Modern control theory and speed adjustment of AC motor——variable structure control with sliding mode

It is introduced the basic concept, mathematical expression and design problems of the variable structure system and the application of AC motor speed adjustment system. The importance of the sliding mode theory in the variable structure system is expressed. It is pointed out that the core idea in the design of variable structure control system is to force the movement towards a specific area in the state space and keep it. For non-linear and non-specific system, the tolerance could be minimized through the variable structure control with sliding mode and the complex procedures as well as the engineering of system control is fairly simplified.