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High-performance control systems for induction motors (IM) such as Indirect Field Oriented Control (IFOC) which are applied to induction motors are widely used for industry and electric vehicle. IFOC represents the mathematical model of an induction motor similar to a DC motor. Therefore, this system is easy to design and implement. A Robust and stable control methods such as Sliding Mode Control (SMC) must be added to ensure its robustness and stability. The drawback of SMC is the high frequency chattering phenomenon that comes from the discontinuous control inputs. However, it could harm the hardware and increase power consumption. Therefore, a boundary layer function is applied in SMC for rotor speed control using the saturation function. This puts a limit on the chattering phenomenon in certain areas. The results show by replacing sign function with saturation function in FOSMC reduces the chattering phenomenon in rotor speed and electromagnetic torque response (transient and steady-state condition), decrease stator current in direct and quadrature axis, and saving power consumption.

Boundary–Layer Effect in Robust Sliding Mode Control for Indirect Field Oriented Control of 3-Phase Induction Motor