Asking a question about eddy currents

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SUMMARY

The discussion centers on the duration of eddy currents in relation to switching magnetic fields in a metal vacuum chamber. The user seeks clarity on whether the duration of eddy currents is solely dependent on switching time or if it can be calculated independently. A key insight provided is the importance of the time constant, tau, which is influenced by the geometry of the coil and conductor, as well as the conductivity and permeability of the material. Understanding tau is crucial for determining the impact of eddy currents on experimental outcomes.

PREREQUISITES
  • Understanding of eddy currents and their properties
  • Familiarity with the concept of time constant (tau)
  • Knowledge of magnetic field switching mechanisms
  • Basic principles of electromagnetism
NEXT STEPS
  • Research the calculation of the time constant (tau) for different geometries
  • Explore the effects of conductivity and permeability on eddy currents
  • Study the relationship between magnetic field duration and eddy current behavior
  • Investigate experimental setups for measuring eddy currents in vacuum environments
USEFUL FOR

Physicists, electrical engineers, and researchers involved in experiments with magnetic fields and eddy currents will benefit from this discussion.

Di Chang
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Hi All,

I am new to this forum. Thanks for viewing my question in advance.
I have a confusion about the duration of eddy current. All the formulae I found are to calculate the intensity of the current. I am implementing a switch in my experiment which will turn on/off the magnetic field inside a metal vacuum chamber for a few ms, let's sat, on for 8ms and off for 2ms, and I am wondering in this case, the duration of the eddy current will totally depend on the switching time or there is a way to calculate the shortest duration time the eddy current has to take for a single loop the electrons have to run for.

Thanks a lot!
Di
 
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I don't think you understand how eddy currents operate. They are characterized by a time constant tau that is determined by the geometry of coil and conductor and by the latter's conductivity and permeability. Once you know tau you can decide if it's a problem for your experiment.
 

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