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Load torque impact on DC motor current control accuracy

The paper presents dynamic properties of a current controlled DC motor drive supplied by a transistor four-quadrant pulse converter. The contribution deals with accuracy of a torque producing armature current control loop from the view of the load torque. There is shown fundamental mathematical description for the control structure of a DC motor drive with respect to the armature current. The derivations of the steady-state current deviation for the control scheme is presented. The properties are verified by MATLAB-SIMULINK program. The simulation results are presented and discussed in the end of the paper.