| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a rotational position detector for a rotating machine where the accuracy in positional detection does not deteriorate due to the magnitude of a detected magnetic flux and the disturbance. <P>SOLUTION: A signal processing part 112 (not shown) calculates signals ▵Hu-v, ▵Hv-w, and ▵Hw-u consisting of differences between two signals each using voltage signals (analog signals) corresponding each to the magnitude of detected magnetic flux Hu, Hv, and Hw corresponding to a U phase, a V phase, and a W phase. Then, the signal processing part 112 converts the calculated signal into a digital signal with a threshold as 0, and outputs the converted digital signal as the positional signals Pu*, Pv*, and Pw* of a rotor 2. Accordingly, regardless of the magnitude of the detected magnetic flux, the ON duty time Ton of the positional signal becomes constant, and the duty ratio of the positional signal becomes constant. <P>COPYRIGHT: (C)2004,JPO&NCIPI |
