Lecture Set 4

# Lecture Set 4 - Lecture Set 4 DC Machines and Drives S.D...

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Lecture Set 4 C Machines and Drives DC Machines and Drives S.D. Sudhoff Spring 2012

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Reading Electromechanical Motion Devices, 2 nd Edition h Sections 3.1-3.6 2
General Comments on DC Machines • Attractive Features 3 • Drawbacks

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DC Machine Cutaway View 4
DC Machine Cutaway View 5

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An Elementary DC Machine 6
Analysis of Elementary Machine • Flux linkage equations 7

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Analysis of Elementary Machine • Armature voltage 8
Operation of Elementary Machine 9

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A More Practical DC Machine 10
An Idealized DC Machine 11

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Analysis of Idealized Machine: Flux Linkage Equations 12
Analysis of Idealized Machine: Armature Voltage Equation 13

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Analysis of Idealized DC Machine: Field Voltage Equation 14
Analysis of Idealized DC Machine: Torque Equation 15

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Model Summary 16
Mechanical Dynamics 17

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Separately Excited Machine 18
A Quick Example • Consider a machine with following parameters h r a =200 m h L af =200 mH 19 h r f =10 • Suppose the armature voltage is 100 V, the field voltage is 10 V, and the speed is 4600 rpm. Compute the torque, output power, input power and efficiency

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A Quick Example 20
Derivation of Torque Speed Curve 21

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Capability Curve • Let’s consider a machine with the following parameters h r a = 200 m h L af = 200 mH 22 h r f = 10 • And subject to the following limits h Armature current: 20 A h Armature voltage: 150 V h Field Current: 1 A
Capability Curve 23

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Capability Curve 24
Capability Curve: Torque 3 4 5 5 25 0 200 400 600 800 1000 1200 1400 1600 1800 2000 0 1 2 0 T emax ϖ i ( 29 2 10 3 × 2.002 ϖ i

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Capability Curve: Power 2000 2500 3000 2.92 10 3 × 26 0 200 400 600 800 1000 1200 1400 1600 1800 2000 0 500 1000 1500 0 T emax ϖ i ( 29 ϖ i 2 10 3 × 2.002 ϖ i
Shunt Connected Machine 27

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Derivation of Torque Versus Speed: Shunt Connected Machine 28
Series Connected Machine 29

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Torque Versus Speed: Series Connected Machine 30
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Lecture Set 4 - Lecture Set 4 DC Machines and Drives S.D...

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