About the design of very high frequency induction motors for spindle applications

Induction motors used in electrical spindles and fed by high-frequency inverters are considered. The design problems of high-frequency machines are analyzed from the electromagnetic, mechanical, and thermal points of view. The possibility of using the classical relations adopted to calculate the equivalent circuit parameters for standard motors at 50 Hz is examined, and the results are compared with experimental ones. A brief overview of problems related to the mechanical design (bearings, lubrication, and shaft stiffness) and to the thermal design is presented. Finally, based on simulation and experimental results, some specific criteria for the electromagnetic design are developed