Fractional-slot concentrated winding machines and drives

Abstract

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.