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公开(公告)号：US20230216359A1
公开(公告)日：2023-07-06
申请号：US17924062
申请日：2021-04-16
Applicant: MAKITA CORPORATION
Inventor： Junya INUZUKA , Kei KOUDA
CPC classification number: H02K1/276 , H02K1/28 , H02K7/145 , H02K9/06 , H02K11/215 , H02K21/16 , B25B21/02
Abstract: An electric work machine reduces a decrease in the detection accuracy of rotation of a rotor while avoiding generation of insufficient reluctance torque. The electric work machine includes a brushless motor including a rotor and a stator, and a magnetic sensor. The rotor includes a rotor core and permanent magnets. The magnetic sensor faces a first end of the rotor core to detect rotation of the rotor. The rotor core includes a first core including the first end and first slots, and a second core including second slots. The permanent magnets are received in the corresponding first and second slots. The first core includes a first portion between first slots adjacent in a circumferential direction. The second core includes a second portion between second slots adjacent in the circumferential direction. The first portion has a dimension smaller than a dimension of the second portion in the circumferential direction.
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公开(公告)号：US20220077748A1
公开(公告)日：2022-03-10
申请号：US17529419
申请日：2021-11-18
Applicant: MAKITA CORPORATION
Inventor： Akira NIWA , Kei KOUDA
IPC: H02K7/14 , H02K11/21 , H02K3/28 , H02K1/27 , H02K3/24 , H02K29/08 , H02K29/06 , H02K11/215 , H02K5/08 , H02K5/22 , H02K9/02
Abstract: A power tool includes a brushless motor that has a stator including a tubular stator core, a rotor disposed in the tubular stator core, first and second electrically insulating members affixed to opposite ends of the stator core and a plurality of coils. A sensor-circuit board is supported by the first electrically insulating member. The first electrically insulating member is bounded by a first plane perpendicular to the rotational axis and a second plane perpendicular to the rotational axis, and the sensor-circuit board is located between the first plane and the second plane.
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公开(公告)号：US20190280560A1
公开(公告)日：2019-09-12
申请号：US16424822
申请日：2019-05-29
Applicant: MAKITA CORPORATION
Inventor： Akira NIWA , Kei KOUDA
IPC: H02K7/14 , H02K3/24 , H02K1/27 , H02K3/28 , H02K11/21 , H02K11/215 , H02K29/06 , H02K29/08 , H02K5/08 , H02K5/22 , H02K9/02
Abstract: A power tool includes a motor (8) having a stator (9), a rotor (10) and three terminals (81). The stator includes a tubular stator core (60) having six teeth (63), first and second electrically insulating members (61, 62) affixed to the stator core, and six coils (64) wound around the teeth such that three phases are defined. The three terminals are held by the first electrically insulating member and are respectively electrically connected to the three phases. All of the six coils may be formed by winding a single continuous winding wire (101) sequentially around each of the six teeth. All of the three terminals (81) may be disposed within a semicircular area of the stator core. At least a first crossover wire portion (102) of the winding wire may be disposed on the second electrically insulating member.
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公开(公告)号：US20240006933A1
公开(公告)日：2024-01-04
申请号：US18037188
申请日：2021-10-21
Applicant: MAKITA CORPORATION
Inventor： Kei KOUDA
IPC: H02K1/14 , H02K1/2786 , H02K9/22 , H02K3/32 , A01D101/00
CPC classification number: H02K1/146 , H02K1/2786 , A01D2101/00 , H02K3/325 , H02K9/227
Abstract: An electric work machine includes a stator including a stator core, an insulator fixed to the stator core, and a coil mounted on the insulator, a rotor at least a part of which is disposed on an outer circumferential side of the stator, the rotor including a magnet, a stator base including a first heat dissipation fin and supporting the stator core, and an output unit driven by the rotor.
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Patent Agency Ranking
公开(公告)号：US20230179048A1
公开(公告)日：2023-06-08
申请号：US17968845
申请日：2022-10-19
Applicant: MAKITA CORPORATION
Inventor： Kei KOUDA
Abstract: An electric work machine includes a brushless motor shortened in the direction of a motor shaft and allowing the rotational balance of a rotor to be easily adjustable. The electric work machine includes a brushless motor including a stator and a rotor, and at least one motor bearing supporting the rotor in a rotatable manner. The rotor includes a magnet being cylindrical and a magnet holder being hollow cylindrical or solid cylindrical. The magnet holder has a recess recessed in an axial direction, holds the magnet with the magnet being exposed in a radial direction, and has an axial length longer than the magnet. The magnet holder is partially exposed. The at least one motor bearing is at least partially received in the recess.
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公开(公告)号：US20220393550A1
公开(公告)日：2022-12-08
申请号：US17724846
申请日：2022-04-20
Applicant: MAKITA CORPORATION
Inventor： Fuminari FUJII , Kei KOUDA
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.
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公开(公告)号：US20220085698A1
公开(公告)日：2022-03-17
申请号：US17418088
申请日：2019-12-20
Applicant: MAKITA CORPORATION
Inventor： Akira NIWA , Kei KOUDA
Abstract: An electric work machine in one aspect of the present disclosure includes a motor, a driver, and a temperature sensor. The motor includes a stator, and a rotor. The stator includes a cylindrical body, a tooth, and a coil. The cylindrical body includes a first inner circumferential surface. The tooth is disposed to stand on the first inner circumferential surface. The coil is wound around the tooth. The coil generates a magnetic force in response to receiving an electric power. The temperature sensor is installed in/on the tooth.
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公开(公告)号：US20210057968A1
公开(公告)日：2021-02-25
申请号：US17090240
申请日：2020-11-05
Applicant: MAKITA CORPORATION
Inventor： Kei KOUDA , Akira NAITO , Hideki ABE
Abstract: An electric work machine includes a brushless motor including a stator including a stator core, an electrical insulator located on the stator core, and at least one coil wound around the stator core with the electrical insulator in between, and a rotor rotatable with respect to the stator, and an output unit drivable by the brushless motor. The stator core has a through-hole and/or a recess to lock rotation of the stator with a screw.
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公开(公告)号：US20160226339A1
公开(公告)日：2016-08-04
申请号：US15002652
申请日：2016-01-21
Applicant: MAKITA CORPORATION
Inventor： Akira NIWA , Kei KOUDA
CPC classification number: H02K7/145 , H02K1/14 , H02K1/27 , H02K3/24 , H02K3/28 , H02K5/08 , H02K5/225 , H02K9/02 , H02K11/21 , H02K11/215 , H02K29/06 , H02K29/08 , H02K2203/09 , H02K2211/03
Abstract: A power tool (1) includes a brushless motor (8) having a stator (9) and a rotor (10). The stator (9) includes: a tubular stator core (60); front and rear insulators (61, 62) fixed to the stator core; and coils (64), which are wound around a plurality of teeth (63) on the stator core. The rotor (10) includes: a rotor core (67) disposed within the stator; a rotary shaft (11) fixed to the rotor core; and one or more permanent magnets (68) fixed to the rotor core. A sensor-circuit board (65) detects the position(s) of the permanent magnet(s) and is fixed to the stator. One or more notched parts (91) is/are formed, in an outer circumference of the sensor-circuit board, between circumferentially-adjacent teeth in an axial direction of the stator. The notch part(s) allow(s) air for cooling the brushless motor to pass more easily through the interior of the stator.
Abstract translation: 电动工具（1）包括具有定子（9）和转子（10）的无刷电动机（8）。 定子（9）包括：管状定子芯（60）; 固定在所述定子铁芯上的前后绝缘体（61,62） 以及卷绕在定子铁芯上的多个齿（63）周围的线圈（64）。 转子（10）包括：设置在定子内的转子芯（67）; 固定在转子芯上的旋转轴（11）; 和一个或多个固定到转子芯上的永磁体（68）。 传感器电路板（65）检测永磁体的位置并固定在定子上。 在传感器电路板的外周中，在定子的轴向上在周向相邻的齿之间形成有一个或多个切口部（91）。 切口部分允许空气冷却无刷电动机以更容易地通过定子内部。
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