| 摘要 |
PURPOSE:To attain real-time, high-precision phase correction by a simple data processing system through simple operation by inputting a known phase difference and a coefficient of correction to a storage device, and multiplying its output value by a sine wave signal and thus calculating an angle correcting value. CONSTITUTION:A sine wave detector 2 and a cosine wave detector 3 are connected to an encoder 1 and their detected values are inputted to an angle computing element 6 through A/D converters 4 and 5 respectively to calculate the angle value. A phase difference setting switch 7 for inputting the known phase difference, on the other hand, is provided and its set value and coefficient K of correction are stored in a storage device 8. The absolute value of the sine wave signal is similar to an angle measurement error curve, so the output value of the storage device 8 and the output value of the A/D converter 4 are inputted to a multiplier 9 to obtain the angle correcting value. This angle correcting value is subtracted from the output of the angle computing element 6 by a subtracter 10 to obtain a corrected angle signal, which is displayed on a display device 11.
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