Mitsuba Corporation

Yoshichika Kawashima

Teppei Tokizaki

Kenji Sakata

Natsumi Tamura

Naoki Kojima

Tatsuyuki Saito

Toshiyuki Kimura

Ryuichi Takakusagi

Naoki Shioda

Motoaki Kobayashi

Masaki Hayata

Shigehiro Maita

Keiichi Bendo

Shunji Kumagai

Satoshi Tamura

Yuichi Nagase

Tomoyasu Sugiyama

Masakazu Saito

Yosuke Harigai

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

A deceleration mechanism is provided with first and second gears, a first tooth part arranged in the first gear and extending spirally in an axial direction of the first gear, an engagement projected part arranged on the first tooth part, second tooth parts arranged on the second gear, and an engagement recessed part arranged between the adjacent second tooth parts. The engagement projected part is formed in an arc shape in a direction orthogonal to the axial direction of the first gear and has a curvature center eccentric from a rotation center of the first gear. The second tooth parts are inclined with respect to the axial direction of the first gear and arranged in a circumferential direction of the second gear. The engagement projected part is formed in an arc-shape in a direction orthogonal to the axial direction of the first gear and engaged with the engagement projected part.

Deceleration mechanism and motor having deceleration mechanism installed therein

A speed reducer-attached motor includes a rotation shaft on which a worm gear is provided and which is supported rotatably around a central axis via a plurality of bearings, a motor part that is driven to be rotated around the rotation shaft as a central axis, a speed reducer part that includes at least one or more gears which include a worm wheel that is engaged with the worm gear, and a casing on which a shaft accommodation groove that accommodates the rotation shaft, a bearing accommodation recess part that accommodates the bearing, and an accommodation recess part that accommodates the speed reducer part are formed, wherein the shaft accommodation groove, the bearing accommodation recess part, and the accommodation recess part open at a top surface portion side of the casing.

Speed reducer-attached motor and speed reducer-attached motor assembly method

In an electric motor () which includes four permanent magnets () and in which the number of teeth () and the number of slots () are set to 6, when a polar arc angle of the permanent magnet () is &#x3b8;, and a skew angle of the teeth () and the slots () is &#x3b8;, the polar arc angle &#x3b8;and the skew angle &#x3b8;are set so as to satisfy 50&#xb0;&#x2264;&#x3b8;1&#x3c;70&#xb0; and 0&#xb0;&#x3c;&#x3b8;2&#x2264;20&#xb0;.

Electric motor

When teeth () are allocated in a circumferential direction in sequence of a U phase, a V phase and a W phase, a forward wound coil wound on each of the phases is provided as a coil of the U phase, the V phase and the W phase, and a reverse wound coil wound on each of the phases is provided as the coil of a &#x2212;U phase, a &#x2212;V phase and a &#x2212;W phase, the coils are electrically connected between the neighboring segments in an order of the U phase, the &#x2212;W phase, the &#x2212;W phase, the V phase, the &#x2212;U phase, the &#x2212;U phase, the W phase, the &#x2212;V phase and the &#x2212;V phase, and the wire () drawn between the armature core () and the commutator () is drawn around the rotation shaft in the same direction.

An electric motor includes a yoke having a cylindrical section, two pairs of permanent magnets disposed at an inner circumferential surface of the cylindrical section to oppose each other, and an armature rotatably supported further inside in a radial direction than the permanent magnets, wherein at least a pair of first flat sections opposing each other in the radial direction are formed at the cylindrical section, and the permanent magnets are disposed at positions distant from the first flat sections.

An electric motor includes a yoke having six magnetic poles; a rotary shaft which is provided inside the yoke in a freely rotatable manner; an armature core () which has teeth () attached to the rotary shaft, radially extending in a radial direction and set in an arrangement of an even number, and an even number of slots () formed between the teeth; an armature coil () which is wound around the teeth in a single wave winding; and a commutator () which is provided in the rotary shaft to be adjacent to the armature core () and has a plurality of circumferentially disposed segments () to which the armature coil () is connected.

In an electric motor, a brush holder stay () has an opening section through which a commutator () is able to be inserted in a rotary shaft direction (O), brush holders () extend in the rotary shaft direction (O) and are formed in a flat spring shape biased toward the inside in a radial direction, base end sections of the brush holders () are supported by the brush holder stay () at intervals in a circumferential direction around the rotary shaft (), and brushes () are held by the front end sections of the brush holders ().

An electric motor equipped with deceleration device () is provided with a main shaft component () that is formed substantially in a circular rod shape, and has one end portion () that is rotatably supported at a substantial center of a bottom portion () of a motor housing () and another end portion () that protrudes towards an outer side through an aperture in the motor housing (), the main shaft component () is fixed to the motor housing () via the one end portion (). An armature () is disposed inside the motor housing () so as to be on the same axis as the main shaft component () and so as to surround the main shaft component (), and a deceleration device () is disposed between the armature () and the other end portion () of the main shaft component () so as to surround the main shaft component (), and an output component (), which is formed in a toroidal shape, is disposed on the same axis as the main shaft component () so as to surround the main shaft component ().

Electric motor equipped with deceleration device

An electric motor includes a yoke having a plurality of magnetic poles, a rotary shaft, an armature core () attached to the rotary shaft, the armature core () having a plurality of teeth () and slots (), an armature coil () wound on the teeth () through an intensive winding method, a commutator having a plurality of segments () installed at the rotary shaft and disposed in a circumferential direction, a low speed brush () and a high speed brush () configured to supply power to the armature coil () via the segments (), and a common brush () commonly used in these brushes, wherein, when n is a natural number of 3 or more, a ratio of the numbers of magnetic poles, slots (), and segments () is set to 2:3:3n.

In an electric motor, magnets () have two pairs of poles, the number of teeth () is 18, and the number of segments () of a commutator is 18. Winding wires () for forming an armature coil () are formed by a first conductive wire () or a second conductive wire (). The winding wire () has a first coil winding wire (A) and a second coil winding wire (B). The coil winding wires are each wound around four teeth () adjacent to each other. An end () of the second coil winding wire is connected to a segment () adjacent to a segment arranged at a position which is point symmetric with respect to a segment to which an end () of the first coil winding wire is connected. According to the invention, in the electric motor capable of changing the rotational speed of the armature by switching application of an electric current among three brushes, vibration and operating noise can be reduced, and mounting of the connecting wires and the winding wires can be facilitated.

A windshield wiper motor includes a reduction mechanism unit and an electric motor. The electric motor includes a yoke formed in a bottomed cylindrical shape; four magnets arranged in a cylindrical shape on an inner surface of the yoke, an armature including a rotary shaft rotatably supported by the yoke, an armature core fixed to the rotary shaft and including any teeth of fourteen teeth, eighteen teeth, and twenty two teeth, a commutator being fixed to the rotary shaft and including a plurality of segments insulated from each other with the same number as the number of the teeth of the armature core, an armature coil being wound, and a plurality of connecting wires respectively connected to the segments arranged to face each other around the rotary shaft, and a first brush, a second brush, and a third brush coming into sliding contact with the segments of the commutator.

Growing community of inventors

Kiryu, Japan

Yoshichika Kawashima