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公开(公告)号：US20170093321A1
公开(公告)日：2017-03-30
申请号：US15266635
申请日：2016-09-15
Applicant: MAKITA CORPORATION
Inventor： Yoshitaka ICHIKAWA
CPC classification number: H02P27/08 , H02P6/085 , H02P6/14 , H02P27/085
Abstract: An electric power tool in one aspect of the disclosure comprises an operation unit, a bridge circuit having a plurality of switching elements, and a control unit. The control unit is configured to select from the plurality of switching elements a pair of switching elements forming a current path of a motor. The control unit selectively executes one of non-complementary PWM in which one of the selected switching elements is turned on and the other turned on/off, and complementary PWM in which, in addition to the same control as that of the non-complementary PWM, a switching element connected to the same terminal of the motor as the other of the selected switching elements is turned on/off so that an on/off state of the switching element is reversed to that of the other of the selected switching elements.
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公开(公告)号：US20140096986A1
公开(公告)日：2014-04-10
申请号：US14045105
申请日：2013-10-03
Applicant: MAKITA CORPORATION
Inventor： Shinji HIRABAYASHI , Kenya YANAGIHARA , Yoshitaka ICHIKAWA
Abstract: A chain saw as a power tool includes a combustion engine and an electric motor. The chain saw has a driving shaft which drives a saw chain, a battery pack which provides electric current to the electric motor, a controller which is connected to the battery pack, and a sensor which detects a driving state of a driving mechanism including the combustion engine and the electric motor. In the chain saw, the saw chain is driven in a hybrid driving mode in which both the combustion engine and the electric motor drive the driving shaft. Further, the controller controls a driving of the combustion engine based on a detection result of the sensor.
Abstract translation: 作为动力工具的链锯包括内燃机和电动马达。 链锯具有驱动锯链的驱动轴，向电动机提供电流的电池组，连接到电池组的控制器和检测包括燃烧的驱动机构的驱动状态的传感器 发动机和电动机。 在链锯中，锯链以混合驱动模式驱动，其中内燃机和电动机都驱动驱动轴。 此外，控制器基于传感器的检测结果控制内燃机的驱动。
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公开(公告)号：US20210091686A1
公开(公告)日：2021-03-25
申请号：US17015158
申请日：2020-09-09
Applicant: MAKITA CORPORATION
Inventor： Yoshitaka ICHIKAWA
Abstract: An electric working machine in one aspect of the present disclosure includes a motor and a controller. The motor is configured to be electrically coupled to a battery pack and to be driven with electric power from the battery pack. The controller is configured to acquire an internal resistance information of the battery pack and to change control of the motor based on the internal resistance information acquired.
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公开(公告)号：US20200260644A1
公开(公告)日：2020-08-20
申请号：US16787140
申请日：2020-02-11
Applicant: MAKITA CORPORATION
Inventor： Yoshitaka ICHIKAWA
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：US20200212837A1
公开(公告)日：2020-07-02
申请号：US16715560
申请日：2019-12-16
Applicant: MAKITA CORPORATION
Inventor： Yoshitaka ICHIKAWA , Akihiro NAKAMOTO
IPC: H02P29/024 , H02P27/06 , A01G3/053 , A01G3/06
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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Patent Agency Ranking
16.发明申请公开(公告)号：US20180099394A1
公开(公告)日：2018-04-12
申请号：US15724766
申请日：2017-10-04
Applicant: MAKITA CORPORATION
Inventor： Yoshitaka ICHIKAWA , Hirokatsu YAMAMOTO , Ryo UMEMOTO , Kunihisa SHIMA
CPC classification number: B25D16/006 , B25D17/043 , B25D17/24 , B25D2211/068 , B25D2216/0015 , B25D2216/0023 , B25D2216/0038 , B25D2216/0084 , B25D2222/72 , B25D2250/121 , B25D2250/201 , B25D2250/221 , B25D2250/265
Abstract: An electric power tool according to one aspect of the present disclosure includes a main body, a motor, a tool holder configured to hold a tool bit, a hammer, a motion converter, a rotation transmitter, a first load detector, a second load detector, and a motor controller. The first load detector detects, based on information indicating a drive state of the motor, a load imposed from a work piece to the tool bit. The second load detector detects, based on information indicating a behavior of the main body, a load imposed from the work piece to the tool bit. The motor controller sets an upper limit of rotational speed of the motor to a predetermined no-load rotational speed in response to no-load on the tool bit being detected by both the first load detector and the second load detector.
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公开(公告)号：US20170093315A1
公开(公告)日：2017-03-30
申请号：US15278523
申请日：2016-09-28
Applicant: MAKITA CORPORATION
Inventor： Yoshitaka ICHIKAWA
IPC: H02P6/24 , H02K11/215 , H02P23/20 , B25F5/00 , H02P27/08
CPC classification number: H02P6/24 , B25F5/00 , H02K11/215 , H02P23/20 , H02P27/08 , H02P29/0241
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：US20140096987A1
公开(公告)日：2014-04-10
申请号：US14045312
申请日：2013-10-03
Applicant: MAKITA CORPORATION
Inventor： Shinji HIRABAYASHI , Yoshitaka ICHIKAWA
IPC: B23Q5/04
Abstract: A chain saw as a power tool includes a combustion engine and an electric motor. The chain saw has a driving shaft which drives a saw chain, a battery pack which provides electric current to the electric motor, and a controller which is connected to the battery pack. In the chain saw, both the combustion engine and the electric motor drive the driving shaft so that the driving shaft drives the saw chain. Further, the controller controls a driving of the electric motor based on a remaining capacity of the battery pack.
Abstract translation: 作为动力工具的链锯包括内燃机和电动马达。 链锯具有驱动锯链的驱动轴，向电动机提供电流的电池组以及连接到电池组的控制器。 在链锯中，内燃机和电动机均驱动驱动轴，使得驱动轴驱动锯链。 此外，控制器基于电池组的剩余容量来控制电动机的驱动。
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19.发明申请公开(公告)号：US20130307446A1
公开(公告)日：2013-11-21
申请号：US13895890
申请日：2013-05-16
Applicant: MAKITA CORPORATION
Inventor： Yoshitaka ICHIKAWA
IPC: H02P3/06
Abstract: A braking apparatus for a three-phase brushless motor is provided in a motor-driven appliance, and includes a switching circuit having six switching elements and a brake control device. The brake control device executes two-phase short-circuit control in braking control in which a braking force is generated in the motor. In the two-phase short-circuit control, an on/off state of each of the switching elements is set in such a manner that two out of three conduction paths constituting one of a positive electrode side conduction path that connects three terminals of the motor and a positive electrode side of a direct current power source and a negative electrode side conduction path that connects the three terminals and a negative electrode side of the power source are in a conducting state and other of the three conduction paths is in a non-conducting state.
Abstract translation: 一种用于三相无刷电动机的制动装置设置在电动机具中，并且包括具有六个开关元件和制动控制装置的开关电路。 制动控制装置在电动机中产生制动力的制动控制中进行两相短路控制。 在两相短路控制中，每个开关元件的导通/截止状态被设置成使三个导通路径中的两个构成连接电动机的三个端子的正极侧传导路径之一 直流电源的正极侧和连接电源的三个端子和负极侧的负极侧导电路径处于导通状态，三个导通路径中的另一个处于不导通状态 州。
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公开(公告)号：US20220115892A1
公开(公告)日：2022-04-14
申请号：US17274396
申请日：2019-09-11
Applicant: MAKITA CORPORATION
Inventor： Yoshitaka ICHIKAWA , Tadahiko KOBAYAKAWA
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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