Nidec Corporation

Eiji Furutachi

Kyohei Asahi

Hiroki Fujiwara

A motor includes a rotary assembly, a stationary assembly, and a bearing mechanism. The rotary assembly includes a resin portion that covers magnets and a rotor core. The rotor core includes a ring-shaped inner core portion, an outer core portion, and connecting portions that radially connect the core elements and the inner core portion. The resin portion includes an upper resin portion and a lower resin portion. The upper resin portion includes gate holes. The lower resin portion is located at a more radially inner side than the outer core elements, and includes a first core support mark exposing a portion of the bottom surface of the rotor core, and a second core support mark located in the outer core portion and exposing a portion of the bottom surface of the rotor core.

Motor

The motor comprises a rotary unit, a stationary unit disposed around the rotary unit, and a bearing mechanism. The rotary unit comprises a plurality of magnets, a rotor core, a resin portion which covers the plurality of magnets and the rotor core. The rotor core comprises a ring-shaped inner core portion disposed at a radially inner side of the plurality of magnets, an outer core portion, and a plurality of connecting portions which radially connects the plurality of core elements, which are disposed between the plurality of magnets, and the inner core portion. The resin portion comprises an upper resin portion and a lower resin portion. The upper resin portion includes a plurality of gate holes. The lower resin portion is disposed at a more radially inner side than the plurality of outer core elements, and further comprises a first core support mark which exposes a part of the bottom surface of the rotor core, and a second core support mark disposed in the outer core part, and exposes a part of the bottom surface of the rotor core.

The motor according to the present disclosure comprises a rotary unit, a stationary unit disposed around the rotary unit, and a bearing mechanism which rotatably supports the rotary unit relative to the stationary unit. The rotary unit comprises a plurality of magnets. The stationary unit comprises a stator disposed around the rotary unit, and a cover which is electrically conductive and covers a top surface of the stator, and the stator comprises a stator core which includes a plurality of teeth and a core back, and a coil which is wound around the stator core via an insulator. The cover has openings on at least one area of a circumferential interval between neighboring teeth when seen in a top view, and the cover is connected to a ground potential.

A motor includes a sensor magnet having a non-circular contour and a magnet cover fixed to an end portion of a shaft to cover the end portion of the shaft. The magnet cover includes a support portion positioned outside the end surface of the end portion of the shaft. In the support portion, a magnet hole having a non-circular cross section as the sensor magnet and extending in the direction of the rotation axis is provided. The sensor magnet is inserted into the magnet hole and fixed to the magnet hole.

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Kyoto, Japan

Eiji Furutachi