Real Motor Speed

[billstrong]

Hi,

 

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

 

Thanks!