Turntable sensor with uniformly distributed magnetic blocks for moped

Abstract

The invention discloses a turntable sensor with uniformly distributed magnetic blocks for a moped, belongs to the technical field of providing a signal by magnetic induction, and particularly relates to a technology for carrying out multi-point magnetic induction to provide a control signal on a rotating component. The turntable sensor comprises a sensing element, a power model processor, a digital-analogue converter and an operational amplifier which are orderly connected, wherein the sensing element is that a plurality of permanent magnet blocks which are distributed in a ring are fixedly arranged on a rotating plate; the magnetic polarities of the adjacent permanent magnet blocks are opposite at one side of the rotating plate, namely the magnetic polarity distribution mode of all permanent magnet blocks at one side of the rotating plate is an N pole, an S pole, the N pole ...; and halls are arranged at the positions near the permanent magnet blocks. The sensor has the advantages that the halls can obtain rectangular wave signals by an opposite distribution mode of the magnetic polarities NS of the adjacent permanent magnet blocks; the signals can be conveniently subjected to digital treatment, and the sensor is the sensor capable of outputting an electric signal with an artificially set control model.

Description

technical field [0001] The invention belongs to the technical field of providing signals by magnetic induction, and in particular relates to the technology of providing control signals by multi-point magnetic induction on a rotating component. Background technique [0002] The Chinese patent 201020295192.0 "Claw Type Torque Sensing Device" applied by Yebao Vehicle Material Industry (Kunshan) Co., Ltd. discloses a sensing device for power-assisted bicycles. The sensing device includes a magnetic part and an elastic part to sense the torque. sensing device. After a long time of use, the change of the elastic coefficient of the elastic member will lead to changes in the sensing signal and the control effect of the controlled motor, and the power-assisted effect will not match the power-assisted needs of people. Moreover, the design structure of the elastic member is complex and the manufacturing cost is high. [0003] The Chinese patent 01201843.0 "Automatic Detection Device ...

AI Technical Summary

Problems solved by technology

[0013] Disadvantages (1) Using two permanent magnetic steels with no difference to represent the fixed positions of the two pedals, only multiple Halls can be used to represent the rotational positions of the pedals: the two magnetic steels have no difference, and the advantages are The fixed position of the two pedals can be indicated 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 magnet itself cannot indicate the rotation position of the pedals, but can only Use multiple Halls at different corner positions to indicate the rotational position of the pedal, so you cannot use only one Hall, but must use multiple Halls

[0014] Disadvantage (2) Only one Hall cannot be used, and 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

[0015] 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 demand model is distorted, causing the motor controller to choose any one of the three control signals as a reference, which will cause the problem that the power-assisted output is inconsistent with the power-assisted demand

[0016] Disadvantages Sensing points cannot be increased arbitrarily, if there are too few sensing points, the operation of the motor will not be stable, making the rider feel very uncomfortable: due to the disadvantages (1) and disadvantage (2) are most caused by the number of Halls being greater than one. Obviously, the more the number of Halls, the more serious the disadvantages (1) and (2) are.

Therefore, the power-assisted bicycle provided by this patent can only be a very bad power-assisted bicycle that makes the rider feel comfortable.

[0017] Disadvantages (5) The signal blind area reaches 42 degrees, and when the power is needed when starting, it is impossible to get it: as we all know, the moment of a person pedaling on a bicycle is the smallest at the apex , from the angle of 10-45 degrees away from the top is the area that needs the most assistance, but the angle between the Halls in this patent is 42.5-43.5 degrees, and there is no Hall in the area of ​​10-42 degrees away from the top of the pedal. There is no control signal, and the result is when the assist is most needed, but the motor of the assist bicycle cannot assist

[0018]In a word, this patent is a technical solution of using multiple Halls to control the booster mode, because only multiple Halls can be used to represent the rotation position of the pedal, and multiple Halls The multiple control signals of Hall must have original errors, and the combined control signals are prone to signal drift, which can cause distortion of the assist demand model, that is, the same assist demand at different times, but different assist effects; the more the number of Halls, the more More, the more serious the distortion of the power-assisted demand model is, the quantity is limited, and the less quantity of Hall causes the motor to run unsteadily, which makes the rider feel very uncomfortable and cannot get power-assisted when starting

To make it undistorted to help the demand model, and to ensure the smooth operation of the motor, there are always two issues. It is impossible to have both.

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