Lecture Notes # 3

Lecture Notes # 3 - ECE847 WEEK 3 MIDTERM Friday March 2...

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ECE847 - WEEK 3 MIDTERM – Friday March 2, ENG102 Closed book. Four Questions Q1 (30%) - dc Motor Modeling Simulink model Transfer Function Q2 (25%) - Diode/SCR Rectifiers Simulink model Waveforms Q3 (25%) - Reference Frame Theory Transformation between 3Ø and 2 Ø and between different reference frames Q4 (20%) - dc motor speed control with current and speed feedback A number of small questions and/or Multiple choice. Try problems 1.5-1.9, pg.# 20-21 (course notes) 1.14 – DC Motor Speed Control (open loop control) Circuit Diagram an V cn V bn V 6 T 5 T a r AA L FF L dc V 2 T 1 T 3 T 4 T a e o o f V f r α V α a i f i
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Input and output variables of the rectifier α - input variable dc V - Output Variable an V , bn V , cn V - fixed magnitude and frequency (constant) avg dc V , = 2.34 α cos an V avg dc V , rms V 34 . 2 rms V 34 . 2 α o 180 o 90 Linearization Use a 1 cos function α α V 1 cos = 1 1 α V ( ) 1 1 34 . 2 cos cos 34 . 2 cos 34 . 2 1 , = = = α α α α V V V V V V V an an an avg dc = α V V
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