2) The specific strategy for wye-delta soft start is given;
3) The mathematical model describing motor with two
phases conducted is established to analyze the stator current
control in the complex coordinate;
4) The best transforming point is discussed and a standard
slip s0 is found for wye-delta soft transform in a 5.5 kW motor;
5) The soft start method is verified by simulation on a 5.5
kW motor.