Design and optimization of an axially-slitted high-speed solid rotor induction motor

Axially-Slitted Solid Rotor Induction Motor (ASSRIM) has a better electric and electromagnetic performance in comparison to Smooth Solid Rotor Induction Motor (SSRIM) in high-speed drive application. A better flux penetration into rotor and increased rotor cooling capability can be performed with axial slits on rotor. The main drawbacks of the axially slits are decreased rotor bending resistance and increased air friction losses. In this study, 20.5 kW, 23600 min−1 high-speed ASSRIM is designed and geometric design parameters of slits such as slit depth and width are optimized by finite element method (FEM). In order to determine optimal geometrical parameters, desired parameters are changed in order; others are kept constant while one is being optimized. 2D transient magnetic model is used for optimization.