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- 주제어 : Submersible motor (검색결과 10 건)
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Qiang Lv,Xiaohua Bao,Yigang He 대한전기학회 2014 Journal of Electrical Engineering & Technology Vol.9 No.1
Rotor eccentricity is one of the major factors that directly influence the security of horizontal electrical machines, and the critical speed of the shaft has a close relationship with vibration. This paper deals with the influence of thermal expansion on the rotor eccentricity and critical speed in large dry submersible motors. The dynamic eccentricity (where the rotor is still turning around the stator bore centre but not its own centre) and critical speed of a three-phase squirrelcage submersible induction motor are calculated via hybrid analytical/finite element method. Then the influence of thermal expansion is investigated by simulation. It is predicted from the study that the thermal expansion of the rotor and stator gives rise to a significant air-gap length decrement and an inconspicuous slower critical speed. The results show that the thermal expansion should be considered as an impact factor when designing the air gap length.
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Lv, Qiang,Bao, Xiaohua,He, Yigang The Korean Institute of Electrical Engineers 2014 Journal of Electrical Engineering & Technology Vol.9 No.1
Rotor eccentricity is one of the major factors that directly influence the security of horizontal electrical machines, and the critical speed of the shaft has a close relationship with vibration. This paper deals with the influence of thermal expansion on the rotor eccentricity and critical speed in large dry submersible motors. The dynamic eccentricity (where the rotor is still turning around the stator bore centre but not its own centre) and critical speed of a three-phase squirrel-cage submersible induction motor are calculated via hybrid analytical/finite element method. Then the influence of thermal expansion is investigated by simulation. It is predicted from the study that the thermal expansion of the rotor and stator gives rise to a significant air-gap length decrement and an inconspicuous slower critical speed. The results show that the thermal expansion should be considered as an impact factor when designing the air gap length.
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Wang, Liguo,Feng, Mingliang,Tian, Zhenteng,Bai, Yang,Xu, Jianxin,Wang, Zongjie The Korean Institute of Power Electronics 2022 JOURNAL OF POWER ELECTRONICS Vol.22 No.11
To monitor, diagnose, and suppress the inter-turn short-circuit faults (ITSCFs) of a submersible motor, an approach for the on-line identification of its winding faults has been proposed based on monitoring the stator current. First, an ITSCF model with the global leakage referred to the stator is given. With this model, the detection parameter, which is equal to the ratio of the turns of the fault windings to the total turns of the windings in the healthy phase, can be derived. Second, a faulty model described by the fourth order state-space equation of the motor with a winding fault has been given. Based on sampled stator voltage and stator current, the detection parameter has been solved and used to estimate the location and the turns of inter-turn short-circuit windings of the motor in real time. The accuracy and the robustness of the proposed approach has been illustrated with a 1.5 kW motor that is fed by a 10 kW inverter. Experiment shows that the identification accuracy in terms of the number of the ITSCF windings of the motor stator is less than 3. It can give a reference for the on-line diagnose the ITSCFs of the stator windings of a submersible motor that works in 2 km deep well.
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Xiaohua Bao,Chong Di,Yong Fang 대한전기학회 2016 Journal of Electrical Engineering & Technology Vol.11 No.1
Generally, closed slots are adopted to reduce the water friction loss in both the stator and the rotor of water filling submersible motor due to the special environment of operation. One of the obvious differences between the traditional induction motors and water filling submersible motors is that the submersible motors only need relatively smaller starting torque. This paper aims to analyze the slot leakage reactance of water filling submersible motor during starting transient operation. An improved analytical method which considered the magnetic saturation of the slot bridge and the skin effect of rotor bars is proposed. The slot permeance factor which has a direct impact on the slot leakage reactance is calculated. Then finite element models with different stator slot types are constructed and search coils are introduced to measure the slot flux linkage. Moreover, the starting performances of the models with two typical stator slots are compared and the flux leakage characteristics are obtained. Finally, the results obtained by finite element method are very close to the results obtained by analytical method.
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Bao, Xiaohua,Di, Chong,Fang, Yong The Korean Institute of Electrical Engineers 2016 Journal of Electrical Engineering & Technology Vol.11 No.1
Generally, closed slots are adopted to reduce the water friction loss in both the stator and the rotor of water filling submersible motor due to the special environment of operation. One of the obvious differences between the traditional induction motors and water filling submersible motors is that the submersible motors only need relatively smaller starting torque. This paper aims to analyze the slot leakage reactance of water filling submersible motor during starting transient operation. An improved analytical method which considered the magnetic saturation of the slot bridge and the skin effect of rotor bars is proposed. The slot permeance factor which has a direct impact on the slot leakage reactance is calculated. Then finite element models with different stator slot types are constructed and search coils are introduced to measure the slot flux linkage. Moreover, the starting performances of the models with two typical stator slots are compared and the flux leakage characteristics are obtained. Finally, the results obtained by finite element method are very close to the results obtained by analytical method.
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Improved Speed Sensorless Vector Control Algorithm of Induction Motor Based on Long Cable
Yonghong Deng,Zhishan Liang,Pengcheng Xia,Xin Zuo 대한전기학회 2019 Journal of Electrical Engineering & Technology Vol.14 No.1
In many applications, especially electrical submersible pump required remote operation of inverter via a long motor cable. The conventional control algorithm of induction motor (IM) didn’t operate effectively, which ignored the influence of the cable length, and didn’t consider the effect of long cable distribution parameters. A speed sensor technique was also difficult to achieve. In this paper, an improved speed sensorless vector control algorithm (ISSVCA) for IM based on long cable was proposed. Based on the analysis of long cable motor drive system of the inverter, the two-port π network model of the long cable was established. The functional relationship between the voltage/current parameters of the two ports of the long cable and the cable distribution parameters was deduced. The function expression was transformed to the α − β stationary reference frame, the accurate motor terminal voltage/current was calculated, so that the flux model was constructed to realize the observation of the flux, accurate velocity identification, and closed-loop control of the torque, flux and current. Simulation and experimental results showed that the proposed ISSVCA based on long cable increased the starting electromagnetic torque, decreased speed dip and speed recovery time caused by sudden loads, reduced the DC current harmonics, and had good dynamic and static characteristics.
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Detection of Eccentricity Fault Using Slot Leakage Flux Monitoring
Hanfeng Wang,Xiaohua Bao,Chong Di,Zhiheng Cheng 전력전자학회 2015 ICPE(ISPE)논문집 Vol.2015 No.6
Eccentricity is a common fault in the running of electrical machines. Aimed at the problem, a new approach to detect eccentricity fault is presented by monitoring the slot leakage flux of stator in this paper. In order to measure the slot leakage flux, two placements of search coil in the stator slot are applied. Firstly, the theoretical analysis shows the slot leakage flux contains more information about eccentricity fault than the stator current does. Then the submersible motor as a model, the induced voltages of search coil and the stator currents are obtained by finite element simulation under healthy motor, static, dynamic and mixed eccentricity, respectively. And various analysis and comparisons of simulations are made. The results show that monitoring the slot leakage flux is effective and has more advantages than the motor current signature analysis.
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원유의 생산증진을 위한 효율적인 펌프종류, 장단점, 설계에 관한 조사
임준석,손채훈,김덕수,구영하,전상규,배위섭 한국자원공학회 2009 한국자원공학회지 Vol.46 No.6
원유 생산에 사용되는 펌프들은 펌프잭(pump jack), 모노펌프(PCP; progressive cavity pump), 수중모터펌프(ESP; electrical submersible pump), 분사펌프(jet pump) 등이 있다. 본 해설 논문에서는 각 펌프의 구동원리와 장단점을 조사하였다. 이들 펌프 중 고유량에 적합한 수중모터펌프의 핵심요소인 임펠러의 설계 사례를 보여주었다. 설계한 임펠러의 형상을 가지고 수치해석을 수행하여 임펠러 주위의 압력장, 속도장 등을 구하고 설계한 임펠러 형상의 적합성을 검토하였다. 또한, 현재 주요 원유 생산 현장에서 사용되고 있는 원유 생산 펌프들의 사양을 조사하여 제시하였다. Pump jack, progressive cavity pump, electrical submersible pump, and jet pump are widely used for petroleum production. In this paper, working principles and characteristics of the pumps are summarized. Among them, the electrical submersible pump is suitable for large mass flow rates. Pump impeller is one of the most important elements in centrifugal pump and it has been designed through the empirical method. Empirically designed elements are numerically analyzed using CFD method. From the numerical results, pressure and velocity fields are investigated and thereby, the empirically designed elements are improved if necessary. An example of impeller design is presented in detail. Performances of major petroleum production pumps adopted at production fields are also presented.
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