Theoretical and technological aspects on the inverse structure in the fields of high speed electric machines

The paper presents design and technological aspects of high speed electrical machines including the radial and axial mechanical stress due to centrifugal forces. It presents a reversed structure with outside rotor and inside stator, with high rotational speed, 20.000 rpm -24.000 rpm, with 1kW power, witch serves as centrifugal fan. This unconventional type of machine is now, still in the phase of specific tests.