A Fully Levitated Cone-Shaped Lorentz-Type Self-Bearing Machine With Skewed Windings

被引：11

作者：

Abrahamsson, Johan ^{[1
]}

Ogren, Jim ^{[1
]}

Hedlund, Magnus ^{[1
]}

机构：

[1] Uppsala Univ, Dept Engn Sci, Angstrom Lab, S-75121 Uppsala, Sweden

来源：

IEEE TRANSACTIONS ON MAGNETICS | 2014年 / 50卷 / 09期

关键词：

Bearings; energy storage; flywheel; magnetic;

D O I：

10.1109/TMAG.2014.2321104

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

0808 ; 0809 ;

摘要：

Brushless dc coreless electric machines with double-rotor and single-stator configuration have very low losses, since the return path of the magnetic flux rotates with the permanent magnets. The eddy-current loss in the stator is additionally very small due to the lack of iron, making it ideal for kinetic energy storage. This paper presents a design for self-bearing rotor suspension, achieved by placing the stator windings skewed on a conical surface. A mathematical analysis of the force from a skewed winding confined to the surface of a cone was found. The parametric analytical expressions of the magnitude and direction of force and torque were verified by finite-element method simulations for one specific geometry. A dynamic model using proportional-integral-differential control was implemented in MATLAB/Simulink, and the currents needed for the self-bearing effect were found by solving an underdetermined system of linear equations. External forces, calculated from acceleration measurements from a bus in urban traffic, were added to simulate the dynamic environment of an electrical vehicle.

引用

页数：9

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