How Do You Determine the Permeability of Steel Screws Used in Electromagnets?

AI Thread Summary
To determine the permeability of steel screws used in electromagnets, it's important to recognize that the material is likely carbon steel, which has varying permeability based on its formulation. The best approach is to refer to the manufacturer's specifications for the specific type of steel used. Alternatively, measuring the permeability directly with appropriate instrumentation is suggested, such as using a gaussmeter made from a multimeter and a compass. Resources and instructional videos are available online to assist with this measurement process. Understanding the permeability is crucial for accurately predicting the B-Field strength of the electromagnet coils.
Jdo300
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Hello All,

I'm working on a project involving the use of electromagnets and I am trying to do some calculations to predict the B-Field strength of the coils I make. For the core, I'm just using some common 1/4-20 steel machine screws (the common ones you can get from Home Depot and Lowes) but I'm not sure how to account for the permeability of the steel in my calculations.

Does anyone have any idea how one might determine this information? I know that the material will not have a fixed value (BH Curve) but if I could know what kind of steel is used, that would help a lot. Does anyone have any idea about this?

Thanks,
Jason O
 
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The material is likely carbon steel. But there are many formulations of carbon steel with different permeabilities. You'll have to refer to the manufacturer.
 
Measure it. :)
 
I would just measure it, but that would require some instrumentation. What sort of electrical instruments do you have available to make measurements?
 

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