Dr. Ahmed G. Abo-Khalil

Electrical Engineering Department

Armature reaction

In a DC machine, the main field is produced by field coils. In both the generating and motoring modes, the armature carries current and a magnetic field is established, which is called the armature flux. The effect of armature flux on the main field is called the armature reaction.

The armature reaction:

demagnetizes the main field, and

cross magnetizes the main field

The demagnetizing effect can be overcome by adding extra ampere-turns on the main field. The cross magnetizing effect can be reduced by having common poles

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