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Why compensating winding is provided in a universal motor for AC operation?
The compensating winding helps in reducing the reactance voltage which is caused due to alternating flux, when the motor runs with the aid of an AC supply. Both the types of motors develop unidirectional torque regardless of the supply with which they run. The supply may be AC or DC but the direction of torque is same.
What is the use of interpole winding?
Interpoles in DC machine has basically two functions: Automatic neutralization of cross magnetization due to armature reaction. To counter and cancel reactance voltage in the coil undergoing commutation.
Why Interpole is used in DC machine?
The task of interpoles in DC machines is to make the commutation spark free. In a DC Generator, their polarity will be same as the main pole ahead in the direction of the rotation of generator, while for a DC Motor their polarity will be opposite to that of main pole ahead in the direction of rotation.
Which connection is used between Interpole winding and armature winding?
Inter-poles are similar to the main field poles and located on the yoke between the main field poles. The inter-pole winding is connected in series with the armature winding because the inter-pole must produce flux that is directly proportional to the armature current.
Why is compensating wind used in motors?
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 is compensating winding required in an AC series motor explain the two ways of providing compensating winding?
The arcing and sparking is mitigated by placing a compensating winding the stator in series with the armature positioned so that its magnetomotive force (mmf) cancels out the armature AC mmf. A smaller motor air gap and fewer field turns reduce lagging reactance in series with the armature improving the power factor.
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.
Why compensating winding is provided in a large DC generator?
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.
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 is meant by compensating winding?
Definition of 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.
Why is compensating winding necessary?
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.