ME 2205 ELECTRICAL DRIVES AND CONTROL
description
Transcript of ME 2205 ELECTRICAL DRIVES AND CONTROL
![Page 1: ME 2205 ELECTRICAL DRIVES AND CONTROL](https://reader035.fdocuments.us/reader035/viewer/2022062302/5681638c550346895dd48023/html5/thumbnails/1.jpg)
ME 2205 ELECTRICAL DRIVES AND CONTROL
UNIT I INTRODUCTION BY
P.VIVEK A.P/EEE
![Page 2: ME 2205 ELECTRICAL DRIVES AND CONTROL](https://reader035.fdocuments.us/reader035/viewer/2022062302/5681638c550346895dd48023/html5/thumbnails/2.jpg)
BASIC ELEMENTS
POWER SUPPLY
CONTROL EQUIPME
NT
ELECTRIC MOTOR
MECHANICAL LOAD
![Page 3: ME 2205 ELECTRICAL DRIVES AND CONTROL](https://reader035.fdocuments.us/reader035/viewer/2022062302/5681638c550346895dd48023/html5/thumbnails/3.jpg)
ELECTRICAL DRIVE
• A UNIT CONSITING OF AN • ELECTRICAL MOTOR• ENERGY TRANSMITTING SHAFT • CONTROL EQUIPMENT
![Page 4: ME 2205 ELECTRICAL DRIVES AND CONTROL](https://reader035.fdocuments.us/reader035/viewer/2022062302/5681638c550346895dd48023/html5/thumbnails/4.jpg)
DRIVE SYSTEM
• COMBINATION OF • ELECTRICAL DRIVE AND CORRESPONDING
LOAD
![Page 5: ME 2205 ELECTRICAL DRIVES AND CONTROL](https://reader035.fdocuments.us/reader035/viewer/2022062302/5681638c550346895dd48023/html5/thumbnails/5.jpg)
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
![Page 6: ME 2205 ELECTRICAL DRIVES AND CONTROL](https://reader035.fdocuments.us/reader035/viewer/2022062302/5681638c550346895dd48023/html5/thumbnails/6.jpg)
TYPES OF ELECTRICAL DRIVES
• GROUP DRIVE
• INDIVIDUAL DRIVE
• MULTIMOTOR DRIVE
![Page 7: ME 2205 ELECTRICAL DRIVES AND CONTROL](https://reader035.fdocuments.us/reader035/viewer/2022062302/5681638c550346895dd48023/html5/thumbnails/7.jpg)
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
![Page 8: ME 2205 ELECTRICAL DRIVES AND CONTROL](https://reader035.fdocuments.us/reader035/viewer/2022062302/5681638c550346895dd48023/html5/thumbnails/8.jpg)
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
![Page 9: ME 2205 ELECTRICAL DRIVES AND CONTROL](https://reader035.fdocuments.us/reader035/viewer/2022062302/5681638c550346895dd48023/html5/thumbnails/9.jpg)
MULTIMOTOR DRIVE
• A SEPARATE MOTOR IS PROVIDED FOR DRIVING THE SEPARATE MECHANISM
• ADVANTAGES • INCREASE THE OVERALL PRODUCTIVITY
![Page 10: ME 2205 ELECTRICAL DRIVES AND CONTROL](https://reader035.fdocuments.us/reader035/viewer/2022062302/5681638c550346895dd48023/html5/thumbnails/10.jpg)
FACTORS AFFECTING THE SELECTION OF DRIVE
• LIMIT OF SPEED RANGE• EFFICIENCY• BRAKING• STARTING REQUIREMENTS• POWER FACTOR• LOAD FACTOR• AVAILABILITY OF SUPPLY • ECONOMICAL ASPECTS
![Page 11: ME 2205 ELECTRICAL DRIVES AND CONTROL](https://reader035.fdocuments.us/reader035/viewer/2022062302/5681638c550346895dd48023/html5/thumbnails/11.jpg)
SELECTION OF MOTOR BASED ON LOAD VARIATION
• CONTINOUS LOAD• CONTINOUS VARIABLE LOAD • PULSATING LOAD• IMPACT LOADS• SHORT TIME INTERMITTENT LOAD• SHORT TIME LOAD
![Page 12: ME 2205 ELECTRICAL DRIVES AND CONTROL](https://reader035.fdocuments.us/reader035/viewer/2022062302/5681638c550346895dd48023/html5/thumbnails/12.jpg)
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
![Page 13: ME 2205 ELECTRICAL DRIVES AND CONTROL](https://reader035.fdocuments.us/reader035/viewer/2022062302/5681638c550346895dd48023/html5/thumbnails/13.jpg)
POWER LOSSES AND HEATING OF MOTOR
• COPPER LOSS • CORE LOSS• POWER LOSSES CAUSE LOCALISED HEATING
AND RESPONSIBLE FOR TEMPERATURE RISE OF THE MOTOR
![Page 14: ME 2205 ELECTRICAL DRIVES AND CONTROL](https://reader035.fdocuments.us/reader035/viewer/2022062302/5681638c550346895dd48023/html5/thumbnails/14.jpg)
STEADY STATE CONDITION
• FINAL TEMPERATURE RISE IS REACHED WHEN THE RATE OF PRODUCTION OF HEAT AND RATE OF HEAT DISSIPATION ARE EQUAL
![Page 15: ME 2205 ELECTRICAL DRIVES AND CONTROL](https://reader035.fdocuments.us/reader035/viewer/2022062302/5681638c550346895dd48023/html5/thumbnails/15.jpg)
CONTINOUS RATING
• CONTINOUS RATING OF A MACHINE IS THAT RATING FOR WHICH THE TEMPERATURE RISE IS JUST BELOW THE PERMISSIBLE VALUE OF TEMPERATURE RISE
![Page 16: ME 2205 ELECTRICAL DRIVES AND CONTROL](https://reader035.fdocuments.us/reader035/viewer/2022062302/5681638c550346895dd48023/html5/thumbnails/16.jpg)
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
![Page 17: ME 2205 ELECTRICAL DRIVES AND CONTROL](https://reader035.fdocuments.us/reader035/viewer/2022062302/5681638c550346895dd48023/html5/thumbnails/17.jpg)
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
![Page 18: ME 2205 ELECTRICAL DRIVES AND CONTROL](https://reader035.fdocuments.us/reader035/viewer/2022062302/5681638c550346895dd48023/html5/thumbnails/18.jpg)
SELECTION OF MOTOR FOR INDUSTRIAL APPLICATIONS
• STEEL ROLLING MILLS • DC MOTOR WITH WARD LEONARD SYSTEM • AC COMMUTATOR MOTORS• ACCURATE TORQUE AND SPEED CONTROL
![Page 19: ME 2205 ELECTRICAL DRIVES AND CONTROL](https://reader035.fdocuments.us/reader035/viewer/2022062302/5681638c550346895dd48023/html5/thumbnails/19.jpg)
CRANES AND HOISTS
• SERIES MOTORS• GOOD STARTING TORQUE• ELECTRIC BRAKING AT LOW SPEED IS POSSIBLE
![Page 20: ME 2205 ELECTRICAL DRIVES AND CONTROL](https://reader035.fdocuments.us/reader035/viewer/2022062302/5681638c550346895dd48023/html5/thumbnails/20.jpg)
TEXTILE INDUSTRY
• MODERATE STARTING TORQUE • CONSTANT SPEED• HIGH TORQUE SQUIRREL CAGE INDUCTION
MOTOR IS PREFFERED
![Page 21: ME 2205 ELECTRICAL DRIVES AND CONTROL](https://reader035.fdocuments.us/reader035/viewer/2022062302/5681638c550346895dd48023/html5/thumbnails/21.jpg)
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
![Page 22: ME 2205 ELECTRICAL DRIVES AND CONTROL](https://reader035.fdocuments.us/reader035/viewer/2022062302/5681638c550346895dd48023/html5/thumbnails/22.jpg)
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
![Page 23: ME 2205 ELECTRICAL DRIVES AND CONTROL](https://reader035.fdocuments.us/reader035/viewer/2022062302/5681638c550346895dd48023/html5/thumbnails/23.jpg)
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
![Page 24: ME 2205 ELECTRICAL DRIVES AND CONTROL](https://reader035.fdocuments.us/reader035/viewer/2022062302/5681638c550346895dd48023/html5/thumbnails/24.jpg)
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
![Page 25: ME 2205 ELECTRICAL DRIVES AND CONTROL](https://reader035.fdocuments.us/reader035/viewer/2022062302/5681638c550346895dd48023/html5/thumbnails/25.jpg)
IMPORTANT QUESTIONS -SIXTEEN MARKS
• PROBLEMS DISCUSSED IN THE CLASS
![Page 26: ME 2205 ELECTRICAL DRIVES AND CONTROL](https://reader035.fdocuments.us/reader035/viewer/2022062302/5681638c550346895dd48023/html5/thumbnails/26.jpg)
COMPARISON BETWEEN AC AND DC DRIVE
S.NO D.C.DRIVE A.C DRIVE
1 SPEED TORQUE CAN BE ACHIEVED EASILY IT IS NOT EASTY TO ADJUST SPEED TORQUE CURVES
2 SELF STARTING NOT SELF STARTING
3 FREQUENT MAINTENANCE IS REQUIRED LESS MAINTENANCE
4 COSTLY CHEAPER
5 RECTIFYING CIRCUIT IS NECESSARY NO NEED
![Page 27: ME 2205 ELECTRICAL DRIVES AND CONTROL](https://reader035.fdocuments.us/reader035/viewer/2022062302/5681638c550346895dd48023/html5/thumbnails/27.jpg)
FOUR QUADRANT OPERATION QUADRANT
POLARITY OF VOLTAGE
POLARITY OF CURRENT
NATURE OF OPERATION
I POSITIVE POSITIVE FORWARD MOTORING
II POSITIVE NEGATIVE FORWARD REGENERATION
III NEGATIVE NEGATIVE REVERSE MOTORING
IV NEGATIVE POSITIVE REVERSE REGENERATION