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REDUCTION OF COGGING TORQUE IN PERMANENT MAGNET MACHINE Krithik Kumar Chandrashekar, Nikhil Kulkarni
What is Cogging Torque and Why reduce it  ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
An overview of Methods for Reduction ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Base Model Design Parameter Value Stator Outer Radius 70mm Stator Inner Radius 29mm Rotor Inner Diameter 23.5mm Magnet Height 4 mm  Stator Slot opening 3mm Pole Shoe depth 2mm Pole Width 20 mm Speed  1800 rpm Torque  ~4-5 Nm
Parameters for the Base Model
Shaping The permanent Magnet ,[object Object],[object Object],[object Object]
Lengthening the Air gap ,[object Object],[object Object],[object Object]
Auxiliary Groove  ,[object Object],[object Object],[object Object],[object Object]
Skewed Rotor  ,[object Object],[object Object],[object Object]
Skewed Rotor And Stator ,[object Object],[object Object],[object Object]
Slot less stator ,[object Object],[object Object],[object Object],[object Object],[object Object]
Asymmetrical Permanent magnets ,[object Object],[object Object],[object Object],[object Object],[object Object]
Changing number of stator slots ,[object Object],[object Object],[object Object],[object Object]
Odd number of stator slots ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Skewing of stator teeth ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Shifting permanent magnets axially ,[object Object],[object Object],[object Object]
Comparison Of Some of The Techniques Model Number  Average Torque (Nm) Cogging Torque(Nm) Base Model 5.038 0.2053 1. Slotless 5.024 0.1175 2. Bread Loaf 3.8789 0.0223 3.Assymetry 4.9612 0.1628 4.Airgap Lengthening 4.5717 0.1712 5.Auxillary Groove 4.775 0.1066
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Reduction of cogging torque in permanent magnet machine

  • 1. REDUCTION OF COGGING TORQUE IN PERMANENT MAGNET MACHINE Krithik Kumar Chandrashekar, Nikhil Kulkarni
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  • 4. Base Model Design Parameter Value Stator Outer Radius 70mm Stator Inner Radius 29mm Rotor Inner Diameter 23.5mm Magnet Height 4 mm Stator Slot opening 3mm Pole Shoe depth 2mm Pole Width 20 mm Speed 1800 rpm Torque ~4-5 Nm
  • 5. Parameters for the Base Model
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  • 15.
  • 16.
  • 17. Comparison Of Some of The Techniques Model Number Average Torque (Nm) Cogging Torque(Nm) Base Model 5.038 0.2053 1. Slotless 5.024 0.1175 2. Bread Loaf 3.8789 0.0223 3.Assymetry 4.9612 0.1628 4.Airgap Lengthening 4.5717 0.1712 5.Auxillary Groove 4.775 0.1066