A survey on condition monitoring and fault diagnosis in line-start and inverter-fed broken bar induction motors

In addition to line-start three-phase squirrel-cage induction motors, inverter-fed motors have been also widely employed in various product lines in recent years. The manufacturers and users of the variable speed drive systems are now concerned about the reliable operation of these systems and emphasized to predictive maintenance of the drives. In line-start motors, current signature analysis has been widely used for fault diagnosis. In addition to the mechanical parameters such as speed and noise, other electrical signals including torque, power, and magnetic field have been also considered and their disturbing features upon the characteristics of the above-mentioned quantities have been utilized for fault detection. Keeping in mind that there is much need for further research on the fault diagnosis in the inverter-fed induction motors, an extensive review on this topic is provided in the present article. This review helps to the new comers in the field who arrive to this area with open mind and carry out further research successfully.