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公开(公告)号：US20220193867A1
公开(公告)日：2022-06-23
申请号：US17604894
申请日：2020-01-30
Inventor： Kenji HANAMURA , Masayuki NAKAHARA , Fumiiki YONEDA
IPC: B25B21/02 , B25B23/147
Abstract: An electric power tool includes an electric motor (AC motor), an impact mechanism, an impact detecting unit, and a measuring unit. The impact mechanism performs an impact operation that generates impacting force by receiving motive power from the electric motor. The impact detecting unit determines whether or not the impact operation is being performed. The measuring unit measures at least one of a d-axis current or a q-axis current, each of which is supplied to the electric motor. The impact detecting unit determines, based on at least one of a measured value (current measured value) of the d-axis current or a measured value (current measured value) of the q-axis current, whether or not the impact operation is being performed. The measured values (current measured values) of the d-axis current and the q-axis current have been obtained by the measuring unit.
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公开(公告)号：US20200287482A1
公开(公告)日：2020-09-10
申请号：US16648905
申请日：2019-01-11
Inventor： Fumiiki YONEDA , Koichiro ESAKA
IPC: H02P3/18 , H02P27/08 , H02P25/022
Abstract: A control circuit for an electric tool according to the present invention, includes a permanent magnet synchronous motor, a plurality of switching elements, and a PWM inverter circuit that drives the permanent magnet synchronous motor. The control circuit includes a current detector that detects a current flowing through the PWM inverter circuit. When braking the permanent magnet synchronous motor, the control circuit limits a current flowing through the permanent magnet synchronous motor and the PWM inverter circuit, to a predetermined current limit value. At the same time, by switching low-side switching elements or high-side switching elements of the PWM inverter circuit, the control circuit boosts an induced electromotive voltage of the permanent magnet synchronous motor, and regenerates a regenerative current to the battery.
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Patent Agency Ranking
公开(公告)号：US20220247338A1
公开(公告)日：2022-08-04
申请号：US17603748
申请日：2020-01-30
Inventor： Fumiiki YONEDA , Kenji HANAMURA , Masayuki NAKAHARA
IPC: H02P21/22
Abstract: An electric tool includes an electric motor (AC motor), an impact mechanism, and a control unit. The control unit includes an impact detecting unit. The control unit performs feedback control on an operation of the electric motor. In a following period after the impact detecting unit has detected that the impact mechanism has started an impact operation, the control unit changes target parameters in a preceding period before the impact detecting unit detects that the impact mechanism has started the impact operation into different target parameters. The target parameters include a control gain of the feedback control.
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公开(公告)号：US20210083616A1
公开(公告)日：2021-03-18
申请号：US16620325
申请日：2018-04-17
Inventor： Fumiiki YONEDA
IPC: H02P29/024 , H02P6/06 , H02P6/28
Abstract: A controller apparatus for an electric power tool is provided where the electric power tool includes a battery and a DC brushless motor. The controller apparatus includes a current detector that detects an instantaneous current flowing in the DC brushless motor; a current calculator that calculates one of an average value and an effective value of the instantaneous current detected by the current detector; a current controller configured to utilize a result from the current calculator as a detected value; and a speed controller configured to generate a target value of the current controller. The controller apparatus further includes a limiter that limits the target value of the current controller, where the limiter is provided at an output stage of the speed controller.
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公开(公告)号：US20220216746A1
公开(公告)日：2022-07-07
申请号：US17604407
申请日：2020-01-30
Inventor： Fumiiki YONEDA , Kenji HANAMURA , Masayuki NAKAHARA
Abstract: An electric tool includes an AC motor (an electric motor) and a control unit. The AC motor includes a permanent magnet and a coil. The control unit is configured to perform control on operation of the AC motor. The control performed by the control unit includes field weakening control. In the field weakening control, the control unit causes a flux-weakening current to flow through the coil. The flux-weakening current is a current that generates, in the coil, a magnetic flux that weakens a magnetic flux of the permanent magnet.
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公开(公告)号：US20220140694A1
公开(公告)日：2022-05-05
申请号：US17260667
申请日：2019-06-14
Inventor： Fumiiki YONEDA
Abstract: An electric tool includes a motor and a motor control device. The motor control device is configured to update a command value of a speed of the motor based on a parameter relating to at least one of a voltage of a direct-current power supply for the motor or a magnitude of a load applied to the motor during rotation of the motor.
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公开(公告)号：US20210078145A1
公开(公告)日：2021-03-18
申请号：US16618841
申请日：2018-04-17
Inventor： Fumiiki YONEDA
IPC: B25B23/147 , H02P29/40
Abstract: An electric power tool is provided with a permanent magnet synchronous motor, and a controller. The controller is configured to control an operation of the permanent magnet synchronous motor. The controller includes a limiter that limits a current contributing to torque generation by the permanent magnet synchronous motor to a predetermined maximum set value based on a predetermined tightening torque. The controller calculates the maximum set value of the current that contributes to the torque generation by changing one of a rotation speed and an angular speed of the permanent magnet synchronous motor.
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