本公司供應(yīng)全新羅克韋爾1398-DDM-150伺服驅(qū)動(dòng)器ALLEN BRADLEY，價(jià)格優(yōu)惠，快速交貨，
型號(hào)
:白山2098-DSD-020-DN羅克韋爾伺服驅(qū)動(dòng)器
Allen Bradley 1398-DDM-009-DN
Allen Bradley 1398-DDM-005X-NV
Allen Bradley 1398-DDM-005X-DN
Allen Bradley 1398-DDM-009X
Allen Bradley 1398-DDM-019-DN
Allen Bradley 1398-DDM-009X-DN
Allen Bradley 1398-DDM-005X
Allen Bradley 1398-DDM-005-DN
Allen Bradley 1398-DDM-005
Allen Bradley 1398-DDM-075X
Allen Bradley 1398-DDM-075
Allen Bradley 1398-DDM-010X
Allen Bradley 1398-DDM-010
Allen Bradley 1398-DDM-150
Allen Bradley 1398-DDM-020X
Allen Bradley 1398-DDM-020
Allen Bradley 1398-DDM-030X
Allen Bradley 1398-DDM-030
Allen Bradley 1398-DDM-019X-DN
Allen Bradley 1398-DDM-019X
Allen Bradley 1398-DDM-150X
Allen Bradley 1398-DDM-019
Allen Bradley 1398-DDM-009
:白山2098-DSD-020-DN羅克韋爾伺服驅(qū)動(dòng)器，所示電路，按瞬時(shí)極性法判斷。設(shè)同相輸入端u+有一瞬時(shí)增量，則輸出uo為，經(jīng)電阻Rf返送至反相輸入端，使u-為，即反饋信號(hào)的瞬時(shí)極性為。其次，比較反饋信號(hào)與輸入信號(hào)的瞬時(shí)極性來判斷電路引入的是正反饋還是負(fù)反饋。當(dāng)輸入信號(hào)和反饋信號(hào)不在同一節(jié)點(diǎn)引入(其中一個(gè)節(jié)點(diǎn)為基極,另一個(gè)節(jié)點(diǎn)為發(fā)射極，或不同輸入端)))如差動(dòng)放大電路、集成運(yùn)算放大電路等)時(shí),若兩者的瞬時(shí)極性相同，則為負(fù)反饋；兩者的瞬時(shí)極性相反，則為正反饋。
