换向器是几个接触片围成圆型，换向器是直流永磁串激电动机上为了能够让电动机继续转动下去原一个部件。结构上。分别连接转子上的每个抽头，外边连接两个电*称为电刷与之接触，同时只接触其中的两个。如果没有换向器的作用，那电机只能转不到半圈就卡死了只能当作电刹车了利用电机旋转时产生的离心力作为动力，控制起动电阻的大小，达到减少电机起动电流、增加起动转矩，使绕线式异步电念头实现无刷自控运行的装置。

气动换向器是(shi)直流电(dian)(dian)(dian)机的(de)(de)(de)重要部件(jian)，作(zuo)用(yong)---将电(dian)(dian)(dian)刷(shua)上(shang)(shang)所通过(guo)的(de)(de)(de)直流电(dian)(dian)(dian)流转换(huan)(huan)为绕组内的(de)(de)(de)交变电(dian)(dian)(dian)流或将绕组内的(de)(de)(de)交变电(dian)(dian)(dian)动(dong)(dong)势(shi)转换(huan)(huan)为电(dian)(dian)(dian)刷(shua)端上(shang)(shang)的(de)(de)(de)直流电(dian)(dian)(dian)动(dong)(dong)势(shi)。换(huan)(huan)向器(qi)(qi)俗称(cheng)整流子，直流永(yong)磁(ci)串激电(dian)(dian)(dian)动(dong)(dong)机上(shang)(shang)为了能够让(rang)电(dian)(dian)(dian)动(dong)(dong)机继续转动(dong)(dong)下去(qu)原一个(ge)部件(jian)。换(huan)(huan)向器(qi)(qi)包括：机械(xie)换(huan)(huan)向器(qi)(qi)、半塑换(huan)(huan)向器(qi)(qi)、全塑换(huan)(huan)向器(qi)(qi)。汽车用(yong)起动(dong)(dong)机上(shang)(shang)采用(yong)的(de)(de)(de)换(huan)(huan)向器(qi)(qi)主要用(yong)机械(xie)拱形换(huan)(huan)向器(qi)(qi)、塑料换(huan)(huan)向器(qi)(qi)。结构上(shang)(shang)，换(huan)(huan)向器(qi)(qi)是(shi)几个(ge)接(jie)触(chu)片围(wei)成圆型，分别连接(jie)转子上(shang)(shang)的(de)(de)(de)每(mei)个(ge)触(chu)头，外(wai)边(bian)连接(jie)的(de)(de)(de)两(liang)个(ge)电(dian)(dian)(dian)*称(cheng)为电(dian)(dian)(dian)刷(shua)与之(zhi)接(jie)触(chu)，同时只接(jie)触(chu)其中的(de)(de)(de)两(liang)个(ge)。