Electricmotors

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EXPERT SYSTEMS AND SOLUTIONS
Project Center For Research in Power Electronics and Power Systems
IEEE 2010 , IEEE 2011 BASED PROJECTS FOR FINAL YEAR STUDENTS OF B.E
Email: expertsyssol@gmail.com,
Cell: +919952749533, +918608603634
www.researchprojects.info
OMR, CHENNAI
IEEE based Projects For
Final year students of B.E in
EEE, ECE, EIE,CSE
M.E (Power Systems)
M.E (Applied Electronics)
M.E (Power Electronics)
Ph.D Electrical and Electronics.
Training
Students can assemble their hardware in our Research labs. Experts will be guiding the projects.
EXPERT GUIDANCE IN POWER SYSTEMS POWER ELECTRONICS
We provide guidance and codes for the for the following power systems areas.
1. Deregulated Systems,
2. Wind power Generation and Grid connection
3. Unit commitment
4. Economic Dispatch using AI methods
5. Voltage stability
6. FLC Control
7. Transformer Fault Identifications
8. SCADA - Power system Automation

we provide guidance and codes for the for the following power Electronics areas.
1. Three phase inverter and converters
2. Buck Boost Converter
3. Matrix Converter
4. Inverter and converter topologies
5. Fuzzy based control of Electric Drives.
6. Optimal design of Electrical Machines
7. BLDC and SR motor Drives

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Electricmotors

  1. 1. EXPERT SYSTEMS AND SOLUTIONS Email: expertsyssol@gmail.com expertsyssol@yahoo.com Cell: 9952749533 www.researchprojects.info PAIYANOOR, OMR, CHENNAI Call For Research Projects Final year students of B.E in EEE, ECE, EI, M.E (Power Systems), M.E (Applied Electronics), M.E (Power Electronics) Ph.D Electrical and Electronics.Students can assemble their hardware in our Research labs. Experts will be guiding the projects.
  2. 2. Stepper Motors
  3. 3. Stepper Motor A stepper motor is a motor that moves in steps . A stepper motor is one whose shaft moves in precise angular increments for each electrical input. Typical step sizes are 2°, 2.5° ,3°, 7.5° , 15°, 30°.
  4. 4. Stepper Motor… salient poles on both stator and rotor. The stator poles are wound with coils which carry relatively long pulses of current. The rotor poles are made from either magnetically soft or hard iron. Ns always different from Nr.
  5. 5. Stepper motor operation Step angle β angle through which motor shaft rotates for each command pulse β = (Ns~Nr)*360 / (Ns*Nr) or β = 360 / (m*Nr) where Ns=No. of stator poles (teeth) Nr=No. of rotor poles (teeth) m=No. of phases Displacement = β * No of control pulses (Rotation) Speed =(60*f) / SR rpm step resolution SR=360 / β step/rev
  6. 6. Comparison to Servo Motors Servo Motor Stepper MotorPosition Control Position Control require some form of  often open loopanalog feedback not subject to this  at high accelerationsproblem with variable loads, all rotor information is lost, and closed loop is required for accurate control
  7. 7. Types of Stepper Motors Permanent Magnet Variable Reluctance Hybrid
  8. 8. Permanent Magnet Stepper motors Rotor is made of permanent magnetic Material No teeth on rotor No freewheeling more torque during rotation Less acceleration Difficult to make small step pm rotors with a large number of poles. i.e. step sizes are limited to 30° - 90°.
  9. 9. Permanent Magnet Stepper motors… Full Stepping A-C 0˚ B-D 90˚ Half stepping A-C 0˚ A-C,B-D 45˚ B-D 90˚
  10. 10. Variable Reluctance Stepper motors No permanent magnet Free wheeling possible A - 0˚ C - 15˚ B - 30˚
  11. 11. Variable Reluctance Stepper motors….less torque
  12. 12. Hybrid Stepper motors A hybrid stepping motor has characteristics of both PM and VR motors the rotor is a permanent magnet but has blades like VR motors Rotor is magnetised axially to create the poles motor has very high torque and very small, precise step increments
  13. 13. Hybrid Stepper motors
  14. 14. Hybrid Stepper motors….200 rotor teeth and rotate at 1.80 step angles.Also available in 0.9ºand3.6º step angleconfigurations.used in a wide variety ofindustrial applications.
  15. 15. Full step Mode• One phase is energized at a time
  16. 16. Full step Mode
  17. 17. Full step ModeAnimation shows how coils are energized for full steps
  18. 18. Half Step mode
  19. 19. Half Step mode the second phase is turned on before the first phase is turned off. Thus, sometimes both phases are energized at the same time. During the half-steps the rotor is held in between the two full-step positions. A half-step motor has twice the resolution of a full step motor. Fast response Absence of detent torque
  20. 20. Half Step mode
  21. 21. Micro Stepping Mode Smooth and low speed operation with high resolution Printing, photo type setting A – constant B –increased by very small increments till 1 or max. A -decreased by very B – constant small steps till 0 or min
  22. 22. Advantages They produce the highest torque at low speeds holding torque (not present in DC motors) Rotor has no winding, commutator or brushes – quite, robust and reliable operation
  23. 23. Applications Precise positioning and speed control Open loop position control Torque : 1µNm to 40 Nm Power : 1w to 2500w
  24. 24. Applications Film Drive Optical Scanner Printers ATM Machines Computer peripherals IC fabrication
  25. 25. Applications robotics digital control systems tape drivers disk drives tool positioning process control X-Y recorders

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