Electromagnetic fields generated by arbitrarily shaped current loops

Griffith, James M.; Pan, George

doi:10.1049/iet-smt.2011.0216

Cited by 2 publications

(1 citation statement)

References 14 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The eddy-current magnetic flux density can be obtained according to Equations (11), i.e., the Boit–Savart–Laplace law [17,18]:dBeddy=μ0Iunit4πnormalditaliclfalse˜unit×italicDfalse˜italic0italicunitDunit2 where Iunit is the unit-element current; dtruel˜unit—unit length of unit-element current; Dunit—distance between unit-element current and the checkpoint; trueD˜0unit—unit vector from unit-element current to the checkpoint; dBeddy—unit magnetic field that unit-element current generated on the watch point.…”

Section: Anisotropic Surface Conductivity Of the Rotormentioning

confidence: 99%

Theoretical and Experimental Analysis on the Influence of Rotor Non-Mechanical Errors of the Inductive Transducer in Active Magnetic Bearings

Zhou

et al. 2018

Sensors

View full text Add to dashboard Cite

Inductive transducers are widely applied to active magnetic bearings (AMBs). However, when the rotor rotates at a high speed, the rotor defects will affect the measuring signal (the magnetic field generated by transducer coils) and then reduce the transducer measuring accuracy. The rotor in AMBs is assembled with laminations, which will result in rotor non-mechanical errors. In this paper, rotor non-mechanical errors, including the anisotropic internal permeability and anisotropic surface conductivity, and their influence on double-pole variable-gap inductive transducers are explored in depth. The anisotropic internal permeability will affect the transducer measuring accuracy and bring about 1.3±0.1% measurement error. The anisotropic surface conductivity leads to different eddy currents around the rotor, influences the equivalent reluctance of the magnetic circuit, and then affectsthe transducer measuring accuracy. The experiments prove that rotor non-mechanical errors have a significant influence on transducer measurement accuracy, and the reduction of the transducer excitation frequency can reduce the measurement error and improve the AMB control performance.

show abstract

Section: Anisotropic Surface Conductivity Of the Rotormentioning

confidence: 99%

Theoretical and Experimental Analysis on the Influence of Rotor Non-Mechanical Errors of the Inductive Transducer in Active Magnetic Bearings

Zhou

et al. 2018

Sensors

View full text Add to dashboard Cite

show abstract

RF shield parallel-plate waveguide for travelling-wave MRI experiments at 3 T

Marrufo¹,

Vázquez

Martin

et al. 2019

J. Phys.: Conf. Ser.

View full text Add to dashboard Cite

Ultra high field magnetic resonance imaging systems suffer from the standing wave problems produced by conventional radiofrequency coils. This causes inhomogeneous fields degrading the image quality. To overcome this problems, propagation of RF waves by antennas inside a waveguide is suggested. We assessed the feasibility of using the magnet RF shield with aluminium strips to form a parallel-plate waveguide for travelling-wave magnetic resonance imaging at 3 T. Imaging results showed that a number of constraints must be solved before good image quality can be obtained. A brief discussion is presented on the possible sources or error and interference. Despite these limitations, results are really encouraging to continue investigating the implementation of this approach.

show abstract

Electromagnetic fields generated by arbitrarily shaped current loops

Cited by 2 publications

References 14 publications

Theoretical and Experimental Analysis on the Influence of Rotor Non-Mechanical Errors of the Inductive Transducer in Active Magnetic Bearings

Theoretical and Experimental Analysis on the Influence of Rotor Non-Mechanical Errors of the Inductive Transducer in Active Magnetic Bearings

RF shield parallel-plate waveguide for travelling-wave MRI experiments at 3 T

Contact Info

Product

Resources

About