... profile design features:First, the curved face of the rotors engaged fully, thus contributing to the formation of a hydrodynamic lubrication film, reducing the ... ,using the design ideas of the greater rotor, bigger bearing, low-speed ", speed lower than other brands up to 30 ~ 50%, this ... 4 pole motor Direct drive, speed as low as 1480 r / min.Four, fully meet or exceed the national standard GB19153- ...