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Design and implementation of fuzzy logic controller for mobile robot navigation in unknown environments is presented. The task of navigation is divided into three behaviors namely hurdle avoidance, wall following and goal seeking. The outputs from these behaviors are combined to generate collision free motion of robot amongst obstacles in reaching the target. The controllers for these behaviors are designed using Fuzzy Logic toolbox of MATLAB(r) and their implementation is realized with readily available and inexpensive AT89C52 microcontrollers. Finally, the robot with these controllers is...

The emphasis on the theoretical study and simulation of the three phase induction motor drives is certainly due to the fact of fatal hazards associated with the high voltage and current signals present in the three phase induction motor drives. Other important feature is the cost of a full-scale drive system to test various switching, control and protection strategies. Therefore, design stage comes after a reasonable confidence and verification of the drive circuit and control strategies through simulations. In this work, a laboratory-scale low-voltage induction motor drive is designed which...