Affiliations: [a] College of Automation Engineering, Nanjing University of Posts and Telecommunications, Nanjing 210023, Jiangsu, China | [b] College of Automation Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, Jiangsu, China
Correspondence:
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Corresponding author: Zeyuan Liu, College of Automation Engineering, Nanjing University of Posts and Telecommunications, Nanjing 210023, Jiangsu, China. Tel.: +86 25 8586 6511; Fax: +86 25 8565 6501; E-mail:liuzy@njupt.edu
Abstract: High-speed and high-power-density drives are receiving more and more
attention in today's industry. This study presents a switched reluctance
motor (SRM) with conical magnetic bearings (CMBs), which is very suitable to
operate in high speed and harsh environment such as starter/generator in
aircraft. The proposed motor consists of a SRM and two CMBs. There is
electric relationship between the SRM and two CMBs, this novel motor's
three-phase motoring windings are constructed by connecting each phase
biased winding of two CMBs and each phase winding of the SRM in series,
respectively, and the three-phase motoring windings are driven by the
traditional switched reluctance mode. Thus the rotational torque in SRM and
the biased flux used for suspending force generation in two CMBs can be
produced by motoring winding currents simultaneously. Initially, the
structure and working principle of the proposed SRM with CMBs are
demonstrated. Then, the theoretical formulas for computing the suspending
force of this novel CMB in the proposed structure are deduced by taking
advantage of the magnetic equivalent circuit method and the virtual
displacement principle. Furthermore, its suspending force control and basic
design method are described. Finally, the characteristics of the proposed
SRM with CMBs are deeply analyzed and verified by 3D finite element method.
Keywords: Conical magnetic bearing, switched reluctance motor, magnetic suspension
