公开(公告)号：US11777359B2

公开(公告)日：2023-10-03

申请号：US17342232

申请日：2021-06-08

Applicant: MAKITA CORPORATION

Inventor： Fuminari Fujii

IPC: H02K5/04 ,  H02K3/52 ,  H02K7/14 ,  H02K9/06 ,  H02K21/16 ,  B25F5/00

CPC classification number: H02K3/522 ,  H02K5/04 ,  H02K7/145 ,  H02K9/06 ,  H02K21/16 ,  B25F5/008 ,  H02K2203/09 ,  H02K2203/12

Abstract: An electric work machine includes a smaller motor. An electric work machine includes a motor and a housing accommodating the motor. The motor includes a stator and a rotor rotatable about a rotation axis. The stator includes a stator core, an insulator fixed to the stator core, a plurality of coils fixed to the insulator, and a terminal connected to each of the plurality of coils. The housing includes at least one first tab in contact with at least a part of a surface of the stator. The at least one first tab is at the same position as at least a part of the terminal in an axial direction parallel to the rotation axis.

公开(公告)号：US11750068B2

公开(公告)日：2023-09-05

申请号：US17323565

申请日：2021-05-18

Applicant: MAKITA CORPORATION

Inventor： Fuminari Fujii

IPC: H02K11/21 ,  H02K1/18 ,  H02K3/28 ,  H02K3/32 ,  H02K7/14 ,  H02K1/2795

CPC classification number: H02K11/21 ,  H02K1/182 ,  H02K1/2795 ,  H02K3/28 ,  H02K3/32 ,  H02K7/145

Abstract: An electric work machine includes a smaller motor. An electric work machine includes a motor including a stator and a rotor rotatable about a rotation axis, and a sensor board including a rotation sensor that detects rotation of the rotor and a plate supporting the rotation sensor. The plate includes a first surface facing an end face of the rotor in an axial direction parallel to the rotation axis and a support area receiving the rotation sensor that faces the end face, and a second surface facing at least a part of the stator. In the axial direction, a distance between the support area and the end face is shorter than a distance between at least a part of the second surface and the end face.

公开(公告)号：US12206313B2

公开(公告)日：2025-01-21

申请号：US17729337

申请日：2022-04-26

Applicant: MAKITA CORPORATION

Inventor： Fuminari Fujii ,  Yusuke Ichioka

IPC: B27B17/08 ,  H02K1/2706 ,  H02K3/34 ,  H02K5/16 ,  H02K5/22 ,  H02K9/06 ,  H02K21/02 ,  H02K5/08

Abstract: A brushless motor is at least partially located in a hermetically sealed space. An electric work machine includes a brushless motor, an output unit, a motor case, a lead wire, and a first seal. The brushless motor includes a stator, a rotor rotatable with respect to the stator, and a rotor shaft fixed to the rotor. The output unit is drivable by the rotor shaft. The motor case includes an internal space and a wiring passage. The internal space accommodates the stator and the rotor. The lead wire is located in the wiring passage connecting the internal space and an external space of the motor case. The first seal seals between the lead wire and the motor case.

公开(公告)号：US12027958B2

公开(公告)日：2024-07-02

申请号：US17724846

申请日：2022-04-20

Applicant: MAKITA CORPORATION

Inventor： Fuminari Fujii ,  Kei Kouda

IPC: H02K9/06 ,  B27B17/08 ,  H02K1/2706 ,  H02K3/34 ,  H02K5/18 ,  H02K21/02

CPC classification number: H02K9/06 ,  B27B17/08 ,  H02K1/2706 ,  H02K3/345 ,  H02K5/18 ,  H02K21/02

Abstract: An electric work machine is drivable appropriately when a brushless motor generates heat. The electric work machine includes a brushless motor including a stator, a rotor rotatable with respect to the stator, and a rotor shaft fixed to the rotor, an output unit drivable by the rotor shaft, a motor case accommodating the stator and the rotor, and a cooling fan located outside the motor case and rotatable by the rotor shaft.

公开(公告)号：US11075564B2

公开(公告)日：2021-07-27

申请号：US16739190

申请日：2020-01-10

Applicant: MAKITA CORPORATION

Inventor： Fuminari Fujii ,  Ryosuke Suzuki

IPC: H01R39/38 ,  H02K5/14 ,  H02K7/14 ,  B24B23/02

Abstract: A power tool includes a brush holder with a brush positioned more accurately with respect to a commutator. A grinder as a power tool includes a housing, a stator fixed to the housing, a rotor rotatable relative to the stator and including a commutator and a coil, a brush that comes in contact with the commutator, a brush-holding metal plate having a screw hole and holding the brush, and a screw extending through the screw hole and directly fastened to the housing.