新聞:尉氏縣二相步進(jìn)馬達(dá)FY42EL180A特賣
伺服是一個(gè)閉環(huán)控制系統(tǒng)，而變頻器通常工作于開(kāi)環(huán)控制，所以無(wú)論從速度還是精度上，變頻器都無(wú)法和伺服相比。
其實(shí)變頻只是伺服的一個(gè)部分，伺服是在變頻的基礎(chǔ)上進(jìn)行閉環(huán)的控制從而達(dá)到更理想的效果。
變頻器只是一個(gè)V-F轉(zhuǎn)換，用于控制電機(jī)的一個(gè)器件。而伺服是一個(gè)閉環(huán)的系統(tǒng)。簡(jiǎn)單說(shuō)變頻器主要控制電機(jī)的轉(zhuǎn)速。伺服是既可以控制速度，又可以控制位置和移動(dòng)量，力距，定位，從而達(dá)到、穩(wěn)定，不會(huì)因變頻而產(chǎn)生死機(jī)。伺服不僅能達(dá)到以上的功能，而且產(chǎn)生一個(gè)閉環(huán)的系統(tǒng)，從而避免變頻器產(chǎn)生的輻射。變頻器在變頻過(guò)程中還會(huì)產(chǎn)生大量熱量，造成溫度的提高與聲音，而伺服系統(tǒng)是不會(huì)產(chǎn)生這樣的后果。所以說(shuō)伺服系統(tǒng)的達(dá)到的效果是變頻電機(jī)無(wú)法比擬的。
新聞:尉氏縣二相步進(jìn)馬達(dá)FY42EL180A特賣
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一般為了節(jié)約用水，人們都會(huì)在用洗水液搓手時(shí)關(guān)閉水龍頭，再打開(kāi)時(shí)就會(huì)出現(xiàn)麻煩了，擦了洗水液的手再擰水龍頭比較滑，而且水龍頭也容易沾上洗水液，使用長(zhǎng)久了會(huì)使得水龍頭出現(xiàn)松動(dòng)并且受到腐蝕等等情況。抬啟式只需往上一抬即可出水，可用開(kāi)啟的角度大小來(lái)控制水流，方便衛(wèi)生。感應(yīng)式水龍頭只要把手伸到水龍頭下，便會(huì)自動(dòng)出水，但反應(yīng)遲鈍。使用方便，既衛(wèi)生又節(jié)水。扳手式一般只需旋轉(zhuǎn)9度，可用開(kāi)啟的角度大小來(lái)控制水流?？傊?，不同開(kāi)關(guān)方式的水龍頭具有各自不同的優(yōu)勢(shì)特點(diǎn)，到底選擇什么樣的水龍頭才好呢？這具體還得根據(jù)消費(fèi)者的實(shí)際使用情況進(jìn)行分析。
新聞:尉氏縣二相步進(jìn)馬達(dá)FY42EL180A特賣
從故障診斷到預(yù)測(cè)性維護(hù)
隨著機(jī)器安全標(biāo)準(zhǔn)的不斷發(fā)展，傳統(tǒng)的故障診斷和保護(hù)技術(shù)已經(jīng)落伍，的產(chǎn)品嵌入了預(yù)測(cè)性維護(hù)技術(shù)，使得人們可以通過(guò)Internet及時(shí)了解重要技術(shù)參數(shù)的動(dòng)態(tài)趨勢(shì)，并采取預(yù)防性措施。比如：關(guān)注電流的升高，負(fù)載變化時(shí)評(píng)估尖峰電流，外殼或鐵芯溫度升高時(shí)監(jiān)視溫度傳感器，以及對(duì)電流波形發(fā)生的任何畸變保持警惕。
專用化和多樣化
雖然市場(chǎng)上存在通用化的伺服產(chǎn)品系列，但是為某種特定應(yīng)用場(chǎng)合專門設(shè)計(jì)制造的伺服系統(tǒng)比比皆是。利用磁性材料不同性能、不同形狀、不同表面粘接結(jié)構(gòu)和嵌入式永磁轉(zhuǎn)子結(jié)構(gòu)的電機(jī)出現(xiàn)，分割式鐵芯結(jié)構(gòu)工藝在日本的使用使永磁無(wú)刷伺服電機(jī)的生產(chǎn)實(shí)現(xiàn)了率、大批量和自動(dòng)化，并引起國(guó)內(nèi)廠家的研究。
小型化和大型化
無(wú)論是永磁無(wú)刷伺服電機(jī)還是步進(jìn)電機(jī)都積極向更小的尺寸發(fā)展，比如20，28，35mm外徑;同時(shí)也在發(fā)展更大功率和尺寸的機(jī)種，已經(jīng)看到500KW永磁伺服電機(jī)的出現(xiàn)。體現(xiàn)了向兩極化發(fā)展的傾向。
新聞:尉氏縣二相步進(jìn)馬達(dá)FY42EL180A特賣
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