ARMATURE REACTION Meaning and
Definition
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Armature reaction refers to the phenomenon that occurs in a DC electric machine, such as a motor or generator, where the magnetic field produced by the current flowing through the armature windings interacts with the main magnetic field generated by the field windings. This interaction alters the distribution of the magnetic flux lines in the machine, causing a displacement of the magnetic field from its original position.
The effect of armature reaction can be divided into two components: demagnetizing and cross-magnetizing effects. The demagnetizing effect occurs when the armature current establishes a magnetic field that opposes the main field, resulting in a reduction in the overall magnetic flux. This can lead to a decrease in the machine's output power. The cross-magnetizing effect, on the other hand, refers to the lateral displacement of the magnetic field lines due to the interaction between the armature and field windings.
Armature reaction has several consequences on the performance of the DC machine. It can lead to a weakening of the magnetic field, increased losses, and reduced efficiency. Additionally, it can cause changes in the neutral plane and flux distribution, resulting in changes in the machine's torque and speed characteristics.
To minimize the impact of armature reaction, various methods such as interpoles, compensating windings, and brush shifting techniques can be employed. These methods help to counteract the effects of armature reaction and maintain the desired performance and efficiency of the DC machine.
Common Misspellings for ARMATURE REACTION
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Etymology of ARMATURE REACTION
The word "armature" comes from the Latin word "armatura", which means "equipment" or "armament". It is derived from the Latin word "armare", meaning "to arm". In the context of electrical engineering, an armature refers to the moving part of a machine, such as a motor or generator.
The term "armature reaction" originated in the field of electrical engineering, particularly in relation to direct current (DC) machines. When a current flows through the armature windings of a DC machine, it creates a magnetic field. This field interacts with the stationary magnetic field generated by the stator, resulting in what is known as the armature reaction.
The word "reaction" in "armature reaction" refers to the effect caused by the interaction between the armature's magnetic field and the stator's magnetic field.
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