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公开(公告)号：US20220364555A1
公开(公告)日：2022-11-17
申请号：US17770725
申请日：2020-10-28
Applicant: MAKITA CORPORATION
Inventor： Makito TERAMOTO , Tomohiro HACHISUKA , Noriyuki NISHIDO , Kei KOUDA
Abstract: An air compressor includes a motor provided with a basic insulation, a first air compressing unit and a second air compressing unit that are driven by the motor, at least two tanks, and a discharge port. The at least two tanks are connected to the first air compressing unit and the second air compressing unit, store air compressed by the first air compressing unit and the second air compressing unit, and are connected to one another in series. The discharge port is disposed to a tank positioned on a most downstream of supplied compressed air and discharges the compressed air. The motor, the first air compressing unit and the second air compressing unit, and a tank on an upstream side with respect to the tank positioned on the most downstream are electrically insulated from the tank positioned on the most downstream and the discharge port.
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公开(公告)号：US20230238856A1
公开(公告)日：2023-07-27
申请号：US18127293
申请日：2023-03-28
Applicant: MAKITA CORPORATION
Inventor： Kei KOUDA , Hideki ABE
CPC classification number: H02K7/003 , H02K5/08 , H02K5/161 , H02K21/16 , A01D34/78 , H02K7/083 , F16C3/02
Abstract: An electric work machine, such as a lawn mower includes a motor case (22) fixed inside a main-body housing (10). A brushless motor (21) is housed inside the motor case (22) and includes a stator (23) having a stator core (40), coils (45), and upper and lower insulators (42, 43), and a rotor (24) disposed inward of the stator (23) and having a rotary shaft (25). A spindle (17) is driven by the rotary shaft (25). The motor case (22) holds the stator (23) and axially supports the rotary shaft (25) via bearings (68, 76). One or more insulating members, such as an insulating cap (67) and/or a resin layer (78), provide electrical insulation between the stator core (40) and the rotary shaft (25).
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公开(公告)号：US20200052558A1
公开(公告)日：2020-02-13
申请号：US16460149
申请日：2019-07-02
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：US20250055360A1
公开(公告)日：2025-02-13
申请号：US18928528
申请日：2024-10-28
Applicant: MAKITA CORPORATION
Inventor： Kei KOUDA
Abstract: An electric work machine (1) includes: a brushless motor having a stator disposed around a rotor (30); and an output part driven by the rotor. The rotor has a rotor core (31) and first and second magnetic-pole parts (34S, 34N) disposed around a circumferential direction of the rotor core. When the induced voltage of the brushless motor is given as Va, the power-supply voltage of the brushless motor is given as Vb, the rotational speed of the brushless motor is given as ω, a first induced voltage constant, which is expressed by Va/ω, is given as Ea [V/krpm], a pole-pairs count, which is the number of the first magnetic-pole parts or the second magnetic-pole parts, is given as Pi, and a second induced voltage constant, which is expressed as Ea/Pi, is given as Eb [V/krpm·pole-pairs count], the motor satisfies the condition: Eb≤0.025×Vb.
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公开(公告)号：US20230231457A1
公开(公告)日：2023-07-20
申请号：US17924430
申请日：2021-04-16
Applicant: MAKITA CORPORATION
Inventor： Kei KOUDA
CPC classification number: H02K21/16 , H02K1/146 , H02K1/276 , H02K7/145 , H02K9/06 , H02K11/215 , H02K11/33 , H02K15/022 , H02K2211/03
Abstract: An electric work machine includes a first brushless motor including a first stator and a first rotor combined with the first stator, and a controller. The first stator includes a first stator core and multiple first coils wound around multiple teeth on the stator core. The controller magnetizes the teeth to cause the first rotor to rotate about a rotation axis. In a plane orthogonal to the rotation axis, the first stator core has the same shape as a second stator core in a second stator used in a second brushless motor in another electric work machine. The first rotor can be combined with the second stator. The first rotor has a different number of poles from a second rotor used in the second brushless motor.
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Patent Agency Ranking
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：US20230369940A1
公开(公告)日：2023-11-16
申请号：US18227380
申请日：2023-07-28
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
CPC classification number: H02K7/145 , H02K11/21 , H02K3/28 , H02K1/27 , H02K3/24 , H02K29/08 , H02K29/06 , H02K11/215 , H02K5/08 , H02K5/225 , H02K9/02 , H02K1/14
Abstract: A power tool includes a brushless motor having a stator and a rotor. The stator includes a stator core having teeth, first and second insulators fixed to the stator core, and coils respectively wound around the teeth, all of the coils being wound around the first and second insulators. The rotor includes a rotor core disposed in the interior of the stator, a rotary shaft fixed to the rotor core, and one or more permanent magnets fixed to the rotor core. Power supply lines are configured to respectively supply current to the coils. Fusing terminals are fixed to the first insulator members. The fusing members respectively pinch the power supply lines and are thereby respectively electrically connected to the power supply lines.
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公开(公告)号：US20230076631A1
公开(公告)日：2023-03-09
申请号：US17929802
申请日：2022-09-06
Applicant: MAKITA CORPORATION
Inventor： Kei KOUDA
Abstract: An electric work machine (1) includes: a brushless motor having a stator disposed around a rotor (30); and an output part driven by the rotor. The rotor has a rotor core (31) and first and second magnetic-pole parts (34S, 34N) disposed around a circumferential direction of the rotor core. When the induced voltage of the brushless motor is given as Va, the power-supply voltage of the brushless motor is given as Vb, the rotational speed of the brushless motor is given as ω, a first induced voltage constant, which is expressed by Va/ω, is given as Ea [V/krpm], a pole-pairs count, which is the number of the first magnetic-pole parts or the second magnetic-pole parts, is given as Pi, and a second induced voltage constant, which is expressed as Ea/Pi, is given as Eb [V/krpm pole-pairs count], the motor satisfies the condition: Eb≤0.025×Vb.
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