公开(公告)号：US20230291274A1

公开(公告)日：2023-09-14

申请号：US18155854

申请日：2023-01-18

Applicant: MAKITA CORPORATION

Inventor： Hiroki NAGAI ,  Takaya YAMADA ,  Yuya SANO

IPC: H02K7/04 ,  H02K7/14 ,  H02K21/16

CPC classification number: H02K7/04 ,  H02K7/145 ,  H02K21/16 ,  B27B9/00

Abstract: A power tool includes a resin member in a rotor that is less susceptible to breaking. A power tool includes a stator, a rotor rotatable relative to the stator at a speed of 30000 rpm or greater, and an output unit drivable by the rotor. The stator includes a stator core, an insulator fixed to the stator core, and a coil held on the insulator. The rotor includes a rotor core having a slot, a permanent magnet received in the slot in the rotor core, and a resin member fixing the rotor core and the permanent magnet. The resin member includes an annular portion protruding from an end face of the rotor core. The annular portion includes a cut portion.

公开(公告)号：US20240372430A1

公开(公告)日：2024-11-07

申请号：US18582797

申请日：2024-02-21

Applicant: MAKITA CORPORATION

Inventor： Katsuyuki NIINOMI ,  Takaya YAMADA ,  Kengo UMEMURA

IPC: H02K5/20 ,  B24B23/02 ,  B24B47/12 ,  B25F5/00 ,  H02K1/18 ,  H02K5/14 ,  H02K7/08 ,  H02K7/14 ,  H02K9/06 ,  H02K9/28

Abstract: A power tool includes a motor and a housing. The motor includes a rotor rotatable in one direction about a motor rotation axis and including a rotor shaft to which a fan and a commutator are fixed, a stator surrounding the rotor, and a carbon brush in contact with the commutator. The housing supports the stator and includes a cylinder, a bottom connected to the cylinder, a vent in the bottom, and a rib protruding from the bottom. P1

公开(公告)号：US20210296955A1

公开(公告)日：2021-09-23

申请号：US17186523

申请日：2021-02-26

Applicant: MAKITA CORPORATION

Inventor： Takaya YAMADA ,  Keisuke HANE ,  Naoto SAKURAI ,  Tatsuya MAEDA

IPC: H02K3/28 ,  H02K7/14 ,  H02K3/12 ,  H02K3/34 ,  H02K1/16

Abstract: An electric work machine (1; 301), such as a power tool, includes a motor (8; 8B) having a rotor (19), which is rotatable relative to a stator (20; 20B). The stator includes: a stator core (32; 120) having teeth (37; 130); an insulator (33, 34; 122) supported by the stator core; coils (35, 112) wound through the insulator and around the teeth; a first wire (101; 149) that connects a first set of the coils; and a second wire (102; 149) that connects a second set of the coils. At least a portion of the first wire and at least a portion of the second wire are disposed in a same range in a circumferential direction of the stator. In at least a portion of that range, the first wire and the second wire are non-contactable and/or incapable of relative movement, whereby premature wire deterioration can be reduced.