An improved speed identification method using incremental encoder in electric drives

The paper presents a variable sampling time method for speed identification using generated pulses from an incremental encoder. The most common procedures for speed identification are: in low speed range the period-measurement-and in high speed range the frequency-measurement-based method. Considering the error that occurs in the classical frequency method for speed calculation, the proposed procedure eliminates that error by increasing the sampling period with the necessarily amount of time in order to synchronize the sampling period with the generated encoder pulses. There are presented simulation results obtained with Matlab/Simulink® structures.