Shaft Voltage Elimination Method to Reduce Bearing Faults in Dual Three-Phase Motor

Im, Jun-Hyuk; Kang, Jun-Kyu; Lee, Yeol-Kyeong; Hur, Jin

doi:10.1109/access.2022.3195041

Cited by 9 publications

(4 citation statements)

References 33 publications

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“…When the inverter usually works, the output side of the inverter will inevitably make CMV, which will generate a large shaft current on the motor shaft, destroy the insulation performance of the motor, and reduce the service life of the motor [14], [15], [16]. Therefore, it is necessary to suppress the CMV amplitude.…”

Section: Introductionmentioning

confidence: 99%

Improved Synchronous Space Vector Pulse Width Modulation Strategy for Three-Level With Common-Mode Voltage Suppression

Chen,

Sun,

Zhao

et al. 2024

IEEE Access

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In addressing the issue of high common-mode voltage amplitude and output waveform distortion caused by low switching frequency in medium and high-voltage high-power variable frequency speed control systems, the neutral-point clamped three-level inverter is taken as the research object, from the perspective of switching sequence design, a detailed analysis of the switching sequence design method to mitigate the common-mode voltage amplitude, minimize the switching times and enhance output waveform quality. An improved synchronous space vector pulse width modulation strategy is proposed. Secondly, the improved strategy is applied to the closed-loop control of permanent magnet synchronous motor. Aiming at the defects of single modulation mode, the multi-mode modulation strategy based on the improved strategy is proposed, and the smooth switching of modulation mode is realized by limiting the switching phase. The compensation schemes for angular deviation under synchronous modulation and angular delay under digital control are studied to improve the system's stability. Finally, a simulation and experimental platform is built to verify the correctness and effectiveness of the improved and multi-mode modulation strategies.INDEX TERMS common-mode voltage, closed-loop control, multi-mode modulation, permanent magnet synchronous motor, space vector pulse width modulation, three-level inverter

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Section: Introductionmentioning

confidence: 99%

Improved Synchronous Space Vector Pulse Width Modulation Strategy for Three-Level With Common-Mode Voltage Suppression

Chen,

Sun,

Zhao

et al. 2024

IEEE Access

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“…This proportion is gradually increasing with the higher levels of power semiconductor devices and switching frequency [3]. Several factors can contribute to bearing failure, but the most significant one is bearing voltage [4][5][6]. The reason is the highfrequency common mode voltage produced by pulse-width modulation converter.…”

Section: Introductionmentioning

confidence: 99%

“…However, the method is suspected to be used in practical engineering. This paper proposed an improved algorithm for reducing bearing voltage in a dual three‐phase inverter system, but computational burden is heavy for the controller [6]. The author analysed the flow path of bearing current in motor and posed correspondingly a suppression method by adopting insulating coating between frame and bearing.…”

Section: Introductionmentioning

confidence: 99%

Modelling and suppression of bearing voltage of wind turbine permanent magnet synchronous generators

Jia,

Liu,

et al. 2023

IET Electric Power Appl

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The problem of bearing current is common in wind power generation system, which leads to the attenuation of generator life and great economic losses. Bearing voltage of a 5.5 MW wind‐turbine permanent magnet synchronous generator is studied. The bearing voltage equivalent circuit is modelled by studying the internal system structure of the generator, and an extraction method of cable parameters, generator winding parameters and stray capacitance parameters based on experiments is proposed to simulate the system. A system test platform is built to test the common mode voltage, common mode current and bearing voltage, and the test results are compared with the simulation results in time domain and frequency domain. The result indicate that the common mode equivalent model can accurately simulate the actual bearing voltage. Finally, rotor flange insulation is adopted to suppress bearing voltage. The relationship between the design of rotor flange insulation with suppressing effect is discussed. Finally, an optimisation design method is presented for the proposed suppression scheme.

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“…A circulating flux will then be produced in the frame, leading to a high-frequency inductive circulating bearing current [9,10]. Moreover, there are additional types of bearing currents, such as electric discharge machining (EDM) bearing currents or high-frequency capacitively bearing current [11,12]. EDM current is generated when the voltage across one of the bearings exceeds a threshold and a breakdown happens [13].…”

Section: Introductionmentioning

confidence: 99%

Bearing Current and Shaft Voltage in Electrical Machines: A Comprehensive Research Review

2023

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The reliability assessment of electric machines plays a very critical role in today’s engineering world. The reliability assessment requires a good understanding of electric motors and their root causes. Electric machines mostly fail due to mechanical problems and bearing damage is the main source of this. The bearings can be damaged by mechanical, electrical, and thermal stresses. Among all stresses, the researcher should give special attention to the electrical one, which is bearing current and shaft voltage. This review paper introduces a comprehensive study of bearing current and shaft voltage for inverter-fed electric machines. This study aims to discuss several motor failure processes, as well as the sources and definitions of bearing current and shaft voltage. The different kinds of bearing currents are addressed and the parasitic capacitances, which are the key component to describe bearing current, are determined. Several measurement approaches of bearing current will be discussed. Furthermore, modeling of bearing current will be covered together with the machine’s parasitic capacitances. Moreover, the different bearing current mitigation techniques, as described in many papers, will be thoroughly addressed. The use of rewound multiphase machines for mitigation of bearing current will be proposed and compared to a three-phase machine. Finally, various pulse width modulation techniques of multiphase systems that reduce bearing current and shaft voltage will be investigated, and the findings described in the literature will be summarized for all techniques.

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Shaft Voltage Elimination Method to Reduce Bearing Faults in Dual Three-Phase Motor

Cited by 9 publications

References 33 publications

Improved Synchronous Space Vector Pulse Width Modulation Strategy for Three-Level With Common-Mode Voltage Suppression

Improved Synchronous Space Vector Pulse Width Modulation Strategy for Three-Level With Common-Mode Voltage Suppression

Modelling and suppression of bearing voltage of wind turbine permanent magnet synchronous generators

Bearing Current and Shaft Voltage in Electrical Machines: A Comprehensive Research Review

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