Results 261 to 270 of about 206,251 (288)
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[Antitumor effect of low-voltage electric pulses on melanoma-bearing mice].
Xi bao yu fen zi mian yi xue za zhi = Chinese journal of cellular and molecular immunology, 2015To investigate the antitumor effect of the low-voltage electric pulses (LVEPs) on melanoma-bearing mice.Tumor models were established by subcutaneously inoculating BALB/c mice with B16F10 melanoma cells. These mice were randomly divided into control group and treated groups which were exposed to electric pulses of different frequency 10, 20, 30 Hz for ...
Xiaoxu, Wang +3 more
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Study of shaft voltage & bearing currents in electrical machines
2012 IEEE Students' Conference on Electrical, Electronics and Computer Science, 2012Shaft voltage & bearing currents in electric motors are not new. Its presence is noticed probably after the invention of electric rotating machines which is confirmed by observing pitting in the bearing rubbing surfaces and changing the chemical composition of lubricating oil or grease used in the bearings.
Arun Kumar Datta +2 more
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2012 IEEE Vehicle Power and Propulsion Conference, 2012
In this paper, we propose a method to suppress shaft voltage by changing the shape of the permanent magnets in the Interior Permanent Magnet (IPM)-type high voltage motors. The shaft voltage, which is induced by parasitic components and leakage flux in the motor driven system, adversely affects their bearings. For minimizing the shaft voltage, a magnet
null Sang-Hoon Cha +3 more
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In this paper, we propose a method to suppress shaft voltage by changing the shape of the permanent magnets in the Interior Permanent Magnet (IPM)-type high voltage motors. The shaft voltage, which is induced by parasitic components and leakage flux in the motor driven system, adversely affects their bearings. For minimizing the shaft voltage, a magnet
null Sang-Hoon Cha +3 more
openaire +1 more source
2015 International Conference on Power and Advanced Control Engineering (ICPACE), 2015
A Pulse Width Modulation (PWM) Voltage Source Inverter (VSI) fed induction motor drive has superior dynamic characteristics than sine wave driven induction motor. But it has a problem with induced bearing voltage and high frequency bearing current that flows through bearings due to parasitic capacitive coupling that results in premature bearing failure.
Sharana Reddy, B. Basavaraja
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A Pulse Width Modulation (PWM) Voltage Source Inverter (VSI) fed induction motor drive has superior dynamic characteristics than sine wave driven induction motor. But it has a problem with induced bearing voltage and high frequency bearing current that flows through bearings due to parasitic capacitive coupling that results in premature bearing failure.
Sharana Reddy, B. Basavaraja
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IEEE Transactions on Control Systems Technology, 2003
We consider the exact linearization of a standard, single-axis, active magnetic bearing actuator in voltage control configuration. The actuator is modeled using the magnetic circuit law, with edge effect, flux leakage, and permeability nonlinearity omitted.
Lichuan Li +2 more
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We consider the exact linearization of a standard, single-axis, active magnetic bearing actuator in voltage control configuration. The actuator is modeled using the magnetic circuit law, with edge effect, flux leakage, and permeability nonlinearity omitted.
Lichuan Li +2 more
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A Comprehensive Study on Shaft Voltages and Bearing Currents in Rotating Machines
IEEE Transactions on Industry Applications, 2018This paper puts into perspective the state-of-the art knowledge on bearing currents and diagnosis tools, which rely on shaft voltages and bearing currents phenomena. Today, shaft signals measurements are progressively included in predictive health monitoring of large turbo and hydro generators. In addition, bearing fault diagnosis through shaft signals
Thibaud Plazenet +3 more
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Effect of PWM inverters on AC motor bearing currents and shaft voltages
IEEE Transactions on Industry Applications, 1995This paper investigates AC induction motor shaft voltage problems, current flow through motor bearings and electric discharge current problems within bearings when operated under both pure sinewave and pulse width modulated (PWM) inverter sources. Experience suggests that PWM voltage sources with steep wavefronts especially increase the magnitude of ...
J. Erdman +3 more
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Optimal control of a magnetic bearing without bias flux using finite voltage
Optimal Control Applications and Methods, 1998Conventional active magnetic bearings (AMB) are operated using a bias current (or flux) to achieve greater linearity and dynamic capability. Bias, however, results in undesirable rotating losses and consequent rotor heating. While control without bias flux is an attractive alternative, it is considerably more complex due to both force slew rate ...
Charles Yang +2 more
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Breakdown voltages in thrust bearings: Behavior and Measurement
Tribology Transactions, 2023Simon Graf +4 more
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Common mode voltage impact on wind turbine main shaft bearing
2021 23rd European Conference on Power Electronics and Applications (EPE'21 ECCE Europe), 2021Jian Zhao, Xiangdong Xu, Ola Carlson
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