Title :
Mathematical Model of Radial Suspending Force for a New Stator-Permanent Magnet Bearingless Machine
Author :
Hongyun Jia ; Jianan Wang ; Ming Cheng ; Wei Hua ; Shumin Fei
Author_Institution :
Jiangsu CICAEET, Nanjing Univ. of Inf. Sci. & Technol., Nanjing, China
Abstract :
In this paper, a new stator-permanent magnet (PM) bearingless machine (SPMBM) is proposed. Its suspending windings, armature windings, and PMs are in the stator, while no PMs or windings are in the rotor. However, it is the focus in establishing an accurate mathematical model of radial suspension force to levitate the rotor stably by directly and effectively controlling the rotor eccentric displacement. First, operating principle and air-gap flux density distributions of the SPMBM are analyzed in detail. Then, an accurate mathematical model of radial suspension force is deduced by the Maxwell stress tensor method, and it is verified by the 2-D finite-element method (FEM). Results are consistent both by the radial suspension force mathematical models of the SPMBM and FEM.
Keywords :
Maxwell equations; air gaps; displacement control; finite element analysis; force control; machine control; magnetic flux; permanent magnet machines; suspensions (mechanical components); tensors; 2D finite-element method; FEM; Maxwell stress tensor method; PM SPMBM; air-gap flux density distributions; armature windings; operating principle; radial suspension force deduction; radial suspension force mathematical models; rotor eccentric displacement control; rotor stability levitation; stator-permanent magnet bearingless machine; suspending windings; Force; Mathematical model; Rotors; Stator windings; Suspensions; Windings; Bearingless machine; Stator-PM; bearingless machine; finite element method; finite-element method (FEM); mathematical model; radial suspension force; stator-permanent magnet (PM);
Journal_Title :
Magnetics, IEEE Transactions on
DOI :
10.1109/TMAG.2015.2439960
