armature reaction: meaning, definition, pronunciation and examples
C2 / Very Low FrequencyTechnical / Engineering
Quick answer
What does “armature reaction” mean?
A phenomenon in electric motors and generators where the magnetic field produced by current in the armature winding distorts or opposes the main magnetic field, affecting performance.
Audio
Pronunciation
Definition
Meaning and Definition
A phenomenon in electric motors and generators where the magnetic field produced by current in the armature winding distorts or opposes the main magnetic field, affecting performance.
In engineering, the undesirable effect of the armature's magnetic field on the main field flux, leading to issues like sparking at brushes, reduced torque, or inefficient operation, which often requires corrective measures such as interpoles or compensating windings.
Dialectal Variation
British vs American Usage
Differences
No significant lexical or spelling differences exist for this term. Both regions use the same term identically within the technical field.
Connotations
Purely technical and neutral in both varieties.
Frequency
Extremely rare outside of electrical engineering textbooks, motor design papers, and technical manuals. Frequency is equally low in both UK and US contexts.
Grammar
How to Use “armature reaction” in a Sentence
The [machine/design] suffers from armature reaction.Engineers compensate for armature reaction using [interpoles/compensating windings].Armature reaction causes [sparking/field distortion].Vocabulary
Collocations
Examples
Examples of “armature reaction” in a Sentence
adjective
British English
- The armature-reaction effect was severe.
- We need an armature-reaction compensation circuit.
American English
- The armature-reaction problem was significant.
- An armature-reaction compensation winding was added.
Usage
Meaning in Context
Academic
A core concept in electrical engineering courses on electric machines, discussed in research on motor design and performance optimization.
Everyday
Virtually never used in everyday conversation.
Technical
Used by electrical engineers, motor designers, and technicians when diagnosing motor performance issues or designing mitigation strategies.
Vocabulary
Synonyms of “armature reaction”
Neutral
Weak
Vocabulary
Antonyms of “armature reaction”
Watch out
Common Mistakes When Using “armature reaction”
- Misspelling as 'armature re*action*' (two words).
- Incorrectly capitalising it as a proper noun.
- Using it as a verb, e.g., 'The motor armature-reacts.'
FAQ
Frequently Asked Questions
While the term is most commonly associated with DC machines, similar effects from armature magnetomotive force (MMF) occur in AC synchronous machines, affecting voltage regulation and stability.
No, it cannot be completely eliminated as it is a fundamental physical consequence of current flowing in the armature. However, its negative effects can be significantly reduced and managed through careful design and corrective features.
Yes. By distorting the main magnetic field, armature reaction can shift the magnetic neutral plane, leading to inefficient torque production and potentially causing cogging or uneven rotation.
Primarily electrical engineers specialising in machine design, maintenance technicians working on industrial motors and generators, and advanced students of electrical engineering.
A phenomenon in electric motors and generators where the magnetic field produced by current in the armature winding distorts or opposes the main magnetic field, affecting performance.
Armature reaction is usually technical / engineering in register.
Armature reaction: in British English it is pronounced /ˈɑː.mə.tʃə rɪˈæk.ʃən/, and in American English it is pronounced /ˈɑːr.mə.tʃɚ riˈæk.ʃən/. Tap the audio buttons above to hear it.
Learning
Memory Aids
Mnemonic
Think of the ARMATURE (the rotating part) having a REACTION to the main magnet's field — it fights back, creating a distortion.
Conceptual Metaphor
A TUG-OF-WAR metaphor: The main magnetic field and the armature's magnetic field are two teams pulling against each other, distorting the neat lines of force.
Practice
Quiz
What is a common method to counteract armature reaction in DC machines?