As illustrated below, these coils are connected to form a three phase winding. Each phase is able to produce a specified number of magnetic poles (in the diagram below, four magnetic poles are generated by a phase winding). The windings of the three phase are arranged uniformly around the stator periphery and are labeled in the sequence that phase a is 120o (electrical) ahead of phase b and 240o (electrical) ahead of phase c. It is noted that in the diagrams above, two coil sides are laid in each slot. This type of winding is known as