What is the function of the compensation winding?

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.

What is Interpol winding?

Interpoles, also known as compensation windings, are extra field poles “in-between” the main field poles, thus “interpoles”. (Not the same as INTERPOL the Intl. police agency.) It does electrically what advancing the brush angle does mechanically, only better.

What is the function of compensating winding in AC series motor?

Compensating winding in AC series motor is used to reduce sparking of brushes. Important Point: In a DC machine, two kinds of magnetic fluxes are present (armature flux and main field flux). The effect of armature flux on the main field flux is called as armature reaction.

Why does a compensating winding is connected in series with the armature?

Compensating winding is also known as pole face winding. This winding is embedded in the slots in pole faces. It is connected in series with the armature winding so that their mmfs are proportional to the same current.

What are the function of Interpoles and how are the Interpole winding connected?

Interpoles are wired in series with the armature. Any changes in the armature current due to armature reactance, loading, or self-inductance pass through the interpole windings. This creates a changing magnetic field equal to and opposite that of the armature, thereby cancelling the effect.

What is the function of split rings in DC generator?

Hint: Split rings are also known as commutators. They are used in DC electric motors to maintain a steady current to the windings which should produce a constant torque since the current direction in a coil is reversed after each half turn.

Why is the compensating winding provided in a DC motor?

The main purpose of compensating winding is to nullify the effect of armature reaction on the main field flux under the pole faces in DC machine. Due to the effect of armature reaction mmf, the flux distribution under the pole faces is distorted which leads to poor commutation and flashover.

What is compensated single phase series motor?

Compensated winding is embedded in the pole faces of a commutating alternating-current machine and connected in series with the armature, the magnetic field of the winding neutralizing the cross-magnetizing field of armature reaction. The resultant motor was found to have significantly lower stator field distortion.

How power factor of AC series motor is improved?

What about power factor how we can improve power factor? Now the power factor is directly related to reactance of the field and armature circuit and we can reduce the field winding reactance by reducing the number of turns in the field winding.