It has the characteristic of high reliability, simple structure, easy maintenance, good features (quick response, excellent performance at low speed), fast heat radiation, rotate speed not restricted by mechanical commutation, long life and low noise. It is suitable for cotton, wool, fibrilia, silk, chemical fiber etc, various of textile and dyeing machine. It can work in atmosphere of multi-dust, short staple, high temperature and humidity. Also it can be used for driving the other mechanism.