| 摘要 |
A sensor having multiple magnet blocks evenly distributed in a housing, related to the technical field of providing a signal with magnetic induction, and specifically to a technique of providing a control signal by performing a multipoint magnetic induction on a rotating part. Comprised are, sequentially connected, a sensing element, a power-assist model processor (21), a digital-to-analog converter (27), and an operational amplifier (28). The sensing element comprises permanent magnet blocks (2) and a Hall element (3) arranged in a cavity fitted together by a rotating disk (1) and a fixed disk (40). Fixedly arranged on the rotating disk are the multiple permanent magnet blocks in a circular-annular distribution, and the magnetic polarities of adjacent permanent magnet blocks are opposite, that is, distributed in a pattern of N pole, S pole, N pole...; the Hall element on the fixed disk is arranged at a position in proximity to the permanent magnet blocks. Advantages: by utilizing the distribution of the magnetic polarities of adjacent permanent magnet blocks in the opposing N-S pattern, the Hall element is allowed to acquire a rectangular wave signal, thereby facilitating the addition of a digital processing for setting a power-assist model with respect to the signal; the relative positions of the permanent magnet blocks and of the Hall element are fixed, and signal output is reliable. |
