Chattering Reduction in the Position Control of Induction Motor Using the Sliding Mode

The induction motor position control system based on the sliding mode control is presented. In the sliding mode control, control function is discontinuous on the hyper-plane, which causes harmful effects such as current harmonics and acoustic noise in the motor drive application. In this study, a low pass filter is introduced between the sliding mode controller output and the motor controller input to reduce these effects. The filter, however, makes the torque response be sluggish and the system performance may become poor in cost of chattering reduction. To overcome these problems, the bandwidth of the filter is varied according to the error function. It is shown that the proposed sliding mode control with variable-bandwidth filter shows good performance, which is confirmed through the computer simulation and experiments.