Usually, the two-speed , Dahlander winding is well known, but some of them can be tricky and could lead to unusable motor because of high currents at low speed. This is the case most often with 8/4 pole motors at 54 slots.
Here is a publication that will help you to prevent the costly mistakes. This useful pdf-publication contains both diagrams: for variable and constant torque connection as well as the fundamental winding factors and differential leakage coefficients .
