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Electric motors

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TYPES OF MOTORS,MOTOR LOSSES

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Electric motors

  1. 1. Electric motors Presented at MESCE KUTTIPPURAM 1
  2. 2. Over view • Electric motors • Types of electric motors • Losses in induction machines • Motor efficiency • Energy efficient motor 2
  3. 3. ELECTRIC MOTORS • Convert electric energy to mechanical energy • Operate by the interaction between magnetic field and winding current • Operate in both motoring and braking mode • Use in industrial fans ,pumps, machine tools etc.. 3
  4. 4. Types of electric motors AC MOTOR DC MOTOR 4
  5. 5. AC MOTORS Induction motor Synchronous motor 5
  6. 6. Induction motor Three phaseSingle phase 6
  7. 7. 7 DC MOTOR • Permanent magnet DC motor • Separately excited DC motor • Series field wound DC motor • Shunt field wound DC motor • Compound motor
  8. 8. 8 Losses in induction machines • Electrical losses due to heat produced in the stator and rotor winding (copper losses) • Magnetic loss in the iron due to hysteresis and eddy current • Mechanical loss due to friction in the bearing and ventilation • Stray load losses
  9. 9. Losses in Induction motor Variable losses Fixed losses 9
  10. 10. Constant Losses Iron or Core loss Mechanical loss 10
  11. 11. Iron losses Eddy current losses Hysteresis losses 11
  12. 12. 12 Mechanical losses • Due to friction in the bearing and ventilation • This losses vary slightly with load and speed • This variation are considered to be negligible
  13. 13. Variable losses Stator copper loss Rotor copper loss 13
  14. 14. Motor Efficiency • Ratio between the shaft power out put to the electrical input • Ƞ = P out/P in • Ƞm = (Pout )(746)/Pin when Pout in hP 14
  15. 15. Energy Efficient motors • 2 to 8 percentage more efficiency than the standard motor • Same out put by consuming lesser amount of power • Achieved by 1. More copper in the winding 2. Reduced fan loss 3. Higher quality thinner steel lamination 4. Optimal air gap between rotor and stator 5. Greater length high quality aluminum used in the rotor frame 15
  16. 16. 16 THANK YOU

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