Rotary table type sensing element with multiple magnets and magnetic fluxes distributed unevenly
A technology with evenly distributed, sensing elements, applied in power measurement, vehicle components, torque measurement, etc., can solve the problems of unstable motor operation, lack of power assistance, and no control signal, and achieve low cost and simple structure. Effect
Inactive Publication Date: 2012-11-28
CHENGDU KUANHE TECH +3
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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 demand model is distorted, causing the motor controller to choose any one of the three control signals as a reference, resulting in the inconsistency between the power-assisted output and the power-assisted demand
[0018] 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.
[0019] 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 torque of the bicycle pedal 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
[0020]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.
Method used
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Embodiment 1
[0054] Embodiment 1. Multi-magnetic blocks and a rotating disk sensor element with non-uniform distribution of magnetic flux
[0055] like figure 1 , one surface of a high-strength plastic rotating disk 1 with a diameter of 10.0 cm is set to a diameter of 0.6-0.8 cm, and the magnetic flux is 146---279 (B·H)max / KJ·m -3 20 permanent magnet blocks 2 with different selection values within the range and unequal magnetic flux of adjacent permanent magnet blocks 2 . The structure of rotating disk 1, permanent magnet block 2 and Hall 3 is as follows:
[0056] Each permanent magnet block 2 is fixed in the circle 6 range between the circular trajectory line 5-1-9.5 centimeters outer circular trajectory line 5-2 with a diameter of 8.5 centimeters, and there are a plurality of permanent magnet blocks 2 that are radially dislocated Distributed, there are a plurality of permanent magnet blocks 2 in dislocation distribution.
[0057] Radius dislocation distribution mode is: the plurali...
Embodiment 2
[0063] Embodiment 2. High-density multi-magnet blocks and a rotating disk sensor element with non-uniform distribution of magnetic flux
[0064] like figure 2 1. A high-strength aluminum rotating disc 1 with a diameter of 10.0 cm is provided with 40 permanent magnet blocks 2 with a diameter of 0.4-0.6 cm. The magnetic flux of the permanent magnet block 2 is 146---279 (B·H)max / KJ·m -3 Different selection values within the range, and the magnetic flux of adjacent permanent magnet block 2 is not equal. Hall 3 keeps a distance of 0.2 cm from each permanent magnet 2 in the rotating state, so that when each rotating permanent magnet 2 passes through Hall 3, Hall 3 can generate a corresponding rectangular wave electric signal output. The structures of other rotating disk 1, permanent magnet block 2, and Hall 3 are the same as those in embodiment 1.
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Abstract
The invention relates to a rotary table type sensing element with multiple magnets and magnetic fluxes distributed unevenly, belonging to the technical field of magnetic induction signal providing, in particular relates to a technology for realizing multi-point position magnetic induction control signal providing on a rotating component. A rotary table is fixedly provided with multiple permanent magnets which are circularly distributed, and spaces and magnetic fluxes of multiple permanent magnets are different from each other, and magnetic polarities of adjacent permanent magnets on one side of the rotary table are opposite, namely a magnetic polarity distribution manner of the all the permanent magnets on one side of the rotary table is an N pole, an S pole, an N pole...; and a Hall is arranged at a position close to the permanent magnets. The rotary table type sensing element with multiple magnets and magnetic fluxes distributed unevenly disclosed by the invention has the advantages that magnetic polarities of adjacent permanent magnets are in an NS opposite distribution manner, thus the Hall can acquire a square-wave signal, and digital processing on a signal can be carried out conveniently; and the spaces and the magnetic fluxes are different, thus the square-wave signal can show positions of the permanent magnets on the rotary table, and applications of different square waves can be 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...
Claims
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Login to View More IPC IPC(8): B62M6/50G01L3/00G01P3/481
Inventor黄强
OwnerCHENGDU KUANHE TECH