wye versus delta motor windings
wye versus delta motor windings
(OP)
What (if any ) are the advantages of wye versus delta motor windings ?
I understand most two speed motors are equiped with both windings ( wye for start and Delta to run ) but what are the differences ?
I understand most two speed motors are equiped with both windings ( wye for start and Delta to run ) but what are the differences ?





RE: wye versus delta motor windings
RE: wye versus delta motor windings
(Reference: Liwschitz-Garak Electric Machinery Volume II Page 138.)
RE: wye versus delta motor windings
In some applications star is used during starting to reduce the starting current and stress on the power system
For HT motors , voltage withstand capacity is important. Hence star is preferred as Phase voltage = 0.577 * line voltage.
RE: wye versus delta motor windings
RE: wye versus delta motor windings
Thanks a lot
Alfredo Corona
RE: wye versus delta motor windings
1. Short circuit current Iwye,ab,sc between the phase a and phase b on the motor input terminals for wye connected motor is:
Iwye,ab,sc = Vt / 2Z
where
Vt is the motor terminal voltage
Z is impedance of one star winding wing
2. Short circuit current Idelta,ab,sc between the phase a and phase b on the motor input terminals for delta connected motor is:
Idelta,ab,sc = Vt / 2Z
Therefore, Idelta,ab,sc = Iwye,ab,sc
The short circuit current phase to phase on the motor input terminals a and b is the same for delta connected motor and wye connected motor for the same motor terminal voltage Vt.