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公开(公告)号：US20230061013A1
公开(公告)日：2023-03-02
申请号：US17894281
申请日：2022-08-24
申请人： MAKITA CORPORATION
发明人： Itsuku KATO
摘要： An electric work machine includes a motor, a first connector, a second connector, an energizing circuit, a manual switch, and a controller. The controller electrically disconnects the first connector from the motor based on a first voltage value below a first threshold at a start of motor rotation. The controller maintains an electrical connection of the first connector to the motor based on the first voltage value below the first threshold and equal to or greater than a second threshold during discharge of the first battery.
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公开(公告)号：US20170302211A1
公开(公告)日：2017-10-19
申请号：US15484479
申请日：2017-04-11
申请人： MAKITA CORPORATION
发明人： Akihiro NAKAMOTO , Itsuku KATO , Yuki KAWAI
摘要： An electric working machine of an example of the present disclosure includes: a motor; a power supply portion; a controller; and a voltage detector. The power supply portion generates a DC voltage to drive the motor by rectifying an AC voltage supplied from an AC power source and smoothing by a capacitor. The controller controls energization of the motor. The voltage detector detects the AC voltage. The controller is configured to interrupt the energization when the voltage detector does not detect the AC voltage.
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公开(公告)号：US20240091914A1
公开(公告)日：2024-03-21
申请号：US18240412
申请日：2023-08-31
申请人： MAKITA CORPORATION
发明人： Shu ISAKA , Itsuku KATO
摘要： An electric power tool in one aspect of the present disclosure includes a motor, an output shaft, a drive circuit, a rotation controller, a calculator, and a deceleration controller. The output shaft is configured to attach a tool bit thereto, and be rotated by the motor. The rotation controller rotates the output shaft to thereby loosen a fastener from a fastened material. The calculator increases a determination value in accordance with a lapse of time from a first timing, and varies a rate of increase in the determination value in accordance with a speed parameter. The deceleration controller decelerates or stops the motor based on the determination value having reached a threshold value.
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公开(公告)号：US20210094163A1
公开(公告)日：2021-04-01
申请号：US17026932
申请日：2020-09-21
申请人： MAKITA CORPORATION
发明人： Itsuku KATO
IPC分类号： B25D16/00 , B25B19/00 , B25B23/147 , H02P6/06
摘要： An electric power tool in one aspect of the present disclosure includes a motor, an impact mechanism, an impact detector, and a control circuit. The control circuit controls a motor current based on a drive duty ratio in a first driving term. The first driving term corresponds to a time period from when the motor is started until impact is detect. The drive duty ratio corresponds to a sum of a basic duty ratio and a proportional duty ratio. The control circuit controls the motor current so that an actual rotational speed of the motor is consistent with a target rotational speed after elapse of the first driving term.
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公开(公告)号：US20190023265A1
公开(公告)日：2019-01-24
申请号：US16024272
申请日：2018-06-29
申请人： MAKITA CORPORATION
发明人： Kouichi TAKEDA , Itsuku KATO , Jiro SUZUKI
CPC分类号： B60W30/09 , B60L15/2009 , B60L2200/30 , B60L2240/12 , B60L2240/421 , B60W10/08 , B60W10/18 , B60W50/14 , B60W2300/40 , B60W2550/10 , B60W2710/08 , B60W2710/18 , B62B3/12 , B62B5/0033
摘要： A push cart includes a wheel, a motor, an obstacle detector, and a controller. The motor is configured to generate a rotational force that rotates the wheel. The obstacle detector is configured to detect an obstacle. The controller is configured to execute, in response to detection of the obstacle by the obstacle detector, avoidance control to control driving of the motor such that a movement of the push cart is limited. The controller is configured to disable execution of the avoidance control in response to a determination that a specified disabling condition is satisfied.
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公开(公告)号：US20240123594A1
公开(公告)日：2024-04-18
申请号：US18379900
申请日：2023-10-13
申请人： MAKITA CORPORATION
发明人： Yuki HAYASHI , Itsuku KATO
摘要： One aspect of the present disclosure provides an electric power tool including a motor, a drive circuit, a voltage detector, a first calculator, and a second calculator. The drive circuit applies a power-supply voltage to the motor in accordance with a first duty ratio. The voltage detector detects a magnitude of the power-supply voltage. The first calculator calculates a desired duty ratio based on the magnitude of the power-supply voltage detected. The second calculator increases the first duty ratio from an initial value to the desired duty ratio in accordance with a lapse of time. The second calculator varies a rate of increase of the first duty ratio based on the magnitude of the power-supply voltage detected.
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公开(公告)号：US20230069547A1
公开(公告)日：2023-03-02
申请号：US17893524
申请日：2022-08-23
申请人： MAKITA CORPORATION
发明人： Itsuku KATO
摘要： An electric work machine according to one aspect of the present disclosure includes a motor, a first connector, a second connector, an energizing circuit, a manual switch, and a controller. The controller outputs a first control signal to the energizing circuit to electrically connect the first connector to the motor, increases an actual rotational speed of the motor at a first rate, outputs the first control signal to the energizing circuit to electrically connect the second connector to the motor, and increases the actual rotational speed at a second rate. The second rate is less than the first rate.
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公开(公告)号：US20150042254A1
公开(公告)日：2015-02-12
申请号：US14449456
申请日：2014-08-01
申请人： MAKITA CORPORATION
发明人： Itsuku KATO
CPC分类号： H02P7/06 , B23D51/16 , G05B6/02 , H02P7/2913 , H02P27/08 , H02P31/00 , Y02P70/187
摘要： 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.
摘要翻译： 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马达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。
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公开(公告)号：US20230336105A1
公开(公告)日：2023-10-19
申请号：US18134309
申请日：2023-04-13
申请人： MAKITA CORPORATION
发明人： Dai SUZUKI , Masayuki OKAMURA , Itsuku KATO
IPC分类号： H02P29/032 , B25F5/00 , H02P6/24
CPC分类号： H02P29/032 , B25F5/00 , H02P6/24
摘要： An electric working machine in one aspect of the present disclosure calculates an estimated heat value based on an electric current value and a parameter. The estimated heat value corresponds to an estimated heat generation amount of a motor. The electric current value corresponds to a magnitude of an electric current delivered from a power source to the motor. The electric work machine varies the parameter based on a load time. The load time corresponds to a time period during which a first load is continuously imposed on the motor. The first load has a specified magnitude or more. The electric work machine performs a protective operation for over temperature protection of the motor based on the estimated heat value having reached a heat threshold.
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公开(公告)号：US20220371112A1
公开(公告)日：2022-11-24
申请号：US17751091
申请日：2022-05-23
申请人： MAKITA CORPORATION
发明人： Masayuki OKAMURA , Takuya KUSAKAWA , Itsuku KATO
IPC分类号： B23D49/00
摘要： An electric work machine in one aspect of the present disclosure includes a motor, a manual switch, and a control circuit. The control circuit switches a preset control either to be enabled or disabled. During the preset control being enabled, the control circuit (i) varies an actual rotational speed of the motor in accordance with an actual moved distance of the manual switch and (ii) increases the actual rotational speed in response to a load being imposed on the motor. During the preset control being disabled, the control circuit varies the actual rotational speed in accordance with the actual moved distance of the manual switch in a manner at least partly distinctive from a variation in the actual rotational speed during the preset control being enabled.
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