Sliding mode control of brushless DC motor speed with chattering reduction

This paper proposes the use of an analog switching function in sliding mode control for a brushless DC motor speed, with the objective of input chattering reduction. The sliding mode control topology is used in the mechanical speed loop control as well as in the stator current loop control. The results show a good chattering reduction, a good machine performance and a good robustness of the controller due to disturbances, without the need of fine tunneling of the controller parameters, as in other kinds of control. The parameters of a real machine where used in the simulations. This kind of function in the used sliding mode controllers turned to be a very good alternative depending on the application.