交流电机轴电流高频模型精确建模

doi:10.19595/j.cnki.1000-6753.tces.231618

Abstract
Figure/Table
References
Related Citation (15)

Download: PDF (3147 KB) HTML (1 KB)
Export: BibTeX | EndNote (RIS)

Abstract The regulation technology for PWM variable frequency speed significantly enhances the dynamic performance of the motor drive system. However, it also introduces adverse effects like bearing electric corrosion. The high-frequency common-mode voltage output by the frequency converter induces bearing voltage and bearing currents inside the motor, leading to bearing electric corrosion and reducing the bearings' lifespan. The high-frequency model of motor bearing current can accurately simulate and predict the bearing current. In practical applications, it helps to identify key parameters and influencing factors of the bearing current, evaluate potential bearing electric corrosion risks, develop predictive maintenance plans, and guide the design of suppression schemes.
Due to the advantages of simple calculation, high precision, and clear physical meaning, the establishing method of the high-frequency model of bearing currents based on the impedance curve has garnered wide attention. This paper analyzes the error sources and ranges of three existing high-frequency models, pointing out the poor fitting performance of existing models in the mid-frequency range. A high-frequency bearing currents model with high accuracy is proposed based on the distributed parameter model. Then, the impedance analyzer is used to test a 190 kW motor, and the port impedance characteristic curves are obtained. The resonance mechanism and equivalent circuit of the motor under low frequency, medium frequency, and high frequency are analyzed. The characteristic points at different frequencies are used to solve the parameters to consider the influence of each frequency band. Finally, multiple simulation circuits are constructed to verify the new model's accuracy.
The root mean square error of the port impedance at the key frequency points is taken as the evaluation index. Compared with the existing methods, the new method reduces the impedance error between the stator winding and the frame by more than 50% in the frequency range 100 kHz~10 MHz, which has higher accuracy. In the wideband range of 100 Hz~10 MHz, the amplitude-frequency and phase-frequency characteristics of the improved model are in good agreement with the measured impedance curves. It is proved that this method has universal applicability in modeling the high-frequency bearing current of AC motors.
In summary, an improved high-frequency model of the distributed-parameter bearing current is presented. The model parameters are calculated according to the characteristic resonance points in each frequency band of the motor impedance characteristic curve. Thus, the problem of large frequency band error is solved, showing high accuracy in the wide frequency range 100 Hz~10 MHz. This method can be applied to analyze the high-frequency bearing current in other types of motors, providing theoretical and technical support for the bearing corrosion risk assessment and bearing current suppression design. It has practical engineering significance for improving equipment reliability, reducing maintenance costs, and preventing bearing electric corrosion.

Key words： AC motor bearing current high frequency model impedance characteristics

Received: 06 October 2023

PACS:

TM315

	Service

	E-mail this article
	Add to my bookshelf
	Add to citation manager
	E-mail Alert
	RSS
	Articles by authors
	Liu Ruifang
	Li Zhihao
	Li Zhaolin
	Zhang Liangliang
	Li Weili

Cite this article:

Liu Ruifang,Li Zhihao,Li Zhaolin等. Accurate Modeling of High Frequency Bearing Currents in AC Motors[J]. Transactions of China Electrotechnical Society, 2024, 39(22): 7019-7029.

URL:

https://dgjsxb.ces-transaction.com/EN/10.19595/j.cnki.1000-6753.tces.231618 OR https://dgjsxb.ces-transaction.com/EN/Y2024/V39/I22/7019

[1] 白保东, 刘威峰, 王禹, 等. PWM驱动感应电机轴电压轴承电流[J]. 电工技术学报, 2013, 28(增刊2): 434-440.
Bai Baodong, Liu Weifeng, Wang Yu, et al.PWM driving induction motor shaft voltage bearing current[J]. Transactions of China Electrotechnical Society, 2013, 28(S2): 434-440.
[2] Busse D, Erdman J, Kerkman R J, et al.System electrical parameters and their effects on bearing currents[J]. IEEE Transactions on Industry Applications, 1997, 33(2): 577-584.
[3] Busse D, Erdman J, Kerkman R J, et al.Bearing currents and their relationship to PWM drives[J]. IEEE Transa- ctions on Power Electronics, 1997, 12(2): 243-252.
[4] 陈立珂, 刘瑞芳, 李知浩, 等. 电缆参数对变频驱动电机轴电压和轴电流的影响[J/OL]. 电工技术学报, 1-13[2023-12-06]. DOI: 10.19595/j.cnki.1000-6753. tces.231160.
Chen Like, Liu Ruifang, Li Zhihao, et al.The influence of cable parameters on the bearing voltage and bearing current of the variable frequency drive motor[J/OL]. Transactions of China Electrotechnical Society, 1-13[2023-12-06]. DOI: 10.19595/j.cnki.1000- 6753. tces.231160.
[5] 贾磊, 刘瑞芳, 李知浩, 等. 永磁同步风力发电机高频共模电流谐波分布及幅值影响因素研究[J]. 电工技术学报, 2023, 38(增刊1): 101-113.
Jia Lei, Liu Ruifang, Li Zhihao, et al.Study on the influence factors of harmonic distribution and amplitude of common-mode current of permanent magnet syn- chronous wind turbines[J]. Transactions of China Electrotechnical Society, 2023, 38(S1): 101-113.
[6] 李知浩, 刘瑞芳, 张亮亮, 等. 绝缘轴承对变频电机高频轴电流的抑制机理与效果[J]. 电工技术学报, 2024, 39(4): 1046-1058.
Li Zhihao, Liu Ruifang, Zhang Liangliang, et al.The suppression mechanism and effects of insulated bearings on high frequency bearing current[J]. Transactions of China Electrotechnical Society, 2024, 39(4): 1046-1058.
[7] 孙全增, 张志锋. 双三相永磁同步电机低共模电压模型预测电流控制[J]. 电工技术学报, 2023, 38(14): 3708-3722.
Sun Quanzeng, Zhang Zhifeng.Low common-mode voltage model predictive current control for dual three-phase permanent magnet synchronous motor[J]. Transactions of China Electrotechnical Society, 2023, 38(14): 3708-3722.
[8] 赵方伟, 王秀和, 赵文良, 等. 内置式永磁同步电机动态偏心故障下的轴电压解析分析和削弱[J]. 电工技术学报, 2022, 37(4): 837-848.
Zhao Fangwei, Wang Xiuhe, Zhao Wenliang, et al.Analysis and reduction of shaft voltage in interior permanent magnet synchronous motors under dynamic eccentricity fault[J]. Transactions of China Electrotechnical Society, 2022, 37(4): 837-848.
[9] 李剑立, 武玉才, 卢伟甫. 水轮发电机机电故障的轴电压特征分析及诊断[J]. 电机与控制学报, 2023, 27(9): 10-18.
Li Jianli, Wu Yucai, Lu Weifu.Shaft voltage characteristics analysis and diagnosis of hydro- generator electromechanical faults[J]. Electric Machines and Control, 2023, 27(9): 10-18.
[10] 白保东, 王禹, 陈志雪, 等. 基于电磁屏蔽法变频电机轴承电流抑制研究[J]. 电工技术学报, 2016, 31(7): 33-39.
Bai Baodong, Wang Yu, Chen Zhixue, et al.Inhibition of bearing currents in frequency variable motor based on electromagnetic shielding[J]. Transactions of China Electrotechnical Society, 2016, 31(7): 33-39.
[11] Chen Shaotang, Lipo T A, Fitzgerald D.Modeling of bearing currents in PWM inverter drives[C]// IEEE Industry Applications Conference, Orlando, FL, USA, 1995, 388-393.
[12] Chen Shaotang, Lipo T A, Fitzgerald D.Source of induction motor bearing currents caused by PWM inverters[J]. IEEE Transactions on Energy Conversion, 1996, 11(1): 25-32.
[13] Mohammed O A, Ganu S, Abed N, et al.High frequency PM synchronous motor model determined by FE analysis[J]. IEEE Transactions on Magnetics, 2006, 42(4): 1291-1294.
[14] 贾磊, 刘瑞芳, 王芹芹. 变频驱动感应电机轴电流问题中端部杂散电容的解析计算[J]. 电机与控制学报, 2022, 26(8): 30-39.
Jia Lei, Liu Ruifang, Wang Qinqin.Analytical calculation of stray capacitance of motor end in bearing current problem of induction motor driven by frequency convertor[J]. Electric Machines and Control, 2022, 26(8): 30-39.
[15] Maki K, Funato H, Shao Liang.Motor modeling for EMC simulation by 3-D electromagnetic field analysis[C]//2009 IEEE International Electric Machines and Drives Conference, Miami, FL, USA, 2009: 103-108.
[16] 汪泉弟, 张飞, 彭河蒙, 等. 基于向量拟合法的永磁同步电机EMI高频模型[J]. 电工技术学报, 2015, 30(6): 77-84.
Wang Quandi, Zhang Fei, Peng Hemeng, et al.Permanent magnet synchronous AC motor EMI model based on vector-fitting[J]. Transactions of China Electrotechnical Society, 2015, 30(6): 77-84.
[17] 赵丹, 申科, 刘卫国, 等. 基于二端口理论的航空三级式起动/发电机宽频阻抗模型研究[J]. 中国电机工程学报, 2021, 41(22): 7841-7850.
Zhao Dan, Shen Ke, Liu Weiguo, et al.Two-port theory based wide frequency impedance modeling method for aircraft three-stage starter/generator[J]. Proceedings of the CSEE, 2021, 41(22): 7841-7850.
[18] Magdun O, Binder A.High-frequency induction machine modeling for common mode current and bearing voltage calculation[J]. IEEE Transactions on Industry Applications, 2014, 50(3): 1780-1790.
[19] Magdun O, Binder A.The high-frequency induction machine parameters and their influence on the common mode stator ground current[C]//2012 XX th International Conference on Electrical Machines, Marseille, France, 2012: 505-511.
[20] 赵秦聪, 杨二乐, 刘瑞芳, 等. 一种变频供电感应电机高频轴电流建模方法[J]. 中国电机工程学报, 2021, 41(23): 8139-8148.
Zhao Qincong, Yang Erle, Liu Ruifang, et al.Modeling of high frequency bearing currents of induction motors powered by frequency converters[J]. Proceedings of the CSEE, 2021, 41(23): 8139-8148.
[21] 王禹, 白保东, 刘威峰, 等. 分布参数共模等效电路关键参数确定及轴承电流计算[J]. 电工技术学报, 2014, 29(增刊1): 124-131.
Wang Yu, Bai Baodong, Liu Weifeng, et al.Deter- mination of key parameters in distribution parameters common mode equivalent circuit and calculation of the bearing currents[J]. Transactions of China Electro- technical Society, 2014, 29(S1): 124-131.