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Unformatted text preview: ECE 610 -HW#10, Due December 1, 2011 1) For the induction machine shown in Figure 4.2-1. Derive expressions for , , and . If , , . Show the speed and direction of the net rotor MMF when . Explain what happens when . Give a circumstance /example where ( ) could occur (and is indeed desirable). 2)Using similar steps to those presented for the 2-pole machine in class, explain that the rotor cur- rents of a P-pole machine are . 3) Given an 8-pole induction machine with and . and are defined in the same direction. a) Fill in the table below. b) What is the frequency of the rotor currents? c) What is the frequency of the rotor flux linkages in the stationary reference frame? d) What is the frequency of the stator flux linkages in the rotor reference frame? 4) For the induction machines considered in Fig. 4.2.1 of K&W, the MMF of the stator can be expressed as and the magnetic axis of the stator windings are distributed as Table 1: speed relative to person on stator person on rotor MMF ar MMF...
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- Fall '09