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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.

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ME 2205 ELECTRICAL DRIVES AND CONTROL

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  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

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