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Motor Speed Measurement

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I am using a optical encoder to measure the speed of an induction motor(max 3000 rpm) for vector control,my DSP has QEP interface and I just read the timer-counter periodically for speed measurement.

But I found out this speed measurement algarithm is not quite accurate,is there any better speed measurement algarithm?

I would be very grateful if anyone can provide any extra links or reference about this area!


Thanks! :)

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