Bently 3500/45 139554-01

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描述

Bently 3500/45 139554-01

從零開始學(xué)電路基礎(chǔ)- -“電路”
電路的概念- -電路是指由實際元器件構(gòu)成的電流的通路。
電路的構(gòu)成- -電路由電源、負(fù)載和中間環(huán)節(jié)組成。電源是可將其他形式的能量轉(zhuǎn)換成電能、向電路提供電能的裝置;負(fù)載是可將電能轉(zhuǎn)換成其它形式的能量、在電路中接受電能的設(shè)備;中間環(huán)節(jié)是電源和負(fù)載之間不可缺少的連接、控制和保護部件統(tǒng)稱為中間環(huán)節(jié)，如導(dǎo)線、開關(guān)及各種繼電器等。
電路的功能- -電力系統(tǒng)中的電路可對電能進行傳輸、分配和轉(zhuǎn)換;電子技術(shù)中的電路可對電信號進行傳遞、變換、儲存和處理。
電路模型- -在電路分析中，為了方便于對實際電氣裝置的分析研究，通常在一定條件下需要對實際電路采用模型化處理，即用抽象的理想電路元件及其組合近似的代替實際的器件，從而構(gòu)成了與實際電路相對應(yīng)的電路模型。
理想電路元件- -理想電路元件是實際電路器件的理想化和近似，其電特性唯一、精確，可定量分析和計算。理想電路元件可分為有源和無源兩大類，無源二端元件包括電阻元件(只具耗能的電特性)、電感元件(只具有存儲磁能的電特性)。電容元件(只具有存儲電能的電特性);有源二端元件包括理想電壓源(輸出電壓恒定，輸出電流由它和負(fù)載共同決定)、理想電流源(輸出電流恒定，兩端電壓由它和負(fù)載共同決定)。
為了便于分析電路，應(yīng)預(yù)先在電路圖上標(biāo)示出電壓、電流的方向，電路圖上的電壓、電流方向稱為參考方向，原則上可以任意假定。元件究竟是電源還是負(fù)載，應(yīng)由元件上電壓、電流的實際方向決定：實際方向關(guān)聯(lián)時，元件是負(fù)載;實際方向非關(guān)聯(lián)時，元件是電源。

產(chǎn)品承諾：
保?證?全新原裝進口,
保?證?安全準(zhǔn)時發(fā)貨，
保?證售后服務(wù)質(zhì)量，
優(yōu)勢價格，大量現(xiàn)貨。

主營DCS系統(tǒng)配件
機器人系統(tǒng)配件
大型伺服系統(tǒng)配件
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Enlarge
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15天包退換 一年質(zhì)保 大量現(xiàn)貨? 國內(nèi)實力庫存商家


選擇深圳長欣，選擇放心，售后無憂大量現(xiàn)貨，當(dāng)天順豐發(fā)貨！
主營：本特利，英維思，伍德沃德，?？怂共_、西屋、瑞恩、施耐德莫迪康、ABB、AB、西門子、摩托羅拉、GE發(fā)那科、安川、博世力士樂，ACSO，力士樂等各大品牌的DCS系統(tǒng)配件，機器人系統(tǒng)配件，大型伺服系統(tǒng)備件。

先介紹幾點經(jīng)驗。
1、先通讀一遍“系統(tǒng)手冊”（不管能不能看懂，先了解個大概，以便學(xué)習(xí)編程時查找）；
2、由位控邏輯入手，逐漸增加定時、計數(shù)等條件，把或、與、非關(guān)系理順；
3、進而練習(xí)整數(shù)運算、實數(shù)運算、類型轉(zhuǎn)換；
4、量程轉(zhuǎn)換、PID調(diào)節(jié)回路的建立及P、I、D參數(shù)的理解（最好是有個物理回路驗證，比如變頻器+電機+測速傳感器）；
5、循環(huán)、順序、跳轉(zhuǎn)等程序控制（盡量避免跳轉(zhuǎn)，非跳不可時也是跳的越近越好）；
6、中斷、通訊、位置控制....

本人以ABB工業(yè)機器人配件DSQC系列和Motorola MVME系列，GE 卡件 模塊 驅(qū)動器系列為主攻。各位電工朋友可根據(jù)自己的條件選擇適合自己的PLC品牌，由于PLC的基本框架大同小異，學(xué)會一種至于其它的學(xué)習(xí)起來也就簡單了。

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