Sensor having multiple magnetic blocks of unevenly distributed magnetic fluxes in housing

A sensor having multiple magnetic blocks of unevenly distributed magnetic fluxes in a housing, comprising:

• a sensing element, a power assistance model processor (21), a digital-to-analog converter (27) and an operational amplifier (28) connected in sequence, and characterized in that:
• the sensing element is adapted for transforming rotational motions of an annular-groove rotating disk (1) to rectangular wave output signals;
• wherein the sensing element comprises the annular-groove rotating disk (1), an annular-groove fixing disk (40), a Hall element (3) and a plurality of permanent magnetic blocks (2);
• a concave of the annular-groove rotating disk (1) is opposite to that of the annular-groove fixing disk (40), and the annular-groove fixing disk (40) is engaged with an annular groove of the annular-groove rotating disk (1) to form a fitting interior-empty housing in which two disks are capable of relatively rotating with each other, the concave of the annular-groove rotating disk (1) and that of the annular-groove fixing disk (40) form a hollow ring (41);
• the plurality of permanent magnetic blocks (2) are fixedly arranged on a portion of the annular-groove rotating disk (1) within the hollow ring (41), and the plurality of permanent magnetic blocks (2) are evenly distributed along a circular trajectory, that is to say, that a distance from each of the permanent magnetic blocks (2) to a circle center of the circular trajectory (5) is same, and a distance between every two adjacent permanent magnetic blocks (2) is same;
• magnetic polarities of every two adjacent permanent magnetic blocks (2) are opposite, the magnetic polarities of all of the permanent magnetic blocks (2) on the annular-groove rotating disk (1) are distributed in a pattern of pole N, pole S, pole N, pole S, pole N, pole S . . . ;
• magnetic fluxes of at least two of the permanent magnetic blocks (2) are different;
• the Hall element (3) is fixedly located on a portion of the annular-groove fixing disk (40) within the hollow ring (41), and is located at a position which is close to the permanent magnetic blocks (2) and capable of inducting the magnetic flux of each of the permanent magnetic blocks (2), a distance is provided between the Hall element (3) and the permanent magnetic blocks (2);
• the Hall element (3) is adapted for generating the rectangular wave output signals aiming at two opposite magnetic polarities;
• the power assistance model processor (21) is a signal form converter adapted for converting rotating digital signals of the annular-groove rotating disk (1) to power assistance model digital signals;
• wherein the power assistance model processor (21) comprises an analog-to-digital converting and wave peak recognizing device (22), a power assistance starting point selector (23), a magnetic block rotation rate calculator (24), a power assistance model storage (25) and a power assistance model calculator (26);
• the analog-to-digital converting and wave peak recognizing device (22) connected with the sensing element recognizes a wave peak of each of the rectangular waves inputted by the Hall element (3) of the sensing element, converts each of the rectangular wave signals to various digital signals, marks each of the rectangular waves, and outputs magnetic block moving digital signals marked with positions and orders of the magnetic blocks;
• the analog-to-digital converting and wave peak recognizing device (22) is connected with the power assistance starting point selector (23) and the magnetic block rotation rate calculator (24), the power assistance starting point selector (23) is connected with the magnetic block rotation rate calculator (24);
• the magnetic block rotation rate calculator (24) calculates rotation rates of the annular-groove rotating disk (1) via the magnetic block moving digital signals marked with the positions and orders of the magnetic blocks and inputted by the analog-to-digital converting and wave peak recognizing device (22), and converts rotation rate digital signals of the annular-groove rotating disk (1) to the power assistance starting point selector (23), the power assistance starting point selector (23) determines a certain rectangular wave corresponding to one power assistance starting point under a certain rotation rate condition via the magnetic block moving digital signal marked with the positions and orders of the magnetic blocks and the rotation rate digital signal of the annular-groove rotating disk (1), namely, determines a power assistance staring point magnetic block;
• both the power assistance starting point selector (23) and the magnetic block rotation rate calculator (24) are connected with the power assistance model calculator (26), the power assistance model storage (25) is also connected with the power assistance model calculator (26);
• the power assistance model calculator (26) selects a certain power assistance model function of the power assistance model storage (25) via the power assistance starting point magnetic block determined by the power assistance starting selector (23) and the rotation rate of the annular-groove rotating disk (1) calculated by the magnetic block rotation rate calculator (24), the power assistance starting point magnetic block and the rotation rate of the annular-groove rotating disk (1) are inputted into the power assistance model function to calculate a power assistance model digital signal under these two conditions, that is to say, that the power assistance model calculator (26) outputs the power assistance model digital signals;
• the digital-to-analog converter (27) is adapted for converting the power assistance model digital signals to power assistance model analog signals;
• wherein the power assistance model calculator (26) is connected with the digital-to-analog converter (27), and the digital-to-analog converter (27) converts the power assistance model digital signals of the power assistance model calculator (26) to the power assistance model analog signals;
• the operational amplifier (28) is adapted for converting the power assistance model analog signals of the digital-to-analog converter (27) to power assistance model analog signals within a rated voltage range.