Electronic – How is it that the induced EMF in an alternator is in quadrature with the main flux

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Looking at the simplified diagram of an alternator, the flux "linked" with the conductor is maximum at 90, 270 degrees, is also when induced EMF is maximum. So isn't the main flux in phase with the induced EMF, or are my assumptions flawed?

It's important to note that in an alternator, motional EMF is created which depends on the spatial angular displacement between an uniform magnetic field and a conductor perpendicularly placed. A time varying EMF is induced only because the angular displacement is a function of time, not the magnitude of the magnetic field itself.

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Best Answer

At school I was taught that the voltage induced was proportional to the rate at which magnetic field lines were being cut by the windings. In reality the field lines don’t literally exist, but it’s a useful tool at an intuitive level. The EMF is in proportion to the rate of change in magnetic field that the coil experiences. Does that help?

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