This work presents on the prototyping, and testing of a high speed outer rotor surface permanent motor. The motor uses non-heavy rare earth permanent magnets and operates at a rated speed of 6000rpm. In-slot ceramic heat exchangers are utilized for the cooling of the windings. The external rotor configuration of the motor leaves a significant amount of space in the stator bore, which is leveraged for the integration of the power electronics. This leads to a number of challenges which are discussed in this paper. Simulation and experimental results are presented.
