Why does wound rotor IM have the belt leakage but the squirrel cage rotor does not?
In your statements, you have reversed what is said by Lipo. &quot;harmonic leakage is important only for wound rotor machines.
Here is some material from two other sources:
Alger, The Nature of Polyphase Induction Machines, Wiley, 1951 states “A squirrel-cage winding has no phase belts and its belt leakage is, therefore, zero.&quot;
Puchstein, Lloyd, Conrad, Alternating-Current Machines, Wiley, 1954 states “Belt or Differential Leakage Flux In a wound-rotor motor another element of leakage flux is present by differential distribution of the stator and rotor windings, or by the different positions which one phase belt of the rotor assumes with respect to one phase belt of the stator as the rotor turns.”