This paper provides an overview of several condition monitoring (CM) techniques for the alternating current (AC) motor in a precise manner and this will be useful when selecting proper condition monitoring technique for specific application. Condition monitoring is a process of monitoring operating parameters of machine to reveal the trend of monitored characteristics to predict machine health. Protection of motors has become challenging task in industries. Different condition monitoring techniques are summarized with the specific advantages and disadvantages. Mathematical analysis of stator current is the latest and non-invasive and economical method for the condition monitoring of AC motors. A novel intelligent diagnostic CM system has been proposed. The proposed system will provide continuous real time tracking of different faults and estimates severity of faults for automatic decision making. © 2013 IEEE.