Nidec Corporation

Hongbing Du

Toshikazu Himeno

Kazuya Enokizono

Junichi Hashimoto

Shigeharu Sumi

Harushige Osawa

A brushless motor includes a stationary unit and a rotary unit rotatably supported with respect to the stationary unit. The stationary unit includes an armature and a base member arranged to support the armature. The rotary unit includes a magnet, a hub made of a magnetic material and a rotor yoke made of a magnetic material. The armature includes a plurality of coil patterns arranged along a circumferential direction. The hub includes an inner lower surface, an outer lower surface and a recess portion. The recess portion is arranged between the inner lower surface and the outer lower surface and depressed upward. At least a portion of the magnet is accommodated within the recess portion. At least one of the inner lower surface and the outer lower surface is positioned above a lower surface of the magnet.

Brushless motor and disk drive apparatus

A brushless motor includes a plate-shaped armature and a magnet facing either one of a top surface and a bottom surface of the armature. An inner peripheral surface of a base member and an outer peripheral surface of a bearing mechanism contact with each other or face each other in a diametrical direction with an adhesive therebetween in a first fixing part. Further, a rotor yoke and a hub protrusion contact with each other or face each other in a diametrical direction with an adhesive therebetween in a second fixing part. Then, a press-fitting or adhesion is carried out in the other of the first and the second fixing part.

Brushless motor, disk drive apparatus and brushless motor manufacturing method

A spindle motor includes a flat stator, a rotor magnet arranged above the stator, and a magnetic portion made of a ferromagnetic material. The magnetic portion is positioned lower than the stator and the magnetic portion are axially overlapped with coils. A magnetic attraction force is generated between the magnetic portion and the rotor magnet. Since the magnetic portion is positioned lower than the stator, it is possible to cause magnetic fluxes to efficiently flow between the rotor magnet and the stator. Further, the stator includes a protrusion protruded radially outward beyond an outer circumferential portion of a rotor hub. Accordingly, in a plan view, the stator is positioned radially outward of the rotor hub.

Spindle motor and disk drive apparatus

A stationary unit of a brushless motor includes a flat armature and a base member arranged to support the armature. The armature includes a power supply portion to which a lead wire is connected. The base member includes a wall portion and a window portion. The wall portion is radially opposed to an outer edge portion of the armature. The window portion is positioned below the power supply portion to axially extend through the base member. An adhesive agent exists between the wall portion and the outer edge portion of the armature. Accordingly, the base member and the armature are strongly fixed to each other. Further, a sealing material is interposed between a whole periphery of an edge of the window portion and the armature, so that the window portion is sealed.

Brushless motor, disk drive apparatus, and method of manufacturing the brushless motor

A head assembly supports an arm for angular displacement about an axis in a disk drive. The bearing assembly includes a fixed shaft , a plurality of bearings and , a sleeve and dampers . The bearings and are disposed about the shaft . The sleeve is coupled to the bearings and for angular displacement about the shaft , and one or more darpers are coupled to the sleeve. Each damper includes a plurality of holding portions and one or more damping masses the holding portions are arranged circumferentially about the axis of the shaft as an axis of rotation of the arm, and distance between each adjacent two damping portions is approximately equal to each other, each holding portion has an inner space. The damping masses are movably accommodated in the inner space of the respective holding portions. The energy of the vibration of the head and the arm is absorbed in a short time by movements of the damping masses and by friction between the damping masses and inner surface of the holding portion, and/or by collisions of the damping masses.

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Hongbing Du