Inverter-Induced Bearing Currents: A Thorough Study of the Cause-and-Effect Chains

Êvo, Marco Túlio Alves; Alzamora, Andre M.; Zaparoli, Isabela Oliveira; Paula, Hélder de

doi:10.1109/mias.2022.3214026

Cited by 5 publications

(4 citation statements)

References 60 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The equivalent capacitance of slot wedge and slot insulation (𝐶 ) can be calculated from (8). The stator winding to rotor capacitance (𝐶 ) is given by (9). In (8), 𝑏 and ℎ represent the slot opening width and height, respectively.…”

Section: 𝐶 = 𝜀 𝑙 𝜋 𝑑 𝑘 𝛿 (6)mentioning

confidence: 99%

“…In (8), 𝑏 and ℎ represent the slot opening width and height, respectively. In (9), ℎ represents the thickness of the slot insulation and the slot wedge.…”

Section: 𝐶 = 𝜀 𝑙 𝜋 𝑑 𝑘 𝛿 (6)mentioning

confidence: 99%

“…The generated high-frequency common mode current due to PWM flows through the winding of the machine and then to the stator of the machine. 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].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

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

2023

View full text Add to dashboard Cite

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.

show abstract

Section: 𝐶 = 𝜀 𝑙 𝜋 𝑑 𝑘 𝛿 (6)mentioning

confidence: 99%

“…In (8), 𝑏 and ℎ represent the slot opening width and height, respectively. In (9), ℎ represents the thickness of the slot insulation and the slot wedge.…”

Section: 𝐶 = 𝜀 𝑙 𝜋 𝑑 𝑘 𝛿 (6)mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

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

2023

View full text Add to dashboard Cite

show abstract

“…According to relevant statistics, the proportion of bearing failures in wind turbine failures is about 60%-70% [3], of which about 9% is caused by bearing current [4], and this proportion is gradually expanding with the increase of power semiconductor device voltage level and switching frequency [5,6]. The bearing currents caused by the drive of the converter is called high frequency bearing currents [7]. Due to the rapid switching on and off of power semiconductor devices, the inverter's output common-mode (CM) voltage exhibits a high dv/dt (rate of change of voltage with respect to time).…”

Section: Introductionmentioning

confidence: 99%

Modelling of high frequency bearing voltage for dual‐winding permanent magnet synchronous generators

Li,

Liu,

Zhang

et al. 2023

IET Electric Power Appl

View full text Add to dashboard Cite

The modelling and analysis of high‐frequency bearing voltage are of great significance to the assessment and mitigation of the electrical erosion risk in wind power systems. However, the dual‐winding permanent magnet synchronous generator (DW‐PMSG), as one of the mainstream models in wind power industry, has not been specifically analysed for its bearing voltage modelling method in the existing research. The high frequency common mode equivalent circuit model of DW‐PMSG is established, and the effect of parasitic parameters between two sets of winding on bearing voltage is analysed. A model parameters extraction method based on differential evolution algorithm is proposed, and the range of parameters is estimated by finite element simulation and test results, which improves the search efficiency and solution accuracy. The accuracy of the proposed model is verified by the comparison of simulation and experimental results. On this basis, it is possible to conduct more in‐depth research on the bearing voltage and bearing currents of DW‐PMSG, and provide theoretical basis and simulation means for the design of suppression schemes.

show abstract

Comparative Evaluation of Three-Phase Three-Level Flying Capacitor and Stacked Polyphase Bridge GaN Inverter Systems for Integrated Motor Drives

Rohner,

Huber,

Mirić

et al. 2024

Electronics

View full text Add to dashboard Cite

This article presents a comprehensive comparative evaluation of a three-phase Three-Level (3L) Flying Capacitor Converter (FCC) and a spbi, specifically a converter system formed by two Series-Stacked Two-Level three-phase Converters (2L-SSC), for the realization of a 7.5 kW Integrated Motor Drive (IMD) with a high short-term overload capability. The 2L-SSC requires a motor with two three-phase windings and a split DC-link, but uses standard six-switch, two-level transistor configurations. In contrast, the bridge legs of the 3lfcc feature flying capacitors whose voltages must be actively balanced. Despite the 800 V DC-link voltage, both topologies employ the same set of 650 V GaN power transistors, i.e., the same total chip area, and if operated at the same switching frequency, show identical semiconductor losses. edm damage of the motor bearings is a relevant issue caused by the common-mode (CM) voltages of the inverter stage. The high effective switching frequency of the 3lfcc and the possibility of CM voltage canceling in the 2L-SSC facilitate mitigation of edm by means of CM chokes, whereby a substantially smaller CM choke with lower losses suffices for the 2L-SSC; based on exemplary designs, the 2L-SSC features only about 75% of the total volume and 85% of the nominal losses of the 3lfcc. If, alternatively, motor-friendliness is maximized by including DC-referenced sine-wave output filters, the 3lfcc’s higher effective switching frequency and the 2L-SSC’s need for two sets of filters due to the dual-winding-set motor change the outcome. In this case, the 3lfcc features only about 60% of the volume and only about 55% of the 2L-SSC’s nominal losses.

show abstract

Inverter-Induced Bearing Currents: A Thorough Study of the Cause-and-Effect Chains

Cited by 5 publications

References 60 publications

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

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

Modelling of high frequency bearing voltage for dual‐winding permanent magnet synchronous generators

Comparative Evaluation of Three-Phase Three-Level Flying Capacitor and Stacked Polyphase Bridge GaN Inverter Systems for Integrated Motor Drives

Contact Info

Product

Resources

About