Section 15.4: Performance Calculations cont.

Example 15.2 cont.

The (Thevenin) equivalent circuit impedance of the motor is: ZTh = (Rs + jXs) + jXm||(Rr/s + jxr) \

ZTh = (0.2 + j0.5)W + j20W||(0.2 + j4)W » 4.23/+20°W and

Is = Vt / ZTh = 127/0° V. / 4.23/+20°W » 30/-20° A.

so |Is| = 30 A. and Pin = 127V.´30A.cos(-20°) » 3.58 KW

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