Engineering: leakage in armature

 Magnetic Leakage in Rotating Machines:

Magnetic Leakage in Rotating Machines – The leakage flux in rotating machines is that flux which links only the stator or only the rotor windings. Because of the presence of air-gap in the magnetic circuit of machines, the leakage in these is quite significant and cannot be neglected in analysis as could be done in the case of transformers. The leakage in machines falls into the following two broad categories:

1.      Leakage in main poles, and

2.      Leakage in armature.

Leakage in Main Poles

The main poles of a dc machine and that of a synchronous machine are excited by means of dc to produce a steady properly distributed flux density; the chief difference between the two being that while the poles of a dc machine form the stator and that of a synchronous machine are located on rotor. The useful flux is that flux which coming from the main poles crosses the air-gap and enters the armature. Some of the flux leaks through via two typical pat…