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公开(公告)号：US12030161B2
公开(公告)日：2024-07-09
申请号：US17766899
申请日：2020-09-18
Inventor： Itaru Murui , Kotaro Momoeda , Kota Kitamura , Naoki Tsujimoto , Akito Nakamura
IPC: B25B23/147 , B25B21/02 , B25F5/00
CPC classification number: B25B23/147 , B25B21/02 , B25F5/001
Abstract: An electric tool includes an output shaft and a controller. The output shaft is configured to hold a tip tool and be rotated by motive power provided from an electric motor with the output shaft holding the tip tool. The controller is configured to control rotation of the output shaft in accordance with pressing force in a direction from a tip end of the tip tool toward the output shaft. The electric tool has, as an operation range, a restriction range in which rotation of the output shaft is restricted in a state where the pressing force is less than or equal to a prescribed value.
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公开(公告)号：US12121981B2
公开(公告)日：2024-10-22
申请号：US17766914
申请日：2020-09-18
Inventor： Kota Kitamura , Itaru Murui , Naoki Tsujimoto , Kotaro Momoeda , Akito Nakamura
Abstract: An electric tool includes a pressure-sensitive sensor, a support, an output shaft, and a controller. The pressure-sensitive sensor is configured to sense pressing force which is externally provided. The support supports the pressure-sensitive sensor. The output shaft is configured to hold a tip tool and be rotated relative to the support by motive power provided from an electric motor with the output shaft holding the tip tool. The controller is configured to control rotation of the output shaft in accordance with an output according to the pressing force, the output being output from the pressure-sensitive sensor.
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公开(公告)号：US10530224B2
公开(公告)日：2020-01-07
申请号：US15537818
申请日：2015-12-09
Inventor： Kota Kitamura , Hidenori Shimizu , Atsushi Takeyama , Motoharu Muto , Daiju Kinoshita
Abstract: A motor includes: a stator; a rotor axially aligned with the stator; a circuit board; and a heat dissipating plate. The stator includes: an iron core including teeth; an insulator covering one end surface, in the axial direction, of the iron core; and a coil wound around the teeth. The insulator includes an electrically insulating material having a lower rate of heat transfer than a material included in the iron core. The heat dissipating plate is attached to the insulator in a state in which the heat dissipating plate is in contact with the insulator without being in contact with the iron core, and the circuit board is attached to the heat dissipating plate in a state in which the circuit board is in contact with the heat dissipating plate without being in contact with the iron core.
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Patent Agency Ranking
公开(公告)号：US12266986B2
公开(公告)日：2025-04-01
申请号：US17913401
申请日：2021-02-05
Inventor： Akito Nakamura , Kota Kitamura
Abstract: A brushless motor is an inner rotor type brushless motor. The brushless motor includes a plurality of phase coils of multiple phases arranged around a rotation axis, and a plurality of terminals configured to connect the plurality of phase coils of multiple phases to a switching circuit. The plurality of terminals are located inside a circumscribed circle of the plurality of phase coils of multiple phases.
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公开(公告)号：US20200313511A1
公开(公告)日：2020-10-01
申请号：US16828690
申请日：2020-03-24
Inventor： Itaru Murui , Masari Muramatsu , Motoharu Muto , Kota Kitamura
IPC: H02K7/14 , B25F5/02 , B25B21/02 , H02K11/215
Abstract: A motor for electric power tools according to an embodiment includes: a rotor having a rotational shaft; a stator having a coil to rotate the rotor; a first substrate mounting a sensor element to detect a rotational position of the rotor; and a second substrate mounting a switching element to change, based on a result of detection by the sensor element, a conducting direction in which a current flows with respect to the coil. The first substrate and the second substrate are arranged side by side along, and intersect at right angles with, the rotational shaft.
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公开(公告)号：US12053864B2
公开(公告)日：2024-08-06
申请号：US17778308
申请日：2020-09-18
Inventor： Itaru Murui , Shota Fujii , Keita Okamoto , Naoki Tsujimoto , Kota Kitamura , Kotaro Momoeda
IPC: B25B23/147 , B25B21/02 , H02P23/00
CPC classification number: B25B23/1475 , B25B21/02 , H02P23/0004
Abstract: An electric tool system includes a motor, a control unit, and an output shaft. The motor includes a stator and a rotor. The control unit performs vector control on the motor. The control unit includes a first acquisition unit, a second acquisition unit, and a command value generation unit. The command value generation unit calculates, based on a torque current acquisition value (current measured value) as a value related to a torque current as acquired by the first acquisition unit and an acceleration acquisition value as a value related to acceleration of the rotor as acquired by the second acquisition unit, at least one of a command value of the torque current to be supplied to the motor or a command value of an excitation current to be supplied to the motor.
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公开(公告)号：US11632017B2
公开(公告)日：2023-04-18
申请号：US16828690
申请日：2020-03-24
Inventor： Itaru Murui , Masari Muramatsu , Motoharu Muto , Kota Kitamura
IPC: H02K7/14 , B25B21/02 , B25F5/02 , H02K11/215
Abstract: A motor for electric power tools according to an embodiment includes: a rotor having a rotational shaft; a stator having a coil to rotate the rotor; a first substrate mounting a sensor element to detect a rotational position of the rotor; and a second substrate mounting a switching element to change, based on a result of detection by the sensor element, a conducting direction in which a current flows with respect to the coil. The first substrate and the second substrate are arranged side by side along, and intersect at right angles with, the rotational shaft.
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公开(公告)号：US10355538B2
公开(公告)日：2019-07-16
申请号：US15521034
申请日：2015-10-09
Inventor： Kota Kitamura , Hidenori Shimizu , Atsushi Takeyama , Motoharu Muto , Hiroyuki Tsubakimoto , Koichi Hashimoto
Abstract: A brushless motor includes: a stator core having a cylindrical yoke portion and a teeth portion having a shape protruding from an inner circumferential surface of the yoke portion; and a rotor that is disposed inside the stator core, spaced apart from the teeth portion, and uses a center axis of the yoke portion as an axis of rotation. The yoke portion includes, on its outer circumferential surface, a notch portion at a position on the back side of the teeth portion. The notch portion has a circumferential width smaller than a circumferential width of the teeth portion.
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