A 150 000-r/min Bearingless Slice Motor

In this paper, the design and operating principle of a slotless bearingless slice motor for high rotational speeds are presented. The performance of the proposed concept is evaluated using an experimental prototype. Measurement results demonstrate a stable dynamic behavior during acceleration and an achievable rotational speed of 150 000 r/min, which is, to the knowledge of the authors, the highest rotational speed attained by a bearingless slice motor to date. The system performance is outlined at its maximum speed, and power loss measurements are carried out over the entire speed range.