西門子產品6ES7314-6CH04-0AB0

所在地: 福建省 廈門市
發布時間: 2025-03-17
詳細信息

6ES7314-6CH04-0AB0

直流伺服電動機的轉速控制通常採用脈寬調制 PWM方式,如左圖所示,方波控制信號Vb控制晶體管VT的通斷,也就是控制電源電壓的通斷。Vb 為高電平時,晶體管VT導通,電源電壓施加在電動機上,產生電流im。由於電動機的繞組是感性負載,電流im有一個上升過程。Vb為低電平時,晶體管VT斷開,電源電壓斷開,但是電動機繞組中存儲的電能釋放出來,產生電流 im,電流 im 有一個下降的過程。

佔空比就是在一段連續工作時間內脈衝(高電平)佔用的時間與總時間的比值。直流電動機就是靠控制脈衝信號的佔空比來調速的。當控制脈衝信號的佔空比是60%時,也就是高電平佔總時間的 60%時,施加在電動機定子繞組上的平均電壓是 0.6U,當係統穩定運行時,電動機繞組中的電流平均值也是峰值的0.6。顯然控制信號的佔空比決定了施加在電動機上的平均電流和平均電壓,也就控制了電動機的轉速。無刷直流電動機的電流曲


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