外文翻譯---雙閉環(huán)直流調(diào)速系統(tǒng)的說明-其他專業(yè)(參考版)
2025-01-23 09:23本頁面
【正文】 。 （ 8） 控制精度不夠在以分配器為給定的外部控制運(yùn)行時(shí) ,往往要求有足夠的停車精度 ,才能正常工作 .如果停車精度差 ,可以適當(dāng)調(diào)整速度調(diào)節(jié)器的ＰＩ環(huán)節(jié) ,一般通過減小比例部分 ,加大積分部分即可得到滿 意的效果。,此時(shí)整流系統(tǒng)輸出電壓為零 ,電機(jī)將不再爬行。 （ 5）整流橋輸出電壓調(diào)不高 1)速度調(diào)節(jié)器、電流調(diào)節(jié)器限幅偏小 ,應(yīng)根據(jù)情況適當(dāng)放開限幅值 . 2)速度反饋信號(hào)過強(qiáng) ,可適當(dāng)減小速度反饋信號(hào)。 （ 3）速度不穩(wěn)造成速度不穩(wěn)的因素較多 : 1)測速電機(jī)固定不牢固或與主機(jī)不同軸 . 2)速度調(diào)節(jié)器的參數(shù)不合適 .應(yīng)對(duì)動(dòng)態(tài)參數(shù)進(jìn)行調(diào)整 (改變比例、積分參數(shù) ). 3)調(diào)速系統(tǒng)的某個(gè)環(huán)節(jié)有虛焊 (或接觸不良 ). 畢業(yè)設(shè)計(jì) （外文 翻譯 ） 10 4)可能由于干擾引起 .應(yīng)查出干擾原因 ,采取抗干擾措施。 （ 1） 電源電壓正常 ,可控硅整流橋輸出波形不齊造成這種現(xiàn)象的原因是由于觸發(fā)器鋸齒波斜率不一致而引起的 .適當(dāng)調(diào)節(jié)鋸齒波斜率電位器 ,便可達(dá)到輸出波形整齊 .在調(diào)整過程中要兼顧齊 ,這一點(diǎn)在實(shí)際調(diào)試中應(yīng)注意。 （ 2） .雙閉環(huán)調(diào)速系統(tǒng)的典型工作狀態(tài) 1）起動(dòng) (或升速 ): 在起動(dòng)過程中ＳＴ一直是飽和 ,這樣相當(dāng)于使速度環(huán)處于開環(huán)狀態(tài) .系統(tǒng)只在電流環(huán)的恒值調(diào)節(jié)作用之下 ,保證電動(dòng)機(jī)在恒定的最大允許電流下起動(dòng)。這個(gè)作 用對(duì)昨天的可靠運(yùn)行來說是十分重要的。 4）當(dāng)電動(dòng)機(jī)過載甚至堵轉(zhuǎn)時(shí)，限制電樞電流的最大值，起加速的自動(dòng)保護(hù)作用。 2）對(duì)電網(wǎng)電壓的波動(dòng)起及時(shí)抗擾的作用。 2) 其輸出限幅值決定電動(dòng)機(jī)允許的最大電流。 轉(zhuǎn)速調(diào)節(jié)器和電流調(diào)節(jié)器在雙閉環(huán)直流調(diào)速系統(tǒng)中的作用可歸納如下： （ 1） .轉(zhuǎn)速調(diào)節(jié)器的作用 轉(zhuǎn)速調(diào)節(jié)器是調(diào)速系統(tǒng)的主導(dǎo)調(diào)節(jié)器，它使轉(zhuǎn)速 n很快隨給定電壓變化 Un*變化，穩(wěn)態(tài)時(shí)可減小轉(zhuǎn)速誤差，如果采用 PI調(diào)節(jié)器，則可實(shí)現(xiàn)無靜差 。 （ 4）為什么用積分控制的調(diào)速系統(tǒng)是無靜差的？ 答：在積分調(diào)節(jié)器的調(diào)速系統(tǒng)中 ，能實(shí)現(xiàn)無靜差，是由于積分調(diào)節(jié)器控制特點(diǎn)，即積分的記憶和積累作用。 （ 3）在轉(zhuǎn)速、電流雙閉環(huán)調(diào)速系統(tǒng)中，兩個(gè)調(diào)節(jié)器均采用 PI調(diào)節(jié)器。 （ 2）轉(zhuǎn)速、電流雙閉環(huán)調(diào)速系統(tǒng)穩(wěn)態(tài)運(yùn)行時(shí)，兩個(gè)調(diào)節(jié)器的輸入偏差電壓和輸出電壓各是多少？ 答：轉(zhuǎn)速、電流雙閉環(huán)調(diào)速系統(tǒng)穩(wěn)態(tài)運(yùn)行時(shí)，兩個(gè)調(diào)節(jié)器的輸入偏差電壓均是零，由式子 ? n=Un=Un*， n=n0 。, at this time to zero output voltage rectification system, the electrical will not crawl. (7) With a given system can not run Should first check whether it is normal for the external control system, such as outside the normal control system, it may be given points, speed regulator, current regulator, such as caused by link failure. Shall be cut off main circuit power supply, only the control system to the electricity, not Add the given circumstances, the key points of each test (such as the current regulator, voltage regulator, etc.) of the potential. and then bined with a given, after the previous one by one to each of the key points to check the potential changes, that is, where to find fault. (8) Lack of control accuracy in the distributor for a given runtime external control often requires precision sufficient parking in order to work properly. If poor precision parking, you can adjust the speed of the appropriate regulator of the PI link, generally by reducing the the ratio of the integral part of efforts to get satisfactory results. (9) Reversible system oscillation 1) openloop system in the state (the main circuit disconnect) the oscillation ca n be changed at this time given the previous inspection to the key points of the potential changes. If a given unchanged, but the potential is still a point of change, here is the crux of . 2) system in the state when the closedloop oscillation, in which case in order to ensure the safety of the electrical load should be replaced by the general resistance of the load, if there is no suitable resistance box which can be used in place of the two electric subseries. inspection methods and similar openloop, focusing on the link to check is: given points, level detection, operation control, such as the speed regulator. oscillations are often caused as a result of operational amplifiers, such as damage to electronic 畢業(yè)設(shè)計(jì) （外文 翻譯 ） 6 ponents , system parameters caused by improper, according to the
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