Why there is a variation of no load back emf while adopting hairpin?

- June 28, 2023 at 3:12 am
  Sree Ranjini
  Subscriber
  - I am using MOTORCAD for predesign activity for converting IPM configuration with random winding to hairpin
  - Keeping the same input conditions, material, rotor and stator geometry(of course with parallel slots) , same number of turns per phase for both I am observing lower back emf with hairpin
  - What could be the reason for this. Does MOTORCAD takes any special consideration with hairpin winding?
- June 28, 2023 at 8:47 pm
  
  DELI
  Ansys Employee
  
  hi, I will need more information, could you provide screenshots for this issue?
  - June 29, 2023 at 11:50 pm
    
    Sree Ranjini
    Subscriber
    
    I am using IPM machine with D shaped magnets. While adopting random winding with 16 number of turns I have back emf value as 70V. However, Keeping the same number of turns in hairpin (8 layer,4 parallel path) I observe 4% deviation in back emf keeping same magnet temperature, geometry and materials.
    - June 30, 2023 at 5:16 pm
      
      DELI
      Ansys Employee
      
      can you provide pictures of the winding definition page for two winding types?

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