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    Electric working machine and method for smoothing AC power supplied thereto
    13.
    发明授权
    Electric working machine and method for smoothing AC power supplied thereto 有权

    公开(公告)号：US10658951B2

    公开(公告)日：2020-05-19

    申请号：US15657484

    申请日：2017-07-24

    Applicant: MAKITA CORPORATION

    Inventor： Yuki Kawai ,  Itsuku Kato

    IPC: H02P1/02 ,  H02P29/024 ,  H02H9/00 ,  H02P6/20 ,  H02M1/36 ,  H02M7/06 ,  H03K5/1536 ,  H03K17/567 ,  H02M1/42

    Abstract: An electric working machine according to one aspect of the present disclosure comprises a motor, a rectifier circuit, a capacitor, a series switching element, a resistive element, a drive circuit, a peak voltage value acquirer, and a controller. The capacitor smooths power rectified by the rectifier circuit. The series switching element is coupled in series with the capacitor. The resistive element is coupled in parallel with the series switching element. The controller brings the series switching element into conduction in a case where AC power is inputted to the rectifier circuit and where a specified conducting condition based on a peak voltage value acquired by the peak voltage value acquirer is satisfied.

    Driving tool
    14.
    发明授权
    Driving tool 有权

    公开(公告)号：US09943952B2

    公开(公告)日：2018-04-17

    申请号：US14565993

    申请日：2014-12-10

    Applicant: MAKITA CORPORATION

    Inventor： Itsuku Kato

    IPC: B25C1/04 ,  F15B15/14 ,  F15B9/09 ,  B25C1/06

    CPC classification number: B25C1/047 ,  B25C1/06 ,  F15B9/09 ,  F15B15/149 ,  F15B2211/8855

    Abstract: An electro-pneumatic tool drives a fastener into a workpiece by energizing an electric motor to drive a first piston and generate compressed air in a first cylinder. The compressed air is then supplied to a second cylinder and causes a second piston to move and drive the fastener into the workpiece. After the first piston has passed through its top dead center, braking is applied to the first piston according to one or more braking parameters. Then, if a control unit determines that the first piston has come to a stop at a position that is outside a predetermined range about the bottom dead center of the first piston, one or more of the braking parameters is changed in a subsequent fastener driving cycle to cause the first piston to stop closer to its bottom dead center after conclusion of the subsequent fastener driving cycle.

    Motor-driven appliance
    15.
    发明授权
    Motor-driven appliance 有权
    电机驱动

    公开(公告)号：US09543871B2

    公开(公告)日：2017-01-10

    申请号：US14449456

    申请日：2014-08-01

    Applicant: MAKITA CORPORATION

    Inventor： Itsuku Kato

    IPC: G05B5/00 ,  H02H7/08 ,  H02P1/00 ,  H02P7/06 ,  G05B6/02 ,  H02P27/08 ,  H02P7/29 ,  B23D51/16 ,  H02P31/00

    CPC classification number: H02P7/06 ,  B23D51/16 ,  G05B6/02 ,  H02P7/2913 ,  H02P27/08 ,  H02P31/00 ,  Y02P70/187

    Abstract: A motor-driven appliance of one aspect of the present disclosure includes a motor and a controller. The controller includes a physical quantity detector, a variation deriving portion, a loaded condition detector, and driving output portion. The physical quantity detector detects a physical quantity related to an operating state of the motor. The variation deriving portion derives a variation in the physical quantity based upon the physical quantity detected by the physical quantity detector. The loaded condition detector detects that the motor is under a loaded condition in which the motor is applied with a load based upon the variation derived by the variation deriving portion. The driving output portion generates the driving output corresponding to whether the loaded condition is detected by the loaded condition detector.

    Abstract translation: 本公开的一个方面的电动机具包括马达和控制器。 控制器包括物理量检测器，变化导出部分，加载状态检测器和驱动输出部分。 物理量检测器检测与电动机的运行状态相关的物理量。 变化导出部分基于物理量检测器检测到的物理量导出物理量的变化。 负载状态检测器基于由变化导出部分导出的变化器检测到电动机处于其中电动机施加负载的负载状态。 驱动输出部分产生与装载条件检测器检测到的装载条件相对应的驱动输出。

    POWER TOOL HAVING A BRUSHLESS MOTOR AND A CONTROL UNIT FOR CONTROLLING THE BRUSHLESS MOTOR
    16.
    发明申请
    POWER TOOL HAVING A BRUSHLESS MOTOR AND A CONTROL UNIT FOR CONTROLLING THE BRUSHLESS MOTOR 有权
    具有无刷马达的电动工具和用于控制无刷马达的控制单元

    公开(公告)号：US20140210379A1

    公开(公告)日：2014-07-31

    申请号：US14165711

    申请日：2014-01-28

    Applicant: MAKITA CORPORATION

    Inventor： Itsuku Kato ,  Motohiro OMURA

    IPC: H02P6/08

    CPC classification number: H02P6/08 ,  H02P6/15 ,  H02P6/153

    Abstract: A power tool according to one aspect of one embodiment described in the disclosure includes a brushless motor, a battery voltage detection unit configured to detect a voltage of a battery that provides energy for driving the brushless motor, a rotational position detection unit configured to detect a rotational position of the brushless motor, and a control unit configured to control a drive output supplied to the brushless motor based at least in part on a signal from the rotational position detection unit. The control unit controls a current conduction angle and/or an advance angle supplied to the brushless motor so that, during control of the drive output to the brushless motor, a rotational speed or a conducting current of the brushless motor approaches or reaches a target value, the target value being based at least in part on a battery voltage detected by the battery voltage detection unit.

    Abstract translation: 根据本公开所述的一个实施方式的电动工具，具有：无刷电动机，电池电压检测部，被配置为检测提供用于驱动无刷电动机的能量的电池的电压;旋转位置检测部， 无刷电动机的旋转位置，以及控制单元，被配置为至少部分地基于来自旋转位置检测单元的信号来控制提供给无刷电动机的驱动输出。 控制单元控制提供给无刷电动机的电流导通角和/或提前角，使得在对无刷电动机的驱动输出的控制期间，无刷电动机的转速或导通电流接近或达到目标值 目标值至少部分地基于由电池电压检测单元检测到的电池电压。

    Electric work machine
    17.
    发明授权
    Electric work machine 有权

    公开(公告)号：US12233517B2

    公开(公告)日：2025-02-25

    申请号：US17982649

    申请日：2022-11-08

    Applicant: MAKITA CORPORATION

    Inventor： Itsuku Kato

    IPC: B25B23/147

    Abstract: The electric work machine in one aspect of the present disclosure includes an output shaft, a motor, a current measuring circuit, and a controller. The current measuring circuit measures a current value, the current value corresponding to a magnitude of a drive current flowing through the motor. The controller sets a maximum value and a threshold. The controller calculates the correction value less than or equal to the maximum value so that the drive current decreases, in response to the current value having reached the threshold. The controller subtracts, from the control parameter, the correction value calculated, thereby correcting the control parameter. The controller drives the motor based on the control parameter corrected.

    Electric work machine
    18.
    发明授权
    Electric work machine 有权

    公开(公告)号：US12011813B2

    公开(公告)日：2024-06-18

    申请号：US17014012

    申请日：2020-09-08

    Applicant: MAKITA CORPORATION

    Inventor： Hitoshi Suzuki ,  Seitaro Hayashi ,  Motohiro Omura ,  Itsuku Kato

    IPC: H02H7/097 ,  B25F5/00 ,  H02P6/12 ,  H02P6/16 ,  H02P6/22 ,  H02P6/24 ,  H02P29/028

    CPC classification number: B25F5/001 ,  H02H7/097 ,  H02P29/028 ,  H02P6/12 ,  H02P6/16 ,  H02P6/22 ,  H02P6/24

    Abstract: An electric work machine (1; 110; 120; 130), such as a power tool, includes a motor (11) having a rotor, a drive part (13) that supplies electric currents to drive the motor, a rotational-direction selection part (17), and a motor-control part (14; 31, 32, 40, 50, 60; 14, 40, 60, 73, 80; 14, 60, 91). The rotational-direction selection part is configured for manually setting (selecting) the rotational direction of the rotor and outputs first and second setting signals that each indicate the set (selected) rotational direction. The motor-control part controls the drive part such that the rotor rotates in the rotational direction indicated by the first setting signal and/or the second setting signal. In response to a determination that the rotational directions indicated by the first and second setting signals are inconsistent, the motor-control part stops or prevents the drive of the motor.

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