An887, ac induction Motor Fundamentals

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11/24/03
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Document Outline

• Introduction
• Basic Construction and Operating Principle
  • Stator
    • FIGURE 1: A Typical Stator
  • Rotor
  • Speed of an Induction Motor
    • EQUATION 1:
    • EQUATION 2:
    • FIGURE 2: A Typical Squirrel Cage Rotor
• Types of AC Induction Motors
  • Single-Phase Induction Motor
    • FIGURE 3: Single-Phase AC Induction Motor With and Without a Start Mechanism
  • Split-Phase AC Induction Motor
    • FIGURE 4: Typical Split-Phase AC Induction Motor
  • Capacitor Start AC Induction Motor
    • FIGURE 5: Typical Capacitor Start Induction Motor
  • Permanent Split Capacitor (Capacitor Run) AC Induction Motor
    • FIGURE 6: Typical PSC Motor
  • Capacitor Start/Capacitor Run AC Induction Motor
    • FIGURE 7: Typical Capacitor Start/Run Induction Motor
  • Shaded-Pole AC Induction Motor
    • FIGURE 8: Typical Shaded-Pole Induction Motor
    • FIGURE 9: Torque-Speed Curves of Different Types of Single-Phase Induction Motors
• Three-Phase AC Induction Motor
  • Squirrel Cage Motor
  • Wound-Rotor Motor
    • FIGURE 10: Typical Wound-Rotor Induction Motor
• Torque Equation Governing Motor Operation
  • EQUATION 3:
  • EQUATION 4:
  • FIGURE 11: Typical Torque-Speed Curve of 3-Phase AC Induction Motor
• Starting Characteristic
• Running Characteristic
• Load Characteristic
  • FIGURE 12: Torque-Speed Curve – Same Motor with Two Different Loads
  • Constant Torque, Variable Speed Loads
    • FIGURE 13: Constant Torque, Variable Speed Loads
  • Variable Torque, Variable Speed Loads
    • FIGURE 14: Variable Torque, Variable Speed Loads
  • Constant Power Loads
    • FIGURE 15: Constant Power Loads
  • Constant Power, Constant Torque Loads
    • FIGURE 16: Constant Power, Constant Torque Loads
  • High Starting/Breakaway Torque Followed by Constant Torque
    • FIGURE 17: High Starting/ Breakaway Torque Followed by Constant Torque
• Motor Standards
  • NEMA
  • IEC
    • FIGURE 18: Torque-Speed Curves of Different NEMA Standard Motors
    • TABLE 1: Motor Duty Cycle Types as per IEC Standards
• Typical Name Plate of an AC Induction Motor
  • FIGURE 19: A Typical Name Plate
  • TABLE 2: Name Plate Terms and Their Meanings
• Need for the Electrical Drive
• Variable Frequency Drive (VFD)
  • FIGURE 20: Typical VFD
  • FIGURE 21: V/f Curve
  • VFD as Energy Saver
    • FIGURE 22: Typical Centrifugal Pump Characteristics
    • EQUATION 5:
    • FIGURE 23: Characteristic of Centrifugal Pump with Load – With and Without VFD
• Control Techniques
  • Scalar Control
  • Vector Control
  • Direct Torque Control (DTC)
    • FIGURE 24: DTC Block Diagram
• Summary
• Worldwide Sales and Service