Magnetics of transformers and induction in metals

AI Thread Summary
Current in the primary coil of a transformer induces a voltage in the secondary coil, even when a sheet of steel, like a pipe, is placed between them. The ability to induce voltage through the steel depends on several factors, including the geometry of the steel, the type of steel used, the geometries of the coils, and the frequency of the current. It is important to note that it is the changing magnetic field (B field) that induces the voltage, not the current itself. The discussion highlights the complexities involved in transformer design and the influence of materials on induction. Understanding these factors is crucial for optimizing transformer and motor performance.
Sam Yerardi
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If you have the primary and secondary coils of a transformer next to each other, then current will induce a voltage in the secondary coil, creating current flow. This question applies to motors as well. If I place a sheet of steel between the two coils, will I still induce a voltage? For example, say I have a steel pipe and inside the pipe I place a secondary coil of wire. Outside the pipe I place a primary coil. Can I induce a voltage in the secondary coil through the steel pipe?
 
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The answer is yes, with a lot of qualification. How much induced voltage you get will greatly depend on specific geometry of the steel, the type of steel, the coil geometries, frequency, etc.

And, it's the changing B field that induces the voltage in the secondary, not the current.
 
Thanks. I guess I worded the question incorrectly. I meant the current in the primary coil. Thanks again!
 
Do you have a specific problem in mind?
 

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