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Real Motor Speed

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I am using a 500CPR optical encoder to do vector control


I measure the rotor speed by a fixed time interval. I compare the measure speed with the signal from the encoder output channel and found it slightly higher than the one I measured.but the encoder output channel has a little bit jitter which makes me difficult to estimate the true speed.


How can I konw the real speed of motor?


Anyone successfully used an optical encoder in vector control?It would be very helpful if you can share your source code or experience



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