| 摘要 |
<p>A rotational speed sensor suitable for low speed sensing and effective in reducing the number of wires, wherein a sensor means (11) is driven at a constant voltage by a constant-voltage control means (13) that is controlled by a constant-current means (15) and the constant current of the means (15) is controlled by the on-off output from a comparison means (12), so that a current having a rectangular waveform can flow through feed lines (Vcc, VR) in a superimposed manner. The sensing means (11) includes a sensing section in which magnetoelectric transducers are connected in series and a comparing voltage generating section in which comparing voltage resistors connected in series are connected in parallel to the sensing section.</p> |
