Discrete integral variable structure model following control for induction motor drivers

A DSP microprocessor based high performance vector-controlled induction motor driver is presented. The discrete-time integral variable structure model following the control (DIVSMFC) approach is proposed for the outer loop of the driven system. A design procedure is developed for determining the control function, the switching plane and the integral control gain such that the error between the state of the model and the controlled plant is minimised. Simulation and experimental results show that the proposed scheme can achieve accurate position/velocity servo-tracking in the presence of load disturbances and plant parameter variations