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Engineering Science by Lloyd Dingle, Mike Tooley

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Chapter 28 Coupled magnetic circuits

28.1 Mutual inductance

When two inductors are placed close to one another, the flux generated when a changing current flows in the first inductor will cut through the other inductor (see Figure 28.1). This changing flux will, in turn, induce a current in the second inductor. This effect is known as mutual inductance and it occurs whenever two inductors are inductively coupled. This is the principle of a very useful component, the transformer, which we shall meet later.

28.1.1 Coefficient of coupling

Let s assume that two coils, having inductances L1 and L2, are placed close together. The fraction of the total ...

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