Design of high-speed induction machine for the 6 kW, 120 000 rpm helium turbo-circulator

High-speed ranging requires various equipment, for example compressors, turbo-compressors and turbo-circulators nowadays. Solutions using electrical drive with gearboxes is limited by technical feasibility, lifetime and maintenance of gearbox systems. Thanks to development of frequency converters is possible to build direct high-speed electrical drive. This paper is dealing with design of high-speed solid rotor cage induction machine for running 6 kW, 120 000 rpm helium turbo-circulator. Design of high speed electrical machine for TC is described from requirement specification to manufacturing. Results of mechanical, electromagnetic and thermal calculations are given. Proposed design approached can be used in various application in which high speed electrical machine is required.