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This paper presents a comparative analyze between several methods that compensate or reduce the errors that occurs in speed identification using incremental encoder. The errors are caused by the lack of synchronization between encoder pulses and sampling time in fixed-time measurement and fixed-position measurement, and also due to the delay between the reference speed and the calculated speed from the incremental encoder pulses. Simulation results, using Matlab/Simulink® structures are presented and discussed. [ABSTRACT FROM PUBLISHER]

This paper presents an appropriate digital current-controlled pulse width modulation method for limiting the switching frequency in voltage-source PWM inverters. The method is suitable for numerical implementation generating switching instants only at constant sampling period given by a fixed clock frequency. To guarantee sequential voltage vector selection which allows only one of the inverter legs to change its state during the sample period, the sampling signal given by fixed clock is shifted 120 degree each other. The validation of proposed current-controlled PWM strategy with regular sampling is illustrated by means of simulation, in programming and simulation environment MATLAB Simulink®, Also, the proposed current-control technique will be compared with other PWM techniques from point of view of total harmonic distortion. [ABSTRACT FROM PUBLISHER]