Minebea Mitsumi Inc.

Naoto Toyomura

Takuji Yamada

Provided is a rotor capable of effectively utilizing magnetic flux generated from a magnet, a motor using the rotor, and an electronic device. The rotor, the motor using the rotor, and the electronic device include a rotor core including: an annular part; a plurality of magnetic pole pieces extending in a radial direction; and a plurality of connecting parts configured to connect the annular part and each of the plurality of magnetic pole pieces; a plurality of first magnets disposed between two adjacent magnetic pole pieces of the plurality of magnetic pole pieces in a circumferential direction; and a plurality of second magnets disposed in a space formed between two adjacent connecting parts of the plurality of connecting parts in the circumferential direction, the connecting parts extending in a direction having both of a component of the radial direction and a component of the circumferential direction.

Rotor, motor using the rotor, and electronic device

A motor includes a stator and a substrate. The stator includes a plurality of magnetic bodies and a coil wound around each of the magnetic bodies. The substrate opposes the stator in the rotational axis direction. The coil includes a first layer and a second layer stacked on the first layer. 1≤D/L holds, where L is a thickness of the magnetic body in the rotational axis direction and D is a width of the magnetic body in a radial direction. In the radial direction, a conducting wire of the first layer and a conducting wire of the second layer making up an inner edge of the coil are in contact with each other, and, in the radial direction, a conducting wire of the first layer and a conducting wire of the second layer making up an outer edge of the coil are in contact with each other.

Motor

The present invention provides a rotor, a motor using the rotor and an electronic device capable of effectively utilizing magnetic flux generated from a magnet. The rotor includes a rotor core including an annular portion and a plurality of magnetic pole pieces radially extending from the annular portion via a pair of joint portions, a plurality of first magnets disposed between the neighboring magnetic pole pieces in a circumferential direction, and a plurality of second magnets disposed between the pair of joint portions, in which each of the first magnets contacts side surfaces of two neighboring magnetic pole pieces in the circumferential direction and each of the second magnets contacts inner surfaces of the magnetic pole pieces in a radial direction.

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Nagano, Japan

Naoto Toyomura