The experimental results confirmed that the performance of fuzzy-control system is satisfactory, incrementing robustness in relation to load-torque variations while achieving the reference speed. Thus, the proposed fuzzy-control system is an acceptable alternative method for V/f common control applications, where a high dynamic and precise response is not required. The comparative analysis with conventional PI controllers demonstrated that the proposed method achieved better results by suppressing speed overshoot and ripple. Regarding the PID controller, the fuzzy system presented similar behavior. The proposed embedded fuzzy system has a simplified architecture which reduces memory-space requirements. Although it implies an additional computational cost, this does not compromise the practical performance in a V/f control
system. The total memory space allocated for the whole embedded fuzzy-control system was estimated to be approximately 6 kB × 16. Furthermore, the same methodology can be applied to the symmetrical Gaussian membership function with a similar computational effort, being ideal for applications with smoother fuzzy surface decisions.Moreover, since the proposed method determines membership functions by indexation, it enables larger quantities of linguistic terms to be constructed