Page 207 - Electrician - TT (Volume 1)

ELECTRICIAN - CITS

TPT
• End of pole tip which comes in contact later with armature in DOR

What is armature reaction ?
The effect of armature flux produced by the armature current on the main flux or field flux.

• Effects…The armature reaction produces the following two undesirable effects:
1 It demagnetizes or weakens the main flux.
` 2 It cross-magnetizes or distorts the main flux

Explanation
• Consider main field flux only

• Consider armature flux only

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CITS : Power - Electrician & Wireman - Lesson 30-37