Nidec Corporation

Yosuke Kawano

Yusuke Iwai

Shigeo Hayashi

Hitoshi Takaki

Nobuaki Yasumoto

Hidehiko Hidaka

Satoshi Komatsu

Naoki Tabira

A DC brushless motor includes a housing including a plurality of attachment portions each of which is arranged to extend toward an apparatus, a base portion joined to the attachment portions, and a bearing holding portion joined to the base portion; a bearing member held by the bearing holding portion; a shaft supported by the bearing member to be rotatable about a central axis, and including a portion on one axial side to which blades that perform stirring in a heating chamber are joinable; a rotor holder fixed to the shaft; a rotor magnet held on an inside of a cylindrical portion of the rotor holder; a stator arranged radially inside the rotor magnet; and a circuit board electrically connected with the stator, and arranged axially opposite the opening of the rotor holder.

DC brushless motor including cover portion with fan blades

There is provided a motor including, a rotating portion and a stationary portion. The mounting plate includes a substantially cylindrical fixing cylindrical portion; an annular upper plate portion; an annular circumferential portion; and a mounting portion. A lower end of the fixing cylindrical portion is arranged at a level lower than that of a lower end of a bushing press-fit area. At least one of a lower end of a sleeve fixing area in which an outer circumferential surface of the sleeve and an inner circumferential surface of the bushing cylindrical portion are in contact with each other and a lower end of a radial gap which supports the shaft is arranged at a level higher than that of an upper end of the bushing press-fit area.

Motor, disk drive apparatus, and fan

A motor includes a rotating body including a magnet, and a fixed body including a stator. The stator includes a stator core having an annular core back portion with an upper and a lower surface, and a plurality of circumferentially spaced-apart tooth portions extending from the core back portion in a direction away from the rotational axis, and a plurality of coils provided by winding a conductive wire around the tooth portions of the stator core with multiple turns. The rotor holder is arranged axially above the stator to cover the stator. Further, an annular or arc-shaped attracting magnet arranged to attract the rotor holder toward the stator is arranged radially inwardly of the core back portion, the attracting magnet having an upper surface axially facing toward the rotor holder, and a lower surface arranged axially below the upper surface of the core back portion of the stator core.

Motor provided with chucking device and disk driving device equipped with the motor

A brushless motor driven by a sensorless driving circuit includes a rotating body capable of being rotated about a center axis; a rotor magnet arranged coaxially with the rotating body; a stator disposed opposite the rotor magnet; and at least one coil wound around the stator. The brushless motor is driven according to a signal containing a third harmonic component relative to a fundamental wave component in an induced electromotive force. Further, an amplitude ratio of the third harmonic component to the fundamental wave component in the induced electromotive force generated in the coil preferably is about 1% or higher.

Brushless motor

A brushless motor includes a substantially flat attachment plate and a circuit board. The attachment plate includes a plurality of motor attachment portions and a base portion arranged to interconnect the motor attachment portions. The circuit board is arranged on an upper surface of the base portion and includes a first area to which electronic parts are attached. The upper surfaces of the motor attachment portions are arranged higher than the upper surface of the base portion. The height of the upper surface of the circuit board in the first area is substantially equal to or greater than the height of the upper surfaces of the motor attachment portions.

Growing community of inventors

Kyoto, Japan

Yosuke Kawano