exam3 - EE321 Exam 3 Spring 2009 Notes: There are five...

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EE321 Exam 3 Spring 2009 Notes : There are five questions. You must show work for credit, except for problem 1. Some problems have more information than is needed. The last two pages have trigonometric identities. You can tear these off if more convenient. A score of 60% on this exam satisfies ABET objectives 1,3, and 4. Good luck !
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The following questions should be answered true or false. They are worth 2 pts. each. You do not need to show work. 1a) Single phase machines have forward and backward rotating MMF components. 1b) The stator MMF in a balanced 2-phase machine is qualitatively the same as for a 3- phase machine. 1c) Setting ) / atan( s ss r v r L ϖ φ = yields the optimal efficiency. 1d) Setting the d-axis voltage to zero yields zero d-axis current. 1e) A disadvantage of brushless dc machines is that you need to know or estimate the rotor position. 1f) An oscilloscope trace of the open-circuit line-to-line voltage is sufficient to find ' m λ . 1g) One of the advantages of 3-phase power over 2-phase power involves the
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This note was uploaded on 10/07/2010 for the course ECE 321 taught by Professor Staff during the Spring '08 term at Purdue University-West Lafayette.

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exam3 - EE321 Exam 3 Spring 2009 Notes: There are five...

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