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Eddy Current Brake Test

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Published on Mar 1, 2011

Comments • 11

Raul Martinez
Look at the other video I posted. That was our final finished project. Between the brake plates are 50 small neodymium magnets set up in a north south coordination.
Raul Martinez
Hello, yes our initial idea was to use electromagnetism but it turns out electromagnets have a magnetic field that does not stretch too far out from the source. What creates the eddy current is a magnetic field that is able to reach out into the aluminum disk. We figured this early on in our project so we had to switch to permanent magnets. Ultimately the strongest magnets available are neodymium magnets. They work great and can be even dangerous.
Edger Dominique
ive done a similar project n it doesn't work ! :( :( ive used an aluminium disc of dia 370mm and 8 mm thickness and electromagnets powered by a 24 volt, 1.3 amps battery.. pls help ! its kinda urgent ! 
Smeatfree
OOOPs I should have said a voltage ensues, a current will ensue if there is a connected path for the current to flow, hence the reason the slots will interfere if they cut the path :D
Smeatfree
Basic electromechanics, move a conductor in a magnetic field and a current ensues. Copper and aluminium have low resistances so the electric current generated is high. The current developed causes a back emf (retarding force) as all generators do so slowing the device. Steel has higher resistance so the current is lower. Cutting slots in the disc interfers with the currents and (depending on the direction of the slots) eliminates the braking effect.
Ruturaj Zadbuke
I guess a Horse Shoe Magnet would be far more effective, is it so?
JPMorganMustDie
Copper Disk You want the Magnetic field to induce a current in disk, the current creates a Megnetic Field opposing the Magnets. The Copper Disk will get RED HOT. Copper is a better Electrical Conductor.
Raul Martinez
@ciockyvisa No actually, the steel will react with the magnetic field and the magnet will try to attach itself to the steel. in order for eddy currents to be made the material must be non ferromagnetic much like aluminum or copper. If you want a faster brake time then the thickness of the material must be increased as well as the diameter of the disk. In fact ill upload a prototype friends and i made for our senior design project. i think you will like it. keep your eye open for it. 
ciocan cristian
hello, nice vid u got, can u tell me if a use a steel disk , does it brake faster?
Apratim Basu
hmm....i had a question in my mind after seeing your video. can the disk from hard disk can also run to create eddy current when the magnet reaches near to it ?i need to know because i am goin to build this brake for my school science project
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