Nidec Corporation

Nobuyuki Iwashita

Keizo Furukawa

Masato Yamamoto

Jun Nagasawa

Koichi Okumura

A motor includes a shaft, an annular rotor magnet, an armature arranged to cover the rotor magnet, an upper bracket fixed to an axial upper portion of the armature, and a lower bracket fixed to an axial lower portion of the armature. The armature includes an annular core-back, a plurality of magnetic pole teeth protruding radially inward from the core-back, an insulator arranged to cover the magnetic pole teeth, and a coil wound around the magnetic pole teeth through the insulator. The insulator includes an annular core-back insulating portion arranged radially outward of the coil and extended axially upward. The upper bracket is fixed by a plurality of fixing members positioned radially inward of an outer circumferential surface of the core-back.

Motor including brackets and fixing members

A motor includes a shaft, a bearing arranged to support the shaft such that the shaft is rotatable about a central axis, a rotating body fixed to the shaft and including a rotor magnet arranged in an outer circumference thereof, a stator arranged radially outward of the rotor magnet, a circuit board arranged to be perpendicular to the central axis on one axial side of the rotating body, and an encoder arranged to detect rotation of the rotating body. The encoder includes a reflection pattern arranged on a surface of the rotating body which is opposed to the circuit board, and a reflective rotation detection sensor arranged on the circuit board to detect the rotation of the rotating body by irradiating the reflection pattern with light.

Motor having an encoder to detect rotation of a rotating body

A motor includes a stator, a bearing, a cover, a shaft, a rotor holder and a rotor magnet. The cover member includes an outer cylinder portion arranged to support the stator on the inner surface thereof, an inner cylinder portion arranged to support the bearing on the inner surface thereof and a bottom portion arranged to interconnect the lower end of the outer cylinder portion and the lower end of the inner cylinder portion. The stator includes a stator core, an insulator arranged to cover the stator core and coils. The cover member is preferably formed by press-forming a single metal plate member. The insulator includes a protrusion portion positioned radially outwards of the coils to protrude upwards higher than the upper end of the outer cylinder portion. The upper ends of the coils are positioned higher than the upper end of the outer cylinder portion.

Growing community of inventors

Kyoto, Japan

Nobuyuki Iwashita