Publications associées à Speed and Stability Limits for High-Speed Bearingless Disc Drives

Laser Doppler Vibrometer measurements of the 3D pressure field for the estimation of the radiation force produced by an acoustic standing-wave levitator

Acoustic levitation devices use powerful ultrasonic standing waves to levitate objects in mid-air. We have created a system and method to measure the full harmonic content of the acoustic field accurately. Our study revealed that levitated particles alter ...

Elsevier Science Sa2024

Modelling and Sensors for Magnetically-Levitated Disc Drives

Juan Patricio Tomás Peralta Fierro

The development of new industrial applications has diverted the focus of research towards compacter and faster rotatory drives. These requirements push the classical ball-bearings of electric motors to the limits in terms of operational lifetime and fricti ...

EPFL2022

Principles and Test Result of Novel Full Passive Magnetic Levitation Motor with Diamagnetic Disk

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This paper proposes a novel full passive magnetic levitation motor without active magnetic suspension. It has a magnetic levitation unit and a motor unit. The Halbach array permanent magnets and a pyrolytic graphite (PG) disk realize the full passive magne ...

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Characterization and Verification of Eddy-Current Position Sensing for Magnetic Levitation

Yves Perriard, Sean Thomas, Juan Patricio Tomás Peralta Fierro

Magnetically-levitated drives are compelling in applications where the long-lifetime operation or process chamber encapsulation is a requirement. To exploit these advantages, contactless position sensors are needed to estimate the position of the rotor. Of ...

2021

Controlling the rotation of drift tearing modes by biased electrode in ADITYA-U tokamak

Harshita Raj, Ankit Kumar, Abhijit Sen, Rohit Kumar, Sameer Kumar

The influence of background plasma poloidal rotation on the rotation frequency of the m/n = 2/1 drift tearing mode (DTM) has been studied in ADITYA-U tokamak. The poloidal rotation velocity of the background plasma in the ion diamagnetic direction is incre ...

2021

Experimental verification of X-point potential well formation in unfavorable magnetic field direction

Basil Duval, Holger Reimerdes, Christian Gabriel Theiler, Joaquim Loizu Cisquella, Sophie Danielle Angelica Gorno, Claudia Colandrea, Marco Wischmeier, Cedric Kar-Wai Tsui, Mirko Wensing, Hugo De Oliveira

Recent TCV experiments confirm the predicted formation of an electric potential well, below the magnetic X-point, in configurations with unfavorable

B_t

field direction (ion

\nabla B

drift away from the divertor), that substantially reshapes the typica ...

2020

Design of Compact Bearingless Disc Drive Systems

Yves Perriard, Douglas Martins Araujo, Juan Patricio Tomás Peralta Fierro

Inflating costs and emerging applications are spawning interests toward smaller and faster electric drives. The challenges of miniaturization make magnetic bearings more appealing, as they provide intrinsic high-speed capability and need virtually zero-mai ...

2020

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In the frame of the EUROfusion Work Package Heating and Current Drive (WP HCD) of the Power Plant Physics and Technology (PPPT) program, CVD diamond disk Brewster-angle windows for gyrotron operation at multi-megawatt RF power levels and long pulses are un ...

2020

Magnet-assisted ball drive

Pierre Dillenbourg, Francesco Mondada, Wafa Monia Benkaouar Johal, Séverin Lemaignan, Ayberk Özgür

The present invention concerns a magnet-assisted ball drive. The drive comprises a ball and a drive element in contact with the ball. The drive element is arranged to be rotated around its axis of rotation to drive the ball. The ball and the drive element ...

2019

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Nuclear fusion power plants require electron cyclotron (EC) heating and current drive (H&CD) systems for plasma heating and stabilization. High-power microwave beams between 1 and 2?MW generated by gyrotrons propagate in a dedicated waveguide transmission ...

TAYLOR & FRANCIS INC2019

Speed and Stability Limits for High-Speed Bearingless Disc Drives

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Laser Doppler Vibrometer measurements of the 3D pressure field for the estimation of the radiation force produced by an acoustic standing-wave levitator

Modelling and Sensors for Magnetically-Levitated Disc Drives

Principles and Test Result of Novel Full Passive Magnetic Levitation Motor with Diamagnetic Disk

Characterization and Verification of Eddy-Current Position Sensing for Magnetic Levitation

Controlling the rotation of drift tearing modes by biased electrode in ADITYA-U tokamak

Experimental verification of X-point potential well formation in unfavorable magnetic field direction

Design of Compact Bearingless Disc Drive Systems

Towards large area CVD diamond disks for Brewster-angle windows

Magnet-assisted ball drive

Diamond Window Technology for Electron Cyclotron Heating and Current Drive: State of the Art

Modelling and Sensors for Magnetically-Levitated Disc Drives

Laser Doppler Vibrometer measurements of the 3D pressure field for the estimation of the radiation force produced by an acoustic standing-wave levitator

Towards large area CVD diamond disks for Brewster-angle windows

Experimental verification of X-point potential well formation in unfavorable magnetic field direction

Diamond Window Technology for Electron Cyclotron Heating and Current Drive: State of the Art

Principles and Test Result of Novel Full Passive Magnetic Levitation Motor with Diamagnetic Disk

Design of Compact Bearingless Disc Drive Systems

Characterization and Verification of Eddy-Current Position Sensing for Magnetic Levitation

Controlling the rotation of drift tearing modes by biased electrode in ADITYA-U tokamak

Magnet-assisted ball drive