公开(公告)号：US12249875B2

公开(公告)日：2025-03-11

申请号：US17743768

申请日：2022-05-13

Applicant: MAKITA CORPORATION

Inventor： Junya Inuzuka ,  Yusuke Ichioka

IPC: H02K11/215 ,  A01D34/68 ,  A01D34/78 ,  A01D101/00 ,  H02K21/22

Abstract: An electric work machine can appropriately detect rotation of a rotor. The electric work machine includes a stator including a stator core, an insulator fixed to the stator core, and a coil attached to the insulator, a rotor rotatable about a rotation axis and including a rotor core and a magnet fixed to the rotor core, a stator base supporting the stator, a sensor board supported by the stator base and including a magnetic sensor that detects the magnet, and an output unit drivable by the rotor.

公开(公告)号：US11750064B2

公开(公告)日：2023-09-05

申请号：US17704141

申请日：2022-03-25

Applicant: MAKITA CORPORATION

Inventor： Junya Inuzuka

IPC: H02K7/14 ,  H02K1/16 ,  H02K1/18 ,  H02K11/33 ,  H02K3/34 ,  H02K3/46 ,  B25F5/00

CPC classification number: H02K7/145 ,  H02K1/16 ,  H02K1/18 ,  H02K3/34 ,  H02K3/46 ,  H02K11/33 ,  B25F5/00

Abstract: In the brushless motor disposed in a hammer drill, while a stator core of a stator is formed by joining a plurality of divided cores divided in a circumferential direction, varnishes are applied over a coil and joining portions between the divided cores.

公开(公告)号：US10985622B2

公开(公告)日：2021-04-20

申请号：US16998043

申请日：2020-08-20

Applicant: MAKITA CORPORATION

Inventor： Junya Inuzuka

IPC: H02K9/06 ,  H02K1/27 ,  B25D11/12 ,  B25D16/00 ,  B25F5/02 ,  H02K1/30 ,  H02K7/14

Abstract: A rotor has reduced weight. A hammer drill includes a motor including a stator and a rotor rotatable relative to the stator. The rotor includes a rotor core having a first space, and a permanent magnet fixed on the rotor core.

公开(公告)号：US10784729B2

公开(公告)日：2020-09-22

申请号：US15963568

申请日：2018-04-26

Applicant: MAKITA CORPORATION

Inventor： Junya Inuzuka

IPC: H02K1/27 ,  H02K9/06 ,  B25D11/12 ,  B25D16/00 ,  B25F5/02 ,  H02K1/30 ,  H02K7/14

Abstract: A rotor has reduced weight. A hammer drill includes a motor including a stator and a rotor rotatable relative to the stator. The rotor includes a rotor core having a first space, and a permanent magnet fixed on the rotor core.

公开(公告)号：US09948162B2

公开(公告)日：2018-04-17

申请号：US14481237

申请日：2014-09-09

Applicant: MAKITA CORPORATION

Inventor： Tatsuya Nagahama ,  Junya Inuzuka ,  Takashi Momose

IPC: H02K3/28 ,  H02K7/14 ,  B25F5/00 ,  H02K3/52 ,  H02K5/22 ,  H02K29/08 ,  H02K7/116 ,  H02K11/215 ,  H02K11/27

CPC classification number: H02K7/145 ,  H02K3/28 ,  H02K3/522 ,  H02K5/225 ,  H02K7/116 ,  H02K11/215 ,  H02K11/27 ,  H02K29/08 ,  H02K2203/03 ,  H02K2203/09

Abstract: A power tool (1; 90) includes a motor (17) having a stator (18) and a rotor (19). The stator (18) includes front and rear insulators (21, 22) respectively disposed forward and rearward of a stator core (20) in an axial direction thereof. At least six coils (23) are respectively wound on the stator (18) such that the coils (23) are wound through the front and rear insulators (21, 22). Winding wires (23a) respectively electrically connect circumferentially-adjacent pairs of the coils (23). A short circuiting device (25) short circuits respective pairs of windings (23a) that are located diagonally or diametrically across from one another.

公开(公告)号：US12095312B2

公开(公告)日：2024-09-17

申请号：US17824474

申请日：2022-05-25

Applicant: MAKITA CORPORATION

Inventor： Junya Inuzuka

IPC: H02K11/20 ,  H02K1/16 ,  H02K3/12 ,  H02K7/00 ,  H02K11/215 ,  H02K11/30

CPC classification number: H02K11/215 ,  H02K1/16 ,  H02K3/12 ,  H02K7/003 ,  H02K11/20 ,  H02K11/30

Abstract: A sensor board is downsized. An electric work machine includes a stator, a rotor rotatable about a rotation axis, magnetic sensors, a sensor board supporting the magnetic sensors, and an output unit drivable by the rotor. The stator includes a stator core, an insulator, and coils including first-, second-, and third-phase coils. The rotor includes a rotor core and magnets fixed to the rotor core. The magnetic sensors detect the magnets and include, in a circumferential direction, a first magnetic sensor aligned with at least a portion of a first coil pair, a second magnetic sensor aligned with at least a portion of a second coil pair, and a third magnetic sensor aligned with at least a portion of a third coil pair.

公开(公告)号：US11715995B2

公开(公告)日：2023-08-01

申请号：US17122601

申请日：2020-12-15

Applicant: MAKITA CORPORATION

Inventor： Tatsuya Nagahama ,  Junya Inuzuka ,  Takashi Momose

IPC: H02K29/08 ,  H02K7/14 ,  H02K5/04 ,  H02K11/215 ,  H02K3/28 ,  H02K3/52 ,  H02K5/22 ,  H02K7/116 ,  H02K11/27 ,  B25F5/02 ,  B25F5/00

CPC classification number: H02K7/145 ,  B25F5/02 ,  H02K3/28 ,  H02K3/522 ,  H02K5/04 ,  H02K5/225 ,  H02K7/116 ,  H02K11/215 ,  H02K11/27 ,  H02K29/08 ,  B25F5/00 ,  H02K2203/03 ,  H02K2203/09

Abstract: A power tool (1; 90) includes a motor (17) having a stator (18) and a rotor (19). The stator (18) includes front and rear insulators (21, 22) respectively disposed forward and rearward of a stator core (20) in an axial direction thereof. At least six coils (23) are respectively wound on the stator (18) such that the coils (23) are wound through the front and rear insulators (21, 22). Winding wires (23a) respectively electrically connect circumferentially-adjacent pairs of the coils (23). A short circuiting device (25) short circuits respective pairs of windings (23a) that are located diagonally or diametrically across from one another.

公开(公告)号：US11095174B2

公开(公告)日：2021-08-17

申请号：US16998043

申请日：2020-08-20

Applicant: MAKITA CORPORATION

Inventor： Junya Inuzuka

IPC: H02K9/06 ,  H02K1/27 ,  B25D11/12 ,  B25D16/00 ,  B25F5/02 ,  H02K1/30 ,  H02K7/14

Abstract: A rotor has reduced weight. A hammer drill includes a motor including a stator and a rotor rotatable relative to the stator. The rotor includes a rotor core having a first space, and a permanent magnet fixed on the rotor core.

公开(公告)号：US10903718B2

公开(公告)日：2021-01-26

申请号：US15919615

申请日：2018-03-13

Applicant: MAKITA CORPORATION

Inventor： Tatsuya Nagahama ,  Junya Inuzuka ,  Takashi Momose

IPC: H02K7/14 ,  B25F5/02 ,  H02K5/04 ,  H02K3/52 ,  H02K3/28 ,  H02K5/22 ,  H02K29/08 ,  H02K7/116 ,  H02K11/215 ,  H02K11/27 ,  B25F5/00

Abstract: A power tool (1; 90) includes a motor (17) having a stator (18) and a rotor (19). The stator (18) includes front and rear insulators (21, 22) respectively disposed forward and rearward of a stator core (20) in an axial direction thereof. At least six coils (23) are respectively wound on the stator (18) such that the coils (23) are wound through the front and rear insulators (21, 22). Winding wires (23a) respectively electrically connect circumferentially-adjacent pairs of the coils (23). A short circuiting device (25) short circuits respective pairs of windings (23a) that are located diagonally or diametrically across from one another.

公开(公告)号：US09755490B2

公开(公告)日：2017-09-05

申请号：US14527050

申请日：2014-10-29

Applicant: MAKITA CORPORATION

Inventor： Junya Inuzuka

IPC: H02K1/28 ,  H02K15/03 ,  B25F5/00 ,  H02K1/27 ,  H02K7/04 ,  H02K9/06 ,  H02K15/12

CPC classification number: H02K15/03 ,  B25F5/00 ,  B25F5/008 ,  H02K1/276 ,  H02K1/28 ,  H02K7/04 ,  H02K9/06 ,  H02K15/12

Abstract: A power tool includes a housing and a brushless motor, the brushless motor having a stator and a rotor inside the housing, the rotor including a rotor core having a plurality of axially extending through holes and a permanent magnet in each of the plurality of through holes. The rotor is provided with at least one positioning structure by which the rotor core can be held in a desired circumferential orientation while the permanent magnets are inserted into the through holes.