Permeability of transformator cores. - diyAudio
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Old 18th February 2003, 03:37 PM   #1
Gunders is offline Gunders  Norway
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Default Permeability of transformator cores.

Could somebody help me with this little problem?
I'm just wondering what the permeability of a toroid transformator core is..
I know there are some variation, but I need some realistic numbers to work with.

My plan is to wind a inductor, and I'm going to use a tranformator core as the core for the inductor.
But to calculate the windings I need to know the permeability of the core.
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Old 18th February 2003, 04:33 PM   #2
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The core is soft iron with a small amount of silicone if I'm not wrong. Take the µr for soft iron, this will be a good start. You could also ask for example www.toroid.se and Mikael Gustafsson. mikael@toroid.se or mikael.gustafsson@toroid.se not sure about the email address though.
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Old 18th February 2003, 04:49 PM   #3
tiroth is offline tiroth  United States
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It will depend on the core composition. If you don't know the composition the best way is probably empirical: wind enough turns around the core to some idea of the actual value.
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Old 18th February 2003, 05:16 PM   #4
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Gunderz

I merged your two threads into one, most people here read several areas so you should still get the answers you require

Now, handing back to the intelligent members....
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Old 18th February 2003, 07:20 PM   #5
Jeff R is offline Jeff R  United States
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Typical permeabilities can range from 14 to 550, according to my Magnetics Inc. toroid catalog.

This is a very wide range and is fairly useless information for determining windings. As tiroth said, you may simple need to wind a few turns and see what results.
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Old 19th February 2003, 12:52 AM   #6
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If the inductor is for DC like in a power supply filter then you must have an airgap in the magnetic circuit otherwise it will be practically useless for DC. Fine for AC as in a Xover choke though. Lots of inductance for not much turns = low resistance.
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