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Location: Lake Geneva, Wisconsin
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Magnetic Brakes Losing Effectivness.

11/11/2010 3:17 PM

I have an application where we are using magnetic brakes to hold spools of wire. The wire is then would around a mandrel to make coils. The brakes areter so long seem to loose there effectiveness (can't think of another way to put it) and need to be adjusted to get the same results. Our brakes have a % mark on the side and we can start out at 25% lets say and it could be a couple years and we need to change them to maybe 30-40% to get the same amount of drag desired. To fix this we basically take a power drill hook it up to the brake shaft and spin it at a high RPM for a bit and it seems to build the magnets back to full strength.

Here is the website of the brakes and we are using model number 527-016.

http://www.magnetictech.com

Three things:

Can someone possible explain to be what is happening?

Is there a way to hook these up to a torsion tester or something where you would turn the motor on to a certain speed and you can turn the brake dial until you get the desired drag you are looking for?

Also is there a better way to fix these brakes by re-tunning them?

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#1

Re: Magnetic Brakes Losing Effectivness.

11/11/2010 11:01 PM

The best person to ask is them. This can hardly be a new problem.

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Guru
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#2

Re: Magnetic Brakes Losing Effectivness.

11/12/2010 9:03 AM

Sounds like you are getting surface contact contamination, varnish type of build up over a long period of time. Spinning them at high speed cleans the surface up again. It could not be an electrical problem.

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#3

Re: Magnetic Brakes Losing Effectivness.

11/12/2010 9:09 AM

The link you provided shows that the manufacturer offers spare parts and consultation.

These are permanent magnet based devices and subject to degradation.

You could test them with a simple torque arm and spring scale arraignment.

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Join Date: May 2010
Location: Fairfield, Ohio USA
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#4

Re: Magnetic Brakes Losing Effectivness.

11/12/2010 9:18 AM

You need to look into changing out the brakes to Magnashear Brakes, they require no adjustments ever. Check out the web site www.forcecontrol.com

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#5

Re: Magnetic Brakes Losing Effectivness.

11/16/2010 3:52 AM

Software tool to design your system and engineering services (trainning, expertise, study, optimisation ...) can be found on www.cedrat.com

best regards,

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