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6SN1118-0DM33-0AA1的構(gòu)造基本上與電容分相式單相異步電動機相似.其定子上裝有兩個位置互差90°的繞組,，一個是勵磁繞組Rf，它始終接在交流電壓Uf上,；另一個是控制繞組L,，聯(lián)接控制信號電壓Uc。所以交流伺服電動機又稱兩個伺服電動機,。交流伺服電動機的轉(zhuǎn)子通常做成鼠籠式,，但為了使伺服電動機具有較寬的調(diào)速范圍、線性的機械特性,，無“自轉(zhuǎn)”現(xiàn)象和快速響應(yīng)的性能,，它與普通電動機相比，應(yīng)具有轉(zhuǎn)子電阻大和轉(zhuǎn)動慣量小這兩個特點,。目前應(yīng)用較多的轉(zhuǎn)子結(jié)構(gòu)有兩種形式：一種是采用高電阻率的導(dǎo)電材料做成的高電阻率導(dǎo)條的鼠籠轉(zhuǎn)子,，為了減小轉(zhuǎn)子的轉(zhuǎn)動慣量，轉(zhuǎn)子做得細(xì)長,；另一種是采用鋁合金制成的空心杯形轉(zhuǎn)子,，杯壁很薄，僅0.2-0.3mm,，為了減小磁路的磁阻,，要在空心杯形轉(zhuǎn)子內(nèi)放置固定的內(nèi)定子.空心杯形轉(zhuǎn)子的轉(zhuǎn)動慣量很小，反應(yīng)迅速,，而且運轉(zhuǎn)平穩(wěn),，因此被廣泛采用。交流伺服電動機在沒有控制電壓時,，定子內(nèi)只有勵磁繞組產(chǎn)生的脈動磁場,，轉(zhuǎn)子靜止不動。當(dāng)有控制電壓時,，定子內(nèi)便產(chǎn)生一個旋轉(zhuǎn)磁場,，轉(zhuǎn)子沿旋轉(zhuǎn)磁場的方向旋轉(zhuǎn)，在負(fù)載恒定的情況下,，電動機的轉(zhuǎn)速隨控制電壓的大小而變化,，當(dāng)控制電壓的相位相反時，伺服電動機將反轉(zhuǎn)。SIEMENS伺服電動機的工作原理與分相式單相異步電動機雖然相似,，但前者的轉(zhuǎn)子電阻比后者大得多,，所以6SN1118-0DM33-0AA1伺服電動機與單機異步電動機相比，有三個顯著特點：
1,、起動轉(zhuǎn)矩大 由于轉(zhuǎn)子電阻大,，其轉(zhuǎn)矩特性曲線如圖3中曲線1所示，與普通異步電動機的轉(zhuǎn)矩特性曲線2相比,，有明顯的區(qū)別,。它可使臨界轉(zhuǎn)差率S0>1，這樣不僅使轉(zhuǎn)矩特性（機械特性）更接近于線性,，而且具有較大的起動轉(zhuǎn)矩,。因此，當(dāng)定子一有控制電壓,，轉(zhuǎn)子立即轉(zhuǎn)動,，即具有起動快、靈敏度高的特點,。
2,、運行范圍較廣
3、無自轉(zhuǎn)現(xiàn)象 正常運轉(zhuǎn)的伺服電動機,，只要失去控制電壓,，電機立即停止運轉(zhuǎn)。當(dāng)伺服電動機失去控制電壓后,，它處于單相運行狀態(tài),，由于轉(zhuǎn)子電阻大，定子中兩個相反方向旋轉(zhuǎn)的旋轉(zhuǎn)磁場與轉(zhuǎn)子作用所產(chǎn)生的兩個轉(zhuǎn)矩特性（T1－S1,、T2－S2曲線）以及合成轉(zhuǎn)矩特性（T－S曲線）
交流伺服電動機的輸出功率一般是0.1-100W,。當(dāng)電源頻率為50Hz，電壓有36V,、110V,、220、380V,；當(dāng)電源頻率為400Hz,，電壓有20V、26V,、36V,、115V等多種。
交流伺服電動機運行平穩(wěn),、噪音小,。但控制特性是非線性,，并且由于轉(zhuǎn)子電阻大，損耗大,，效率低,，因此與同容量直流伺服電動機相比，體積大,、重量重,，所以只適用于0.5-100W的小功率控制系統(tǒng)。
In fact, you know, this is just the most profitable case of rabies revenge willow with royal masterminded, he originally came to Ting under his brother and brother, now by feeding the dog bite, died, the principal home right in one fell swoop. Others thought it was just a rabies bite, and could not catch anything. It made people have to sit up and take a look at the usual cynicism.
But Liu Yu was in a phase to buy goods after the ship disappeared, until the survivors of the ship back to Liu Jia said: "news, three young master suddenly mad after a dog after beating hard ships, the ship could not afford to swing in a wave rushed to sink three, God is also missing." When three of his sons died, one wounded and one lost, the badly battered Liucheng was wrong.
Liu‘s revenge was dog rumors spread like wildfire, Liu Xiangxun survived the reaction quickly blocked messages and the public rumor, stability of Dingzhou Liu home position. Faced with such a capable t w o son, Liucheng ac c identally delayed his family, and even did not let him participate in any of Liu‘s affairs.
6SN1118-0DM33-0AA1
化工儀器網(wǎng)