Abstract: A power tool includes a housing, an electric motor, a power supply device, a driver circuit, a controller, a first capacitor, and a voltage collection device. The power supply device is used for outputting a power signal to the driver circuit; and the driver circuit is used for outputting a drive signal to the electric motor according to the power signal and a control signal provided by the controller. The first capacitor is connected in parallel between the power supply device and the driver circuit. The voltage collection device is used for collecting a bus voltage signal at the front end of the driver circuit and transmitting the bus voltage signal to the controller. The controller can control the duty cycle of the control signal to decrease when the amplitude of the bus voltage is greater than a preset amplitude.

Abstract: A power tool includes a housing, an electric motor, a power supply device, a driver circuit, a controller, a first capacitor, and a voltage collection device. The power supply device is used for outputting a power signal to the driver circuit; and the driver circuit is used for outputting a drive signal to the electric motor according to the power signal and a control signal provided by the controller. The first capacitor is connected in parallel between the power supply device and the driver circuit. The voltage collection device is used for collecting a bus voltage signal at the front end of the driver circuit and transmitting the bus voltage signal to the controller. The controller can control the duty cycle of the control signal to decrease when the amplitude of the bus voltage is greater than a preset amplitude.

Abstract: A self-propelled device includes a cutting assembly for cutting vegetation; a body for supporting the cutting assembly; and a traveling system for driving the body to move. The traveling system includes at least a traveling wheel; and a wheel hub motor integrally disposed in the traveling wheel. Along an axial direction of the traveling wheel, the first external dimension of the self-propelled device is greater than or equal to 0.2 m and less than or equal to 1.5 m. Along a direction perpendicular to the axial direction of the traveling wheel, the second external dimension of the self-propelled device is greater than or equal to 0.5 m and less than or equal to 1.5 m.

Abstract: The present application relates to an anti-slide sheath of a grip and methods for using and fabricating the same. The anti-slide sheath of a grip includes a sheath body for attaching a grip, and a connection portion is provided on the sheath body; the sheath body includes a contact surface located outside the sheath body and a connection surface contacting a surface of the grip; the contact surface and the connection surface are both supported by flexible materials.