新聞:東坑鎮(zhèn)數(shù)控車床專用步進電機BG57BYGH112-4204性價比
無刷直流電機基本控制方法:
無刷直流電機的轉(zhuǎn)子磁鋼呈瓦片形,磁極與定子繞組間氣隙均勻,氣隙磁場呈梯形分布。定子繞組感應(yīng)電動勢波形為梯形波。
無刷直流電機定子繞組通常采用三相星形接法,需要應(yīng)用三相全橋控制電路,其驅(qū)動控制系統(tǒng)結(jié)構(gòu)如圖1所示。
由V1~V6六只功率管構(gòu)成的驅(qū)動全橋可以控制繞組的通電狀態(tài)。按照功率管的通電方式,可以分為兩兩導(dǎo)通和三三導(dǎo)通兩種控制方式。由于兩兩導(dǎo)通方式提 供了更大的電磁轉(zhuǎn)矩而被廣泛采用。在兩兩導(dǎo)通方式下,每一瞬間有兩個功率管導(dǎo)通,每隔1/6周期即60°電角度換相一次,每只功率管持續(xù)導(dǎo)通 120°電角度,對應(yīng)每相繞組持續(xù)導(dǎo)通120°,在此期間相電流方向保持不變。為保證產(chǎn)生的電磁轉(zhuǎn)矩,通常需要使繞組合成磁場與轉(zhuǎn)子 磁場保持垂直。由于采用換相控制方式,其定子繞組產(chǎn)生的是跳變的磁場,使得該磁場與轉(zhuǎn)子磁場的位置保持在60°~120°相對垂直的范圍區(qū)間。

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新聞:東坑鎮(zhèn)數(shù)控車床專用步進電機BG57BYGH112-4204性價比

為提率,燒成爐溫度是96~98℃。底釉的燒成必須精心掌握好時間,即不能燒成不足(俗稱燒得生),更不能燒過(俗稱火大)。前者密著不好,后者會燒損底釉。燒成適度的底釉應(yīng)該是色澤均勾,表面平滑光亮,無氣泡。頭遍底釉燒好后,如質(zhì)量合格即可進行噴搪面釉;如果不合格就要進行修磨,燒損嚴重時需要噴搪第二遍底釉。當噴搪第二遍底釉時,不能噴得太厚,要使兩遍底釉的總厚度控制在35m以下。再厚了就要影響面釉層的有效厚度了。
新聞:東坑鎮(zhèn)數(shù)控車床專用步進電機BG57BYGH112-4204性價比
行星齒輪減速器-行星齒輪減速器齒輪承載能力的計算
漸開線少齒差行星減速器與普通圓柱齒輪減速器、蝸輪減速機相比,具有體積小、重量輕、傳動比大、效率高、承載能力大、運行可靠和壽命長等優(yōu)點;與擺線針輪行星減速器相比,除具有上述優(yōu)點以外,在加工方面,可利用通用刀具在通用齒輪加工機床上加工.因而具有成本較低等優(yōu)點。而在承載能力方面是怎樣呢?本文就利用有限元法對二齒差行星減速器齒輪承載能力進行分析討論。
少齒差行星減速器是內(nèi)嚙合傳動。一般認為,它的一對嚙合齒面分別為凸齒面和凹齒面,兩者的曲率中心在齒面同一側(cè),齒面凹向相同,曲率半徑差很小,接觸變形致使接觸面積較大。因此,使得輪齒接觸應(yīng)力大大減小,接觸強度相應(yīng)提高。同時,還可以通過減小齒頂高來降低彎曲應(yīng)力,從而提高彎曲強度。此外,由于齒差數(shù)小,在理論嚙合點左右,具有多對接近嚙合的小間隙齒面,輪齒受力產(chǎn)生的微小變形使得這些小間隙消失,導(dǎo)致這些對齒面相互接觸,因而也進入嚙合狀態(tài):如果這種判斷符合實際情況,那么就會出現(xiàn)多對輪齒同時嚙合,顯然可以大大降低傳動沖擊,使得運轉(zhuǎn)更加平穩(wěn)、噪音更小。此外,當模數(shù)相同時,傳動能力與普通外嚙合圓柱齒輪減速器相比應(yīng)當有明顯提高:在工程實際中已有應(yīng)用實例證實了該判斷。
新聞:東坑鎮(zhèn)數(shù)控車床專用步進電機BG57BYGH112-4204性價比
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