CONTROL TECHNIQUES 已經從EMERSON 集團 轉到 NIDEC 集團旗下，現在銘牌顯示品牌為 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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095UME305BBCAB

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生的脈動磁場，轉子上沒有啟動轉矩而靜止不動。當有控制電壓且控制繞組電流和勵磁繞組電流不同相時，則在氣隙中產生一個旋轉磁場并產生電磁轉矩，使轉子沿旋轉磁場的方向旋轉。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能立即停轉。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轉動，則出現失控現象，我們把這種因失控而自行旋轉的現象稱為自轉。