A FLUID DYNAMIC BEARING MOTOR

摘要

A fluid dynamic bearing motor is provided to prevent an inner portion of the motor from being contaminated during an oil injection process by forming an oil injection hole at a hub. A fluid dynamic bearing motor includes a stator and a rotor. The stator includes a housing(30), a first sleeve(40), and a coil(70). A cylindrical wall is formed at a center of the housing. The hollow first sleeve is fixed on an inner periphery of the cylindrical wall. The coil is fixed on the cylindrical wall. The rotor includes a shaft(20), a hub(10), and a magnet(60). The shaft is rotatably coupled with a hollow portion of the first sleeve. The hub is connected to and rotated with the shaft and includes a ring-shaped wall. The ring-shaped wall is downwardly elongated to enclose the first sleeve and forms a first taper seal with a slant surface. The magnet is arranged on the hub to face the coil. An oil injection hole is formed on the hub.