what is the difference between concentrated winding and
Distributed winding in motor?
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Answer Posted / davod habibinia
Concentrated winding in 3 phase armature means that the value of distribution factor (kd in many references) be equal to 1. It means that the winding is concentrated along a pole.
In distributed winding the value of kd in the base winding (machine period) is below 1, which determines that the value of the induced EMF in one phase is less than the value of "induced EMF in one coil * number of coils series in one phase" .
With this definition the only winding in 3 phase anrmature which have concentrated winding is the machine having q=1 (q is the number of slot per pole per phase) .
Then there is machines which has the winding with one slot pitch (q=0.4), but illegally said to have concentrated winding but actually the winding is distributed with kd=0.9659 and kp=0.9659 and therefore kw=kd*kp=0.933. (Kp is pitch factor) . The value of winding factor (kw) could be determined with star diagram of winding, and pitch factor too, then we can see that the kd will be lower than one for this machine (q=0.4).
These type of machines which has one slot pitch for the each coil of their winding are called "tooth wound machines" and not concentrated.
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