Results 1 to 10 of about 50,617 (147)

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

Machines, 2023
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.
Kotb B. Tawfiq, Mehmet Güleç, Peter Sergeant   +2 more
doaj   +3 more sources

Multiphysics-Coupled Load-Bearing Capacity of Piezoelectric Stacks in Low-Temperature Environments [PDF]

Sensors
Under low-temperature conditions, the load-bearing capacity of piezoelectric stacks arises from coupled thermo-electro-mechanical interactions, with temperature fluctuations, compressive prestress, and excitation voltage critically modulating performance.
Yang Li, Yongping Zheng, Leipeng Song, Zhefan Yao, Hui Zhang, Yonglin Wang, Zhengshun Fei, Xiaozhou Xu, Xinjian Xiang   +8 more
doaj   +2 more sources

Analysis of Traction Motor Bearing Voltage and Bearing Current Considering Whole-train Grounding and Suppression Measures

Chengshi guidao jiaotong yanjiu
Objective Most urban rail transit trains use PWM (pulse width modulation) variable frequency drive system, which often leads to bearing corrosion problems due to the excessive bearing voltage and bearing current during operation.
CHEN Zhi, ZHAO Wenjuan, YANG Xiangyan, CHEN Zhiwen, YANG Shaobing, SONG Kejian   +5 more
doaj   +2 more sources

Electrostatic discharge impacts on the main shaft bearings of wind turbines [PDF]

Wind Energy Science, 2023
This paper studies the electrostatic discharge effect in wind turbines, a possible trigger source of the main bearing current. A lab setup with a charge generator and downsized wind turbine was built to verify the impact of electrostatic discharge on the
J. Zhao, X. Xu, O. Carlson
doaj   +1 more source

Influencing Factors on the Fluting in an Axial Ball Bearing at DC Bearing Currents

Lubricants, 2023
The effect of variable DC bearing current amplitude, bearing current polarity, mechanical force, rotation speed, bearing temperature, and number of the balls on the fluting in an axial ball bearing type 51208 is investigated under DC currents.
Omid Safdarzadeh, Resat Capan, Michel Werner, Andreas Binder, Oliver Koch   +4 more
doaj   +1 more source

Analysis of Impact of Design Solutions of an Electric Machine with Permanent Magnets for Bearing Voltages with Inverter Power Supply

Energies, 2022
The aim of the article is to present a new idea of limiting the bearing voltage in electric machines with permanent magnets through the use of a shielding winding placed in stator slot wedges.
Sebastian Berhausen, Tomasz Jarek
doaj   +1 more source

The effect of end windings and the bearing labyrinth seals on stray capacitances and bearing voltage ratio of AC motors

IET Electric Power Applications, 2022
The bearing voltage brings premature failure of the motor bearings in the subway traction system, which is related to the stray capacitance of the motor.
Ruifang Liu, Qinqin Wang, Danan Sun, Xiaoji Huai   +3 more
doaj   +1 more source

Suppression of Rotor-Grounding Bearing Currents Based on Matching Stator and Rotor Grounding Impedances

Energies, 2022
Pulse-width modulation (PWM) inverter drive systems are widely applied in industry for their great speed-control characteristics and performance. However, the common-mode voltage of the inverter induces motor bearing voltage and bearing current, which ...
Lei Yang, Ying Yang, Junfu Wen, Lei Jia, Erle Yang, Ruifang Liu   +5 more
doaj   +1 more source

Novel Characterization of Si- and SiC-Based PWM Inverter Bearing Currents Using Probability Density Functions

Energies, 2022
The high frequency PWM voltage pulses from a two-level six-switch inverter produce a common-mode voltage in an electric machine’s windings, a fraction of which appears on the machine shaft due to electrostatic (capacitive) coupling.
Ryan Collin, Alex Yokochi, Annette von Jouanne   +2 more
doaj   +1 more source

Shaft Voltage Reduction Method Using Carrier Wave Phase Shift in IPMSM

Energies, 2021
Common-Mode Voltage (CMV) induces shaft voltage and bearing current due to the electrical interaction with the parasitic capacitance of the motor. CMV, shaft voltage, and bearing current are considered the major causes of bearing fault.
Jun-Hyuk Im, Yeol-Kyeong Lee, Jun-Kyu Park, Jin Hur   +3 more
doaj   +1 more source