汽车直流电动机的优缺点？ 无刷直流电动机的优缺点？
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直流电机的主要缺点：效率低，维护工作量大，电刷和换向器之间会产生换向火花，换向器容易烧蚀 转速低，转速越高，电刷和换向器产生的火花越大，这限制了直流电机转速的提高。质量和体积大。希望有所帮助！
优点：(1) 调速性能好。
(2) 起动力矩大。
(3) 控制比较简单。
缺点：有易损件。
直流电机调速性能优越，来易平滑调速，这个是交流电机无法取代的直流电动源机过载能力较强，热动和制动转矩较bai大。
但是直流电机换du向困难，还会产生火花，寿命短，要经常维护，价格也贵一zhi些所以很多地方都用交流电机取代了dao。
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