公开(公告)号：US11133766B2

公开(公告)日：2021-09-28

申请号：US16832443

申请日：2020-03-27

Applicant: MAKITA CORPORATION

Inventor： Hitoshi Suzuki ,  Akihiro Nakamoto

IPC: H02P27/06 ,  B25F5/02 ,  B25B21/02

Abstract: An electric working machine in one aspect of the present disclosure includes a driving device, a controller, a control power source, and an operation state determiner. The control power source includes a first converter and a second converter. The control power source transitions to a first conversion state when the operation state determiner determines that the controller is in a control operation state. The control power source in the first conversion state supplies a first control current to the controller. The control power source transitions to a second conversion state when the operation state determiner determines that the controller is in a low power operation state. The control power source in the second conversion state (i) stops operation of the first converter, and (ii) supplies a second control current to the controller.

公开(公告)号：US10350720B2

公开(公告)日：2019-07-16

申请号：US15478691

申请日：2017-04-04

Applicant: MAKITA CORPORATION

Inventor： Akihiro Nakamoto

IPC: H02P3/06 ,  B24B23/00 ,  B23Q11/00 ,  B24B23/02 ,  B25F5/00 ,  H02P29/024 ,  H02P3/18 ,  H02P7/295 ,  H02P25/14 ,  H02P3/12 ,  H02P27/04

Abstract: An electric working machine comprises a motor, a switch, a drive device, a brake device, and a failure determiner. The switch is configured for operation by a user, has an on-state and an off-state. The drive device is configured to drive the motor in response to the switch being placed in the on-state. The brake device is configured to control deceleration of the motor to a stopped state in response to the switch being placed in the off-state. The failure determiner is configured to monitor deceleration of the motor during controlled deceleration and to determine whether the brake device has failed based on the monitored deceleration.

公开(公告)号：US11926031B2

公开(公告)日：2024-03-12

申请号：US17418595

申请日：2019-12-20

Applicant: MAKITA CORPORATION

Inventor： Akihiro Nakamoto ,  Hitoshi Suzuki

IPC: H02P23/20 ,  B25F5/00 ,  H02P6/24

CPC classification number: B25F5/00 ,  H02P6/24

Abstract: An electric work machine includes a motor, a manipulator, a first switch, a second switch, and a control circuit. The manipulator is on-operated or off-operated by a user of the electric work machine. Each of the first switch and the second switch is turned on or off in response to the manipulator being on-operated or off-operated. The control circuit executes a motor control process in accordance with a computer program. The control circuit receives first switch information from the first switch, and receives second switch information from the second switch. The motor control process outputs a drive command for driving the motor in response to the first switch information and the second switch information indicating that the manipulator is on-operated.

公开(公告)号：US12142971B2

公开(公告)日：2024-11-12

申请号：US17624775

申请日：2020-06-17

Applicant: MAKITA CORPORATION

Inventor： Akihiro Nakamoto

IPC: H02K11/28 ,  B25D16/00 ,  H02K7/14

Abstract: An electric powered work machine in one aspect of the present disclosure includes a motor, a current-carrying path, a switching circuit, a circuit board, a metal case, and a heat radiation sheet. The circuit board includes a first surface, a second surface, a first hole group, a board conductive line, and a circuit arrangement area.

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

IPC: H02P1/00 ,  H01M10/48 ,  H02J7/00 ,  H02P3/00 ,  H02P3/06 ,  H02P5/00

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.

公开(公告)号：US12051986B2

公开(公告)日：2024-07-30

申请号：US16715813

申请日：2019-12-16

Applicant: MAKITA CORPORATION

Inventor： Akihiro Nakamoto ,  Hitoshi Suzuki

IPC: H02P29/024 ,  A01D34/00 ,  A01D34/47 ,  A01D34/58 ,  A01D34/84 ,  A01D34/90 ,  H02J7/00 ,  H02P29/68

CPC classification number: H02P29/0241 ,  A01D34/006 ,  A01D34/47 ,  A01D34/58 ,  A01D34/84 ,  A01D34/90 ,  H02J7/00308 ,  H02J7/0031 ,  H02J7/0047 ,  H02P29/027 ,  H02P29/68

Abstract: An electric working machine in one aspect of the present disclosure includes a motor, an information output circuit, a control circuit, and a drive stop circuit. The information output circuit outputs state information that indicates a state of the electric working machine. The control circuit executes a motor control process in accordance with a computer program. The drive stop circuit executes a motor stop operation. The motor stop operation includes disabling a permission to drive the motor by the control circuit to stop the motor in response to the state information indicating that the motor should be stopped. The motor stop operation is implemented by hardware.

公开(公告)号：US11824473B2

公开(公告)日：2023-11-21

申请号：US17462820

申请日：2021-08-31

Applicant: MAKITA CORPORATION

Inventor： Hitoshi Suzuki ,  Akihiro Nakamoto

IPC: H02P27/06 ,  B25F5/02 ,  B25B21/02

CPC classification number: H02P27/06 ,  B25F5/02 ,  B25B21/02

Abstract: An electric working machine in one aspect of the present disclosure includes a driving device, a controller, a control power source, and an operation state determiner. The control power source includes a first converter and a second converter. The control power source transitions to a first conversion state when the operation state determiner determines that the controller is in a control operation state. The control power source in the first conversion state supplies a first control current to the controller. The control power source transitions to a second conversion state when the operation state determiner determines that the controller is in a low power operation state. The control power source in the second conversion state (i) stops operation of the first converter, and (ii) supplies a second control current to the controller.

公开(公告)号：US11777377B2

公开(公告)日：2023-10-03

申请号：US16693623

申请日：2019-11-25

Applicant: MAKITA CORPORATION

Inventor： Akihiro Nakamoto

IPC: H02K11/33 ,  H01L25/07 ,  H05K1/18 ,  H02K11/00 ,  H02K11/25 ,  A01D34/78 ,  A01D34/68 ,  H01L23/40 ,  H02K9/22 ,  A01D101/00 ,  H01R12/58

CPC classification number: H02K11/33 ,  A01D34/6806 ,  A01D34/78 ,  H01L23/4006 ,  H01L25/072 ,  H02K9/223 ,  H02K11/0094 ,  H02K11/25 ,  H05K1/18 ,  A01D2101/00 ,  H01L2023/4031 ,  H01L2023/4062 ,  H01L2023/4087 ,  H01R12/58 ,  H02K2211/03 ,  H05K2201/066 ,  H05K2201/10151 ,  H05K2201/10166

Abstract: An electric working machine includes: a motor; a semiconductor element that is provided in a current path to the motor and completes or interrupts the current path; a circuit board on which the semiconductor element is mounted, a control circuit that turns on and off the semiconductor element to control energization to the motor being assembled to the circuit board; and a heat sink for dissipating heat from the semiconductor element. The semiconductor element is attached to the heat sink via a metal-based board.

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.

公开(公告)号：US11063543B2

公开(公告)日：2021-07-13

申请号：US16531519

申请日：2019-08-05

Applicant: MAKITA CORPORATION

Inventor： Akihiro Nakamoto ,  Hitoshi Suzuki

IPC: A01G20/47 ,  H02P27/06 ,  H02J7/00

Abstract: A voltage supplier in one aspect of the present disclosure includes a first voltage generator, a second voltage generator, a first switcher, a second switcher, a first booster, and a second booster. The first booster boosts a voltage lower than a first switching drive voltage to thereby generate the first switching drive voltage, and supplies the first switching drive voltage to the first switcher on a first supply path. The second booster boosts a voltage lower than a second switching drive voltage to thereby generate the second switching drive voltage, and supplies the second switching drive voltage to the second switcher on a second supply path.