Torque-speed sensing device for center shaft of electric bicycle

Abstract

Electric bicycle central axle torque speed sense device comprises a central axle (4) assembled in a five-way tube, a left crank (13) and a right crank (14) fixed on each end of the central axle (4) and a chain wheel (16) sleeved on the central axle (4), and the device is characterized in that: the central axle (4) is sleeved with a torque sleeve (5) which can generate circumferential deformation when bearing circumferential torsional force, one end of torque sleeve (5) is fixed to the central axle (4), the other end is fixed to the chain wheel (16); a circle of magnetism conductive alloy sheet (20) arranged on and abut closely to the torque sleeve are fixed on the outer tube wall of said torque sleeve (5), the magnetism conductive alloy sheet (20) is densely provided with multiple holes (17), coils (19) used for detecting magnetism changes are arranged on the peripheries of the magnetism conductive alloy sheet (20), the coils (19) are connected to motor controller via a signal processor, a speed induction Hall (18) connected with said signal processor is further arranged in the five-way tube, and a speed induction magnetic steel (12) corresponding to the speed-sensitive Hall (18) is fixed on the central axle (6). The structure of the present invention is smart and reasonable in structure, and has induction sensitivity and high accuracy.

Description

technical field [0001] The invention relates to a component of an electric bicycle, in particular to a torque speed sensor device for the center shaft of the electric bicycle. Background technique [0002] Electric bicycles are being increasingly used in my country because of their brisk, labor-saving and pollution-free features. Traditional electric bicycles use the handle to adjust the speed, that is, use the handle to control the output power of the motor. At present, more and more electric bicycles mainly use torque sensors to convert the pedaling force of the foot when riding into a corresponding The voltage signal output is amplified by the motor control circuit board to control the operating power of the motor, which can greatly save energy. [0003] At present, most of the sensors used in electric bicycles are Hall speed sensors. This kind of sensor uses magnetic steel to paste on the surface of rotating parts such as the center shaft or flywheel of the electric bic...

AI Technical Summary

Problems solved by technology

[0005] 2. Since the magnetic steel is not installed on the effective force-bearing part of the central shaft, the displacement change caused by the torsion is not obvious, and it is often obvious at low speeds, but not at high speeds, so the induced potential signal The output is inaccurate, and the working stability and reliability of the sensor are greatly reduced

Images