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Fig.1 MCSA technology introduction
Fig.1 MCSA technology introduction

An operation detection technique called Motor Current Signal Analysis (MCSA) Technology has been developed since 1970s. It is well developed in motor operation detection but seldom used in pump operation detection. Compared with traditional detecting methods, hall sensors used in this method are cheaper, easier to be installed and less sensitive to external disturbance., In this method, induction motors are regarded as torque transducers as is shown in Fig.1. Through motor current signal analysis, time-frequency characteristics could be extracted for the determination of pump operation condition.

The work principle of MCSA technology is shown in Fig.2. During pump operation, variable flow is forced on the impeller. The torsional vibration of impeller transmitted by axis has influence on air-gap field and changes induced voltage. Consequently, current signal will change as response to such unsteady variation. So Load fluctuation influences current and we can derive the load fluctuation by looking at the current.

Fig.2 Principle of MCSA technology
Fig.2 Principle of MCSA technology

[1] SUN Hui,YUAN Shou-Qi,LUO Yin et al. Internal flow analysis of centrifugal pumps influenced by flow, motor and electricity[J]. Journal of Drainage and Irrigation Machinery Engineering, 2016, 34(2): 122-127.

[2] Luo Y, Yuan S, Yuan J, Hui Sun, et al. Induction motor current signature for centrifugal pump load[J]. Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science, 2016, 230(11): 1890-1901.

[3] Yin Luo，Hui Sun, Shouqi Yuan, Jianping Yuan. Research on Statistical Characteristics of Vibration in Centrifugal Pump[J]. Rev. Téc. Ing. Univ. Zulia. Vol. 38, Nº 1, 49 – 61, 2015

[4] LUO Yin,SUN Hui,LU Jia-Xing et al. Review for sensorless detection technology applied in centrifugal pumps[J]. Journal of Drainage and Irrigation Machinery Engineering, 2015, 33(6): 547-552.

[5] Luo Y, Yuan S, Sun H, et al. Energy-saving control model of inverter for centrifugal pump systems[J]. Advances in Mechanical Engineering, 2015, 7(7): 1687814015589491.

[6] Yin Luo*, Hui Sun, Zhishun Yu. Experimental on energy-saving strategy of the pump system based on the law of the flow variation[J]. Energy Education Science And Technology, Part A Energy Science And Research, v32, n5,p3007-3016,November 1, 2014.

[7] Luo Y, Sun H*, Lu J X, et al. Design of online energy assessment system for pump unit[C]//Applied Mechanics and Materials. 2014, 687: 419-422