Nidec Corporation

Takahiro Suginohara

Takuya Yamane

Haruhiko Ito

Toshihide Sonoda

Kazuhiro Ono

Ryogo Mochizuki

Akira Sakauchi

Yusuke Ichioka

A motor includes a stationary unit including a stator and a rotation unit including a magnet unit disposed radially outward of the stator and a cylindrical rotor holder. The magnet unit is held on a radially inside surface of the rotor holder. The magnet unit includes first magnets each of which has N and S poles magnetized in a radial direction, and second magnets each of which has N and S poles magnetized in a circumferential direction. Magnetic poles of radially inner end portions of the first magnets adjacent to each other in the circumferential direction via the second magnet are different from each other. Magnetic poles of circumferential end portions of the second magnets adjacent to each other in the circumferential direction via the first magnet are different from each other. An interval is provided between a radially outside surface of each first magnet and the radially inside surface of the rotor holder, and between a radially outside surface of each second magnet and the radially inside surface of the rotor holder.

Motor with rotor holder having first and second magnets with different intervals to holder

A mirror rotating apparatus includes a stationary portion and a rotating portion. The stationary portion includes a detection sensor configured to detect rotation of the rotating portion. The rotating portion includes a mirror portion whose outside surface includes a plurality of mirror surfaces that face radially outward. The mirror portion includes a rotation detection surface opposite to the detection sensor, and a balance correction portion defined by a groove or a projection extending in a circumferential direction in the rotation detection surface. The balance correction portion locates a center of gravity of the mirror portion closer to the rotation axis. The rotation of the rotating portion causes the balance correction portion to pass through a region to which light is emitted from the detection sensor.

Mirror rotating apparatus

A motor for holding a disk with a mounting opening in place includes a rotor unit including a rotor magnet rotatable about a central axis and a stator unit including a stator arranged opposite to the rotor magnet and a circuit board electrically connected to the stator. Wiring lines of the circuit board include output-side land portions electrically connected to first ends of coils of the stator, a connection-side land portion electrically connected to second ends of the coils forming a neutral point, a connection portion electrically connected to an external power source, output-side wiring portions arranged to electrically interconnect the output-side land portions and the connection portion, and a connection-side wiring portion arranged to electrically interconnect the connection-side land portion and the connection portion. Each of the output-side wiring portions has a width greater than a width of the connection-side wiring portion.

Motor and disk drive apparatus provided with a circuit board with wirings

Growing community of inventors

Kyoto, Japan

Takahiro Suginohara