Abstract: Induction motor is mostly utilized in industrial application due to its favorable, economical and technical reasons. It has been observed that during the operation of drive system, motor faces different types of abnormal condition which in turn create various types of faults and failures in machine thereby affecting the production system. Hence to avoid such faults health monitoring of induction machines have become necessary. Different techniques are used for motor health diagnosis. Basically this techniques are classified into model based technique, signal based technique and soft computing technique. By using these techniques motor can be prevented from various catastrophic failures which in turn increase the efficiency and production. This literature presents a review of various techniques used for fault diagnosis.