Rotary disc type sensing element with unevenly distributed magnets

Abstract

The invention discloses a rotating disc type sensing element with a plurality of unevenly distributed magnet blocks, belongs to the technical field of providing signals through magnetic induction, and in particular relates to the technology of providing a control signal through multi-point position magnetic induction on a rotating part. A plurality of permanent magnets distributed annularly are fixedly arranged on a rotating disc, and the spacings between the plurality of permanent magnets are different; the adjacent permanent magnets are opposite in magnetic polarity on one surface of the rotating disc; in other words, the distribution manner of the magnetic polarities of all permanent magnets on one surface of the rotating disc are pole N, pole S, pole N...; and a hall is arranged in a position in the vicinity of the permanent magnets. The rotating disc type sensing element with the plurality of unevenly distributed magnet blocks has the following advantages that with the opposite N-S distribution manner of the magnetic polarities of the adjacent permanent magnets, the hall is capable of obtaining a rectangular wave signal, thereby facilitating digital processing of the signal; and as the spacings between the plurality of permanent magnets are different, the rectangular wave signal is capable of indicating the positions of the permanent magnets on the rotating disc; and therefore, the uses of different rectangular waves are determined.

Description

Technical field [0001] The present invention belongs to the technology field of magnetic induction signal, especially involving a multi -bit magnetic induction technology to provide control signals on a rotor part. Background technique [0002] China Patent 201020295192.0 "Hook Claw Torque Sensing Device" applied for the China Patent Industry (Kunshan) Co., Ltd. revealed a sensing device for bicycles. The sensing device includes magnetic parts and elastic pieces.Sensing device.After a long period of use, the elastic coefficient change of elastic parts will cause the sensing signal and the control effect of the controlled motor to change, and the help effect becomes unsuccessful with the help of people.And the design structure of elasticity is complex and the manufacturing cost is high. [0003] The Chinese Patent 01201843.0 "Electric Help Automatically detecting Device" applied for Beijing University of Science and Technology has released an automatic detection device of electric...

AI Technical Summary

Problems solved by technology

[0015] Disadvantages (1) Using two permanent magnets with no difference to represent the fixed positions of the two pedals, only multiple Halls can be used to represent the pedals Rotation position: There is no difference between the two permanent magnets. The advantage is that the fixed positions of the two pedals can be expressed regardless of the left and right feet, so that the left and right feet can generate power assistance requirements, which can produce the same motor power assistance effect; but the disadvantage is that The permanent magnetic steel itself cannot indicate the rotation position of the pedal, but can only use multiple Halls at different corner positions to indicate the rotation position of the pedal, so it is not possible to use only one Hall, but must use multiple Halls

[0016] Disadvantage (2) Only one Hall cannot be used, but three Halls will inevitably cause the original segmentation error of the three control signals, which will distort the power-assist demand model, naturally The generation of power output is inconsistent with the demand for power assistance: no matter whether the power-assisted bicycle has one or two motors, the sensor signal for controlling the motor can only be controlled by using one sensor signal input to the motor controller; and the patent uses three sensors. If Hall controls the motor, the three control signals of the three Halls must be combined into one combined control signal before it can be input to the motor controller

The sensing parameters of the three Halls cannot be the same, especially due to changes in ambient temperature and long-term use, the sensing parameters of the three Halls may vary greatly. The output voltages are different, resulting in different power output of the motor, and the power output is inconsistent with the power demand; similarly, when the power demand is the same, the outputs of different Halls may be the same voltage, resulting in the same power output of the motor, and also There is a problem that the power output is inconsistent with the power demand

[0017] Disadvantages (3) The combined control signal is prone to signal drift, which makes the combined control signal not match the motor controller, and the power-assisted demand model is distorted: due to changes in ambient temperature and use time After a long period of time, the sensing parameters of the three Halls may vary greatly, and the connection points of the three control signals of the three Halls will inevitably change, so the combined control signals generated by the same boosting demand will produce segmental signal drift. Combining the control signals as a whole produces signal distortion, that is, the power-assist...

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