Abstract
In this paper, a new M/T method of variable sampling period is introduced for speed measurements by optical incremental encoders. In this method, we estimated the number of encoder pulses to count in next counting interval at the end of every sample period, so the sampling intervals were variable. Both encoder pulse and high frequency clock pulse were counted in the variable intervals and the counting of clock pulses begins and ends at the exact rising age of the encoder pulse. Through this method, the error is only one clock pulse which is much shorter than encoder pulse, which guarantees a more accurate speed measurement and rapid response of motor system.
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