Radial Force Analytic Modeling for a Novel Bearingless Switched Reluctance Motor When Considering Rotor Eccentricity |
| |
| Authors: | Xilian Wang Baoming Ge Jin Wang Fernando J T E Ferreira |
| |
| Affiliation: | 1. School of Electrical Engineering, Beijing Jiaotong University, Beijing, China;2. Department of Electrical and Computer Engineering, Ohio State University, Ohio, USA;3. Department of Electrical Engineering, Polytechnic Institute of Coimbra (IPC/ISEC), Coimbra, Portugal |
| |
| Abstract: | Abstract—Analytic modeling of radial forces is proposed for the novel bearingless switched reluctance motor, where the rotor eccentricity is taken into account. The novel bearingless switched reluctance motor's model is never disclosed, even though there are many advantages, such as fewer suspension windings and simpler control circuit and algorithm, when compared to the conventional bearingless switched reluctance motor. The analytic model of radial forces is very important to achieve this new bearingless switched reluctance motor's suspension control. The rotor eccentricity is a key cause to affect the radial forces. This article calculates the air-gap permeances through considering rotor eccentricity. The self-inductance and mutual-inductance expressions of the motor torque windings and the suspension windings are derived by using the magnetic equivalent circuit method. The derived radial force model discloses the effects of winding currents, rotor position angle, and rotor eccentricity displacement. The finite-element analysis based results verify the built model. |
| |
| Keywords: | bearingless motor switched reluctance motor rotor eccentricity analytic model finite-element analysis |
|
|
