Abstract: A sensor having multiple magnetic blocks of unevenly distributed magnetic fluxes in a housing includes, sequentially connected, a sensing element, a power-assisted model processor (21), a digital-to-analog converter (27), and an operational amplifier (28). The sensing element includes a rotating disk (1) and an annular-groove fixing disk (40) fitted therewith. Multiple permanent magnetic blocks (2) are fixedly arranged on the rotating disk (1) in a circular-annular distribution, and at least two of the permanent magnetic blocks (2) are different in magnetic fluxes. On a certain side of the rotating disk (1), the magnetic polarities of all of the permanent magnetic blocks (2) on the certain side of the rotating disk (1) are distributed in a pattern of pole N, pole S, pole N . . . ; a Hall element (3) on the fixing disk (40) is arranged at a position which is close to the permanent magnetic blocks (2).

Abstract: A sensor with magnetic blocks unevenly distributed in a housing includes, sequentially connected, a sensing element, a power assistance model processor (21), a digital-to-analog converter (27), and an operational amplifier (28). The sensing element includes permanent magnetic blocks (2) and a Hall element (3) arranged in a cavity fitted together by a rotating disk (1) and a fixing disk (40). Multiple permanent magnetic blocks (2) are fixedly arranged on the rotating disk (1) in a circular-annular distribution, and at most two of the permanent magnetic blocks (2) are different in intervals. On a certain side of the rotating disk (1), the magnetic polarities of adjacent permanent magnetic blocks (2) are opposite, namely, the magnetic polarities of all of the permanent magnetic blocks (2) on the certain side of the rotating disk (1) are distributed in a pattern of pole N, pole S, pole N.

Abstract: A power-assisted bicycle having a sensor with multiple magnet positions and magnetic fluxes unevenly distributed in a shell includes a sensor which includes a sensing element, a power assistance model processor, a digital-to-analog converter and an operational amplifier which are connected successively. The sensing element includes a rotary wheel, a static wheel, permanent magnets and a Hall component which are embedded within a hollow internal of the rotary wheel and said static wheel. On the rotary wheel, magnetic poles of the neighboring permanent magnets are opposite; the permanent magnets are spaced differently and have different magnetic fluxes. The Hall component on the static wheel is provided in proximity to the permanent magnets. The sensor is sleeved onto a middle shaft; the OPA is connected to a motor controller. Relative positions between the permanent magnets and the Hall component are fixed; the Hall component obtains a rectangular wave signal.

Abstract: A power-assistance bicycle using a sensor having multiple magnet blocks evenly distributed in a housing, related to electric power-assistance bicycles that provide a power-assistance signal with multipoint magnetic induction. The sensor comprises: a sensing element, a power-assisted model processor, a digital-to-analog converter and an operational amplifier. The sensing element comprises a rotating disk and an annular-groove fixing disk fitted with each other, and a permanent magnetic block and the Hall element are provided in a cavity of the rotating disk and the annular-groove fixing disk. A plurality of permanent magnetic blocks that are opposite in adjacent magnetic polarities are fixedly provided on the rotating disk. The Hall element is provided on the fixing disk and in proximity to the permanent magnetic blocks. The sensor is sleeved on an exterior of a medial axis. The operational amplifier is connected with the motor controller.