CONTROL TECHNIQUES 已經(jīng)從EMERSON 集團 轉(zhuǎn)到 NIDEC 集團旗下，現(xiàn)在銘牌顯示品牌為 NIDEC

055UDA305BACRA063110: Unimotor HD系列 伺服電機, 電壓:460VAC, 55mm 機座規(guī)格, 6.2lb-in (0.7Nm), 0.97A, 3krpm, Inc. Enc. 4096ppr,是否帶剎車：是，帶**剎車, size 1.0 power, 90° rot. conns, Key installed, std inertia, 63mm BCD,11mm shaft dia.

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交流伺服電動機在沒有控制電壓時，氣隙中只有勵磁繞組產(chǎn)生的脈動磁場，轉(zhuǎn)子上沒有啟動轉(zhuǎn)矩而靜止不動。當有控制電壓且控制繞組電流和勵磁繞組電流不同相時，則在氣隙中產(chǎn)生一個旋轉(zhuǎn)磁場并產(chǎn)生電磁轉(zhuǎn)矩，使轉(zhuǎn)子沿旋轉(zhuǎn)磁場的方向旋轉(zhuǎn)。但是對伺服電動機要求不僅是在控制電壓作用下就能啟動，且電壓消失后電動機應(yīng)能立即停轉(zhuǎn)。如果伺服電動機控制電壓消失后像一般單相異步電動機那樣繼續(xù)轉(zhuǎn)動，則出現(xiàn)失控現(xiàn)象，我們把這種因失控而自行旋轉(zhuǎn)的現(xiàn)象稱為自轉(zhuǎn)。