What are the advantage of short Chorded winding?

Advantages of Short Pitch Coil or Chording It shortens the ends of the winding and, therefore, there is a saving in the conductor’s material. It reduces the effects of distorting harmonics and thus the waveform of the generated voltage is improved and making it a sine wave.

Why do we prefer short pitch winding?

Short pitched coils are deliberately used because of: Due to elimination of high frequency harmonics, eddy currents and hysteresis losses; which in turn increases the efficiency. They save copper if end connections, which is a big economic win. They improve the wave form of the generated EMF.

Why winding in armature of alternator is short pitched?

In this case, the phase difference between emf of two coil side is also less than 180 degree (electrical). Hence, the resultant emf of the coil is not a simple arithmetic sum of two emfs, but it is the vector sum of two emfs. Hence, resultant emf of a short-pitched coil is always less than that of a full pitched coil.

What are the advantages of distributing and short pitching a winding in rotating machine?

Advantages of Distributed Winding: It reduces harmonics present in the generated emf which also improves the sine waveform. It reduces armature reaction and improves cooling. The coil is distributed over the slots, so the core (copper and iron) is fully used.

What is the disadvantage of short pitch coil?

The disadvantage of using short-pitch winding is that the total voltage around the coils is somewhat reduced. In order to compensate for this reduction in Generated EMF, more number of turns, and therefore more copper is required.

What is short pitch winding?

Short pitch winding. The angular distance between the two coil sides is one pole pitch, it is called a full pitch coil. The angular distance between the two coil sides is less than one pole pitch, it is termed short pitch or fractional pitch coil. The coil span equal to 180 electrical degrees.

What is the disadvantage of a short-pitched coil?

What is the difference between full pitch and short pitch?

In a full pitch coil, the coil span will be 180° electrical ( equal to pole pitch ). In a short pitch coil, the coil span will be (180 – α)° electrical ( α = angle by which coils are short-pitched and always less than pole pitch ).

What is short pitch in alternator?

Similarly, if the distance between two coils sides of a coil placed in the slot is less than the pole pitch ( i.e., less than 180° electrical ), it is known as ‘Short Pitch Coil or Chorded Coil’ as shown in the below figure.

What are the advantage of distributing the winding in slots?

The effect of harmonics is eliminated. With the elimination of harmonics, iron losses are reduced therefore, Efficiency will be increased. Armature winding is well balanced since winding is placed in all slots. Temperature rise (copper losses) are uniformly distributed. So, the cooling is effective.

What is the short pitch?

If the angular distances between the two coil sides are less than one pole pitch, it is termed short pitch or fractional pitch coil. The coil span or coil pitch for short or fractional pitch coil is less than 180 electrical degree. In such coils, the two coil sides are not under the poles.

What is the main disadvantage of using short pitch winding in alternators?

What are the advantages of short pitch winding?

The advantages of Short Pitch winding are as follows:- Reduces the amount of copper needed for end connection rather than full pitch winding It improve the waveform of generated EMF i.e. generated EMF can be made to approximate to a sine wave more easily and the distorting harmonics can be reduced

What is the use of short pitch in alternator?

Short pitching can be used to eleminate harmonics of a particular order in alternators. In full pitched coils, as one conductor of a turn in a coil cuts N pole, the other conductor of same turn cuts S pole resulting in production of induced emf (E).

What is full pitched winding and short pitched winding?

Full pitched winding: The pitch of the coil is equal to full pitch or equal to 180 (degrees) then the coil is called the full pitched winding. Short pitched winding or short chorded winding: If the pitch of the coil is less than 180(degrees) or less than the full pitch then the coil is called short pitched coil.

What are the advantages of short pitched coil?

Short Pitching reduces the amount of copper needed for End Connection when compared with Full Pitched Coil as can be observed from the figure above. They improve the waveform of generated EMF i.e. generated EMF can be made to approximate to a sine wave more easily and the distorting harmonics can be reduced or totally eliminated.