山東德慶電阻器RF52-160M2-6/2B使直流母線的電壓處在一個安全的范圍以內

電阻器的作用

電阻主要是通過設定一個特定的直流電壓范圍來控制導通和關斷流向制動電阻的電流，使直流母線電壓保持在某一安全范圍以內，從而達到保護變頻調速裝置和電機器件的目的。根據(jù)異步電動機的原理，在一些需要快速降速的應用場合，若滑差越大那么轉矩也會越大，這樣制動轉矩將隨著降速速率的加大而增大，使系統(tǒng)降速的時間也大大縮短，能量的回饋速度也大大加快，直流母線上的電壓會迅速上升，現(xiàn)在我們就需要在在變頻器直流側加入放電電阻單元組件，將產(chǎn)生的能量快速轉換成熱能并消耗掉，使直流母線的電壓處在一個安全的范圍以內。

在電力設施中的應用：

    1、陶瓷管型啟動式線繞電阻器將固定圈數(shù)成形于陶瓷管上，，順著陶瓷管上旋狀牙溝纏繞，該啟動電阻器功率大且堅固，耐高溫、散熱性優(yōu)，電阻溫度系數(shù)小、呈直線變化，適合大電流做短時間過負載時使用，適用于電動機啟動、負載測試、產(chǎn)業(yè)機械、電力分配、儀器設備及自動控制裝置等

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電阻器的選型

   1.在高增益放大電路中.應選用噪聲電動勢小的電阻器，如金屬膜也阻器、碳膜電阻器和線繞電阻器。

   2.針對電路的工作頻率選用不同類堪的電阻器。線繞電阻器的分布參數(shù)較大，即使采用無感繞制的線繞電阻器，其分布參數(shù)也比非線繞電阻器大得多，因而線繞電阻不適合在高頻電路中工作。在低于50kHz 的電路中，由于電阻器的分布參數(shù)對電路工作影響不大，可選用線繞電阻器。

3.在高頻電路中的電阻器，要求其分布參數(shù)越小越好。所以，在高達數(shù)百兆赫的高頻電路中應選用碳膜電阻器、金屬膜電阻器和金屬氧化膜電阻器。在超高頻電路中，應選用超高頻碳膜電阻器。

電阻器的型號

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