Modeling and Performance Impact Analysis of Main Pump Canned Motor Considering Can Failure
Liu Nengqing1, Xiang Xuewei1, Chen Zhi2, Li Hui1, Jiang Peng1
1. State Key Laboratory of Power Transmission Equipment Technology Chongqing University Chongqing 40044 China; 2. Key Laboratory of Nuclear Reactor System Design Technology Nuclear Power Institute of China Chengdu 610213 China
Abstract The can is a critical component of the main pump canned motor, located within the air gap of the main pump. It endures various stresses such as electromagnetic force, coolant pressure, and thermal stress, making it prone to failure. Due to the limited installation space, it is challenging to install relevant sensors to monitor its condition, thus making the study of can faults and their impact on the performance of the main pump canned motor significantly important. Currently, there is a lack of models and analysis focusing on can faults and their effects on the performance of the main pump canned motor. This paper proposes a modeling method that considers can faults and analyzes their impact on the performance of canned motors for main pumps. Firstly, to accurately calculate the performance of the main pump canned motor, a finite element model of the main pump canned motor was established. This model considers three common failure modes of the can: bulging, wear, and cracking. Maxwell finite element models of the main pump canned motor were developed for each type of can fault. Based on finite element calculation results, the impact of different can fault modes and varying degrees of severity on the performance of the main pump canned motor was analyzed. The study revealed that can failures have a significant effect on the eddy current loss within the can, but have minimal impact on back electromotive force and winding current, and relatively little effect on torque and air gap magnetic flux density. Finally, to address the impact of can failures on eddy current losses within the can, an analytical expression for eddy current loss calculation was proposed, considering the cross-sectional area variations of the can due to different fault modes. The changes in eddy current losses under different fault modes and severity levels were analyzed using this analytical expression and compared with simulation results. The results indicate that: (1) When the main pump motor can fails, the maximum change rate of electromagnetic torque is 2.108%, the maximum change rate of air gap magnetic flux density is 1.748%, the maximum change rate of phase A current is 0.103%, and the maximum change rate of back electromotive force is 0.025%. Therefore, compared to other aspects of the main pump canned motor’s performance, can faults have a significant impact on the eddy current loss within the can, consistent with theoretical analysis. Under bulging and wear conditions, the maximum change rate of eddy current loss reached 5%, while under cracking conditions, it reached 14%. (2) The proposed eddy current loss calculation method considering bulging, wear, and cracking areas during can failure is effective, with the error between the analytical calculation and finite element calculation results being less than 5%, further proving the effectiveness of the calculation method. (3) Eddy current losses within the can exhibit a linear relationship with the degree of can failure. When a bulging fault occurs in the stator can, the eddy current loss within the can increases with the degree of bulging. In the cases of wear and cracking faults, the eddy current loss within the can decreases as the extent of wear or cracking increases.
Liu Nengqing,Xiang Xuewei,Chen Zhi等. Modeling and Performance Impact Analysis of Main Pump Canned Motor Considering Can Failure[J]. Transactions of China Electrotechnical Society, 2024, 39(zk1): 25-36.
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2024, Vol. 39 
