Modeling and Simulation of the Direct Self Control System of Brushless DC Motor

Recently, direct torque control (DTC) has been applied on brushless DC motor (BLDCM). As the result of uncertainty of voltage across the off-phase, the stator flux-linkage changes its value periodically every sixty electric degree. The basic direct self control (DSC) strategy for BLDCM solves these problems, just as this paper presented. The simple structure is holding while the high performance is achieved. Based on the mathematical model of BLDCM, this paper establishes the simulation model of BLDCM-DSC system under Matlab/Simulink circumstances, does simulation of locus of the stator flux-linkage, torque dynamic response, counter electromotive force, current, speed and torque, and obtains waveform of each parameter. Both the simulation and analysis are carries on and the results shows: DSC is especially applicable to BLDCM. The simple structure of DSC for BLDCM produces excellent torque dynamic response within 1 ms.