Experimental validation of the circulating-bearing-currents mathematical theory in the 20 MHz frequency range

Postariu, Dragos; Chillet, Christian; Roudet, James; Boualem, Benali; Périot, Robert

doi:10.1109/electromotion.2009.5259081

Cited by 4 publications

(2 citation statements)

References 3 publications

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“…For very low currents, the iron core characteristics are at the beginning of their magnetization curves [33]. Consequently, the stator yoke may have a lower or higher permeability than the normal operating state.…”

Section: Calculation Of CM Currentmentioning

confidence: 99%

High-Frequency Induction Machine Modeling for Common Mode Current and Bearing Voltage Calculation

Magdun

Binder

2014

IEEE Trans. on Ind. Applicat.

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In this paper, several inverter-fed induction machines with rated powers between 1.5 and 240 kW are modeled for calculating the common mode (CM) stator ground current and the capacitive bearing voltage. Simple methods to extract the parameters of the high-frequency machine model from the measured CM and differential mode impedances are presented. Furthermore, the most significant parameters are given for five different machine sizes between 1.5 and 240 kW rated power. Calculation examples are provided in comparison to the experimental results.

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Section: Calculation Of CM Currentmentioning

confidence: 99%

High-Frequency Induction Machine Modeling for Common Mode Current and Bearing Voltage Calculation

Magdun

Binder

2014

IEEE Trans. on Ind. Applicat.

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“…The leakage current in the motor and the axial flux generated by the unbalanced flux cause a voltage at the motor shaft, forming a high-frequency circulating current that causes damage to the bearings at both ends of the motor [117], as shown in Figure 13. Muetze et al [116] and Postariu et al [119] proposed an eddy-current model for the circulating bearing current based on the circulation loop of circulating bearing currents. Magdun et al [120,143] also consider the motor rotor impedance in the circulating bearing current model.…”

Section: Circulating Current Modelmentioning

confidence: 99%

Motor Bearing Damage Induced by Bearing Current: A Review

Xue

Han

et al. 2022

Machines

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The occurrence of the motor shaft voltage and bearing current caused by the inverter will aggravate bearing damage and lead to the premature failure of bearings. Many types of equipment are being shut down due to bearing currents, such as filters, insulated bearings and grounding brushes. Traditional suppression measures cannot eliminate the bearing current and the bearing damage mechanism under the bearing current is not clear. In this paper, the damage caused by the bearing current to bearings is analyzed in detail. The influences of different working conditions on the bearing current and the damage caused are discussed. The source of bearing currents is introduced and the bearing current model under different working conditions is reviewed. An outlook for future studies is proposed, based on the current research status and challenges.

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Rotor impedance of the high frequency circulating bearing current path in inverter-fed AC machines

Magdun¹,

Gemeinder²,

Binder³

2013

2013 IEEE Energy Conversion Congress and Exposition

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The circulating bearing current depends on the common mode stator ground current and the stator laminated core impedance, but also on the bearing impedances and on the rotor impedance of the circulating bearing current path. In the literature, the rotor impedance was neglected, or it was considered as a small air gap and end-winding cavity inductance. It is shown here by calculation and measurement that the rotor impedance is not negligible, and it is much larger than the air gap and end-winding cavity inductance. Moreover, it is shown that the circulating bearing currents can be mitigated, if the rotor impedance is increased by at least ten times the stator impedance. For increasing the rotor impedance, nanocrystalline magnetic materials are added on the machine shaft. The circulating bearing currents are measured for a standard 110 kW machine and for the same machine with the increased rotor impedance.

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Experimental validation of the circulating-bearing-currents mathematical theory in the 20 MHz frequency range

Cited by 4 publications

References 3 publications

High-Frequency Induction Machine Modeling for Common Mode Current and Bearing Voltage Calculation

High-Frequency Induction Machine Modeling for Common Mode Current and Bearing Voltage Calculation

Motor Bearing Damage Induced by Bearing Current: A Review

Rotor impedance of the high frequency circulating bearing current path in inverter-fed AC machines

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