Mitsuba Corporation

Satoshi Tamura

Teppei Tokizaki

Natsumi Tamura

Yoshichika Kawashima

Hiroto Tanaka

Motoaki Kobayashi

Masaki Hayata

Tomoo Iijima

Masakazu Saito

A brushless motor includes a motor part and a gear part. The motor part includes: a rotating shaft, having a first gear; a rotor, having a bottom wall and a side wall, the bottom wall being fixed to the rotating shaft; magnets, fixed to the side wall and arranged side by side in a circumferential direction of the rotor; a stator, provided between the rotating shaft and the magnets in a radial direction of the rotor and wound with a coil; and a motor housing, rotatably supporting the rotating shaft, and accommodating the rotor and the stator. The gear part includes: a second gear, meshed with the first gear; an output shaft, having an output part, having a base end side thereof fixed to the second gear, and parallel to the rotating shaft; and a gear housing, rotatably supporting the output shaft, and accommodating the second gear.

Brushless motor

In a 4-pole, 6-slot, 18-segment electric motor, one forward winding coil () and two reverse winding coils () are wound on each tooth (). When the forward winding coils are formed of coils corresponding to a U phase, a V phase, and a W phase and the reverse winding coils are formed of coils corresponding to a '&#x2212;U' phase, a '&#x2212;V' phase, and a '&#x2212;W' phase, the coils, which correspond to a U phase, a &#x201c;&#x2212;W&#x201d; phase, a &#x201c;&#x2212;W&#x201d; phase, a V phase, a &#x201c;&#x2212;U&#x201d; phase, a &#x201c;&#x2212;U&#x201d; phase, a W phase, a &#x201c;&#x2212;V&#x201d; phase, and a &#x201c;&#x2212;V&#x201d; phase, are electrically connected in this order between the adjacent segments. When the number of turns of the coils () corresponding to a U phase, a V phase, and a W phase is denoted by T1, the number of turns of the coils (), which correspond to a &#x201c;&#x2212;U&#x201d; phase, a &#x201c;&#x2212;V&#x201d; phase, and a &#x201c;&#x2212;W&#x201d; phase and first come into sliding contact with a brush, is denoted by T2, and the number of turns of the coils (), which correspond to a &#x201c;&#x2212;U&#x201d; phase, a &#x201c;&#x2212;V&#x201d; phase, and a &#x201c;&#x2212;W&#x201d; phase and later come into sliding contact with the brush, is denoted by T3, &#x201c;T2&#x3e;T1&#x3e;T3&#x201d; is satisfied.

Electric motor with commutator segments, anode and cathode brushes and coils having varying number of turns based on anode brush position angle

An electric motor includes: brushes () that are brought into sliding contact with a commutator of an armature that is fixed to a rotation shaft and feeds electric power; a brush holder stay () that supports the brushes () via brush holders (); noise prevention elements () that are electrically connected to the brushes (); and terminals () and jump wires () that electrically connect between the brush holders () and the noise prevention elements (), wherein first connection portions, which connect between the noise prevention elements () and the terminals (), and second connection portions, which connect between the terminals () and the jump wires (), are both disposed only on a first surface (S) of the brush holder stay ().

Electric motor

Growing community of inventors

Kiryu, Japan

Satoshi Tamura