Analysis of the effect of radial rotor surface grooves on rotor losses of high speed solid rotor induction motor

The effect of the radial rotor surface grooves on rotor losses, in the case of a 3-phase, 4-pole, 24000 rpm, axially slitted solid rotor induction motor has been studied numerically and experimentally. The study shows that through radial grooving of the rotor outer surface and thereby cutting the path for high frequency rotor harmonic currents results in considerable reduction of the rotor eddy current losses. In 2D FEM analysis the grooves are considered by correcting the rotor conductivity in harmonic currents penetration depth area.