Robust SMC Control Law for IFOC of Induction Motors Incorporating Hyperbolic Tangent Function

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This paper presents the implementation of a sliding mode control (SMC) law incorporating a hyperbolic tangent switching function as an alternative to traditional PI controllers for indirect field oriented control (IFOC) of an induction motor drive. While PI controllers are simple and widely used, they often struggle with parameter variations, external load disturbances, and the inherent nonlinear characteristics of induction motor systems. Moreover, PI control requires the tuning of two parameters (proportional and integral gains), which can be time consuming and sensitive to operating conditions. Unlike conventional controllers, the proposed SMC scheme requires tuning of only a single switching gain, which simplifies the overall control structure and minimizes the tuning effort. The proposed technique significantly enhances robustness against system uncertainties while effectively minimizing the chattering effect commonly associated with conventional SMC designs. The inclusion of the smooth hyperbolic tangent function introduces a continuous control action, which reduces high-frequency oscillations, improves overall system stability, and yields superior transient and steady state performance compared to traditional methods.

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