Fractional-slot concentrated winding machines and drives

Fractional-slot concentrated winding machines and drives

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Fractional -slot concentrated -wound AC machines have undergone intensive research and development recently due their compactness, ease of manufacturing and maintenance, and low cost compared to conventional AC machines. Many new applications in appliances, electric traction, and aerospace industries are already possible. These machines pose some control challenges due to the high number of poles, which can be taken advantage of in gearless drives, and the non -sinusoidal nature of its stator MMF. This chapter is focused on the design and performance aspects of the fractional-slot concentrated-wound machines.

Chapter Contents:

  • 17.1 Definition of fractional-slot concentrated windings
  • 17.2 Advantages of using concentrated windings
  • 17.3 Challenges involved in using FSCW
  • 17.4 Three-phase structures that can support FSCW
  • 17.5 Comparison of SL and DL configurations
  • 17.6 Criteria for choosing the optimum slot/pole combination
  • 17.7 How to determine the winding layout
  • 17.8 Calculation of the winding factor
  • 17.8.1 EMF method
  • 17.8.2 Winding function method
  • 17.8.3 Closed-form expressions
  • Calculating distribution factor for fractional-slot windings
  • Calculating pitch factor for fractional-slot windings
  • 17.8.4 Example of winding factor calculation using three methods
  • Using the EMF method
  • Using the winding function method
  • Using closed-form expressions
  • 17.9 Design and analysis
  • 17.10 Flux weakening
  • 17.10.1 Same magnet flux linkage constraint
  • 17.10.2 Inductance calculations
  • 17.11 Losses in electrical machines equipped with FSCW
  • 17.11.1 Rotor losses
  • 17.11.2 End losses
  • 17.11.3 AC losses in the windings
  • 17.11.4 Loss reduction
  • 17.12 Fault tolerance
  • 17.13 Comparison of SPM versus IPM
  • 17.14 Axial-flux, tubular, and flux-switching machines
  • 17.15 Induction machines
  • 17.16 Parasitic effects
  • 17.17 Commercial applications and future evolution of research
  • 17.18 Summary
  • List of symbols
  • Glossary of terms
  • References

Inspec keywords: AC machines

Other keywords: stator MMF; electric traction; appliances; fractional-slot concentrated-wound AC machines; fractional-slot concentrated winding machines; aerospace industries; gearless drives

Subjects: a.c. machines

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