In many areas where variable frequency drive is needed, induction motors (IM) play an important role. It is therefore very important to properly control the speed using an induction motor. Three-phase asynchronous motors, especially squirrel-cage asynchronous motors, exhibit non-linear behavior in sudden changes and parameter changes in load and variable speed applications. Therefore, an advanced controller is needed to increase the asynchronous motor performance. This study, it is aimed to develop a Fractional Order Sliding Mode Control (FOSMC) rotor flux and speed controller-based system for a vector-controlled induction motor. The relevant models in this study are made using MATLAB/Simulink software tools. Thus, the performance analysis of the IM, sudden load change, variable reference speed conditions, and motor parameter changes are carried out with the developed controller, and the results were interpreted in detail. It has been seen that the intended method is quite durable under different operating conditions such as sudden load, reverse speed step response, reverse speed sine response, parameter change, compared to classical sliding mode (SM) and proportional-integral (PI) controller designs.