如城市電車雖經常起動，為了簡化設備，減輕重量和操作維修方便，通常採用串電阻起動方法。
3HAC157540-004對容量較大的直流電動機，通常採用降電壓起動。即由單獨的可調壓直流電源對電機電樞供電，控制電源電壓既可使電機平滑起動，又能實現調速。此種方法電源設備比較復雜。
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