| 摘要 |
<p>A rotational speed detecting system for a Hall-effect motor, which comprises a pair of Hall-effect elements 14, 15, a rotor magnet, (not shown) magnetised to present N and S poles alternately to the Hall-effect elements, and stator coils 13a-13d, comprises a signal forming circuit 31,32,34,35 for forming a signal when a specific point of the rotating rotor magnet opposes each of the Hall elements and a detection output signal obtaining circuit Q1,Q2,C3,C4,R5,37 for obtaining a speed-proportional output signal having a voltage derived in accordance with the time interval between signals formed by the signal forming circuit. <IMAGE></p> |
