What is the dynamically induced emf?

Whenever a conductor cuts the lines of force at an angle, an emf is induced in the conductor. Here is dynamically induced emf, the relative motion between the flux and the conductor is essential. It can be either rotating the magnetic field and conductor as stationary or conductor rotating and magnetic field as stationary.

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How Commutator changes AC into DC?

The brushes are fixed in the rocker and poles are also mounted stationary so whenever the conductor comes in contact with the brushes, it has definite magnitude and direction of emf and all the conductors at this particular position will have only this emf which will be the same direction or magnitude for external circuit. Thus originally produced AC in the conductor is changed to DC for the external circuit.

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