Axially slitted, high-speed solid-rotor induction motor technology with copper end-rings

In high-speed applications the mechanical strength of a solid rotor induction motor is recognized as a significant benefit. The performances of a 4-pole and a 2-pole solid-rotor induction machines for 29100 min^-1 are analyzed numerically and compared with the measured performance of a permanent magnet synchronous motor of the same active volume. The 3-phase, 4-pole, axially slitted prototype solid rotor induction motor with copper end rings is constructed and tested. The simulation results show that a 2-pole solid rotor induction motor has a larger torque density and is a better candidate for high speed drives.