Whats difference between star and delta motor wiring?
These motors can be connected in star to a mains of 400 V between the phases (see figure 1). figure 1 Star connection 400/695 V
These motors should be connected in delta to a mains of 400 V between the phases (see figure 2).
There is no difference. A three-phase 'star' connection is simply another name for a 'wye' connection. 'Star' seems to be the preferred name in Britain, whereas, 'wye' seems to be the preferred name in North America -although this is debatable. Out of interest, the alternative name for for a 'delta' winding is a 'mesh' winding.