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公开(公告)号：US20220115966A1
公开(公告)日：2022-04-14
申请号：US17560520
申请日：2021-12-23
Applicant: Nanjing Chervon Industry Co., Ltd.
Inventor： Zhen Xu , Junya Duan , Jifeng Feng
Abstract: A power tool includes a housing, a brushless motor disposed inside the housing, and a controller. The controller is configured to receive power-off signals and power-on signals. Upon receiving a power-on signal, the controller is further configured to receive a time signal indicative of a time interval from the last power-off signal to the current power-on signal. The controller is further configured to determine whether the time interval is greater than or equal to a first time threshold and less than a second time threshold, and brake the motor before start-up if the time interval is greater than or equal to the first time threshold and less than the second time threshold.
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Patent Agency Ranking
公开(公告)号：US12040688B2
公开(公告)日：2024-07-16
申请号：US17751251
申请日：2022-05-23
Applicant: Nanjing Chervon Industry Co., Ltd.
Inventor： Zhen Xu , Dezhong Yang , Yanqing Xu
CPC classification number: H02K7/145 , B25F5/02 , H02K11/33 , H02P27/085
Abstract: A power tool includes a functional element, a motor, a power supply module, a driver circuit, and a control module. The control module is electrically connected to the driver circuit and configured to output a control signal to the driver circuit to control the driver circuit. The control module is configured to: in the case where the power tool is in a first operation stage, control the driver circuit in a first control mode so that a voltage of the motor varies with a rotor position of the motor in a square wave; and in the case where the power tool is in a second operation stage, control the driver circuit in a second control mode so that the voltage of the motor varies with the rotor position of the motor in a sine wave or a saddle wave.
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公开(公告)号：US20240116208A1
公开(公告)日：2024-04-11
申请号：US18451678
申请日：2023-08-17
Applicant: Nanjing Chervon Industry Co., Ltd.
Inventor： Zhen Xu , Kai Hu , Huaishu Wang , Junya Duan , Huaguo Zhu , Minggui Xiao
CPC classification number: B27G19/003 , B27B17/083
Abstract: A chainsaw includes a chain, a liquid pump assembly, a motor, and a controller. The chain is used for implementing a cutting operation. The liquid pump assembly includes a liquid pump and a motor. The liquid pump is used for releasing a liquid for lubricating or cooling the chain. The motor is used for at least driving the liquid pump to operate. The controller is electrically connected to at least the motor. The controller is configured to, when the liquid pump is in the jammed state, control the liquid pump assembly to enter a throttling mode in which a supplied amount of the liquid is reduced, and when the liquid pump exits the jammed state, control the liquid pump assembly to exit the throttling mode. Technical solutions provided by the present application can determine and release the jammed state of the chainsaw.
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公开(公告)号：US11791750B2
公开(公告)日：2023-10-17
申请号：US17560520
申请日：2021-12-23
Applicant: Nanjing Chervon Industry Co., Ltd.
Inventor： Zhen Xu , Junya Duan , Jifeng Feng
Abstract: A power tool includes a housing, a brushless motor disposed inside the housing, and a controller. The controller is configured to receive power-off signals and power-on signals. Upon receiving a power-on signal, the controller is further configured to receive a time signal indicative of a time interval from the last power-off signal to the current power-on signal. The controller is further configured to determine whether the time interval is greater than or equal to a first time threshold and less than a second time threshold, and brake the motor before start-up if the time interval is greater than or equal to the first time threshold and less than the second time threshold.
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公开(公告)号：US20220286018A1
公开(公告)日：2022-09-08
申请号：US17751251
申请日：2022-05-23
Applicant: Nanjing Chervon Industry Co., Ltd.
Inventor： Zhen Xu , Dezhong Yang , Yanqing Xu
Abstract: A power tool includes a functional element, a motor, a power supply module, a driver circuit, and a control module. The control module is electrically connected to the driver circuit and configured to output a control signal to the driver circuit to control the driver circuit. The control module is configured to: in the case where the power tool is in a first operation stage, control the driver circuit in a first control mode so that a voltage of the motor varies with a rotor position of the motor in a square wave; and in the case where the power tool is in a second operation stage, control the driver circuit in a second control mode so that the voltage of the motor varies with the rotor position of the motor in a sine wave or a saddle wave.
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公开(公告)号：US20240066663A1
公开(公告)日：2024-02-29
申请号：US18347797
申请日：2023-07-06
Applicant: Nanjing Chervon Industry Co., Ltd.
Inventor： Zhen Xu
CPC classification number: B24B49/10 , B24B7/184 , B24B47/12 , H02P27/085
Abstract: A power tool includes an electric motor including multi-phase windings; and a control circuit for controlling the electric motor to rotate. The control circuit includes a driver circuit including multiple switching elements having multiple driving states to drive the electric motor to rotate; a parameter detection module for detecting an electrical parameter of the control circuit; and a controller for outputting a pulse-width modulation (PWM) control signal to control the driver circuit to change the multiple driving states. The controller is configured to change the absolute value of the variation of a duty cycle of the PWM control signal according to the electrical parameter to control a steady-state error of the electric motor running in a constant speed to be within a preset range.
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