![]() ![]() The reason for this is due to finite winding resistance and Ohm's law. As current is drawn from the secondary, the flux falls slightly. The small current that flows maintains the flux density at the maximum allowed value, and represents iron loss (see Section 2). At idle, the transformer back-EMF almost exactly cancels out the applied voltage. Be that as it may, it's a fact, and missing it will ruin your understanding of transformers. ![]() ![]() The idea is counter-intuitive, it even verges on not making sense. I will repeat this, as it is very important .įor any power transformer, the maximum flux density is obtained when the transformer is idle. For any power transformer, the maximum flux density in the core is obtained when the transformer is idle. While this is covered in more detail in Section 2, it is important that this section's information is remembered at every stage of your reading through this article. One thing that obviously confuses many people is the idea of flux density within the transformer core. ![]()
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