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Oldexam3[1]

Oldexam3[1] - ECE321 Exam III Fall 2009 Last Name First...

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ECE321 Exam III Fall, 2009 Last Name:_____________________________ First Name:_____________________________ User ID (login):___________________ Work problems and provide answers in space provided - do not unstaple pages No calculators 1-page crib allowed (to be submitted with exam). Possibly (not necessarily) useful identities x y ± ( ) cos x cos y cos x sin y sin + = x y ± ( ) sin x sin y cos x cos y sin ± = x cos y cos 1 2 -- x y + ( ) cos x y ( ) cos + [ ] = x sin y sin 1 2 -- x y ( ) cos x y + ( ) cos [ ] = x sin y cos 1 2 -- x y + ( ) sin x y ( ) sin + [ ] =

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1. Consider the following dc motor drive system . Plot , , and and indicate average values in space provided. (b) Evaluate . v a i D 2 i S ω r + i i S v a i D 2 + + a i D 1 i S 1 i S 2 10 V 0.2 Ω 1 mH 0.1 i a v a i D 2 i S I 1 0 = 0.6 T 0 I 2 5 A = T τ a « I a ________ A = V a ________ V = I S ________ A = I D 2 ________ A = T ω r (20) [O iv-v]