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Controlled-Rectifier Fed Drive

Controlled-Rectifier Fed Drive. Armature Field. Chopper-Fed Drive. Armature Field. Equivalent Circuit of a Separately-Excited DC Motor. Solve for the motor speed. Control of the motor speed. Control armature voltage, V a Voltage control Control the field current, I f

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Controlled-Rectifier Fed Drive

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  1. Controlled-Rectifier Fed Drive Armature Field ECE 442 Power Electronics

  2. Chopper-Fed Drive Armature Field ECE 442 Power Electronics

  3. Equivalent Circuit of a Separately-Excited DC Motor ECE 442 Power Electronics

  4. ECE 442 Power Electronics

  5. ECE 442 Power Electronics

  6. Solve for the motor speed ECE 442 Power Electronics

  7. Control of the motor speed • Control armature voltage, Va • Voltage control • Control the field current, If • Current control • Control the armature current, Ia ECE 442 Power Electronics

  8. Magnetization Characteristic ECE 442 Power Electronics

  9. Characteristics of Separately-Excited Motors Use armature voltage control Use field-current control Rated speed ECE 442 Power Electronics

  10. Equivalent circuit of a DC Series Motor ECE 442 Power Electronics

  11. ECE 442 Power Electronics

  12. Controlling the Motor Speed • Control the armature voltage, Va • Control the armature current, Ia ECE 442 Power Electronics

  13. Characteristics of DC Series motors ECE 442 Power Electronics

  14. Operating Modes • In variable-speed applications, a dc motor may be operating in one or more of the following “Modes” • Motoring • Regenerative braking • Dynamic braking • Plugging ECE 442 Power Electronics

  15. Motoring Mode “Back emf”, Eg is < supply voltage Va Both Ia and If are positive Developed torque meets load demand ECE 442 Power Electronics

  16. Regenerative Braking Mode Motor acts as a Generator Eg becomes > supply Voltage Va Ia becomes negative Kinetic energy of the motor is returned to the supply ECE 442 Power Electronics

  17. Dynamic Braking Replace the supply voltage with a resistor Power dissipated in the resistor rather than given back to the source ECE 442 Power Electronics

  18. Plugging Reverse the armature terminals while running Va and Eg act in the same direction Ia is reversed, producing “braking” torque ECE 442 Power Electronics

  19. Four-Quadrant Operation ECE 442 Power Electronics

  20. Single-Phase DC Drive Change Va by changing firing angle  Inductor Lm is a “smoothing” Inductor to prevent discontinuous current ECE 442 Power Electronics

  21. Armature Reversal ECE 442 Power Electronics

  22. Field Reversal ECE 442 Power Electronics

  23. Single-Phase Half-Wave Converter Drive ECE 442 Power Electronics

  24. Quadrant of Operation ECE 442 Power Electronics

  25. Waveform Summary ECE 442 Power Electronics

  26. Single-Phase Semiconverter Drives ECE 442 Power Electronics

  27. Quadrant(s) of Operation Semiconverter – one quadrant converter One polarity of output voltage and current ECE 442 Power Electronics

  28. Waveform Summary ECE 442 Power Electronics

  29. Single-Phase Full-Converter Drives ECE 442 Power Electronics

  30. Quadrant(s) of Operation Full converter – two quadrant converter Output voltage polarity can be positive or negative Output current has one polarity ECE 442 Power Electronics

  31. Waveform Summary ECE 442 Power Electronics

  32. Single-Phase Dual-Converter Drives Dual converter can operate in all four quadrants Output voltage and current can be positive or negative ECE 442 Power Electronics

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