1 / 27

ME 2205 ELECTRICAL DRIVES AND CONTROL

ME 2205 ELECTRICAL DRIVES AND CONTROL. UNIT I INTRODUCTION BY P.VIVEK A.P/EEE. BASIC ELEMENTS . ELECTRIC MOTOR. POWER SUPPLY. CONTROL EQUIPMENT. MECHANICAL LOAD. ELECTRICAL DRIVE . A UNIT CONSITING OF AN ELECTRICAL MOTOR ENERGY TRANSMITTING SHAFT CONTROL EQUIPMENT. DRIVE SYSTEM.

elden
Download Presentation

ME 2205 ELECTRICAL DRIVES AND CONTROL

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript


  1. ME 2205 ELECTRICAL DRIVES AND CONTROL UNIT I INTRODUCTION BY P.VIVEK A.P/EEE

  2. BASIC ELEMENTS ELECTRIC MOTOR POWER SUPPLY CONTROL EQUIPMENT MECHANICAL LOAD

  3. ELECTRICAL DRIVE • A UNIT CONSITING OF AN • ELECTRICAL MOTOR • ENERGY TRANSMITTING SHAFT • CONTROL EQUIPMENT

  4. DRIVE SYSTEM • COMBINATION OF • ELECTRICAL DRIVE AND CORRESPONDING LOAD

  5. ADVANTAGES • FEASIBLE CONTROL CHARACTERISTICS • AVAILABLE IN WIDE RANGE OF SPEED TORQUE AND POWER • HIGHER EFFICIENCY • LOWER NOISE • CLEANER OPERATION • LOW MAINTENANCE REQUIREMENTS • ELECTRIC ENERGY IS EASY TO TRANSPORT

  6. TYPES OF ELECTRICAL DRIVES • GROUP DRIVE • INDIVIDUAL DRIVE • MULTIMOTOR DRIVE

  7. GROUP DRIVE • DRIVE CONSISTS OF ONLY ONE ELECTRIC MOTOR WHICH DRIVES SEVERAL MACHINES • ADVANTAGE • RATING OF AN ELECTRICAL DRIVE CAN BE SMALLER • DISADVANTAGE • IF ELECTRIC MOTOR IS SUBJECTED TO ANY FAULT ALL THE EQUIPMENTS BECOME IDLE

  8. INDIVIDUAL DRIVE • IF A SINGLE MOTOR IS USED TO DRIVE A SINGLE MACHINE AND ALL THE MECHANISMS BELONGING TO THE SAME MACHINE. • DISADVANTAGE • DUE TO POWER LOSS ,THE EFFICIENCY OF SUCH DRIVE IS ALSO POOR

  9. MULTIMOTOR DRIVE • A SEPARATE MOTOR IS PROVIDED FOR DRIVING THE SEPARATE MECHANISM • ADVANTAGES • INCREASE THE OVERALL PRODUCTIVITY

  10. FACTORS AFFECTING THE SELECTION OF DRIVE • LIMIT OF SPEED RANGE • EFFICIENCY • BRAKING • STARTING REQUIREMENTS • POWER FACTOR • LOAD FACTOR • AVAILABILITY OF SUPPLY • ECONOMICAL ASPECTS

  11. SELECTION OF MOTOR BASED ON LOAD VARIATION • CONTINOUS LOAD • CONTINOUS VARIABLE LOAD • PULSATING LOAD • IMPACT LOADS • SHORT TIME INTERMITTENT LOAD • SHORT TIME LOAD

  12. CLASSES OF DUTY AND SELECTION OF RATING OF MOTOR • ONCE CYCLE OF VARIATION OF LOAD IS DUTY • CONTINOUS DUTY • CONTINOUS DUTY,VARIABLE LOAD • SHORT TIME DUTY • INTERMITTENT PERIODIC DUTY • INTERMITTENT PERIODIC DUTY WITH STARTING • INTERMITTENT PERIODIC DUTY WITH STARTING AND BRAKING

  13. POWER LOSSES AND HEATING OF MOTOR • COPPER LOSS • CORE LOSS • POWER LOSSES CAUSE LOCALISED HEATING AND RESPONSIBLE FOR TEMPERATURE RISE OF THE MOTOR

  14. STEADY STATE CONDITION • FINAL TEMPERATURE RISE IS REACHED WHEN THE RATE OF PRODUCTION OF HEAT AND RATE OF HEAT DISSIPATION ARE EQUAL

  15. CONTINOUS RATING • CONTINOUS RATING OF A MACHINE IS THAT RATING FOR WHICH THE TEMPERATURE RISE IS JUST BELOW THE PERMISSIBLE VALUE OF TEMPERATURE RISE

  16. HEATING AND COOLING CURVES • A SMALLER TIME CONSTANT IS OBTAINED FOR GOOD VENTILATION • THE TIME CONSTANT IS INVERSELY PROPORTIONAL TO SPECIFIC HEAT DISSIPATION • COOLING TIME CONSTANT IS THE TIME REQUIRED TO COOL THE MACHINE

  17. SELECTION OF POWER RATING FOR DRIVE MOTORS • CONTINOUS LOAD • CONTINOUS RATING SPECIFIES THE MAXIMUM LOAD THAT THE MOTOR CAN TAKE OVER A PERIOD FOR TIME • CONTINOUS VARIABLE LOAD • CLASS OF DUTY IS SELECTED ON BASED ON AVERAGE POWER OR CURRENT

  18. SELECTION OF MOTOR FOR INDUSTRIAL APPLICATIONS • STEEL ROLLING MILLS • DC MOTOR WITH WARD LEONARD SYSTEM • AC COMMUTATOR MOTORS • ACCURATE TORQUE AND SPEED CONTROL

  19. CRANES AND HOISTS • SERIES MOTORS • GOOD STARTING TORQUE • ELECTRIC BRAKING AT LOW SPEED IS POSSIBLE

  20. TEXTILE INDUSTRY • MODERATE STARTING TORQUE • CONSTANT SPEED • HIGH TORQUE SQUIRREL CAGE INDUCTION MOTOR IS PREFFERED

  21. COAL AND MINNING INDUSTRY • COAL CUTTING OR DRILLING REQUIRES COSTANT SPEED AND HIGH STARTING TORQUE • SQUIRREL CAGE MOTORS ARE PREFFERED • CENTRIFUGAL PUMPS ARE USED IN MINNING FOR PUMPING WATER. • HIGH TORQUE SQUIRREL CAGE ARE SELECTED

  22. IMPORTANT QUESTIONS -TWO MARKS • DRAW THE FUNCTIONAL FUNCTIONAL DIAGRAM OF AN ELECTRICAL DRIVE SYSTEM • GIVE ANY TWO FACTORS THAT INFLUENCE THE CHOICE OF ELECTRICAL DRIVES • MENTION THE USAGE OF DIFFERENT TYPES OF MOTORS WITH APPLICATION IN TEXTILE MILL • WHAT IS MEANT INTERMITTENT DUTY • LIST ANY FOUR ADVANTAGES OF ELECTRIC DRIVES

  23. IMPORTANT QUESTIONS -TWO MARKS • WHAT IS MEANT BY ELECTRIC DRIVE • DEFINE CONTINOUS RATING OF A MOTOR • WHAT IS OVERLOAD CURRENT CAPABILITY OF MOTOR • DEFINE COOLING TIME CONSTANT OF A MACHINE • NAME ANY FOUR CLASSES OF DUTY

  24. IMPORTANT QUESTIONS -SIXTEEN MARKS • DERIVE AN EXPRESSION FOR A THERMAL MODEL OF MOTOR FOR HEATING AND COOLING.ALSO DRAW THE HEATING AND COOLING CURVE • EXPLAIN THE DIFFERENT CLASSES OF MOTOR DUTY WITH NEAT SKETCH • EXPLAIN THE VARIOUS FACTORS INFLUENCING THE CHOICE OF ELECTRICAL DRIVE

  25. IMPORTANT QUESTIONS -SIXTEEN MARKS • PROBLEMS DISCUSSED IN THE CLASS

  26. COMPARISON BETWEEN AC AND DC DRIVE

  27. FOUR QUADRANT OPERATION

More Related