电动工具换向器在使用的时候为了能够提高直流电机的使用寿命，运转稳定性以及降低直流电机的噪声和电磁干扰，无刷直流电机有逐步取代有刷电机的趋势，一般交流电机不用恒磁场，所以用不着换向器，也就无须电刷。这样的换向器有很多种不同的类型，根据不同的使用效果可以将其包括电动机换向器以及气动换向器等等，依照不同的使用性质可以将其分为交流换向器以及微型电机换向器等等类型，不同的分类有不同的特点。

电动工具换向器能够发(fa)(fa)生电(dian)(dian)(dian)(dian)(dian)流，电(dian)(dian)(dian)(dian)(dian)流是主电(dian)(dian)(dian)(dian)(dian)流换向器(qi)时(shi)而产生的反(fan)向电(dian)(dian)(dian)(dian)(dian)流和(he)(he)电(dian)(dian)(dian)(dian)(dian)抗(kang)电(dian)(dian)(dian)(dian)(dian)压(ya)，致使(shi)电(dian)(dian)(dian)(dian)(dian)刷(shua)(shua)在电(dian)(dian)(dian)(dian)(dian)机换向器(qi)外表(biao)滑动时(shi)会引起边部火(huo)花以及(ji)电(dian)(dian)(dian)(dian)(dian)弧。随着(zhe)经济(ji)技(ji)术水平在不时(shi)得到发(fa)(fa)展，该种类型的换向器(qi)是由很多局部组合而成，其中有换向环和(he)(he)电(dian)(dian)(dian)(dian)(dian)刷(shua)(shua)组合而成，碳刷(shua)(shua)就是电(dian)(dian)(dian)(dian)(dian)刷(shua)(shua)的一种。电(dian)(dian)(dian)(dian)(dian)动工具换向器(qi)的电(dian)(dian)(dian)(dian)(dian)刷(shua)(shua)始(shi)终和(he)(he)换向环进行摩擦，换向的瞬(shun)间还会发(fa)(fa)生电(dian)(dian)(dian)(dian)(dian)火(huo)花，因此(ci)，电(dian)(dian)(dian)(dian)(dian)刷(shua)(shua)是直流电(dian)(dian)(dian)(dian)(dian)机力(li)的易损件，所以也非常的重(zhong)要。