Electrical Machines Alternator and Synchronous Motors Alternator Rotor Types

The results of a slip test for determining direct-axis (X_d) and quadrature-axis (X_q) reactances a star connected salient pole alternator are given below:

Phase values : V_max = 108 V; V_min = 96 V;

I_max = 12A; I_min = 10A;
Hence the two reactances will be

1

X_d = 10.8Ω and X_q = 8Ω

2

X_d = 9.6Ω and X_q = 9Ω

3

X_d = 9Ω and X_q = 9.6Ω

4

X_d = 8Ω and X_q = 10.8Ω

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