描述
原起重機系統(tǒng)的防鎦鉤措施。停止到運行。電磁制動器線圈與電動機同時通電。這時,存在以下問題:
對電動機來說,在剛通電瞬間,電磁制動器尚未松開,而電動機已經(jīng)產(chǎn)生了轉(zhuǎn)矩,這必將延長起動過程中大電流存在的時間。
對制動器來說,在松開過程中,必將具有閘瓦與制動輪之間進行滑動摩擦的過程,影響閘瓦的壽命。
運行到停止。使制動器先于電動機0.6s斷電,以確保電動機在制動器已經(jīng)抱住的情況下斷電。這時,對于電動機來說,由于在斷電前制動器已經(jīng)在逐漸地抱緊了,必將加大斷電前的電流。
對于制動器來說,在開始抱緊和電動機斷電之間,在閘瓦與制動輪之間也必有滑動摩擦的過程,影響閘瓦的壽命。
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