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測功機是什么(測功機的特点)

发表时间：2022-06-01 10:44

　　測功機也称测功器，主要用于测试发动机的功率，也可作为齿轮箱、减速机、变速箱的加载设备，用于测试它们的传递功率。主要分为水力測功機、电涡流測功機、电力測功機。电力測功機利用电机测量各种动力机械轴上输出的转矩，并结合转速以确定功率的设备。因为被测量的动力机械可能有不同转速，所以用作电力測功機的电机必须是可以平滑调速的电机。目前用得较多的是直流測功機、交流測功機和涡流測功機。

2022328

　　工作原理

　　由电涡流測功機结构图可知，感应子主要由旋转部分和摆动部分(电枢和励磁线圈)组成。转子轴上的感应子形状犹如齿轮，与转子同轴装有一个直流励磁线圈。当励磁线圈组通以直流电流时，其周围便有磁场存在，那么围绕励磁组就产生一闭合磁通。很明显，位于绕组左侧的感应子具有一个极性，右侧具有相反的极性。

　　旋轉時，由于磁密值的周期性變化而産生渦流，此渦流産生的磁場同産生它的磁場相互作用，從而産生與被試機反向的制動力矩，使電樞擺動，通過電樞上的力臂，將制動力傳給測量裝置。

　　轉速測量采用非接觸式磁電轉速傳感器和裝于主軸的60齒牙盤，將轉速信號轉換成電信號輸出。

　　優點

　　1、电力測功機测试系统采用DJC交流变频回馈加载，加载能量通过交流负载发电机回馈电网;

　　節能環保。*顯著的節能效果，可使機械能轉換成電能回饋電網

　　2、扭矩、轉速通過扭矩傳感器直接測量;

　　3、電量綜合測量儀表檢測電流、電壓、頻率、功率因數等;計算機自動檢測、顯示並完成數據處理、報表及各種曲線。

　　4、供其他用電設備使用;*良好的雙向加載特性;

　　5、優越的低速加載能力，並且能夠做到高轉速的加載;

　　6、高速的轉矩響應速度(ms級);

　　7、可作爲電動機使用，提供反拖能力;

　　8、可靠性好，使用壽命長，維護方便簡單;

　　9、基礎建設簡單，自身風冷，不需要外部冷卻系統;

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上一篇电力測功機和电涡流測功機区别是什么(电力測功機的优势)

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