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Chapter 13 DC-Motor Drives

Chapter 13 DC-Motor Drives. These drives continue to be used. DC-Motor Structure. With permanent magnets or a wound field. DC-Motor Equivalent Circuit. The mechanical system can also be represented as an electrical circuit. Four-Quadrant Operation of DC-Motor Drives.

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Chapter 13 DC-Motor Drives

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  1. Chapter 13 DC-Motor Drives • These drives continue to be used Chapter 13 DC Motor Drives

  2. DC-Motor Structure • With permanent magnets or a wound field Chapter 13 DC Motor Drives

  3. DC-Motor Equivalent Circuit • The mechanical system can also be represented as an electrical circuit Chapter 13 DC Motor Drives

  4. Four-Quadrant Operation of DC-Motor Drives • High performance drives may operate in all four quadrants Chapter 13 DC Motor Drives

  5. DC-Motor Drive Torque-Speed Characteristics and Capabilities • With permanent magnets Chapter 13 DC Motor Drives

  6. DC-Motor Drive Capabilities • Separately-Excited field Chapter 13 DC Motor Drives

  7. Controlling Torque, Speed and Position • Cascaded control is commonly used Chapter 13 DC Motor Drives

  8. Small-Signal Representation of DC Machines • Around a steady state operating point Chapter 13 DC Motor Drives

  9. Electrical Time-Constant of the DC Machine • The speed is assumed constant Chapter 13 DC Motor Drives

  10. Mechanical Time-Constant of the DC Machine • The load-torque is assumed constant Chapter 13 DC Motor Drives

  11. DC-Motor Drive: Four-Quadrant Capability • If a diode-rectifier is used, the energy recovered during regenerative braking is dissipated in a resistor Chapter 13 DC Motor Drives

  12. Ripple in the Armature Current • Bi-polar and uni-polar voltage switchings Chapter 13 DC Motor Drives

  13. Control of Servo Drives • A concise coverage is presented in “Electric Drives: An Integrative Approach” by N. Mohan (www.MNPERE.com) Chapter 13 DC Motor Drives

  14. Effect of Blanking Time • Non-linearity is introduced Chapter 13 DC Motor Drives

  15. Converters for Limited Operational Capabilities • Two switches for 2-quadrant operation and only one switch for 1-quadrant operation Chapter 13 DC Motor Drives

  16. Line-Controlled Converters for DC Drives • Large low-frequency ripple in the dc output of converters Chapter 13 DC Motor Drives

  17. Four Quadrant Operation using Line Converters • Two options to achieve 4-quadrant operation Chapter 13 DC Motor Drives

  18. Effect of Discontinuous Current Conduction • Speed goes up unless it is controlled Chapter 13 DC Motor Drives

  19. Open-Loop Speed Control • Adequate for general-purpose applications Chapter 13 DC Motor Drives

  20. DC Drive Characteristics and Capabilities • Line current in switch-mode and line-converter drives Chapter 13 DC Motor Drives

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