What are types of 3 phase induction motors winding Connections

Connection of the motor winding:

There are several ways of connecting a three phase motor winding . The most common ones
3-phase connection are:

1)delta(∆)-connection  
2)star (Y)-connection.

3-phase connection of induction motor winding

According to the IEC 60034-8 standard, the windings of a 3-phase standard motor can be connected in either a star (Y)-connection or in a delta (∆)-connection.

Star (Y)-connection:

By short-circuiting the terminals W2, U2 and V2 and connecting the mains to W1, U1 and V1, you get a star (Y)-connection. 

Fig:star connected 3 phase motor winding connection diagram

fig:Fig: current in star connected motor winding

Delta (∆)-connection:

When you connect the end of a phase to the start of another phase you get a delta (∆)-connection 
i.e  W2-U1, U2-V1, V2-W1 as shown in figure by connecting main supply to U1 V1 W1

                  Fig: delta connected 3 phase motor winding connection diagram

Fig:delta connected motor winding current