Due to armature reaction in a DC motor
- the leading pole tips are magnetically weakened.
- the trailing pole tips are magnetically weakened.
- the magnetic flux is restored by moving the MNA towards the GNA.
Afshinarabi asking:
Due to armature reaction in a DC motor ,the leading pole tips are magnetically weakened .the armature flux opposes the main field flux ate leading tip and aids it at the trailing tip :due to magnetic saturation ,the net effect is a reduction in flux at the leading tip overall demagnetization.
Community Comments (2)
S
svenj88 Posts: 1 12.05.2026 / 20:28
Strictly speaking, B is correct. In a DC motor armature reaction strengthens the leading pole tip and weakens the trailing one; what you described is the generator case, where the polarity of the armature current is reversed.
A
Afshinarabi Posts: 2 12.05.2026 / 23:14
yes.you right,thanks
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