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S peed E stimation of I nduction M otors with R otor S lot H armonics

5 th International Scientific Conference on Energy and Climate Change. S peed E stimation of I nduction M otors with R otor S lot H armonics. Alfred PJETRI Ymer LUGA Myrteza BRANESHI Astrit BARDHI. 11-12 October 2012, Athens Greece. Rotor Speed Monitoring in Induction Motors.

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S peed E stimation of I nduction M otors with R otor S lot H armonics

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  1. 5th International Scientific Conference on Energy and Climate Change Speed Estimation of Induction Motors with Rotor Slot Harmonics Alfred PJETRI Ymer LUGA Myrteza BRANESHI AstritBARDHI 11-12 October 2012, Athens Greece

  2. Rotor Speed Monitoring in Induction Motors • Conventional Techniques (Mechanical Speed Sensor ) • Mathematical Model of IM (MRAS) • Rotor Slot Harmonics SENSORLESS

  3. ConventionalTechniques • D.C. Tachogenerators • A.C. Tachogenerators • Encoders • Resolvers Mechanical Sensors

  4. Increase the cost of control system • Gives errors because of mounting • Vibration • Ingress of contaminant • Reduces the system reliability

  5. SensorleesTechniques • Mathematical Model of IM (MRAS) • Rotor Slot Harmonics SENSORLESS

  6. Mathematical Model Sensorlees Techniques Disadvantages • Nonlinearity of Magnetic Circuit • Rotor and Stator Resistance Variation with Temperature

  7. Air Gap Flux of Induction Machines

  8. Air Gap Flux of Induction Machines

  9. Air Gap Flux of Induction Machines

  10. E.m.f. induced in stator winding.

  11. Analysis of Rotor Slot Harmonics.

  12. Analysis of Rotor Slot Harmonics.

  13. Signal Measurement for Rotor Slot Harmonics

  14. Fundamental frequency of voltage signal Induction Motor Rotor Speed in RPM

  15. Eksperimental Setup Stand

  16. Experimental Results Estimated 1490 rpm Measured 1492 rpm

  17. Experimental Results Estimated 1466 rpm Measured 1469 rpm

  18. Experimental Results Estimated 1431 rpm Measured 1430 rpm

  19. Comparison of measured and estimated speed

  20. INDUCTION MOTOR RATED DATA Number of rotor slots Zr=46

  21. CONCLUSIONS • Does not need mechanical sensor • Maintenance free • It is not affected by environment • Do not depend of motor parameters • Simple and robust method

  22. THANK YOU

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