14 Nonlinear magnetic circuits

14 Nonlinear magnetic circuits - Lecture 16 Nonlinear...

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Lecture 16 Nonlinear Magnetic Circuits Consider an iron core with a single coil as shown in Figure 1 . Figure 1 - Iron Core If we inject dc current to the coil there will be a flux Φ flowing around the core. If we keep increasing the current, at some point the flux will lose its linearity and the flux in the core will saturate, i.e., there is a limit in the total flux that can flow in a magnetic conductor. This occurs because the magnetic moments of the conductor are all aligned with the magnetic field. Figure 2 shows this effect. Figure 2 - Flux saturation of magnetic core. If instead we apply an ac current to the coil, then the flux will also tend to be sinusoidal, but then another effect takes place called remanent magnetization . Take for instance a sinusoidal current in its positive part. When the current is increasing, the magnetic moments of the core will start aligning with the magnetic field following a sinusoidal
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pattern. When the current reaches its maximum, then if the core saturated the flux will no longer be sinusoidal, if this is not the case then the flux will remain sinusoidal. When the
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This note was uploaded on 01/27/2011 for the course ECSE 361 taught by Professor Franciscodgaliana during the Spring '09 term at McGill.

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14 Nonlinear magnetic circuits - Lecture 16 Nonlinear...

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