描述

T8151B

三相異步電動(dòng)機(jī)轉(zhuǎn)速公式為：n=60f/p(1-s)
f代表電源頻率
P為極對(duì)數(shù)
n’代表轉(zhuǎn)差率
s代表轉(zhuǎn)差率
三相異步電動(dòng)機(jī)轉(zhuǎn)速是分級(jí)的，是由電機(jī)的“極數(shù)”決定的。
三相異步電動(dòng)機(jī)“極數(shù)”是指定子磁場(chǎng)磁極的個(gè)數(shù)。定子繞組的連接方式不同，可形成定子磁場(chǎng)的不同極數(shù)。選擇電動(dòng)機(jī)的極數(shù)是由負(fù)荷需要的轉(zhuǎn)速來(lái)確定的。電動(dòng)機(jī)的電流只跟電動(dòng)機(jī)的電壓、功率有關(guān)系。
三相交流電機(jī)每組線圈都會(huì)產(chǎn)生N、S磁極，每個(gè)電機(jī)每相含有的磁極個(gè)數(shù)就是極數(shù)。由于磁極是成對(duì)出現(xiàn)的，所以電機(jī)有2、4、6、8……極之分。
在中國(guó)，電源頻率為50赫，所以二極電機(jī)的同步轉(zhuǎn)速為3000轉(zhuǎn)/分，四極電機(jī)的同步轉(zhuǎn)速為1500轉(zhuǎn)/分，以此類推。異步電機(jī)轉(zhuǎn)子的轉(zhuǎn)速總是低于或高于其旋轉(zhuǎn)磁場(chǎng)的轉(zhuǎn)速，異步之名由此而來(lái)。異步電機(jī)轉(zhuǎn)子轉(zhuǎn)速與旋轉(zhuǎn)磁場(chǎng)轉(zhuǎn)速之差（稱為轉(zhuǎn)差）通常在10%以內(nèi)。
因?yàn)槿绱?，所以三相異步電?dòng)機(jī)的實(shí)際轉(zhuǎn)速會(huì)比上述的同步轉(zhuǎn)速偏低。如6的同步轉(zhuǎn)速為1000轉(zhuǎn)，其實(shí)際轉(zhuǎn)速一般為960轉(zhuǎn)/分鐘。

更引人注目的是,以上示圖中,首例利用人機(jī)接口-觸摸屏COM2 (DELTA公司的人機(jī)接口INTERFACE為2S/1P)口與三臺(tái)變頻器直接通訊,徹底擺脫了”變頻器 PLC 觸摸屏”的傳統(tǒng)模式.該系統(tǒng)精心大膽的設(shè)計(jì),主要利用了DELTA公司人機(jī)接口的宏功能(綜合數(shù)據(jù)處理﹑邏輯運(yùn)算﹑通訊等功能),用軟件開(kāi)放出一自由協(xié)議口,使不同協(xié)議的智能單元能夠在一個(gè)控制平臺(tái)上實(shí)現(xiàn)相對(duì)統(tǒng)一和整合,同時(shí)減輕了同一總線上的通訊負(fù)荷和風(fēng)險(xiǎn).在實(shí)際應(yīng)用中關(guān)于變頻﹑PLC﹑人機(jī)接口在氣流紡的應(yīng)用接口在氣流紡的應(yīng)用接口在氣流紡的應(yīng)用該系統(tǒng)的引紗﹑喂給電機(jī)的頻率及相互匹配系數(shù),可直接通過(guò)觸摸面板快捷地調(diào)整和電流的實(shí)時(shí)監(jiān)控,并且使線上所有10多臺(tái)PLC程序嚴(yán)格的一致,增加了PLC應(yīng)急互換性,實(shí)現(xiàn)了多層控制單一化,復(fù)雜簡(jiǎn)單化.

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