一、換向器有什么作用
換向(xiang)(xiang)器主要(yao)有鉤型、槽型、平面型等(deng)規格(ge)。由進(jin)口原材料精(jing)制(zhi)而成,產品功能(neng)在國際(ji)上提高了前輩的(de)水(shui)平,廣泛應(ying)(ying)用(yong)于電(dian)動(dong)工(gong)具(ju)、家電(dian)產品、汽車(che)、摩托(tuo)車(che)電(dian)機等(deng)領(ling)域;集電(dian)環(huan)、碳刷臺、接線板有各種規格(ge)型號的(de)產品。應(ying)(ying)用(yong)于汽車(che)發電(dian)機、汽油發電(dian)機等(deng)領(ling)域。那么(me)換向(xiang)(xiang)器的(de)作用(yong)是什(shen)么(me)呢?
換向(xiang)(xiang)器(qi)(qi)是起整流作用,其作用是使電(dian)(dian)樞繞組中的電(dian)(dian)流方向(xiang)(xiang)是交(jiao)(jiao)變(bian)的,以保(bao)證電(dian)(dian)磁(ci)轉矩方向(xiang)(xiang)始終不變(bian)。在(zai)發電(dian)(dian)機中,換向(xiang)(xiang)器(qi)(qi)能(neng)使元件(jian)中的交(jiao)(jiao)變(bian)電(dian)(dian)勢變(bian)為電(dian)(dian)刷間直流電(dian)(dian)勢;在(zai)電(dian)(dian)念頭中它能(neng)使外(wai)加(jia)直流電(dian)(dian)流變(bian)為元件(jian)中的交(jiao)(jiao)流電(dian)(dian)流,產生恒(heng)定(ding)方向(xiang)(xiang)的轉矩。
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二、換向器工作原理是什么
當(dang)(dang)線圈通(tong)過電(dian)(dian)流后(hou),會在永(yong)久磁鐵的(de)(de)作(zuo)用下,通(tong)過吸引和排斥(chi)力轉(zhuan)動(dong)(dong),當(dang)(dang)它轉(zhuan)到和磁鐵平衡時(shi),原來通(tong)著電(dian)(dian)的(de)(de)線較(jiao)對應換向器上(shang)的(de)(de)觸片(pian)就與電(dian)(dian)刷(shua)(shua)分離開,而電(dian)(dian)刷(shua)(shua)連接到符(fu)合產生(sheng)推動(dong)(dong)力的(de)(de)那組(zu)線圈對應的(de)(de)觸片(pian)上(shang),這(zhe)樣不停地(di)重復(fu)下去,直流電(dian)(dian)動(dong)(dong)機就轉(zhuan)起來了。
如果沒(mei)有換向(xiang)器的(de)作(zuo)(zuo)用(yong),那(nei)電機(ji)只能(neng)轉(zhuan)不到半圈就卡(ka)死(si)了(le)(le),只能(neng)當(dang)作(zuo)(zuo)電剎車了(le)(le)。
三、換向器表面最大功率為何值
Pnx小于50~200瓦每平(ping)方厘米。最大功(gong)率取決于換向(xiang)(xiang)器的(de)輸(shu)(shu)入電(dian)(dian)壓(ya)(ya)和輸(shu)(shu)出電(dian)(dian)流(liu)。一般來說,換向(xiang)(xiang)器的(de)最大功(gong)率是輸(shu)(shu)入電(dian)(dian)壓(ya)(ya)乘以輸(shu)(shu)出電(dian)(dian)流(liu)的(de)乘積。因此(ci),換向(xiang)(xiang)器的(de)最大功(gong)率可以通過測量輸(shu)(shu)入電(dian)(dian)壓(ya)(ya)和輸(shu)(shu)出電(dian)(dian)流(liu)來確(que)定。
要(yao)計(ji)算(suan)(suan)換(huan)向器(qi)(qi)的(de)最(zui)大功(gong)(gong)(gong)率(lv),首先(xian)需(xu)要(yao)測量(liang)換(huan)向器(qi)(qi)的(de)輸入電(dian)(dian)壓(ya)和輸出(chu)電(dian)(dian)流(liu)。可(ke)以使(shi)用專業的(de)電(dian)(dian)壓(ya)表(biao)(biao)和電(dian)(dian)流(liu)表(biao)(biao)來(lai)測量(liang)換(huan)向器(qi)(qi)的(de)輸入電(dian)(dian)壓(ya)和輸出(chu)電(dian)(dian)流(liu)。測量(liang)完成(cheng)后,可(ke)以使(shi)用計(ji)算(suan)(suan)器(qi)(qi)計(ji)算(suan)(suan)換(huan)向器(qi)(qi)的(de)最(zui)大功(gong)(gong)(gong)率(lv)。另外,換(huan)向器(qi)(qi)的(de)最(zui)大功(gong)(gong)(gong)率(lv)也可(ke)以通(tong)過查(cha)看換(huan)向器(qi)(qi)的(de)規(gui)格書來(lai)確定。最(zui)大功(gong)(gong)(gong)率(lv)是(shi)指電(dian)(dian)源在單位時間內,電(dian)(dian)路元件上能量(liang)的(de)最(zui)大變化量(liang),是(shi)具有大小及正(zheng)負的(de)物理量(liang)。在這里特指最(zui)大輸出(chu)功(gong)(gong)(gong)率(lv)。最(zui)大功(gong)(gong)(gong)率(lv)越大,電(dian)(dian)源所(suo)能負載的(de)設備也就越多。
四、換向器的材料有哪些
換向(xiang)器(qi)(qi)大多采用半(ban)塑(su)型(xing)換向(xiang)器(qi)(qi),由(you)塑(su)料殼體、銅質換向(xiang)片(pian)(pian)、云(yun)母片(pian)(pian)間(jian)絕緣(yuan)及金屬(shu)襯(chen)(chen)套(tao)組成,如(ru)下(xia)圖。由(you)于片(pian)(pian)間(jian)絕緣(yuan)仍為(wei)云(yun)母片(pian)(pian),不是全部為(wei)塑(su)料,故稱半(ban)塑(su)換向(xiang)器(qi)(qi)。小的換向(xiang)器(qi)(qi)可以沒有金屬(shu)襯(chen)(chen)套(tao)。
換向(xiang)片大多(duo)用(yong)電解銅(tong)制成,對耐磨性及表面(mian)軟(ruan)化溫度有(you)更高要求(qiu)的換向(xiang)器可采用(yong)銀銅(tong)或鎘(ge)銅(tong)。