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What is meant by compensating winding?

What is meant by compensating winding?

: a winding embedded in the pole faces of a commutating alternating-current or direct-current machine and connected in series with the armature, the magnetic field of the winding neutralizing the cross-magnetizing field of the armature.

What is Interpole and compensating winding?

The field generated by the interpoles produces the same effect as the compensating winding. This field, in effect, cancels the armature reaction for all values of load current by causing a shift in the neutral plane opposite to the shift caused by armature reaction.

What is compensating winding why it is used?

A compensation winding in a DC shunt motor is a winding in the field pole face plate that carries armature current to reduce stator field distortion. Its purpose is to reduce brush arcing and erosion in DC motors that are operated with weak fields, variable heavy loads or reversing operation such as steel-mill motors.

Why Interpole is used in DC machine?

Interpoles are designed in DC motors to overcome the effects of the armature reactance and the self-induction of the machine. This creates a changing magnetic field equal to and opposite that of the armature, thereby cancelling the effect. Polarity of an interpole depends on the direction of rotation.

What is GNA and MNA?

MNA (Magnetic Neutral Axis) may be defined as the axis along which no emf is generated in the armature conductors as they move parallel to the flux lines. GNA (Geometrical Neutral Axis) may be defined as the axis which is perpendicular to the stator field axis.

What is unsaturated DC machine?

Armature reaction of unsaturated DC machine results in cross – magnetizing effect. Armature reaction distorts the main flux, hence the position of M.N.A. While for a loaded dc motor, MNA will be shifted in the direction opposite to that of the rotation.

What is the function of the compensating winding?

Because the function of the compensating winding is to neutralize the armature reaction of the machines. We place the compensating winding on the pole faces of the field system in the machine. There is a number of slots in pole shoes to hold this winding on the pole faces.

Where do you place the compensating winding in a DC machine?

We place the compensating winding on the pole faces of the field system in the machine. There is a number of slots in pole shoes to hold this winding on the pole faces. We connect this with the main armature winding in series so that the same current can flow through the armature winding as well as the compensating winding.

Why do Compensating windings cancel the cross magnetizing effect?

Because the compensating windings are wound to produce a field that opposes the magnetic field of the armature, they tend to cancel the cross magnetizing effect of the armature magnetic field. The neutral plane will remain stationary and in its original position for all values of armature current.

What are the components of a neutralizing transformer?

A neutralizing transformer constructed in accordance with the teachings of this invention will comprise the use of shielded flat conductor cable or conductor ribbon wound in a coil form wherein the shield functions as the primary winding and the flat conductors function as the secondaries of the transformer.