Nidec Corporation

Norikazu Oguchi

Osamu Wada

Kazuto Miyajima

Yoshihiro Takemura

Tadahiro Tanaka

Shohei Fukunaga

The invention is a spindle motor including a rotor hub bearing a rotational load, lubricant-containing bearing systems rotatably supported by the rotor hub, and stator windings wound on a stationary member, so as to oppose the rotor magnet. At least a portion of the rotor hub is in a clean environment, with the motor substantially sealed by a sealing unit. The spindle motor has a leakage prevention unit which prevents the lubricant trying to leak out the bearing systems and out the motor, when centrifugal forces produced by a rotor hub rotating at a high speed are exerted on the lubricant.

Spindle motor with bearing system having fluid sealing and leakage

A spindle motor comprises a stationary shaft, a rotor hub having an annular rotor magnet and rotatably mounted by bearings to the stationary shaft, a stator fixedly mounted to the stationary shaft so as to face the rotor magnet, a flexible printed circuit board connected to leads from the stator, and a reinforcement member composed of an annular plate portion and a tubular portion extending axially from the inner edge of the plate portion and disposed between the stationary shaft and the stator. For assembly, the stator is fitted onto the outer side of the tubular portion and then, the flexible printed circuit board is mounted to the plate portion of the reinforcement member. The tubular portion of the reinforcement member is joined to the outer side of the stationary shaft. Accordingly, the flexible printed circuit board is strengthened effectively and the assembly of the components will be eased.

Spindle motor

A spindle motor has a stationary shaft, a rotor hub rotatably supported by the stationary shaft via a bearing, a loop-like rotor magnet attached to the internal surface of the rotor hub, and a stator disposed to opposedly face the rotor magnet. The stationary shaft has an opening at its base end. A connector is fit into the opening, and a wire lead drawn from a coil of the stator is electrically connected to the connector. The connector is detachably coupled to a mating connector of an external unit. Through these connectors, the power is supplied to the coil from the external unit.

Growing community of inventors

Komagane, Japan

Norikazu Oguchi