The non-brush,direct current electrical machine makes wholemachine work mutely,satisfying laboratory request,without replacing thecarbon brush as well ascarb on powder pollution.

• 2、由于转速采用PWM控制的调速方式，转速控制精度高，无刷直流变频电机使整机运行达到宁静工作，满足实验室要求，无需更换碳刷，无碳粉污染。