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公开(公告)号：US12191684B2
公开(公告)日：2025-01-07
申请号：US18126584
申请日：2023-03-27
Applicant: MAKITA CORPORATION
Inventor： Tadahiko Kobayakawa , Hayato Kano , Yoshitaka Ichikawa
Abstract: A system in one aspect of the present disclosure includes a battery pack and an electric work machine. The battery pack includes a battery, a first interface, a first memory and a first controller. The first controller is configured to transmit battery data identifying a type of the battery pack. The electric work machine includes a motor, a second interface, a switching element, a manual switch, a second memory and a second controller. The second controller is configured to transmit electric apparatus data identifying a type of the electric work machine.
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公开(公告)号：US11979049B2
公开(公告)日：2024-05-07
申请号：US17274396
申请日：2019-09-11
Applicant: MAKITA CORPORATION
Inventor： Yoshitaka Ichikawa , Tadahiko Kobayakawa
CPC classification number: H02J7/00714 , A01D34/68 , A01D34/78 , H01M10/48 , H02J7/0044 , H02K7/145 , H02K11/33
Abstract: An electric work machine (1), such as a power tool, comprises a motor (50), a manipulatable part (12) such as a trigger switch, and a control part (36). The motor is energized with electric current supplied by a battery pack (22). By manipulating the manipulatable part, the control part energizes the motor. The control part also acquires information concerning the state of the battery from the battery pack, and, if appropriate based on the information obtained from the battery pack, takes measures (such as limiting a discharge current) to restrain, delay and possibly avert the performance of a protection (discharge-prohibited) operation by the battery pack.
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公开(公告)号：US10131047B2
公开(公告)日：2018-11-20
申请号：US14399647
申请日：2013-05-07
Applicant: MAKITA CORPORATION
Inventor： Kenya Yanagihara , Ying Yang , Yoshitaka Ichikawa , Yuki Kawai
Abstract: A driving tool, such as a nailer, includes a compression piston slidably disposed within a compression cylinder. An electric motor and a crank mechanism reciprocally drive the compression piston within the compression cylinder, and a sensor directly or indirectly detects the position of the compression piston. Prior to the start of a driving operation, a return operation is performed to move the compression piston to its bottom dead center when the sensor detects that the compression piston is located at a position other its bottom dead center.
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公开(公告)号：US11476790B2
公开(公告)日：2022-10-18
申请号：US16715560
申请日：2019-12-16
Applicant: MAKITA CORPORATION
Inventor： Yoshitaka Ichikawa , Akihiro Nakamoto
IPC: H02P29/024 , H02P27/06 , A01G3/06 , A01G3/053 , B25F5/02
Abstract: An electric working machine in one aspect of the present disclosure includes two or more circuits and a control circuit. The control circuit executes two or more diagnoses one by one in order. The diagnoses at least include a first diagnosis and a second diagnosis. The first diagnosis diagnoses a first circuit. The second diagnosis diagnoses a second circuit. The control circuit executes the first diagnosis or the second diagnosis at a first diagnosis timing. The control circuit executes the first diagnosis or the second diagnosis at a second diagnosis timing. The second diagnosis timing follows the first diagnosis timing.
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公开(公告)号：US11235453B2
公开(公告)日：2022-02-01
申请号：US16052747
申请日：2018-08-02
Applicant: MAKITA CORPORATION
Inventor： Yoshitaka Ichikawa , Goshi Ishikawa , Shinichi Hira , Yasuhito Kawai , Masahiro Watanabe , Takuya Kusakawa
Abstract: An electric working machine in one aspect of the present disclosure includes a motor, a controller, and a setter. The controller is configured to change a rotational state of the motor, in response to an establishment of a condition for change after the motor is initiated, from a low speed rotation to a high speed rotation. The setter is configured to set, based on a situation in the motor in the low speed rotation, a control variable of the motor in the high speed rotation and/or the condition for change.
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Patent Agency Ranking
公开(公告)号：US12057719B2
公开(公告)日：2024-08-06
申请号：US17275504
申请日：2019-09-12
Applicant: MAKITA CORPORATION
Inventor： Yoshitaka Ichikawa , Akihiro Nakamoto , Minoru Gyoda , Hayato Kano , Toru Yamada , Hitoshi Suzuki
CPC classification number: H02J7/0029 , H01M10/48 , H02J7/00032 , H02J7/0063 , H02P3/06
Abstract: A battery pack is configured to supply electric power to an electric work machine, such as a power tool or outdoor power equipment. The battery pack includes a first battery-signal terminal and a second battery-signal terminal. The first battery-signal terminal outputs, to the electric work machine, a first signal indicating that discharging is to be prohibited or permitted. The second battery-signal terminal outputs, to the electric work machine, a second signal indicating that discharging is to be prohibited or permitted. Thus, two communication paths are provided for transmitting signals to permit or prohibit discharging of the battery pack.
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公开(公告)号：US11641798B2
公开(公告)日：2023-05-09
申请号：US16787140
申请日：2020-02-11
Applicant: MAKITA CORPORATION
Inventor： Yoshitaka Ichikawa
IPC: A01D34/78 , A01D34/68 , B25F3/00 , B25F5/00 , A01D34/416 , A01D101/00
CPC classification number: A01D34/78 , A01D34/6806 , B25F3/00 , B25F5/001 , A01D34/416 , A01D2101/00
Abstract: An electric working machine includes an attachment portion, a motor, and a controller. Multiple types of tip tools are alternatively attached to the attachment portion. The motor drives the tip tool attached to the attachment portion. The controller has first start control and second start control. The controller is configured to execute the first start control so as to determine the type of the tip tool when not having tool type information, and configured to execute the second start control when having the tool type information.
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公开(公告)号：US11533841B2
公开(公告)日：2022-12-27
申请号：US16778276
申请日：2020-01-31
Applicant: MAKITA CORPORATION
Inventor： Tatsuya Hata , Hiroshi Nojiri , Yoshitaka Ichikawa
Abstract: One aspect of the present disclosure provides an electric working machine. The electric working machine includes a driver, a motor, and a control circuit. Attached to the driver is a selected tool. The motor drives the selected tool attached to the driver. The control circuit sets a target rotational frequency based on the selected tool. The control circuit controls the motor to rotate at the target rotational frequency.
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公开(公告)号：US10348227B2
公开(公告)日：2019-07-09
申请号：US15278523
申请日：2016-09-28
Applicant: MAKITA CORPORATION
Inventor： Yoshitaka Ichikawa
IPC: H02P3/14 , H02P6/24 , H02K11/215 , H02P23/20 , B25F5/00 , H02P27/08 , H02P29/024
Abstract: One aspect of the present disclosure relates to an electric power tool including a motor, an operation unit, a bridge circuit, and a control unit. The control unit performs a brake control when the motor is braked, and performs a regenerative current inhibition control before stopping the brake control when a drive command is inputted to the operation unit while the brake control is performed.
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公开(公告)号：US09621081B2
公开(公告)日：2017-04-11
申请号：US14978697
申请日：2015-12-22
Applicant: MAKITA CORPORATION
Inventor： Yuki Kawai , Yoshitaka Ichikawa , Hirokatsu Yamamoto , Ying Yang
CPC classification number: H02P6/157 , H02P6/085 , H02P6/14 , H02P27/08 , H02P2201/03
Abstract: A motor-driven apparatus in one aspect of the present disclosure includes: a brushless motor; a full-wave rectifier circuit; a drive circuit; a controller; and a forcible stop unit. The forcible stop unit performs a forcible stop control to temporarily forcibly stop a switching operation of a plurality of switching elements during a stop period when a full-wave rectified voltage is smaller than an induced voltage generated by a plurality of coils, and the switching operation of the plurality of switching elements is to be stopped.
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