Abstract: A rotational speed controlling module includes an input unit, a first receiving unit, a second receiving unit, and a controlling unit. The input unit is to input a first target rotational speed value, a second target rotational speed value and a target number of turns. The first receiving unit is to receive a real-time rotational speed value from an electric screw driver with clutch. The second receiving unit is to receive a real-time number of turns. The controlling unit is to control real-time rotational speed value to decrease from the first target rotational speed value to the second target rotational speed value when the real-time number of turns reaches the target number of turns.

Abstract: This invention provides an electric screwdriver with an integrated torque adjustment and sensing function, comprising a torque sensor connected between an electric motor and a torque adjuster. The torque sensor comprises a transmission shaft connected to the motor shaft by the shaft, a torque sensing component and at least one planetary gear set. The planetary gear set has a torque output component. The transmission shaft transmits the speed reduced rotational force through the torque output component to drive the output shaft to output a target torque which can be adjusted by the adjuster. The torque sensing component senses the operating torque between the transmission shaft and the torque output component of the torque sensor, thereby assembling to improve the problem that the conventional electric screwdriver can only adjust but cannot accurately sense the operating torque.

Abstract: The present invention provides an axial rotary type torque sensor comprising a planetary gear set disposed along a central axis between an input shaft and an output shaft. The input shaft drives the sun gear which meshes with planetary gears, and the planetary gears mesh with the ring gear of the planetary gear set to rotate along the circumference of the central axis. The ring gear is connected with a plurality of strip-like beams. At least one strain gauge is attached to the beams. One ending portion of the beam is fixed and the other ending portion is used for bearing a tangential force applied on the ring gear to generate a deformation at a rotation direction of a circumference. A strain gauge which senses the strain of the deformation used as a torque sensing value between the input shaft and the output shaft, thereby improving the poor sensing accuracy and sensitivity of the conventional torque sensors and solving the problem that the radial volume cannot be effectively reduced.

Abstract: The present invention provides an axial rotary type torque sensor comprising a planetary gear set disposed along a central axis between an input shaft and an output shaft. The input shaft drives the sun gear which meshes with planetary gears, and the planetary gears mesh with the ring gear of the planetary gear set to rotate along the circumference of the central axis. The ring gear is connected with a plurality of strip-like beams. At least one strain gauge is attached to the beams. One ending portion of the beam is fixed and the other ending portion is used for bearing a tangential force applied on the ring gear to generate a deformation at a rotation direction of a circumference. A strain gauge which senses the strain of the deformation used as a torque sensing value between the input shaft and the output shaft, thereby improving the poor sensing accuracy and sensitivity of the conventional torque sensors and solving the problem that the radial volume cannot be effectively reduced.