產(chǎn)品詳情
交流伺服電機(jī)及其調(diào)速分類(lèi)和特點(diǎn)
長(zhǎng)期以來(lái),在要求調(diào)速性能較高的場(chǎng)合,一直占據(jù)主導(dǎo)地位的是應(yīng)用直流電動(dòng)機(jī)的調(diào)速系統(tǒng)。但直流電動(dòng)機(jī)都存在一些固有的缺點(diǎn),如電刷和換向器易磨損,需經(jīng)常維護(hù)。換向器換向時(shí)會(huì)產(chǎn)生火花,使電動(dòng)機(jī)的速度受到限制,也使應(yīng)用環(huán)境受到限制,而且直流電動(dòng)機(jī)結(jié)構(gòu)復(fù)雜,制造困難,所用鋼鐵材料消耗大,制造成本高。而交流電動(dòng)機(jī),特別是鼠籠式感應(yīng)電動(dòng)機(jī)沒(méi)有上述缺點(diǎn),且轉(zhuǎn)子慣量較直流電機(jī)小,使得動(dòng)態(tài)響應(yīng)更好。在同樣體積下,交流電動(dòng)機(jī)輸出功率可比直流電動(dòng)機(jī)提高10﹪~70﹪,此外,交流電動(dòng)機(jī)的容量可比直流電動(dòng)機(jī)造得大,達(dá)到更高的電壓和轉(zhuǎn)速。現(xiàn)代數(shù)控機(jī)床都傾向采用交流伺服驅(qū)動(dòng),交流伺服驅(qū)動(dòng)已有取代直流伺服驅(qū)動(dòng)之勢(shì)。
新聞:灌云縣5相步進(jìn)馬達(dá)23KM-K349B分銷(xiāo)
下面這粒,則是不銹鋼外六角螺絲,價(jià)格相對(duì)鈦合金螺絲來(lái)說(shuō)要好那么一丟丟,但是性能和作用沒(méi)多大的區(qū)別啦。上面這一黑一白,都是汽配螺絲,看起來(lái)雖然簡(jiǎn)單,但是定制的過(guò)程,以及產(chǎn)品的要求可是不簡(jiǎn)單。汽配螺絲有別于其他普通螺絲,在強(qiáng)度和精度上,其機(jī)械性能從4.6級(jí)到1.9級(jí)的各個(gè)級(jí)別扭力也有不同的標(biāo)準(zhǔn),螺絲的螺紋直徑和螺距都有對(duì)應(yīng)的標(biāo)準(zhǔn)。所以找汽配螺絲的生產(chǎn)廠家,還是要注重廠家的生產(chǎn)實(shí)力和經(jīng)驗(yàn),這樣才能在品質(zhì)上達(dá)到汽車(chē)配件的標(biāo)準(zhǔn)。
新聞:灌云縣5相步進(jìn)馬達(dá)23KM-K349B分銷(xiāo)
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伺服就是一個(gè)提供閉環(huán)反饋信號(hào)來(lái)控制位置和轉(zhuǎn)速,伺服電機(jī)驅(qū)動(dòng)器接收電機(jī)編碼器的反饋信號(hào),并和指令脈沖進(jìn)行比較,從而構(gòu)成了一個(gè)位置的半閉環(huán)控制,使被控系統(tǒng)工作在設(shè)定狀態(tài)。
可以這樣假設(shè),把伺服驅(qū)動(dòng)器假設(shè)為變頻器,把伺服電機(jī)設(shè)為普通的異步電機(jī)即可,換言之,伺服驅(qū)動(dòng)器可以根據(jù)我們的需要設(shè)定功能參數(shù)并發(fā)送給伺服電機(jī),伺服電機(jī)就會(huì)按照伺服驅(qū)動(dòng)器功能參數(shù)的設(shè)定值來(lái)進(jìn)行工作,只不過(guò)伺服驅(qū)動(dòng)器與伺服電機(jī)這個(gè)組合的控制精度要遠(yuǎn)大于變頻器與普通電機(jī)的組合。
交流伺服的發(fā)展借鑒并應(yīng)用了變頻的技術(shù),在直流電機(jī)的伺服控制的基礎(chǔ)上通過(guò)變頻PWM方式模仿直流電機(jī)的控制方式來(lái)實(shí)現(xiàn)的,也就是說(shuō)交流伺服電機(jī)必然有變頻的這一環(huán)節(jié)。與變頻器一樣,也是將工頻交流電先整流成直流電,然后通過(guò)可控制門(mén)極的各類(lèi)晶體管(IGBT,IGCT等)通過(guò)載波頻率和PWM調(diào)節(jié)逆變?yōu)轭l率可調(diào)的交流電,波形類(lèi)似于正余弦的脈動(dòng)電。進(jìn)行了比一般變頻更的控制技術(shù)和算法運(yùn)算,主要的一點(diǎn)可以進(jìn)行的位置控制。
新聞:灌云縣5相步進(jìn)馬達(dá)23KM-K349B分銷(xiāo)
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新聞:灌云縣5相步進(jìn)馬達(dá)23KM-K349B分銷(xiāo)
一般人很難分辨。替代木材加工而成的泰柚貼面板,常用的是斑馬木,該木材的顏色和泰柚比較相近,但木紋不清晰,沒(méi)有泰柚特有的黑金線條。實(shí)際上真正的天然泰柚貼面板其質(zhì)地、紋理都和假冒柚木板不同。如果你要選購(gòu)的泰柚裝飾板,小編建議你不妨從如下幾個(gè)方面進(jìn)行考慮吧。手感:天然柚木板表面光滑細(xì)膩,摸上去感覺(jué)舒服,而偽造產(chǎn)品則較為粗糙。氣味:柚木材質(zhì)散發(fā)出一種酸味,而其他材質(zhì)一般無(wú)此氣味。水試驗(yàn):灑少量水于柚木板表面,若水分未吸濕,而呈水珠狀,則表示為真正的天然柚木產(chǎn)品,因柚木材料表面張力大,又帶有油性,所以不易吸濕、發(fā)潮。