DC motor: A DC motor is any class of electrical machines that converts direct current electrical power into mechanical power. The most common types rely on magnetic fields.
Armature: The part of an electrical motor or generator that produces an electric current when it turns in a magnetic field.
Magnetic flux: Magnetic flux is the number of magnetic field lines (also called as magnetic flux density) passing through A closed surface such as conducting coil. The SI unit of magnetic flux is the weber(Wb).
So in this case, a DC motor, two sorts of magnetic(attractive) fluxes are available, ‘armature flux’ and ‘primary field flux’. The impact of armature flux on the primary field flux is called armature reaction or response.
MNA and GNA
EMF is actuated in the armature conductors when they disconnect the attractive field lines. Be that as it may, there 's a hub (or plane) along which armature conductors move parallel to the flux lines and henceforth, they momentarily don 't disconnect.
MNA (Magnetic Neutral Axis) might be characterised as the pivot along which no EMF is created in the armature conductors as they move parallel to the flux lines. Brushes are constantly put along MNA in light of the fact that inversion of current in the armature conductors happens along this pivot.
GNA(Geometrical Neutral Axis) might be characterised as the pivot which is perpendicular to the stator field hub.
Consider, no current is streaming in there armature conductors and just the field winding is empowered(as appeared in the first figure of the above picture). For this situation, magnetic (attra...
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...he armature response is because of the vicinity of armature flux. Armature flux is delivered because of the current streaming in armature conductors. If we put another winding in close nearness of the armature winding and if it conveys the same current however the other way of that of the armature present, this will invalidate the armature field. Such an additional winding is called compensating winding and placed on the pole faces. Compensating winding is connected in series with the armature winding in a manner that it conveys the current in opposite direction.
Interpoles are the small auxiliary poles set between the primary field posts. Winding on the interpoles is in series with the armature. Each interpole is wound in a manner that it 's magnetic polarity is same as that of the principle pole infront of it. Interpoles nullify the quadrature axis armature flux.
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