1. Chen, Z.: Principles and Application of Brushless DC Motors. China Machine Press, Beijing (2004)
2. Bosch, R.: Development of a Bearingless Electric Motor. In: Proc. of Int. Conf. Electric Machines, Pisa, pp. 373–375 (1988)
3. Salazar, A., Chiba, A., Fukao, T.: A Review of Developments in Bearingless Motors. In: 7th International Symposium on Magnetic Bearings, Zurich, pp. 335–401 (2000)
4. Fengxiang, W., Jiqiang, W., Zhiguo, K.: Study on Brushless DC Motor with Passive Magnetic Bearings. Proceedings of the CSEE 24, 94–99 (2004)
5. Ooshima, M.: Analyses of Rotational Torque and Suspension Force in a Permanent Magnet Synchronous Bearingless Motor with Short-pitch Winding. In: Power Engineering Society General Meeting, Florida, pp. 1–7 (2007)