Minebea Mitsumi Inc.

Koichi Tamai

Toshiaki Seima

Haruomi Morohashi

Yukihiro Higuchi

Naoya Murakami

Takeshi Ohara

Kazuaki Saito

To improve the EMC performance of an electronic device on which a motor is mounted. A circuit board () comprises a substrate (), lands (P, P) that are formed on a main surface () of the substrate () and are for connecting a coil () of the motor (), a magnetic detection element () that outputs a detection signal corresponding to a position of a rotor () of the motor (), and a motor drive control IC () that generates drive signals (VOUTA, VOUTB) for driving the motor () based on the detection signal, wherein the magnetic detection element () and the motor drive control IC () are arranged in a region (AR) on a side of a minor angle (&#x3b8;) formed by a first straight line (a) and a second straight line (b) among regions that are on the main surface and are defined by the first straight line and the second straight line when viewing the substrate () from the main surface side, the first straight line connecting the land (P) and an axis of an output shaft of the motor (), the second straight line connecting the land (P) and the axis of the motor ().

Circuit board, motor unit, and fan

A circuit board for a motor unit equipped with a motor includes a substrate having a main surface being one of a pair of surfaces opposed to each other, and a back surface being another of the pair of surfaces, a magnetic detection element disposed in a predetermined region on an outer periphery side of the substrate on the main surface, and configured to output a detection signal in accordance with a position of a rotor of the motor, and a metal member formed between the outer periphery of the substrate and the magnetic detection element in the predetermined region on the main surface, and configured to receive a supplied ground voltage.

An impeller of this disclosure includes a hub having a ring shape; and a plurality of blades that are provided on an outer periphery of the hub, wherein the blade has a trailing edge formed such that an inner side of a radial width of the blade is curved in a direction opposite to a rotation direction, in a plan view as viewed in a direction of a rotation axis.

Growing community of inventors

Kakegawa, Japan

Koichi Tamai