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Z(Z355-Z900)

Z(Z355-Z900)直流电机

来源:子昂电机维修 日期:2018-09-28 11:29:41

Z(Z355-Z900)直流电机

直(zhi)(zhi)(zhi)流(liu)电(dian)(dian)(dian)机(ji)(ji)(ji)(ji)(direct current machine)是指能(neng)(neng)(neng)将(jiang)直(zhi)(zhi)(zhi)流(liu)电(dian)(dian)(dian)能(neng)(neng)(neng)转(zhuan)换(huan)成机(ji)(ji)(ji)(ji)械能(neng)(neng)(neng)(直(zhi)(zhi)(zhi)流(liu)电(dian)(dian)(dian)动机(ji)(ji)(ji)(ji))或将(jiang)机(ji)(ji)(ji)(ji)械能(neng)(neng)(neng)转(zhuan)换(huan)成直(zhi)(zhi)(zhi)流(liu)电(dian)(dian)(dian)能(neng)(neng)(neng)(直(zhi)(zhi)(zhi)流(liu)发电(dian)(dian)(dian)机(ji)(ji)(ji)(ji))的(de)旋转(zhuan)电(dian)(dian)(dian)机(ji)(ji)(ji)(ji)。它是能(neng)(neng)(neng)实现直(zhi)(zhi)(zhi)流(liu)电(dian)(dian)(dian)能(neng)(neng)(neng)和机(ji)(ji)(ji)(ji)械能(neng)(neng)(neng)互相转(zhuan)换(huan)的(de)电(dian)(dian)(dian)机(ji)(ji)(ji)(ji)。当它作电(dian)(dian)(dian)动机(ji)(ji)(ji)(ji)运(yun)行时是直(zhi)(zhi)(zhi)流(liu)电(dian)(dian)(dian)动机(ji)(ji)(ji)(ji),将(jiang)电(dian)(dian)(dian)能(neng)(neng)(neng)转(zhuan)换(huan)为机(ji)(ji)(ji)(ji)械能(neng)(neng)(neng);作发电(dian)(dian)(dian)机(ji)(ji)(ji)(ji)运(yun)行时是直(zhi)(zhi)(zhi)流(liu)发电(dian)(dian)(dian)机(ji)(ji)(ji)(ji),将(jiang)机(ji)(ji)(ji)(ji)械能(neng)(neng)(neng)直(zhi)(zhi)(zhi)流(liu)发电(dian)(dian)(dian)机(ji)(ji)(ji)(ji)

直流(liu)发电(dian)(dian)(dian)机的(de)工作原(yuan)理(li)就是把电(dian)(dian)(dian)枢线圈中感应(ying)的(de)交(jiao)变电(dian)(dian)(dian)动势,靠(kao)换向器配合电(dian)(dian)(dian)刷的(de)换向作用,使(shi)之从电(dian)(dian)(dian)刷端引(yin)出时变为直流(liu)电(dian)(dian)(dian)动势的(de)原(yuan)理(li)。

感应电动势的方(fang)向(xiang)(xiang)按右手定则确定(磁感线指向(xiang)(xiang)手心,大(da)拇指指向(xiang)(xiang)导体运动方(fang)向(xiang)(xiang),其他四(si)指的指向(xiang)(xiang)就是(shi)导体中感应电动势的方(fang)向(xiang)(xiang)。)

线圈(quan)逆时(shi)针方向(xiang)旋转180°时(shi),这时(shi)导(dao)体c d 位于N 极(ji)下,导(dao)体a b 位于S 极(ji)下,各(ge)导(dao)体中(zhong)电动(dong)势都(dou)分别改变(bian)了方向(xiang)。

直流发电机原理模型

从图看出(chu)(chu),和(he)电刷(shua) A接触的(de)(de)导体永(yong)远位于 N极下(xia),同样(yang),和(he)电刷(shua) B接触的(de)(de)导体永(yong)远位于S 极下(xia)。因此,电刷(shua) A始(shi)终有(you)正极性(xing),电刷(shua) B始(shi)终有(you)负极性(xing),所以电刷(shua)端能引出(chu)(chu)方向不变的(de)(de)但大小(xiao)变化的(de)(de)脉振电动势。如果电枢上(shang)线圈数增多,并按照一定(ding)的(de)(de)规律(lv)把它们连(lian)接起来,可使脉振程度减小(xiao),就可获得(de)直流电动势。这就是直流发电机的(de)(de)工作(zuo)原理。

控制原理

直(zhi)流无(wu)刷电机(ji)的(de)(de)控(kong)(kong)制原理,要(yao)(yao)让电机(ji)转(zhuan)动(dong)起来(lai),首先控(kong)(kong)制部就(jiu)(jiu)必须根据hall-sensor感应到的(de)(de)电机(ji)转(zhuan)子(zi)目(mu)前所(suo)在位置(zhi),然后依照定子(zi)绕线决(jue)定开启(或关闭)换流器(inverter)中功(gong)(gong)率(lv)晶(jing)(jing)(jing)体(ti)管(guan)的(de)(de)顺序(xu),inverter中之AH、BH、CH(这(zhei)些(xie)称为上臂(bei)功(gong)(gong)率(lv)晶(jing)(jing)(jing)体(ti)管(guan))及AL、BL、CL(这(zhei)些(xie)称为下臂(bei)功(gong)(gong)率(lv)晶(jing)(jing)(jing)体(ti)管(guan)),使电流依序(xu)流经(jing)电机(ji)线圈产生顺向(xiang)(或逆向(xiang))旋转(zhuan)磁场,并(bing)与(yu)转(zhuan)子(zi)的(de)(de)磁铁相互作用,如此(ci)就(jiu)(jiu)能使电机(ji)顺时/逆时转(zhuan)动(dong)。当电机(ji)转(zhuan)子(zi)转(zhuan)动(dong)到hall-sensor感应出另一组(zu)信号的(de)(de)位置(zhi)时,控(kong)(kong)制部又再开启下一组(zu)功(gong)(gong)率(lv)晶(jing)(jing)(jing)体(ti)管(guan),如此(ci)循环电机(ji)就(jiu)(jiu)可以依同一方向(xiang)继续转(zhuan)动(dong)直(zhi)到控(kong)(kong)制部决(jue)定要(yao)(yao)电机(ji)转(zhuan)子(zi)停止则关闭功(gong)(gong)率(lv)晶(jing)(jing)(jing)体(ti)管(guan)(或只(zhi)开下臂(bei)功(gong)(gong)率(lv)晶(jing)(jing)(jing)体(ti)管(guan));要(yao)(yao)电机(ji)转(zhuan)子(zi)反(fan)(fan)向(xiang)则功(gong)(gong)率(lv)晶(jing)(jing)(jing)体(ti)管(guan)开启顺序(xu)相反(fan)(fan)。

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