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Mathematical Problems in Engineering
Volume 2014 (2014), Article ID 101626, 12 pages
http://dx.doi.org/10.1155/2014/101626
Research Article

Design and Characteristic Analysis of a Novel Bearingless SRM considering Decoupling between Torque and Suspension Force

1College of Automation Engineering, Nanjing University of Posts and Telecommunications, Nanjing 210003, China
2College of Automation Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China

Received 17 July 2014; Revised 19 October 2014; Accepted 20 October 2014; Published 2 November 2014

Academic Editor: Ebrahim Momoniat

Copyright © 2014 Yan Yang et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

A Bearingless Switched Reluctance Motor (BSRM) has a complicated character of nonlinear coupling; therefore, it is a hard work to operate BSRM stably. In this paper, a new type of BSRMs with novel rotor structure is proposed by analyzing relationships between motor structure and theoretical formulae of levitation force and torque. The stator structure of this new motor is same as that of traditional BSRM and each stator pole can coil one winding or two windings, while the pole arc of rotor is wider. In order to analyze the characteristics of the proposed BSRM, finite-element (FE) models are used and a 12/4 one-set-winding BSRM and a 12/8 two-sets-windings BSRM are taken as examples. The analysis results indicate that the new scheme is effective for a stable levitation. It can realize decoupling control of torque and radial force, thus simplifying its control strategy and improving the use ratio of winding currents. A control system is designed for the 12/8 BSRM based on deducing its mathematical model. Compared with traditional BSRM, the proposed scheme is easier to be implemented.