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公开(公告)号：US20240058929A1
公开(公告)日：2024-02-22
申请号：US18361503
申请日：2023-07-28
Inventor： Masayuki NAKAHARA , Soichiro YAMADA
IPC: B25B23/147 , B25B21/02
CPC classification number: B25B23/1475 , B25B21/02
Abstract: An impact rotary tool includes a driver, a drive shaft, a hammer, an anvil, a travel distance measuring device, and a torque estimator. The driver is configured to perform a turning operation. The travel distance measuring device is configured to measure a parameter relating to a hammer travel distance through which on application of impact to the anvil by the hammer, the hammer moves away from the anvil along an axial direction from a location of the application of the impact to the anvil by the hammer. The torque estimator is configured to estimate, based on at least the parameter relating to the hammer travel distance, a torque value generated by the impact.
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公开(公告)号：US20230001548A1
公开(公告)日：2023-01-05
申请号：US17774027
申请日：2020-10-14
Inventor： Takahiro UEDA , Masayuki NAKAHARA , Takashi KUSAGAWA
IPC: B25B23/147 , B25B21/02
Abstract: An impact tool includes a motor, a control unit, an output shaft, a transmission mechanism, and an impact detection unit. The transmission mechanism includes an impact mechanism. The impact mechanism applies impacting force to the output shaft while performing an impact operation. The impact detection unit determines, based on at least one of an excitation current (current measured value) to be supplied to the motor or a torque current (current measured value) to be supplied to the motor, whether or not the impact operation is being performed. The control unit places a limit on an increase in the number of revolutions of the motor before the impact detection unit detects the impact operation and removes the limit on the increase in the number of revolutions of the motor when the impact detection unit detects the impact operation.
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公开(公告)号：US20220247338A1
公开(公告)日：2022-08-04
申请号：US17603748
申请日：2020-01-30
Inventor： Fumiiki YONEDA , Kenji HANAMURA , Masayuki NAKAHARA
IPC: H02P21/22
Abstract: An electric tool includes an electric motor (AC motor), an impact mechanism, and a control unit. The control unit includes an impact detecting unit. The control unit performs feedback control on an operation of the electric motor. In a following period after the impact detecting unit has detected that the impact mechanism has started an impact operation, the control unit changes target parameters in a preceding period before the impact detecting unit detects that the impact mechanism has started the impact operation into different target parameters. The target parameters include a control gain of the feedback control.
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Patent Agency Ranking
公开(公告)号：US20220324085A1
公开(公告)日：2022-10-13
申请号：US17621622
申请日：2020-04-30
Inventor： Masayuki NAKAHARA , Takashi KUSAGAWA , Takahiro UEDA
IPC: B25B21/02 , B25B23/147 , B25F5/00
Abstract: An impact tool includes an electric motor, an impact mechanism, an acquisition unit, and a behavior decision unit (retreat detection unit). The electric motor includes a permanent magnet and a coil. The impact mechanism performs an impact operation that generates impacting force by receiving motive power from the electric motor. The behavior decision unit makes, based on at least one of a torque current acquisition value (current measured value) which is a value of a torque current acquired by the acquisition unit or an excitation current acquisition value (current measured value) which is a value of an excitation current acquired by the acquisition unit, a decision about behavior of the impact mechanism.
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公开(公告)号：US20220216746A1
公开(公告)日：2022-07-07
申请号：US17604407
申请日：2020-01-30
Inventor： Fumiiki YONEDA , Kenji HANAMURA , Masayuki NAKAHARA
Abstract: An electric tool includes an AC motor (an electric motor) and a control unit. The AC motor includes a permanent magnet and a coil. The control unit is configured to perform control on operation of the AC motor. The control performed by the control unit includes field weakening control. In the field weakening control, the control unit causes a flux-weakening current to flow through the coil. The flux-weakening current is a current that generates, in the coil, a magnetic flux that weakens a magnetic flux of the permanent magnet.
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公开(公告)号：US20220379445A1
公开(公告)日：2022-12-01
申请号：US17774014
申请日：2020-10-14
Inventor： Masayuki NAKAHARA , Takashi KUSAGAWA , Takahiro UEDA
IPC: B25B21/02
Abstract: An impact tool includes a motor, a control unit, an output shaft, a transmission mechanism, and an impact detection unit. The transmission mechanism includes an impact mechanism. The impact mechanism performs an impact operation according to magnitude of torque applied to the output shaft. The impact detection unit determines, based on at least one of an excitation current (current measured value) to be supplied to the motor or a torque current (current measured value) to be supplied to the motor, whether or not the impact operation is being performed. The control unit fulfills an impact response function by performing restriction processing in response to detection of the impact operation by the impact detection unit as a trigger. The restriction processing includes at least one of lowering the number of revolutions of the motor or stopping rotating the motor.
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公开(公告)号：US20220193867A1
公开(公告)日：2022-06-23
申请号：US17604894
申请日：2020-01-30
Inventor： Kenji HANAMURA , Masayuki NAKAHARA , Fumiiki YONEDA
IPC: B25B21/02 , B25B23/147
Abstract: An electric power tool includes an electric motor (AC motor), an impact mechanism, an impact detecting unit, and a measuring unit. The impact mechanism performs an impact operation that generates impacting force by receiving motive power from the electric motor. The impact detecting unit determines whether or not the impact operation is being performed. The measuring unit measures at least one of a d-axis current or a q-axis current, each of which is supplied to the electric motor. The impact detecting unit determines, based on at least one of a measured value (current measured value) of the d-axis current or a measured value (current measured value) of the q-axis current, whether or not the impact operation is being performed. The measured values (current measured values) of the d-axis current and the q-axis current have been obtained by the measuring unit.
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公开(公告)号：US20180183317A1
公开(公告)日：2018-06-28
申请号：US15901490
申请日：2018-02-21
Inventor： Masayuki NAKAHARA , Toshiyuki HIRATA , Yasuhisa IHIRA , Naoki TSUJIMOTO
IPC: H02M1/08 , H02M3/155 , H02M7/5387 , H02J3/38
CPC classification number: H02M1/08 , G05F1/67 , H02J3/12 , H02J3/14 , H02J3/16 , H02J3/28 , H02J3/32 , H02J3/381 , H02M3/155 , H02M7/48 , H02M7/53871
Abstract: In a power converter, a first DC-DC converter converts a DC voltage output from a DC power supply into a DC voltage of a different level. A DC-AC converter converts a DC power output from the first DC-DC converter into an AC power and supplies the AC power to an AC load. A variable load unit connected to a current path that branches from a node between the first DC-DC converter and the DC-AC converter. A controller adjusts the variable load unit so that a total of a power consumption in the AC load and a power consumption in the variable load unit is equal to or larger than a predetermined power value.
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