Abstract
When designing the control of a multiphase ac motor its model is usually transformed from the natural reference frame into the equivalent two-phase reference frame. In most cases this simplifies the model and consecutively the control scheme. Since the magnetic field of a brushless dc motor is not sinusoidally distributed, this transformation in common doesn’t simplify the model. This paper presents an approach that leads to a relatively simple model of a brushless dc motor in the rotor d-q reference frame which enables the use of some known methods in the design process of the control. Based on this model, the discrete-time sliding mode torque control of a brushless dc motor is proposed. Simulation results are presented to verify the theoretical study.
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