Results 251 to 260 of about 206,251 (288)

Experimental Investigation of Bearing Currents in Low Voltage Motors

2018 XIII International Conference on Electrical Machines (ICEM), 2018
This paper deals with bearing currents phenomena in general and specifically for capacitive bearing currents in low voltage motors. With the technological advances in the automation field, new problems have also surfaced and bearing currents in small motors is one of such issues.
Kashif Khan, Freddy Gyllensten
openaire   +1 more source

An overview of shaft voltages and bearing currents in rotating machines

2016 IEEE Industry Applications Society Annual Meeting, 2016
Shaft voltages and associated "shaft currents" or "bearing currents" have been known since more than a century on DC and AC motors under classical line operation. More recently with the emergence of inverter drives, there has been an increase of high-frequencies bearing currents and shaft voltages creating mainly premature failure of bearings. Although
Plazenet, Thibaud, Boileau, Thierry, Caironi, Cyrille, Nahid-Mobarakeh, Babak   +3 more
openaire   +2 more sources

Measuring of electrical currents, voltage and resistance of an axial bearing

2021 International Aegean Conference on Electrical Machines and Power Electronics (ACEMP) & 2021 International Conference on Optimization of Electrical and Electronic Equipment (OPTIM), 2021
Bearing currents induced in electrical motors driven with fast switching power electronic inverters lead to bearing surface damages on the raceway. This may be the case especially when the rotor is electrically connected to the earth potential of the system e.g. via the cogging wheels of a coupled gear.
Omid Safdarzadeh, Martin Weicker, Andreas Binder   +2 more
openaire   +1 more source

A complete excitation-shaft-bearing model to overcome the shaft induced voltage and bearing current

2011 2nd Power Electronics, Drive Systems and Technologies Conference, 2011
This paper proposes a complete distributed model for investigating the induced shaft voltage and bearing current in turbo generators due to the interaction with the static excitation systems. This undesirable voltage affects the insulations gradually, lowering the life expectancy of the whole system.
Reza Kazemi Golkhandan, Mohammad Tavakoli Bina, Masoud Aliakbar Golkar, Mohsen Jokar   +3 more
openaire   +1 more source

Modeling, simulation and analysis of common mode voltage, bearing voltage and bearing current in PWM multilevel inverter fed induction motor with long cable

2017 2nd IEEE International Conference on Recent Trends in Electronics, Information & Communication Technology (RTEICT), 2017
Adjustable Speed Drives (ASDs) are extensively used in industrial Heating, Ventilation and Air Conditioning (HVAC) equipments. As they offers several advantages in control and energy efficiency. The ASDs use PWM inverter with high speed switching devices such as IGBTs generates the common mode voltage (V cm ). This V cm causes the bearing voltage (V b
P.M Sunitha, Basavaraja Banakara, Sharana Reddy   +2 more
openaire   +1 more source

Adaptive sliding-mode based voltage-controlled active magnetic bearing system

IECON'03. 29th Annual Conference of the IEEE Industrial Electronics Society (IEEE Cat. No.03CH37468), 2004
This paper deals with the control problem for an active magnetic bearing system. An adaptive sliding mode control algorithm which does not need the knowledge of system parameters is presented. Besides the controller can tolerate high-speed rotational disturbance without performance degradation.
null Jung-Hua Yang, null Chyuan-Yow Tseng   +1 more
openaire   +1 more source

Motor shaft voltages and bearing currents and their reduction in multilevel medium-voltage PWM voltage-source-inverter drive applications

IEEE Transactions on Industry Applications, 2000
This paper presents test results on problems and solutions of motor shaft voltages and bearing currents in medium-voltage pulsewidth modulated (PWM) drive systems. Tests show that multilevel medium-voltage PWM voltage-source inverter drives can cause motor bearing currents, similar to a low-voltage PWM drives, even with one motor bearing insulated ...
openaire   +1 more source

Feedback linearization of an active magnetic bearing with voltage control

IEEE Transactions on Control Systems Technology, 2002
A feedback linearization controller is presented for a single-degree-of-freedom (DOF) magnetic bearing test rig. The feedback linearization controller is derived from a detailed nonlinear electromagnet model using both analytic relationships and experimental calibration data.
J.D. Lindlau, C.R. Knospe
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Calculation of bearing and common-mode voltages for the prediction of bearing failures caused by EDM currents

8th IEEE Symposium on Diagnostics for Electrical Machines, Power Electronics & Drives, 2011
The paper deals with the calculation of the common-mode (CM) voltage and the electrostatic induced voltage across the bearings in the small power inverter-fed AC machines with wound round wire windings. A method for the calculation of the bearing voltage directly from the CM voltage at the neutral point has been previously proposed in the literature ...
Oliver Magdun, Yves Gemeinder, Andreas Binder, Kersten Reis   +3 more
openaire   +1 more source

Suppressing Bearing Voltage in an Inverter-Fed Ungrounded Brushless DC Motor

IEEE Transactions on Industrial Electronics, 2013
This paper describes the bearing voltage reduction achieved by the brushless dc motor for air conditioning driven by the voltage source inverter. First, the simplified equivalent circuit of the brushless dc motor is derived based on the common-mode equivalent circuit where stray capacitance is taken into account.
Tatsuo Maetani, Yoshinori Isomura, Akihiko Watanabe, Kenichi Iimori, Shigeo Morimoto   +4 more
openaire   +1 more source