Method

First of all, all slot sequence numbers have to be shifted to align slot 1 and the middle of a pole winding of phase A. Then, a «positive» direction must be established. Typically, the winding current flows up or down a bar in the stator’s slot, so one of those direction is labeled positive. Finally, one goes through all the stator’s slots, adding z for each positive bars and subtracting the same value for each opposite bars. The value of z depends if the winding function calculated is for a whole phase or a single parallel winding. In the first case z equals 1/a while in the other it’s worth 1.

In summary, the winding function for a whole phase is:

Example of winding functions are given below for the precompiled models.