A sliding mode current control scheme for PWM brushless DC motordrives

摘要

This paper proposes a sliding mode current control scheme fornpulsewidth modulation (PWM) brushless DC motor drives. An improvedn“equivalent control” method is used in this scheme. A simplenalgorithm is proposed that differs from the original equivalent controlnmethod, which requires extensive calculation to estimate the loadnparameters. This algorithm can be implemented using logic circuits.nMoreover, using autotuning, the proposed algorithm can be appliednwithout load information. An operating principle for the power stagenswitching devices called single-side firing is also proposed.nSingle-side firing solves the dead-time problem, allowing the PWMnfrequency to be increased and the sampling rate to be raised. This papernexplains the current control algorithm, single-side firing principle,nand implementation of the proposed scheme in detail. Simulations andnexperimental results are given to show the validity of this scheme