| 摘要 |
PURPOSE:To enable giving of highly accurate signal both for the detections of speed and position by generating a low-frequency false sine wave for speed detection while a high-frequency pulse signal is generated for position detection from the false sine wave. CONSTITUTION:An encoder waveform shaping circuit is made up of detectors 1 and 2 into which quantity of light or magnetism varying with a phase difference of electric angle 90 deg. from each other, AC connectors 3 and 4, a inversion circuit 5 and pulse formation circuits 6 and 7. Electrical signals A1 and A2 outputted from the detectors 1 and 2 as a false sine wave having DC component having a phase difference of 90 deg. are converted into false sine wave signals B1 and B2 with a fixed amplitude having no DC component with the AC connectors 3 and 4. Then, the signals B1 and B2 are converted into n-fold frequency pulse trains C1 and C2 with the pulse formation circuits 6 and 7 and the inversion circuit 5. Thus, a highly accurate signal can be given both for the detections of speed and position. |
