Drives

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Drives

  1. 1. ELECTRICAL DRIVES
  2. 2. <ul><li>Systems that employ motion control is called Drive. </li></ul><ul><li>Employs prime movers such as diesel or petrol engines, steam turbines, hydraulic motors and electric motors. </li></ul><ul><li>Drives employing electric motors are known as Electrical drives . </li></ul>ELECTRICAL DRIVES
  3. 3. <ul><li>Flexible control characteristics. </li></ul><ul><li>Available in wide range of speed, torque and power. </li></ul><ul><li>Longer life, lower noise, lower maintenance, and cleaner operation. </li></ul><ul><li>Adaptable to any operating conditions. </li></ul><ul><li>Do not pollute the environment. </li></ul><ul><li>Can operate in all four quadrants of speed-torque plane. </li></ul><ul><li>There is no need to refuel or warm-up the motor. </li></ul><ul><li>Powered by electrical energy which as a number of advantages. </li></ul>Advantages of electrical Drives
  4. 4. <ul><li>Bulky </li></ul><ul><li>Inefficient </li></ul><ul><li>inflexible </li></ul>Classic Electrical Drive for Variable Speed Application :
  5. 5. Power Electronic Converters Typical Modern Electric Drive Systems Load Motor Controller Reference POWER IN feedback Power Electronic Converters Electric Energy - Unregulated - Electric Energy - Regulated - Electric Motor Electric Energy Mechanical Energy
  6. 6. Example on VSD application Constant speed Variable Speed Drives motor pump valve Supply Power In Power loss Mainly in valve Power out
  7. 7. Constant speed Variable Speed Drives Example on VSD application Power In Power loss Mainly in valve Power out motor pump valve Supply motor PEC pump Supply Power In Power loss Power out
  8. 8. Constant speed Variable Speed Drives Example on VSD application Power In Power loss Mainly in valve Power out Power In Power loss Power out motor pump valve Supply motor PEC pump Supply
  9. 9. Electric motor consumes more than half of electrical energy in the US Fixed speed Variable speed HOW ? Improvements in energy utilization in electric motors give large impact to the overall energy consumption Replacing fixed speed drives with variable speed drives Using the high efficiency motors Improves the existing power converter–based drive systems Example on VSD application
  10. 10. DC drives : Electrical drives that use DC motors as the prime mover Regular maintenance, heavy, expensive, speed limit AC drives : Electrical drives that use AC motors as the prime mover Less maintenance, light, less expensive, high speed Overview of AC and DC drives Easy control, decouple control of torque and flux Coupling between torque and flux – variable spatial angle between rotor and stator flux
  11. 11. Overview of AC and DC drives Extracted from Boldea & Nasar

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