Accurate Modeling of Radial Suspension Force on AC Magnetic Bearings

This paper presents a new modeling method based on Maxwell tensor method for radial suspension forces of AC magnetic bearing. Comparing existing method, the invention explicitly designed for AC magnetic bearing is more accurate. Take the AC hybrid magnetic bearing (AC HMB) for example, this paper presents the mathematically modeling process of radial suspension forces with the proposed method. In a comparison of the model established by equivalent magnetic circuit method and by the proposed method, the high uniformity is revealed in its expression form (the only difference is the coefficient between them). To illustrate the precision of the proposed modeling approach, relevant verification experiment are designed and conducted. Indeed, the experimental results show that the proposed modeling method is more accurate than the traditional method (equivalent magnetic circuit method).