制動過程 能耗制動的過程如下： 能耗制動的過程如下：A、當電機在外力作用下減速、反轉時(包括被拖動)，電機即以發電狀態運行，能量反饋回直流回路，使母線電壓升高;B、當直流電壓到達制動單元開的狀態時，制動單元的功率管導通，電流流過制動電阻;C、制動電阻消耗電能為熱能，電機的轉速降低，母線電壓也降低;D、母線電壓降至制動單元要關斷的值，制動單元的功率管截止，制動電阻無電流流過;E、采樣母線電壓值，制動單元重復ON/OFF過程，平衡母線電壓，使系統正常運行。 制動單元與制動電阻的選配 首先估算出制動轉矩 =((電機轉動慣量電機負載測折算到電機測的轉動慣量)*(制動前速度-制動后速度))/375*減速時間-負載轉矩 一般情況下，在進行電機制動時，電機內部存在一定的損耗，約為額定轉矩的18%-22%左右，因此計算出的結果在小于此范圍的話就無需接制動裝置
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