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Armature reaction in a DC generator?

April 26, 2017armature dc generator REACTION

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Armature reaction in a DC generator?

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If the magnetic field windings of a DC machine are connected to a power supply and the rotor of the machine is turned by an external source of mechanical power then a voltage will be induced in the conductors of the rotor. If a load is connected to the terminals of the machine a current will flow in the armature (rotor) windings. This current will produce a magnetic field of its own , which will distort the original magnetic field from the machine’s poles. This distortion of the flux in a machine as the load is increased is called ARMATURE REACTION. This armature reaction causes two main problems in DC machines: neutral-plane shift and flux weakening.