Detection of Rotor and Impeller Faults in Wet-rotor Pumps

The motor current signature analysis (MCSA) for fault detection has found widespread application, especially for induction motors (IM). The basis of the MCSA is the evaluation of the current of a motor. This analysis is now also used for other motor types and can be used to detect faults of the coupled load. The purpose of this paper is to examine whether the MCSA can be used to detect faults in a wet-rotor pump. A total of three faults are examined. The results show that all faults can be detected compared to the healthy pump. However, a detailed analysis of frequency components must be carried out to differentiate the faults. A circulation pump with a maximum power consumption of 1.1 kW is used as the test item.