Abstract
This work introduces a novel bearingless slice motor design: the bearingless flux-switching slice motor. In contrast to state-of-the-art bearingless slice motors, the rotor in this new design does not include any permanent rotor magnets. This offers advantages for disposable devices, such as those used in the medical industry, and extends the range of bearingless slice motors toward high-temperature applications. In this study, our focus is on the analytical modeling of the suspension force torque generation of a single coil and the bearingless motor. We assessed motor performance in relation to motor topology by applying performance factors. A prototype motor was optimized, designed, and manufactured. We also presented the state-of-the-art nonlinear feedback control scheme used. The motor was operated, and both static and dynamic measurements were taken on a test bench, thus successfully demonstrating the functionality and applicability of the novel bearingless slice motor concept.
Highlights
A disk-shaped rotor inside a permanent magnetic biased air gap field allows three degrees of freedom to be stabilized passively by reluctance forces.Active control of the remaining three degrees of freedom is achieved by the stator coils and leads to a very compact, fully magnetically levitated drive
This paper focuses on the bearingless flux-switching motor, as it appears to be a promising approach for development of slice motor systems
The analytical model and the finite-element simulations consistently showed that there was a high quadratic term in the generation of the single-phase x-force. This term arose from a significant armature reaction, which is typically small in systems where the current flux has to penetrate a permanent magnet
Summary
A disk-shaped rotor inside a permanent magnetic biased air gap field allows three degrees of freedom (two tilting directions and axial displacement) to be stabilized passively by reluctance forces. Active control of the remaining three degrees of freedom (radial movement and rotation) is achieved by the stator coils and leads to a very compact, fully magnetically levitated drive Such systems are called bearingless slice motors, and were first introduced in 1994 [1]. Results showed that force generation was comparable with standard slice motor systems, but that torque generation was reduced by principle, as the permanent magnetic field and flux linkage only varies but does not change its direction. This article is loosely based on a conference paper [15], but has been extended significantly throughout and includes new research results It is organized as follows: Section 2 describes the structural design of the bearingless flux-switching motor.
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