Nanjing Chervon Industry Patente

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Provided is a power tool. The power tool includes an electric motor including multiphase 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.

Provided are a self-propelled mower and a boundary establishment method therefor. The self-propelled mower includes at least: a body; a traveling wheel assembly configured to support the body; a signal receiving unit configured to receive a signal sent by a first remote device to obtain external positioning data of the self-propelled mower; a first sensor assembly configured to detect environmental information around the self-propelled mower; a second sensor assembly configured to detect a motion state of the self-propelled mower; and a fusion positioning unit. The fusion positioning unit is configured to: position the self-propelled mower according to the environmental information and fuse the external positioning data to generate a first positioning result; position the self-propelled mower according to the motion state and fuse the external positioning data to generate a second positioning result; and fuse the first positioning result and the second positioning result to generate a final positioning result.

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A multi-function power tool includes a housing (100) and a power mechanism (200). The housing (100) includes a front portion (110) and a grip (120). The power mechanism (200) includes an output assembly (210) and an electric motor (220). The output assembly (210) includes a first output shaft (211) and a second output shaft (212). The first output shaft (211) is configured to be mounted with and drive a first attachment (400), and the second output shaft (212) is configured to be mounted with and drive a second attachment (500). The electric motor (220) includes a motor shaft (221) that drives the first output shaft (211) and the second output shaft (212). At least one of the first output shaft (211) and the second output shaft (212) is substantially parallel to the motor shaft (221).

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Provided is a power tool system. The power tool system includes: a power tool (10); a battery pack (300) coupled to the power tool (10) to supply electric power to the power tool (10), where at least one of the power tool (10) and the battery pack (300) is provided with a force-bearing component (70a); and at least one miniature force sensor (600) mounted in the power tool (10) or the battery pack (300), where the miniature force sensor (600) detects at least one of a deformation parameter of a preset part of the force-bearing component (70a) or a value of a force applied to the preset part of the force-bearing component (70a), and the operating current of the miniature force sensor (600) is less than or equal to 10 mA.

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A snow thrower includes a body including a working assembly; a handle used for a user to hold and connected to the body; a power supply device for providing the snow thrower with electrical energy; an electric motor for driving the snow thrower to move; a detection module for determining whether the snow thrower is slipping and idling; and a control module connected to at least the detection module and the electric motor. When the detection module determines that the snow thrower is slipping and idling, the control module controls the snow thrower to stop slipping and idling.

Provided are a manned mower and an outdoor traveling device. The manned mower includes: a frame; a traveling wheel set mounted to the frame, where the traveling wheel set includes at least rear traveling wheels that include a first traveling wheel and a second traveling wheel; a traveling motor having a drive shaft and configured to drive the traveling wheel set; a mowing element driven by a mowing motor; and a power supply assembly, where the power supply assembly includes at least one battery pack and is configured to power the traveling motor and/or the mowing motor. A ratio of a distance L1 between the first traveling wheel and the second traveling wheel to a radius R of the first traveling wheel is greater than or equal to 6.

A working system of an autonomous mobile device includes the autonomous mobile device, a first base station, and a second base station, where the autonomous mobile device includes a controller and at least one radio, and the controller is configured to, within a current cycle, configure the radio to receive a first signal from the first base station and acquire a first common-view satellite parameter and a first communication parameter with the first base station based on the first signal; after the end of the current cycle, configure the radio to receive a second signal from the second base station and acquire a second common-view satellite parameter and a second communication parameter with the second base station based on the second signal; evaluate a signal quality of the first base station and a signal quality of the second base station based on the first and second common-view satellite parameters and the first and second communication parameters, and in the case where the signal quality of the second base station is better than the signal quality of the first base station, configure, within the next cycle, the radio to receive the second signal from the second base station.

A fastener driver includes: a trigger assembly operated by a user to switch between a first state in which a striker is allowed to strike a fastener and a second state in which the striker is forbidden to strike the fastener; a lifting assembly, where at least part of the lifting assembly is movably disposed in a magazine to drive the fastener to move in the magazine; and a dry fire prevention assembly having a dry fire prevention state, where the dry fire prevention assembly includes a stopper, and in the dry fire prevention state, the trigger assembly is forbidden by the stopper to switch to the first state. When the trigger assembly obstructs the stopper from performing a first motion, the lifting assembly drives the stopper to perform a second motion.

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