Oldexam3[1] - ECE321 Exam III Fall 2009 Last Name First Name User ID(login Work problems and provide answers in space provided do not unstaple

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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 xy ± () cos x cos y cos x sin y sin + = ± sin x sin y cos x cos y sin ± = x cos y cos 1 2 -- + cos cos + [] = x sin y sin 1 2 cos + cos = x sin y cos 1 2 + sin 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]
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2. The dc motor in problem 1 is supplied by a 4-quadrant chopper with . (a) Establish the duty cycle needed to develop 5 N-m at ( , ). (b) The duty cycle is stepped to 0.55. Assuming the speed does not change due to large inertia, establish the average dc current returned to the dc source (i.e. ) v S 50 V = 100 rad/s T e 5 N-m = ω r 100 rad/s = k ____________ = I S (20) [O iv-v]
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3. Consider a machine with 2 series-connected coils (
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This note was uploaded on 11/29/2010 for the course ECE 321 taught by Professor Staff during the Spring '08 term at Purdue University-West Lafayette.

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Oldexam3[1] - ECE321 Exam III Fall 2009 Last Name First Name User ID(login Work problems and provide answers in space provided do not unstaple

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