Torque and speed sensor for electric bicycle

Abstract

The invention discloses a torque and speed sensor for an electric bicycle which comprises a chain wheel, a crank and a deformation frame. The deformation frame is formed by an outer ring, an inner ring and a plurality of connecting ribs, wherein the outer ring and the inner ring are coaxially arranged, the connecting ribs are distributed in a radial mode, and the connecting ribs are connected between the inner ring and the outer ring. The inner ring is fixed to the crank, the outer ring is fixed to the chain wheel, and torque sensing magnetic steel and a linear hall integrated circuit corresponding to the torque sensing magnetic steel are respectively arranged on the inner ring and the outer ring. The torque and speed sensor further comprises a movable seat and a fixed seat, wherein the movable seat and the fixed seat are coaxially distributed together with the deformation frame, the movable seat is connected to the deformation frame, an auxiliary edge winding is fixed to the movable seat, the fixed seat is connected to the movable seat and can rotate around the axis of the movable seat, an original edge winding and a signal receiving plate are fixed to the fixed seat, the original edge winding and the auxiliary edge winding jointly form an isolation transformer, the original edge winding is electrically connected with an alternating-current generator arranged on the signal receiving plate, an outgoing line is arranged on the signal receiving plate, and the auxiliary edge winding is electrically connected with a signal outputting plate. The torque and speed sensor for the electric bicycle is simple in structure, stable in performance and high in sensitivity.

Description

technical field [0001] The invention relates to the field of electric bicycles, in particular to a torque and speed sensor of the electric bicycle. Background technique [0002] Because of its light, labor-saving and pollution-free characteristics, electric bicycles are being increasingly used in countries all over the world. Traditional electric bicycles use handlebars to adjust the speed, and there are also so-called smart electric bicycles that use speed sensors to control the output power of the motor. The characteristics of this type of smart electric bicycle are that it is easy to ride on flat ground, but very laborious to go uphill . Electric bicycles using torque and speed sensors are just the opposite. When riding on flat ground, the output power of the motor is very small, which can make people feel easy to ride and save power, but it can output a larger current when going uphill. It saves effort to climb hills, and it is an electric bicycle that truly allows peo...

AI Technical Summary

Problems solved by technology

However, although there are torque and speed sensors in China now, the effect is not satisfactory. The main reason is that the normal torque signal cannot be output at low speeds, causing the force at the start to be either too large or too small to achieve man-machine coordination. When riding hard, the output signal of the sensor is saturated too early, resulting in weak uphill, and the overall working stability and sensitivity are poor

Although foreign countries (especially Japan) have long had such products, their complex structure, high manufacturing difficulty and high cost prevent this type of electric bicycle from being popularized quickly.

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