Abstract：In order to further research the application of sensorless detection technology in operation detection of centrifugal pumps, the background and research status of such a technology have been reviewed first. The sensorless detection technology is a kind of method of monitoring pumps through testing the stator current and voltage and analyzing motor torque signal by using induction motors as torque transducers. This could decrease the cost and make it convenient to use. The problems in traditional condition detection technology could be resolved, because most of centrifugal pumps are driven by induction motors. Currently,the research into the centrifugal pump detection technology focuses mainly on the diagnosis of the motor and its mechanical components, identification of centrifugal pump operation condition and extraction and analysis methods of motor output signals. Most of the researches focus on the theory and simulation. Then deficiency in the research of sensorless detection technology applied in centrifugal pump operation detection has been proposed, such as limited research of internal flow state of centrifugal pumps in literatures, less research of identification of specific flow state, little research on the extraction of various internal flow states characteristics in centrifugal pumps. Finally, the future tendency of such a technology has been proposed. The breakthraghof this technology lies in the research of unsteady characteristics of hydraulic load torque, response characteristics of transient hydraulic load torque in centrifugal pump shaft transmission and motor system, as well as extraction of various flow states characteristics in centrifugal pumps.
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