The stator winding of a motor of example 1 is delta-connected with 240 conductors per phase and the rotor winding is star-connected with 48 per phase. The rotor winding has a resistance of 0.013?/ph and a leakage reactance of 0.048?/ph at standstill. The supply voltage is 415V. Assuming the distribution factor to be 0.96 and the pitch factor to be 1.0 for each winding,
calculate
a) The flux per pole
b) The rotor emf per phase at standstill with the rotor on open circuit.
c) The rotor emf and current per phase at 4% slip
d) The phase difference between the rotor emf and current for a slip of:
i) 4%
ii) 100%.
Assume the impedance of the stator winding to be negligible.
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