dc drives - lecture 6

dc drives - lecture 6 - DC Drives S.D. Sudhoff Spring 2008...

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DC Drives S.D. Sudhoff Spring 2008
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Spring 2008 ECE321 2 DC Drives • Motivation: How do we control the armature voltage or current in a dc machine ?
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Spring 2008 ECE321 3 Single Quadrant Chopper + - + - + - r v k ω aa L s i dc v a i a v d i a r
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Spring 2008 ECE321 4 Operating Waveforms (Continuous Mode) s i a i a v d i fsw dc v v fd v mx i mn i sw T sw dT + - + - + - r v k ω aa L s i dc v a i a v d i a r
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Spring 2008 ECE321 5 Average-Value Analysis (Voltage Source Operation, Cont. Mode) • Definition of Steady State Average ¾ • Definition of Fast Average ¾ + = sw ss ss T t t sw dt t x T x ) ( 1 = t T t sw sw dt x T t x ) ( 1 ) ( ˆ τ
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Spring 2008 ECE321 6 Average-Value Analysis (Voltage Source Operation, Cont Mode) • Armature Voltage Equation • Torque Equation • Mechanical Dynamics
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Spring 2008 ECE321 7 Average-Value Analysis (Voltage Source Operation, Cont Mode) • Derivation of Average Armature Voltage • Thus we have ) 1 ( ) ( ˆ d v d v v v fd fsw dc a =
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Spring 2008 ECE321 8 Average Value Analysis (Voltage Source Analysis, Cont Mode) • Derivation of Source Current • Thus we have d i i a s ˆ ˆ =
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Spring 2008 ECE321 9 Average Value Model (Voltage Source Operation, Cont Mode)
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Spring 2008 ECE321 10 Average Value Analysis (Voltage Source Analysis, Cont Mode) • Comments on Power ¾ Power into converter ¾ Power into motor ¾ Power into mechanical system s dc cnv i v p = a a mtr i v p = r e mech T p ω =
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dc drives - lecture 6 - DC Drives S.D. Sudhoff Spring 2008...

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