In a an DC motor, the rotation of the MNA
- is opposite to the rotation of the armature.
- is slightly less speed than the rotation of the armature.
- is the same as the rotation of the armature.
Explanation
In a motor, armature reaction shifts the magnetic neutral axis (MNA) backwards, against the direction of armature rotation. This is the reverse of a generator, where the MNA shifts forward with rotation, because the armature current direction relative to the field differs between motoring and generating.
Faiz0108 asking:
Wouldn't the rotation of MNA be in the same direction as rotation of armature?
Community Comments (2)
D
dimky Posts: 514 22.07.2013 / 18:59
Hey Faiz!
The overall field of a d.c. motor consists of the armature field and the stator field. The two fields react, as in the d.c. generator, producing armature reaction.
Armature reaction causes the magnetic neutral axis of the motor to be moved around in the opposite direction to that of the generator, against the direction of rotation. The problem can be overcome as in d.c. generators, by fitting compensating windings.
The overall field of a d.c. motor consists of the armature field and the stator field. The two fields react, as in the d.c. generator, producing armature reaction.
Armature reaction causes the magnetic neutral axis of the motor to be moved around in the opposite direction to that of the generator, against the direction of rotation. The problem can be overcome as in d.c. generators, by fitting compensating windings.
M
MridulDev Posts: 48 24.07.2013 / 12:14
To be more clear:
http://www.wisc-online.com/Objects/ViewObject.aspx?ID=IAU13208
http://www.wisc-online.com/Objects/ViewObject.aspx?ID=IAU13208
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