Defining dimensions of a linear eddy current brakes permanent magnets

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SUMMARY

This discussion focuses on designing an eddy current brake system for roller coasters, specifically utilizing NdFeB permanent magnets and copper fins. The key challenge is determining the necessary dimensions of the magnets to achieve the required flux density for effective braking. The conversation highlights the importance of calculating the induced EMF in the copper conductor, using Faraday's law, and understanding the Lorentz force relation to find the current and power dissipated. The design involves multiple lines of magnets to ensure adequate speed reduction.

PREREQUISITES
  • Understanding of Faraday's law of electromagnetic induction
  • Knowledge of Lorentz force relation in electromagnetism
  • Familiarity with NdFeB permanent magnets and their properties
  • Basic principles of eddy current braking systems
NEXT STEPS
  • Research the calculation of flux density in magnetic systems
  • Learn about the design and configuration of eddy current brakes
  • Explore the electrical properties of copper conductors, including resistance
  • Investigate the effects of multiple magnet configurations on braking efficiency
USEFUL FOR

Mechanical engineers, electrical engineers, and designers involved in roller coaster systems or similar applications requiring advanced braking technologies.

os220
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I am designing an eddy current brake system for use in roller coaster design.

I have the flux density required to reduce the speed to what i want it to be. what i need to do from that is work out the dimensions needed to obtain his flux density.

the configuration is for identical magnets facing each other in attracting positions with a cooper fin acting as the ferrinagnetic material and a NdFeB magnet

what formulas do i need to do this

i also have the force need to stop the coaster

ollie
 
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the fin is bolted to the rail?

What you must consider is the EMF induced in the copper conductor, then calculate the current, after which you can find the power dissipated (assuming you know the resistance of the copper fin). To find current use faraday's law, or, if you have a decent imagination, you can use the Lorrentz force relation directly.
 
The fin is bolted to the underside of my cart with the magnets located at the point at which my cart needs to brake

Due to the fact that i have no electrical current running through the magnets (the are permanent magnets) how do i calculate the necessary set up to reduce the carts speed.

I know that eddy current magnets only reduce the speed proportionally and i will therefore need several lines of magnets
 

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