The armature reaction mmf in a DC machines has a form of
A. rectangular.
B. triangular.
C. sinusoidal.
D. trapezoidal.
Show Answer
Answer: B
Share your understanding of this question with the correct explanation.
The correct answer is B. Triangular.
The armature reaction in a DC machine refers to the magnetic field produced by the armature current. This armature reaction MMF (magneto-motive force) distribution has a triangular shape. As the armature current flows through the windings, it creates a magnetic field that interacts with the main magnetic field produced by the field windings. The resulting armature reaction MMF distribution has a triangular waveform, with the peak occurring at the center of the pole and decreasing towards the pole edges.
The triangular shape of the armature reaction MMF is important to consider in the design and operation of DC machines, as it affects the overall magnetic field distribution and can lead to various effects such as commutation difficulties and distortion of the field flux.