Journal ArticleDOI
On the High Speed Capacity of Bearingless Drives
TLDR
The criteria for high speed operation and the ability of this topology to fulfill them are discussed and a description of a prototype system, designed to reach speeds of beyond 100 000 r/min are given.Abstract:
With soaring raw material costs, the need for smaller drives running at higher speeds is ever increasing. In parallel, magnetic bearings and bearingless drives have outgrown the purely academic level and are the state of the art solution for several industrial processes. All the bearingless drives in industry and most of them in academic research run at relatively low speeds of up to 15 000 r/min. Thus, the suitability for high speed operation remained unclear. Along with a brief introduction to bearingless drives, the criteria for high speed operation and the ability of this topology to fulfill them is discussed in the first part. The second part gives a description of a prototype system, designed to reach speeds of beyond 100 000 r/min. The last section shows the experimental results of the prototype concerning the operational behavior.read more
Citations
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Journal ArticleDOI
Multiobjective Optimization of a Combined Radial-Axial Magnetic Bearing for Magnetically Suspended Compressor
TL;DR: The design principle and initial model of CRAMB are introduced and the method of multiobjective optimization (MOO) on the bearing is proposed, which can balance these objectives compared with single-objectives optimization (SOO).
Journal ArticleDOI
Review of Bearingless Motor Technology for Significant Power Applications
TL;DR: This article derives sizing equations of different bearingless motor topologies, which are summarized as a design tool for developing industrial-scale Bearingless motor technology.
Journal ArticleDOI
Design of Dual Purpose No-Voltage Combined Windings for Bearingless Motors
TL;DR: In this article, a single motor winding is proposed to produce both radial force and torque, which can be used to transform conventional motor designs into bearingless motors by modifying the winding end connections.
Journal ArticleDOI
Comparison of High-Speed Bearingless Drive Topologies With Combined Windings
TL;DR: A comparison of the constructed and tested setup with the possible variations is presented and the ones which this paper focuses on are the variation of theNumber of phases, of the number of coils, and of the applied coil connection.
Journal ArticleDOI
Slotless Bearingless Disk Drive for High-Speed and High-Purity Applications
TL;DR: A bearingless drive for high-speed applications with high purity and special chemical demands is introduced and an advantageous winding system for independent force and torque generation is proposed, which can be realized with standard inverter technology.
References
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Book
Magnetic Bearings and Bearingless Drives
Akira Chiba,Tadashi Fukao,Osamu Ichikawa,Masahide Oshima,Masatsugu Takemoto,David G. Dorrell +5 more
TL;DR: The application of bearingless drives is emerging as an important technique in the areas of high-speed machinery and motion control, and a thorough grounding in the principles behind this cutting-edge technology is provided in this article.
Journal ArticleDOI
Fixation of buried and surface-mounted magnets in high-speed permanent-magnet synchronous machines
TL;DR: In this article, the authors present simple calculation strategies and discuss their limits for the mechanical design of high-speed machines with either surface mounted or buried magnets, and the results of the calculations are compared with FE-calculations.
Journal ArticleDOI
Potentials and limits of high speed PM motors
TL;DR: In this paper, the potentials and limits of high-speed permanent-magnet (PM) motors are discussed. And a criteria of optimisation of the motor structure is described, with the diameter ratio and the iron flux density as main design variables.
Journal ArticleDOI
Megaspeed Drive Systems: Pushing Beyond 1 Million r/min
TL;DR: In this paper, a review of the advantageous inverter topologies, taking into account the extremely low stator inductance and possible high-speed bearing types such as ball bearings, air bearings, foil bearings, and magnetic bearings, are given.