# exam4 - EE321 Exam 4 Spring 2010 Notes : You must show work...

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Unformatted text preview: EE321 Exam 4 Spring 2010 Notes : You must show work for credit. Trigonometric identities are towards the back of Exam 5. 1.) 20 pts. An induction machine stator winding produces an MMF of the form 100cos(100 4 ) s sm F t = + where sm is measured in the CCW direction (as normal). The mechanical rotor speed is 200 rad/s in the CW direction. What is the speed and direction of the rotor MMF as viewed from the rotor. 2.) 20 pts. Consider a two-phase induction machine. Suppose the stator and rotor variables are transformed to the synchronous reference frame in which e e qds s abs = f K f cos sin sin cos e e e s e e = - K e e qdr r abr = f K f cos( ) sin( ) sin( ) cos( ) e r e r e r e r e r -- = --- K where e is the position of the synchronous reference frame, / e e d dt = , and the referred rotor flux linkage equations may be expressed: ' ' cos sin 1 sin cos 1 r r abr rr abr ms abs r r L L...
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## This note was uploaded on 02/19/2012 for the course ECE 321 taught by Professor Staff during the Spring '08 term at Purdue University-West Lafayette.

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exam4 - EE321 Exam 4 Spring 2010 Notes : You must show work...

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